author | darcy |
Wed, 09 Oct 2019 10:17:50 -0700 | |
changeset 58520 | e036ee8bae56 |
parent 57956 | e0b8b019d2f5 |
child 58679 | 9c3209ff7550 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.lang.reflect; |
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import java.lang.module.ModuleDescriptor; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.HashSet; |
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import java.util.IdentityHashMap; |
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import java.util.List; |
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import java.util.Map; |
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import java.util.Objects; |
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import java.util.Set; |
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import java.util.concurrent.atomic.AtomicInteger; |
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import java.util.concurrent.atomic.AtomicLong; |
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import jdk.internal.access.JavaLangAccess; |
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import jdk.internal.access.SharedSecrets; |
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import jdk.internal.loader.BootLoader; |
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import jdk.internal.module.Modules; |
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import jdk.internal.misc.VM; |
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import jdk.internal.reflect.CallerSensitive; |
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import jdk.internal.reflect.Reflection; |
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import jdk.internal.loader.ClassLoaderValue; |
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import sun.reflect.misc.ReflectUtil; |
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import sun.security.action.GetBooleanAction; |
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import sun.security.action.GetPropertyAction; |
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import sun.security.util.SecurityConstants; |
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import static java.lang.module.ModuleDescriptor.Modifier.SYNTHETIC; |
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/** |
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* |
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* {@code Proxy} provides static methods for creating objects that act like instances |
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* of interfaces but allow for customized method invocation. |
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* To create a proxy instance for some interface {@code Foo}: |
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* <pre>{@code |
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* InvocationHandler handler = new MyInvocationHandler(...); |
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* Foo f = (Foo) Proxy.newProxyInstance(Foo.class.getClassLoader(), |
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* new Class<?>[] { Foo.class }, |
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* handler); |
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* }</pre> |
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* |
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* <p> |
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* A <em>proxy class</em> is a class created at runtime that implements a specified |
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* list of interfaces, known as <em>proxy interfaces</em>. A <em>proxy instance</em> |
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* is an instance of a proxy class. |
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* |
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* Each proxy instance has an associated <i>invocation handler</i> |
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* object, which implements the interface {@link InvocationHandler}. |
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* A method invocation on a proxy instance through one of its proxy |
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* interfaces will be dispatched to the {@link InvocationHandler#invoke |
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* invoke} method of the instance's invocation handler, passing the proxy |
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* instance, a {@code java.lang.reflect.Method} object identifying |
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* the method that was invoked, and an array of type {@code Object} |
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* containing the arguments. The invocation handler processes the |
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* encoded method invocation as appropriate and the result that it |
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* returns will be returned as the result of the method invocation on |
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* the proxy instance. |
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* |
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* <p>A proxy class has the following properties: |
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* |
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* <ul> |
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* <li>The unqualified name of a proxy class is unspecified. The space |
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* of class names that begin with the string {@code "$Proxy"} |
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* should be, however, reserved for proxy classes. |
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* |
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* <li>The package and module in which a proxy class is defined is specified |
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* <a href="#membership">below</a>. |
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* |
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* <li>A proxy class is <em>final and non-abstract</em>. |
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* |
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* <li>A proxy class extends {@code java.lang.reflect.Proxy}. |
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* |
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* <li>A proxy class implements exactly the interfaces specified at its |
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* creation, in the same order. Invoking {@link Class#getInterfaces() getInterfaces} |
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* on its {@code Class} object will return an array containing the same |
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* list of interfaces (in the order specified at its creation), invoking |
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* {@link Class#getMethods getMethods} on its {@code Class} object will return |
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* an array of {@code Method} objects that include all of the |
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* methods in those interfaces, and invoking {@code getMethod} will |
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* find methods in the proxy interfaces as would be expected. |
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* |
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* <li>The {@link java.security.ProtectionDomain} of a proxy class |
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* is the same as that of system classes loaded by the bootstrap class |
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* loader, such as {@code java.lang.Object}, because the code for a |
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* proxy class is generated by trusted system code. This protection |
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* domain will typically be granted {@code java.security.AllPermission}. |
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* |
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* <li>The {@link Proxy#isProxyClass Proxy.isProxyClass} method can be used |
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* to determine if a given class is a proxy class. |
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* </ul> |
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* |
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* <p>A proxy instance has the following properties: |
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* |
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* <ul> |
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* <li>Given a proxy instance {@code proxy} and one of the |
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* interfaces, {@code Foo}, implemented by its proxy class, the |
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* following expression will return true: |
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* <pre> |
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* {@code proxy instanceof Foo} |
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* </pre> |
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* and the following cast operation will succeed (rather than throwing |
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* a {@code ClassCastException}): |
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* <pre> |
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* {@code (Foo) proxy} |
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* </pre> |
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* |
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* <li>Each proxy instance has an associated invocation handler, the one |
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* that was passed to its constructor. The static |
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* {@link Proxy#getInvocationHandler Proxy.getInvocationHandler} method |
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* will return the invocation handler associated with the proxy instance |
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* passed as its argument. |
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* |
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* <li>An interface method invocation on a proxy instance will be |
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* encoded and dispatched to the invocation handler's {@link |
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* InvocationHandler#invoke invoke} method as described in the |
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* documentation for that method. |
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* |
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* <li>An invocation of the {@code hashCode}, |
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* {@code equals}, or {@code toString} methods declared in |
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* {@code java.lang.Object} on a proxy instance will be encoded and |
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* dispatched to the invocation handler's {@code invoke} method in |
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* the same manner as interface method invocations are encoded and |
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* dispatched, as described above. The declaring class of the |
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* {@code Method} object passed to {@code invoke} will be |
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* {@code java.lang.Object}. Other public methods of a proxy |
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* instance inherited from {@code java.lang.Object} are not |
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* overridden by a proxy class, so invocations of those methods behave |
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* like they do for instances of {@code java.lang.Object}. |
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* </ul> |
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* |
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* <h2><a id="membership">Package and Module Membership of Proxy Class</a></h2> |
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* |
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* The package and module to which a proxy class belongs are chosen such that |
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* the accessibility of the proxy class is in line with the accessibility of |
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* the proxy interfaces. Specifically, the package and the module membership |
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* of a proxy class defined via the |
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* {@link Proxy#getProxyClass(ClassLoader, Class[])} or |
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* {@link Proxy#newProxyInstance(ClassLoader, Class[], InvocationHandler)} |
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* methods is specified as follows: |
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* |
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* <ol> |
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* <li>If all the proxy interfaces are in <em>exported</em> or <em>open</em> |
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* packages: |
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* <ol type="a"> |
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* <li>if all the proxy interfaces are <em>public</em>, then the proxy class is |
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* <em>public</em> in a package exported by the |
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* {@linkplain ClassLoader#getUnnamedModule() unnamed module} of the specified |
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* loader. The name of the package is unspecified.</li> |
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* |
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* <li>if at least one of all the proxy interfaces is <em>non-public</em>, then |
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* the proxy class is <em>non-public</em> in the package and module of the |
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* non-public interfaces. All the non-public interfaces must be in the same |
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* package and module; otherwise, proxying them is |
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* <a href="#restrictions">not possible</a>.</li> |
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* </ol> |
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* </li> |
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* <li>If at least one proxy interface is in a package that is |
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* <em>non-exported</em> and <em>non-open</em>: |
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* <ol type="a"> |
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* <li>if all the proxy interfaces are <em>public</em>, then the proxy class is |
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* <em>public</em> in a <em>non-exported</em>, <em>non-open</em> package of |
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* <a href="#dynamicmodule"><em>dynamic module</em>.</a> |
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* The names of the package and the module are unspecified.</li> |
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* |
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* <li>if at least one of all the proxy interfaces is <em>non-public</em>, then |
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* the proxy class is <em>non-public</em> in the package and module of the |
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* non-public interfaces. All the non-public interfaces must be in the same |
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* package and module; otherwise, proxying them is |
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* <a href="#restrictions">not possible</a>.</li> |
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* </ol> |
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* </li> |
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* </ol> |
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* |
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* <p> |
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* Note that if proxy interfaces with a mix of accessibilities -- for example, |
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* an exported public interface and a non-exported non-public interface -- are |
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* proxied by the same instance, then the proxy class's accessibility is |
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* governed by the least accessible proxy interface. |
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* <p> |
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* Note that it is possible for arbitrary code to obtain access to a proxy class |
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* in an open package with {@link AccessibleObject#setAccessible setAccessible}, |
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* whereas a proxy class in a non-open package is never accessible to |
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* code outside the module of the proxy class. |
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* |
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* <p> |
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* Throughout this specification, a "non-exported package" refers to a package |
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* that is not exported to all modules, and a "non-open package" refers to |
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* a package that is not open to all modules. Specifically, these terms refer to |
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* a package that either is not exported/open by its containing module or is |
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* exported/open in a qualified fashion by its containing module. |
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* |
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* <h3><a id="dynamicmodule">Dynamic Modules</a></h3> |
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* <p> |
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* A dynamic module is a named module generated at runtime. A proxy class |
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* defined in a dynamic module is encapsulated and not accessible to any module. |
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* Calling {@link Constructor#newInstance(Object...)} on a proxy class in |
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* a dynamic module will throw {@code IllegalAccessException}; |
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* {@code Proxy.newProxyInstance} method should be used instead. |
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* |
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* <p> |
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* A dynamic module can read the modules of all of the superinterfaces of a proxy |
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* class and the modules of the types referenced by all public method signatures |
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* of a proxy class. If a superinterface or a referenced type, say {@code T}, |
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* is in a non-exported package, the {@linkplain Module module} of {@code T} is |
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* updated to export the package of {@code T} to the dynamic module. |
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* |
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* <h3>Methods Duplicated in Multiple Proxy Interfaces</h3> |
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* |
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* <p>When two or more proxy interfaces contain a method with |
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* the same name and parameter signature, the order of the proxy class's |
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* interfaces becomes significant. When such a <i>duplicate method</i> |
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* is invoked on a proxy instance, the {@code Method} object passed |
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* to the invocation handler will not necessarily be the one whose |
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* declaring class is assignable from the reference type of the interface |
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* that the proxy's method was invoked through. This limitation exists |
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* because the corresponding method implementation in the generated proxy |
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* class cannot determine which interface it was invoked through. |
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* Therefore, when a duplicate method is invoked on a proxy instance, |
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* the {@code Method} object for the method in the foremost interface |
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* that contains the method (either directly or inherited through a |
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* superinterface) in the proxy class's list of interfaces is passed to |
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* the invocation handler's {@code invoke} method, regardless of the |
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* reference type through which the method invocation occurred. |
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* |
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* <p>If a proxy interface contains a method with the same name and |
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* parameter signature as the {@code hashCode}, {@code equals}, |
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* or {@code toString} methods of {@code java.lang.Object}, |
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* when such a method is invoked on a proxy instance, the |
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* {@code Method} object passed to the invocation handler will have |
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* {@code java.lang.Object} as its declaring class. In other words, |
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* the public, non-final methods of {@code java.lang.Object} |
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* logically precede all of the proxy interfaces for the determination of |
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* which {@code Method} object to pass to the invocation handler. |
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* |
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* <p>Note also that when a duplicate method is dispatched to an |
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* invocation handler, the {@code invoke} method may only throw |
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* checked exception types that are assignable to one of the exception |
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* types in the {@code throws} clause of the method in <i>all</i> of |
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* the proxy interfaces that it can be invoked through. If the |
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* {@code invoke} method throws a checked exception that is not |
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* assignable to any of the exception types declared by the method in one |
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* of the proxy interfaces that it can be invoked through, then an |
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* unchecked {@code UndeclaredThrowableException} will be thrown by |
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* the invocation on the proxy instance. This restriction means that not |
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* all of the exception types returned by invoking |
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* {@code getExceptionTypes} on the {@code Method} object |
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* passed to the {@code invoke} method can necessarily be thrown |
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* successfully by the {@code invoke} method. |
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* |
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* @author Peter Jones |
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* @see InvocationHandler |
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* @since 1.3 |
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* @revised 9 |
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* @spec JPMS |
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*/ |
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public class Proxy implements java.io.Serializable { |
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@java.io.Serial |
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private static final long serialVersionUID = -2222568056686623797L; |
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/** parameter types of a proxy class constructor */ |
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private static final Class<?>[] constructorParams = |
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{ InvocationHandler.class }; |
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/** |
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* a cache of proxy constructors with |
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* {@link Constructor#setAccessible(boolean) accessible} flag already set |
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*/ |
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private static final ClassLoaderValue<Constructor<?>> proxyCache = |
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new ClassLoaderValue<>(); |
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|
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/** |
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* System property to revert to generation of proxy class files for version 1.5 (V49). |
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* Set to "true" to generate v49 class file format. |
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*/ |
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private static final boolean PROXY_GENERATOR_V49 = |
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GetBooleanAction.privilegedGetProperty("jdk.proxy.ProxyGenerator.v49"); |
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|
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/** |
2 | 308 |
* the invocation handler for this proxy instance. |
309 |
* @serial |
|
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*/ |
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@SuppressWarnings("serial") // Not statically typed as Serializable |
2 | 312 |
protected InvocationHandler h; |
313 |
||
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/** |
|
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* Prohibits instantiation. |
|
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*/ |
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private Proxy() { |
|
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} |
|
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||
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/** |
|
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* Constructs a new {@code Proxy} instance from a subclass |
|
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* (typically, a dynamic proxy class) with the specified value |
|
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* for its invocation handler. |
|
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* |
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* @param h the invocation handler for this proxy instance |
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* |
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* @throws NullPointerException if the given invocation handler, {@code h}, |
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* is {@code null}. |
2 | 329 |
*/ |
330 |
protected Proxy(InvocationHandler h) { |
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Objects.requireNonNull(h); |
2 | 332 |
this.h = h; |
333 |
} |
|
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/** |
|
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* Returns the {@code java.lang.Class} object for a proxy class |
|
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* given a class loader and an array of interfaces. The proxy class |
|
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* will be defined by the specified class loader and will implement |
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* all of the supplied interfaces. If any of the given interfaces |
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* is non-public, the proxy class will be non-public. If a proxy class |
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* for the same permutation of interfaces has already been defined by the |
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* class loader, then the existing proxy class will be returned; otherwise, |
2 | 343 |
* a proxy class for those interfaces will be generated dynamically |
344 |
* and defined by the class loader. |
|
345 |
* |
|
346 |
* @param loader the class loader to define the proxy class |
|
347 |
* @param interfaces the list of interfaces for the proxy class |
|
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* to implement |
|
349 |
* @return a proxy class that is defined in the specified class loader |
|
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* and that implements the specified interfaces |
|
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* @throws IllegalArgumentException if any of the <a href="#restrictions"> |
352 |
* restrictions</a> on the parameters are violated |
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* @throws SecurityException if a security manager, <em>s</em>, is present |
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* and any of the following conditions is met: |
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* <ul> |
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* <li> the given {@code loader} is {@code null} and |
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* the caller's class loader is not {@code null} and the |
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* invocation of {@link SecurityManager#checkPermission |
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* s.checkPermission} with |
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* {@code RuntimePermission("getClassLoader")} permission |
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* denies access.</li> |
20825 | 362 |
* <li> for each proxy interface, {@code intf}, |
363 |
* the caller's class loader is not the same as or an |
|
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* ancestor of the class loader for {@code intf} and |
|
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* invocation of {@link SecurityManager#checkPackageAccess |
20825 | 366 |
* s.checkPackageAccess()} denies access to {@code intf}.</li> |
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* </ul> |
2 | 368 |
* @throws NullPointerException if the {@code interfaces} array |
369 |
* argument or any of its elements are {@code null} |
|
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* |
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* @deprecated Proxy classes generated in a named module are encapsulated |
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* and not accessible to code outside its module. |
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* {@link Constructor#newInstance(Object...) Constructor.newInstance} |
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* will throw {@code IllegalAccessException} when it is called on |
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* an inaccessible proxy class. |
36511 | 376 |
* Use {@link #newProxyInstance(ClassLoader, Class[], InvocationHandler)} |
377 |
* to create a proxy instance instead. |
|
378 |
* |
|
379 |
* @see <a href="#membership">Package and Module Membership of Proxy Class</a> |
|
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* @revised 9 |
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* @spec JPMS |
2 | 382 |
*/ |
36511 | 383 |
@Deprecated |
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@CallerSensitive |
2 | 385 |
public static Class<?> getProxyClass(ClassLoader loader, |
386 |
Class<?>... interfaces) |
|
387 |
throws IllegalArgumentException |
|
388 |
{ |
|
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Class<?> caller = System.getSecurityManager() == null |
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390 |
? null |
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391 |
: Reflection.getCallerClass(); |
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392 |
|
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return getProxyConstructor(caller, loader, interfaces) |
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394 |
.getDeclaringClass(); |
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395 |
} |
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396 |
|
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/** |
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398 |
* Returns the {@code Constructor} object of a proxy class that takes a |
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* single argument of type {@link InvocationHandler}, given a class loader |
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* and an array of interfaces. The returned constructor will have the |
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* {@link Constructor#setAccessible(boolean) accessible} flag already set. |
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402 |
* |
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* @param caller passed from a public-facing @CallerSensitive method if |
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* SecurityManager is set or {@code null} if there's no |
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|
405 |
* SecurityManager |
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406 |
* @param loader the class loader to define the proxy class |
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407 |
* @param interfaces the list of interfaces for the proxy class |
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408 |
* to implement |
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409 |
* @return a Constructor of the proxy class taking single |
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|
410 |
* {@code InvocationHandler} parameter |
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|
411 |
*/ |
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412 |
private static Constructor<?> getProxyConstructor(Class<?> caller, |
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|
413 |
ClassLoader loader, |
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|
414 |
Class<?>... interfaces) |
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|
415 |
{ |
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|
416 |
// optimization for single interface |
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|
417 |
if (interfaces.length == 1) { |
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|
418 |
Class<?> intf = interfaces[0]; |
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|
419 |
if (caller != null) { |
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|
420 |
checkProxyAccess(caller, loader, intf); |
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|
421 |
} |
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|
422 |
return proxyCache.sub(intf).computeIfAbsent( |
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|
423 |
loader, |
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|
424 |
(ld, clv) -> new ProxyBuilder(ld, clv.key()).build() |
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|
425 |
); |
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|
426 |
} else { |
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|
427 |
// interfaces cloned |
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|
428 |
final Class<?>[] intfsArray = interfaces.clone(); |
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|
429 |
if (caller != null) { |
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|
430 |
checkProxyAccess(caller, loader, intfsArray); |
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|
431 |
} |
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432 |
final List<Class<?>> intfs = Arrays.asList(intfsArray); |
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|
433 |
return proxyCache.sub(intfs).computeIfAbsent( |
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|
434 |
loader, |
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|
435 |
(ld, clv) -> new ProxyBuilder(ld, clv.key()).build() |
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|
436 |
); |
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|
437 |
} |
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|
438 |
} |
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|
439 |
|
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440 |
/* |
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441 |
* Check permissions required to create a Proxy class. |
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442 |
* |
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443 |
* To define a proxy class, it performs the access checks as in |
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|
444 |
* Class.forName (VM will invoke ClassLoader.checkPackageAccess): |
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|
445 |
* 1. "getClassLoader" permission check if loader == null |
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|
446 |
* 2. checkPackageAccess on the interfaces it implements |
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|
447 |
* |
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448 |
* To get a constructor and new instance of a proxy class, it performs |
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|
449 |
* the package access check on the interfaces it implements |
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450 |
* as in Class.getConstructor. |
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451 |
* |
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* If an interface is non-public, the proxy class must be defined by |
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* the defining loader of the interface. If the caller's class loader |
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* is not the same as the defining loader of the interface, the VM |
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455 |
* will throw IllegalAccessError when the generated proxy class is |
36511 | 456 |
* being defined. |
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457 |
*/ |
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458 |
private static void checkProxyAccess(Class<?> caller, |
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diff
changeset
|
459 |
ClassLoader loader, |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
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|
460 |
Class<?> ... interfaces) |
16906
44dfee24cb71
8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents:
16108
diff
changeset
|
461 |
{ |
16087
89b565a23835
7197546: (proxy) Reflect about creating reflective proxies
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parents:
10419
diff
changeset
|
462 |
SecurityManager sm = System.getSecurityManager(); |
89b565a23835
7197546: (proxy) Reflect about creating reflective proxies
mchung
parents:
10419
diff
changeset
|
463 |
if (sm != null) { |
16906
44dfee24cb71
8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents:
16108
diff
changeset
|
464 |
ClassLoader ccl = caller.getClassLoader(); |
46047
97d615d81827
8161121: VM::isSystemDomainLoader should consider platform class loader
mchung
parents:
44844
diff
changeset
|
465 |
if (loader == null && ccl != null) { |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
466 |
sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); |
16906
44dfee24cb71
8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents:
16108
diff
changeset
|
467 |
} |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
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diff
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|
468 |
ReflectUtil.checkProxyPackageAccess(ccl, interfaces); |
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
469 |
} |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
470 |
} |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
471 |
|
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
472 |
/** |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
473 |
* Builder for a proxy class. |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
474 |
* |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
475 |
* If the module is not specified in this ProxyBuilder constructor, |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
476 |
* it will map from the given loader and interfaces to the module |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
477 |
* in which the proxy class will be defined. |
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
478 |
*/ |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
479 |
private static final class ProxyBuilder { |
52015
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
49529
diff
changeset
|
480 |
private static final JavaLangAccess JLA = SharedSecrets.getJavaLangAccess(); |
36511 | 481 |
|
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
482 |
// prefix for all proxy class names |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
483 |
private static final String proxyClassNamePrefix = "$Proxy"; |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
484 |
|
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
485 |
// next number to use for generation of unique proxy class names |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
486 |
private static final AtomicLong nextUniqueNumber = new AtomicLong(); |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
487 |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
488 |
// a reverse cache of defined proxy classes |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
489 |
private static final ClassLoaderValue<Boolean> reverseProxyCache = |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
490 |
new ClassLoaderValue<>(); |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
491 |
|
36511 | 492 |
private static Class<?> defineProxyClass(Module m, List<Class<?>> interfaces) { |
2 | 493 |
String proxyPkg = null; // package to define proxy class in |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
494 |
int accessFlags = Modifier.PUBLIC | Modifier.FINAL; |
2 | 495 |
|
496 |
/* |
|
497 |
* Record the package of a non-public proxy interface so that the |
|
498 |
* proxy class will be defined in the same package. Verify that |
|
499 |
* all non-public proxy interfaces are in the same package. |
|
500 |
*/ |
|
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
501 |
for (Class<?> intf : interfaces) { |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
502 |
int flags = intf.getModifiers(); |
2 | 503 |
if (!Modifier.isPublic(flags)) { |
36511 | 504 |
accessFlags = Modifier.FINAL; // non-public, final |
505 |
String pkg = intf.getPackageName(); |
|
2 | 506 |
if (proxyPkg == null) { |
507 |
proxyPkg = pkg; |
|
508 |
} else if (!pkg.equals(proxyPkg)) { |
|
509 |
throw new IllegalArgumentException( |
|
36511 | 510 |
"non-public interfaces from different packages"); |
2 | 511 |
} |
512 |
} |
|
513 |
} |
|
514 |
||
16087
89b565a23835
7197546: (proxy) Reflect about creating reflective proxies
mchung
parents:
10419
diff
changeset
|
515 |
if (proxyPkg == null) { |
36511 | 516 |
// all proxy interfaces are public |
517 |
proxyPkg = m.isNamed() ? PROXY_PACKAGE_PREFIX + "." + m.getName() |
|
518 |
: PROXY_PACKAGE_PREFIX; |
|
519 |
} else if (proxyPkg.isEmpty() && m.isNamed()) { |
|
520 |
throw new IllegalArgumentException( |
|
521 |
"Unnamed package cannot be added to " + m); |
|
522 |
} |
|
523 |
||
524 |
if (m.isNamed()) { |
|
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
525 |
if (!m.getDescriptor().packages().contains(proxyPkg)) { |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
526 |
throw new InternalError(proxyPkg + " not exist in " + m.getName()); |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
527 |
} |
2 | 528 |
} |
529 |
||
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
530 |
/* |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
531 |
* Choose a name for the proxy class to generate. |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
532 |
*/ |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
533 |
long num = nextUniqueNumber.getAndIncrement(); |
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
534 |
String proxyName = proxyPkg.isEmpty() |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
535 |
? proxyClassNamePrefix + num |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
536 |
: proxyPkg + "." + proxyClassNamePrefix + num; |
36511 | 537 |
|
538 |
ClassLoader loader = getLoader(m); |
|
539 |
trace(proxyName, m, loader, interfaces); |
|
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
540 |
|
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
541 |
/* |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
542 |
* Generate the specified proxy class. |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
543 |
*/ |
57827
425412369353
8207814: (proxy) upgrade the proxy class generator
rriggs
parents:
54206
diff
changeset
|
544 |
byte[] proxyClassFile = PROXY_GENERATOR_V49 |
425412369353
8207814: (proxy) upgrade the proxy class generator
rriggs
parents:
54206
diff
changeset
|
545 |
? ProxyGenerator_v49.generateProxyClass(proxyName, interfaces, accessFlags) |
425412369353
8207814: (proxy) upgrade the proxy class generator
rriggs
parents:
54206
diff
changeset
|
546 |
: ProxyGenerator.generateProxyClass(loader, proxyName, interfaces, accessFlags); |
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
547 |
try { |
52015
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
49529
diff
changeset
|
548 |
Class<?> pc = JLA.defineClass(loader, proxyName, proxyClassFile, |
821bfc24d750
8181443: Replace usages of jdk.internal.misc.Unsafe with MethodHandles.Lookup.defineClass
mchung
parents:
49529
diff
changeset
|
549 |
null, "__dynamic_proxy__"); |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
550 |
reverseProxyCache.sub(pc).putIfAbsent(loader, Boolean.TRUE); |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
551 |
return pc; |
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
552 |
} catch (ClassFormatError e) { |
2 | 553 |
/* |
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
554 |
* A ClassFormatError here means that (barring bugs in the |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
555 |
* proxy class generation code) there was some other |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
556 |
* invalid aspect of the arguments supplied to the proxy |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
557 |
* class creation (such as virtual machine limitations |
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
558 |
* exceeded). |
2 | 559 |
*/ |
17188
5e58e261911b
7123493: (proxy) Proxy.getProxyClass doesn't scale under high load
plevart
parents:
16923
diff
changeset
|
560 |
throw new IllegalArgumentException(e.toString()); |
2 | 561 |
} |
562 |
} |
|
36511 | 563 |
|
564 |
/** |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
565 |
* Test if given class is a class defined by |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
566 |
* {@link #defineProxyClass(Module, List)} |
36511 | 567 |
*/ |
568 |
static boolean isProxyClass(Class<?> c) { |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
569 |
return Objects.equals(reverseProxyCache.sub(c).get(c.getClassLoader()), |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
570 |
Boolean.TRUE); |
36511 | 571 |
} |
572 |
||
573 |
private static boolean isExportedType(Class<?> c) { |
|
574 |
String pn = c.getPackageName(); |
|
575 |
return Modifier.isPublic(c.getModifiers()) && c.getModule().isExported(pn); |
|
576 |
} |
|
577 |
||
578 |
private static boolean isPackagePrivateType(Class<?> c) { |
|
579 |
return !Modifier.isPublic(c.getModifiers()); |
|
580 |
} |
|
581 |
||
582 |
private static String toDetails(Class<?> c) { |
|
583 |
String access = "unknown"; |
|
584 |
if (isExportedType(c)) { |
|
585 |
access = "exported"; |
|
586 |
} else if (isPackagePrivateType(c)) { |
|
587 |
access = "package-private"; |
|
588 |
} else { |
|
589 |
access = "module-private"; |
|
590 |
} |
|
591 |
ClassLoader ld = c.getClassLoader(); |
|
592 |
return String.format(" %s/%s %s loader %s", |
|
593 |
c.getModule().getName(), c.getName(), access, ld); |
|
594 |
} |
|
595 |
||
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
596 |
static void trace(String cn, |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
597 |
Module module, |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
598 |
ClassLoader loader, |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
599 |
List<Class<?>> interfaces) { |
36511 | 600 |
if (isDebug()) { |
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
601 |
System.err.format("PROXY: %s/%s defined by %s%n", |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
602 |
module.getName(), cn, loader); |
36511 | 603 |
} |
604 |
if (isDebug("debug")) { |
|
49529
c0bdb1b1ab4f
8200127: Replace collection.stream().forEach() with collection.forEach()
martin
parents:
49273
diff
changeset
|
605 |
interfaces.forEach(c -> System.out.println(toDetails(c))); |
36511 | 606 |
} |
607 |
} |
|
608 |
||
609 |
private static final String DEBUG = |
|
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
610 |
GetPropertyAction.privilegedGetProperty("jdk.proxy.debug", ""); |
36511 | 611 |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
612 |
private static boolean isDebug() { |
36511 | 613 |
return !DEBUG.isEmpty(); |
614 |
} |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
615 |
private static boolean isDebug(String flag) { |
36511 | 616 |
return DEBUG.equals(flag); |
617 |
} |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
618 |
|
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
619 |
// ProxyBuilder instance members start here.... |
2 | 620 |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
621 |
private final List<Class<?>> interfaces; |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
622 |
private final Module module; |
36511 | 623 |
ProxyBuilder(ClassLoader loader, List<Class<?>> interfaces) { |
624 |
if (!VM.isModuleSystemInited()) { |
|
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
625 |
throw new InternalError("Proxy is not supported until " |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
626 |
+ "module system is fully initialized"); |
36511 | 627 |
} |
628 |
if (interfaces.size() > 65535) { |
|
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
629 |
throw new IllegalArgumentException("interface limit exceeded: " |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
630 |
+ interfaces.size()); |
36511 | 631 |
} |
632 |
||
633 |
Set<Class<?>> refTypes = referencedTypes(loader, interfaces); |
|
634 |
||
635 |
// IAE if violates any restrictions specified in newProxyInstance |
|
636 |
validateProxyInterfaces(loader, interfaces, refTypes); |
|
637 |
||
638 |
this.interfaces = interfaces; |
|
639 |
this.module = mapToModule(loader, interfaces, refTypes); |
|
640 |
assert getLoader(module) == loader; |
|
641 |
} |
|
642 |
||
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
643 |
ProxyBuilder(ClassLoader loader, Class<?> intf) { |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
644 |
this(loader, Collections.singletonList(intf)); |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
645 |
} |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
646 |
|
36511 | 647 |
/** |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
648 |
* Generate a proxy class and return its proxy Constructor with |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
649 |
* accessible flag already set. If the target module does not have access |
36511 | 650 |
* to any interface types, IllegalAccessError will be thrown by the VM |
651 |
* at defineClass time. |
|
652 |
* |
|
653 |
* Must call the checkProxyAccess method to perform permission checks |
|
654 |
* before calling this. |
|
655 |
*/ |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
656 |
Constructor<?> build() { |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
657 |
Class<?> proxyClass = defineProxyClass(module, interfaces); |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
658 |
final Constructor<?> cons; |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
659 |
try { |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
660 |
cons = proxyClass.getConstructor(constructorParams); |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
661 |
} catch (NoSuchMethodException e) { |
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|
662 |
throw new InternalError(e.toString(), e); |
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changeset
|
663 |
} |
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changeset
|
664 |
AccessController.doPrivileged(new PrivilegedAction<Void>() { |
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changeset
|
665 |
public Void run() { |
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changeset
|
666 |
cons.setAccessible(true); |
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changeset
|
667 |
return null; |
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changeset
|
668 |
} |
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changeset
|
669 |
}); |
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changeset
|
670 |
return cons; |
36511 | 671 |
} |
672 |
||
673 |
/** |
|
674 |
* Validate the given proxy interfaces and the given referenced types |
|
675 |
* are visible to the defining loader. |
|
676 |
* |
|
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|
677 |
* @throws IllegalArgumentException if it violates the restrictions |
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|
678 |
* specified in {@link Proxy#newProxyInstance} |
36511 | 679 |
*/ |
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|
680 |
private static void validateProxyInterfaces(ClassLoader loader, |
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|
681 |
List<Class<?>> interfaces, |
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changeset
|
682 |
Set<Class<?>> refTypes) |
36511 | 683 |
{ |
684 |
Map<Class<?>, Boolean> interfaceSet = new IdentityHashMap<>(interfaces.size()); |
|
685 |
for (Class<?> intf : interfaces) { |
|
686 |
/* |
|
687 |
* Verify that the class loader resolves the name of this |
|
688 |
* interface to the same Class object. |
|
689 |
*/ |
|
690 |
ensureVisible(loader, intf); |
|
691 |
||
692 |
/* |
|
693 |
* Verify that the Class object actually represents an |
|
694 |
* interface. |
|
695 |
*/ |
|
696 |
if (!intf.isInterface()) { |
|
697 |
throw new IllegalArgumentException(intf.getName() + " is not an interface"); |
|
698 |
} |
|
699 |
||
700 |
/* |
|
701 |
* Verify that this interface is not a duplicate. |
|
702 |
*/ |
|
703 |
if (interfaceSet.put(intf, Boolean.TRUE) != null) { |
|
704 |
throw new IllegalArgumentException("repeated interface: " + intf.getName()); |
|
705 |
} |
|
706 |
} |
|
707 |
||
708 |
for (Class<?> type : refTypes) { |
|
709 |
ensureVisible(loader, type); |
|
710 |
} |
|
711 |
} |
|
712 |
||
713 |
/* |
|
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|
714 |
* Returns all types referenced by all public non-static method signatures of |
36511 | 715 |
* the proxy interfaces |
716 |
*/ |
|
36972
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|
717 |
private static Set<Class<?>> referencedTypes(ClassLoader loader, |
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changeset
|
718 |
List<Class<?>> interfaces) { |
49273
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|
719 |
var types = new HashSet<Class<?>>(); |
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diff
changeset
|
720 |
for (var intf : interfaces) { |
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diff
changeset
|
721 |
for (Method m : intf.getMethods()) { |
af8ab4f90a32
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diff
changeset
|
722 |
if (!Modifier.isStatic(m.getModifiers())) { |
af8ab4f90a32
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changeset
|
723 |
addElementType(types, m.getReturnType()); |
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changeset
|
724 |
addElementTypes(types, m.getSharedParameterTypes()); |
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changeset
|
725 |
addElementTypes(types, m.getSharedExceptionTypes()); |
af8ab4f90a32
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diff
changeset
|
726 |
} |
af8ab4f90a32
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parents:
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diff
changeset
|
727 |
} |
af8ab4f90a32
8199862: Examine ProxyBuilder::referencedTypes startup cost
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parents:
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diff
changeset
|
728 |
} |
af8ab4f90a32
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parents:
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diff
changeset
|
729 |
return types; |
36511 | 730 |
} |
731 |
||
49273
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changeset
|
732 |
private static void addElementTypes(HashSet<Class<?>> types, |
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diff
changeset
|
733 |
Class<?> ... classes) { |
af8ab4f90a32
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parents:
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diff
changeset
|
734 |
for (var cls : classes) { |
af8ab4f90a32
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parents:
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diff
changeset
|
735 |
addElementType(types, cls); |
af8ab4f90a32
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parents:
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diff
changeset
|
736 |
} |
af8ab4f90a32
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parents:
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diff
changeset
|
737 |
} |
af8ab4f90a32
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parents:
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diff
changeset
|
738 |
|
af8ab4f90a32
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parents:
47722
diff
changeset
|
739 |
private static void addElementType(HashSet<Class<?>> types, |
af8ab4f90a32
8199862: Examine ProxyBuilder::referencedTypes startup cost
redestad
parents:
47722
diff
changeset
|
740 |
Class<?> cls) { |
af8ab4f90a32
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redestad
parents:
47722
diff
changeset
|
741 |
var type = getElementType(cls); |
af8ab4f90a32
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parents:
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diff
changeset
|
742 |
if (!type.isPrimitive()) { |
af8ab4f90a32
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redestad
parents:
47722
diff
changeset
|
743 |
types.add(type); |
af8ab4f90a32
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parents:
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diff
changeset
|
744 |
} |
36511 | 745 |
} |
746 |
||
747 |
/** |
|
748 |
* Returns the module that the generated proxy class belongs to. |
|
749 |
* |
|
750 |
* If all proxy interfaces are public and in exported packages, |
|
751 |
* then the proxy class is in unnamed module. |
|
752 |
* |
|
753 |
* If any of proxy interface is package-private, then the proxy class |
|
754 |
* is in the same module of the package-private interface. |
|
755 |
* |
|
756 |
* If all proxy interfaces are public and at least one in a non-exported |
|
44359
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diff
changeset
|
757 |
* package, then the proxy class is in a dynamic module in a |
c6761862ca0b
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diff
changeset
|
758 |
* non-exported package. Reads edge and qualified exports are added |
c6761862ca0b
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changeset
|
759 |
* for dynamic module to access. |
36511 | 760 |
*/ |
36972
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changeset
|
761 |
private static Module mapToModule(ClassLoader loader, |
27147cde3256
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parents:
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diff
changeset
|
762 |
List<Class<?>> interfaces, |
27147cde3256
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parents:
36669
diff
changeset
|
763 |
Set<Class<?>> refTypes) { |
36511 | 764 |
Map<Class<?>, Module> modulePrivateTypes = new HashMap<>(); |
765 |
Map<Class<?>, Module> packagePrivateTypes = new HashMap<>(); |
|
766 |
for (Class<?> intf : interfaces) { |
|
767 |
Module m = intf.getModule(); |
|
768 |
if (Modifier.isPublic(intf.getModifiers())) { |
|
769 |
// module-private types |
|
770 |
if (!m.isExported(intf.getPackageName())) { |
|
771 |
modulePrivateTypes.put(intf, m); |
|
772 |
} |
|
773 |
} else { |
|
774 |
packagePrivateTypes.put(intf, m); |
|
775 |
} |
|
776 |
} |
|
777 |
||
44359
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parents:
43712
diff
changeset
|
778 |
// all proxy interfaces are public and exported, the proxy class |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
779 |
// is in unnamed module. Such proxy class is accessible to |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
780 |
// any unnamed module and named module that can read unnamed module |
36511 | 781 |
if (packagePrivateTypes.isEmpty() && modulePrivateTypes.isEmpty()) { |
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
782 |
return loader != null ? loader.getUnnamedModule() |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
783 |
: BootLoader.getUnnamedModule(); |
36511 | 784 |
} |
785 |
||
786 |
if (packagePrivateTypes.size() > 0) { |
|
787 |
// all package-private types must be in the same runtime package |
|
788 |
// i.e. same package name and same module (named or unnamed) |
|
789 |
// |
|
790 |
// Configuration will fail if M1 and in M2 defined by the same loader |
|
791 |
// and both have the same package p (so no need to check class loader) |
|
792 |
if (packagePrivateTypes.size() > 1 && |
|
793 |
(packagePrivateTypes.keySet().stream() // more than one package |
|
794 |
.map(Class::getPackageName).distinct().count() > 1 || |
|
795 |
packagePrivateTypes.values().stream() // or more than one module |
|
796 |
.distinct().count() > 1)) { |
|
797 |
throw new IllegalArgumentException( |
|
798 |
"non-public interfaces from different packages"); |
|
799 |
} |
|
800 |
||
801 |
// all package-private types are in the same module (named or unnamed) |
|
802 |
Module target = null; |
|
803 |
for (Module m : packagePrivateTypes.values()) { |
|
804 |
if (getLoader(m) != loader) { |
|
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
805 |
// the specified loader is not the same class loader |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
806 |
// of the non-public interface |
36511 | 807 |
throw new IllegalArgumentException( |
808 |
"non-public interface is not defined by the given loader"); |
|
809 |
} |
|
810 |
target = m; |
|
811 |
} |
|
812 |
||
813 |
// validate if the target module can access all other interfaces |
|
814 |
for (Class<?> intf : interfaces) { |
|
815 |
Module m = intf.getModule(); |
|
816 |
if (m == target) continue; |
|
817 |
||
818 |
if (!target.canRead(m) || !m.isExported(intf.getPackageName(), target)) { |
|
819 |
throw new IllegalArgumentException(target + " can't access " + intf.getName()); |
|
820 |
} |
|
821 |
} |
|
822 |
||
823 |
// return the module of the package-private interface |
|
824 |
return target; |
|
825 |
} |
|
826 |
||
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
827 |
// All proxy interfaces are public and at least one in a non-exported |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
828 |
// package. So maps to a dynamic proxy module and add reads edge |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
829 |
// and qualified exports, if necessary |
36511 | 830 |
Module target = getDynamicModule(loader); |
831 |
||
37349
648609dc0f3d
8153895: (proxy) redundant read edges to superinterfaces of proxy interfaces
mchung
parents:
36972
diff
changeset
|
832 |
// set up proxy class access to proxy interfaces and types |
648609dc0f3d
8153895: (proxy) redundant read edges to superinterfaces of proxy interfaces
mchung
parents:
36972
diff
changeset
|
833 |
// referenced in the method signature |
648609dc0f3d
8153895: (proxy) redundant read edges to superinterfaces of proxy interfaces
mchung
parents:
36972
diff
changeset
|
834 |
Set<Class<?>> types = new HashSet<>(interfaces); |
648609dc0f3d
8153895: (proxy) redundant read edges to superinterfaces of proxy interfaces
mchung
parents:
36972
diff
changeset
|
835 |
types.addAll(refTypes); |
648609dc0f3d
8153895: (proxy) redundant read edges to superinterfaces of proxy interfaces
mchung
parents:
36972
diff
changeset
|
836 |
for (Class<?> c : types) { |
36511 | 837 |
ensureAccess(target, c); |
838 |
} |
|
839 |
return target; |
|
840 |
} |
|
841 |
||
842 |
/* |
|
843 |
* Ensure the given module can access the given class. |
|
844 |
*/ |
|
36972
27147cde3256
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parents:
36669
diff
changeset
|
845 |
private static void ensureAccess(Module target, Class<?> c) { |
36511 | 846 |
Module m = c.getModule(); |
847 |
// add read edge and qualified export for the target module to access |
|
848 |
if (!target.canRead(m)) { |
|
849 |
Modules.addReads(target, m); |
|
850 |
} |
|
851 |
String pn = c.getPackageName(); |
|
852 |
if (!m.isExported(pn, target)) { |
|
853 |
Modules.addExports(m, pn, target); |
|
854 |
} |
|
855 |
} |
|
856 |
||
857 |
/* |
|
858 |
* Ensure the given class is visible to the class loader. |
|
859 |
*/ |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
860 |
private static void ensureVisible(ClassLoader ld, Class<?> c) { |
36511 | 861 |
Class<?> type = null; |
862 |
try { |
|
863 |
type = Class.forName(c.getName(), false, ld); |
|
864 |
} catch (ClassNotFoundException e) { |
|
865 |
} |
|
866 |
if (type != c) { |
|
867 |
throw new IllegalArgumentException(c.getName() + |
|
868 |
" referenced from a method is not visible from class loader"); |
|
869 |
} |
|
870 |
} |
|
871 |
||
36972
27147cde3256
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plevart
parents:
36669
diff
changeset
|
872 |
private static Class<?> getElementType(Class<?> type) { |
36511 | 873 |
Class<?> e = type; |
874 |
while (e.isArray()) { |
|
875 |
e = e.getComponentType(); |
|
876 |
} |
|
877 |
return e; |
|
878 |
} |
|
879 |
||
36972
27147cde3256
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parents:
36669
diff
changeset
|
880 |
private static final ClassLoaderValue<Module> dynProxyModules = |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
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parents:
36669
diff
changeset
|
881 |
new ClassLoaderValue<>(); |
36511 | 882 |
private static final AtomicInteger counter = new AtomicInteger(); |
883 |
||
884 |
/* |
|
44359
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
885 |
* Define a dynamic module for the generated proxy classes in |
c6761862ca0b
8174823: Module system implementation refresh (3/2017)
alanb
parents:
43712
diff
changeset
|
886 |
* a non-exported package named com.sun.proxy.$MODULE. |
36511 | 887 |
* |
888 |
* Each class loader will have one dynamic module. |
|
889 |
*/ |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
890 |
private static Module getDynamicModule(ClassLoader loader) { |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
891 |
return dynProxyModules.computeIfAbsent(loader, (ld, clv) -> { |
36511 | 892 |
// create a dynamic module and setup module access |
893 |
String mn = "jdk.proxy" + counter.incrementAndGet(); |
|
894 |
String pn = PROXY_PACKAGE_PREFIX + "." + mn; |
|
43712
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
895 |
ModuleDescriptor descriptor = |
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
896 |
ModuleDescriptor.newModule(mn, Set.of(SYNTHETIC)) |
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
897 |
.packages(Set.of(pn)) |
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
898 |
.build(); |
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
899 |
Module m = Modules.defineModule(ld, descriptor, null); |
36511 | 900 |
Modules.addReads(m, Proxy.class.getModule()); |
901 |
// java.base to create proxy instance |
|
902 |
Modules.addExports(m, pn, Object.class.getModule()); |
|
903 |
return m; |
|
904 |
}); |
|
905 |
} |
|
906 |
} |
|
907 |
||
908 |
/** |
|
909 |
* Returns a proxy instance for the specified interfaces |
|
2 | 910 |
* that dispatches method invocations to the specified invocation |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
911 |
* handler. |
36511 | 912 |
* <p> |
44844
b2b4d98404ba
8179364: update "<a name=" in java.base module to use id attribute
jjg
parents:
44545
diff
changeset
|
913 |
* <a id="restrictions">{@code IllegalArgumentException} will be thrown |
36511 | 914 |
* if any of the following restrictions is violated:</a> |
915 |
* <ul> |
|
916 |
* <li>All of {@code Class} objects in the given {@code interfaces} array |
|
917 |
* must represent interfaces, not classes or primitive types. |
|
2 | 918 |
* |
36511 | 919 |
* <li>No two elements in the {@code interfaces} array may |
920 |
* refer to identical {@code Class} objects. |
|
921 |
* |
|
922 |
* <li>All of the interface types must be visible by name through the |
|
923 |
* specified class loader. In other words, for class loader |
|
924 |
* {@code cl} and every interface {@code i}, the following |
|
925 |
* expression must be true:<p> |
|
926 |
* {@code Class.forName(i.getName(), false, cl) == i} |
|
927 |
* |
|
928 |
* <li>All of the types referenced by all |
|
929 |
* public method signatures of the specified interfaces |
|
930 |
* and those inherited by their superinterfaces |
|
931 |
* must be visible by name through the specified class loader. |
|
932 |
* |
|
933 |
* <li>All non-public interfaces must be in the same package |
|
934 |
* and module, defined by the specified class loader and |
|
935 |
* the module of the non-public interfaces can access all of |
|
936 |
* the interface types; otherwise, it would not be possible for |
|
937 |
* the proxy class to implement all of the interfaces, |
|
938 |
* regardless of what package it is defined in. |
|
939 |
* |
|
940 |
* <li>For any set of member methods of the specified interfaces |
|
941 |
* that have the same signature: |
|
942 |
* <ul> |
|
943 |
* <li>If the return type of any of the methods is a primitive |
|
944 |
* type or void, then all of the methods must have that same |
|
945 |
* return type. |
|
946 |
* <li>Otherwise, one of the methods must have a return type that |
|
947 |
* is assignable to all of the return types of the rest of the |
|
948 |
* methods. |
|
949 |
* </ul> |
|
950 |
* |
|
951 |
* <li>The resulting proxy class must not exceed any limits imposed |
|
952 |
* on classes by the virtual machine. For example, the VM may limit |
|
953 |
* the number of interfaces that a class may implement to 65535; in |
|
954 |
* that case, the size of the {@code interfaces} array must not |
|
955 |
* exceed 65535. |
|
956 |
* </ul> |
|
957 |
* |
|
958 |
* <p>Note that the order of the specified proxy interfaces is |
|
959 |
* significant: two requests for a proxy class with the same combination |
|
960 |
* of interfaces but in a different order will result in two distinct |
|
961 |
* proxy classes. |
|
2 | 962 |
* |
963 |
* @param loader the class loader to define the proxy class |
|
964 |
* @param interfaces the list of interfaces for the proxy class |
|
965 |
* to implement |
|
966 |
* @param h the invocation handler to dispatch method invocations to |
|
967 |
* @return a proxy instance with the specified invocation handler of a |
|
968 |
* proxy class that is defined by the specified class loader |
|
969 |
* and that implements the specified interfaces |
|
36511 | 970 |
* @throws IllegalArgumentException if any of the <a href="#restrictions"> |
971 |
* restrictions</a> on the parameters are violated |
|
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
972 |
* @throws SecurityException if a security manager, <em>s</em>, is present |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
973 |
* and any of the following conditions is met: |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
974 |
* <ul> |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
975 |
* <li> the given {@code loader} is {@code null} and |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
976 |
* the caller's class loader is not {@code null} and the |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
977 |
* invocation of {@link SecurityManager#checkPermission |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
978 |
* s.checkPermission} with |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
979 |
* {@code RuntimePermission("getClassLoader")} permission |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
980 |
* denies access;</li> |
20825 | 981 |
* <li> for each proxy interface, {@code intf}, |
982 |
* the caller's class loader is not the same as or an |
|
983 |
* ancestor of the class loader for {@code intf} and |
|
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
984 |
* invocation of {@link SecurityManager#checkPackageAccess |
20825 | 985 |
* s.checkPackageAccess()} denies access to {@code intf};</li> |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
986 |
* <li> any of the given proxy interfaces is non-public and the |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
987 |
* caller class is not in the same {@linkplain Package runtime package} |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
988 |
* as the non-public interface and the invocation of |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
989 |
* {@link SecurityManager#checkPermission s.checkPermission} with |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
990 |
* {@code ReflectPermission("newProxyInPackage.{package name}")} |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
991 |
* permission denies access.</li> |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
992 |
* </ul> |
2 | 993 |
* @throws NullPointerException if the {@code interfaces} array |
994 |
* argument or any of its elements are {@code null}, or |
|
995 |
* if the invocation handler, {@code h}, is |
|
996 |
* {@code null} |
|
36511 | 997 |
* |
998 |
* @see <a href="#membership">Package and Module Membership of Proxy Class</a> |
|
43712
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
999 |
* @revised 9 |
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
1000 |
* @spec JPMS |
2 | 1001 |
*/ |
16906
44dfee24cb71
8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents:
16108
diff
changeset
|
1002 |
@CallerSensitive |
2 | 1003 |
public static Object newProxyInstance(ClassLoader loader, |
1004 |
Class<?>[] interfaces, |
|
36511 | 1005 |
InvocationHandler h) { |
17497
e65d73b7ae54
4487672: (proxy) Proxy constructor should check for null argument
mchung
parents:
17188
diff
changeset
|
1006 |
Objects.requireNonNull(h); |
2 | 1007 |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1008 |
final Class<?> caller = System.getSecurityManager() == null |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1009 |
? null |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1010 |
: Reflection.getCallerClass(); |
16906
44dfee24cb71
8010117: Annotate jdk caller sensitive methods with @sun.reflect.CallerSensitive
mchung
parents:
16108
diff
changeset
|
1011 |
|
2 | 1012 |
/* |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1013 |
* Look up or generate the designated proxy class and its constructor. |
2 | 1014 |
*/ |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1015 |
Constructor<?> cons = getProxyConstructor(caller, loader, interfaces); |
2 | 1016 |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1017 |
return newProxyInstance(caller, cons, h); |
36511 | 1018 |
} |
1019 |
||
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1020 |
private static Object newProxyInstance(Class<?> caller, // null if no SecurityManager |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1021 |
Constructor<?> cons, |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1022 |
InvocationHandler h) { |
2 | 1023 |
/* |
1024 |
* Invoke its constructor with the designated invocation handler. |
|
1025 |
*/ |
|
1026 |
try { |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1027 |
if (caller != null) { |
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1028 |
checkNewProxyPermission(caller, cons.getDeclaringClass()); |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1029 |
} |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1030 |
|
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1031 |
return cons.newInstance(new Object[]{h}); |
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1032 |
} catch (IllegalAccessException | InstantiationException e) { |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1033 |
throw new InternalError(e.toString(), e); |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1034 |
} catch (InvocationTargetException e) { |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1035 |
Throwable t = e.getCause(); |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1036 |
if (t instanceof RuntimeException) { |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1037 |
throw (RuntimeException) t; |
16087
89b565a23835
7197546: (proxy) Reflect about creating reflective proxies
mchung
parents:
10419
diff
changeset
|
1038 |
} else { |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1039 |
throw new InternalError(t.toString(), t); |
16087
89b565a23835
7197546: (proxy) Reflect about creating reflective proxies
mchung
parents:
10419
diff
changeset
|
1040 |
} |
2 | 1041 |
} |
1042 |
} |
|
1043 |
||
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1044 |
private static void checkNewProxyPermission(Class<?> caller, Class<?> proxyClass) { |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1045 |
SecurityManager sm = System.getSecurityManager(); |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1046 |
if (sm != null) { |
18244 | 1047 |
if (ReflectUtil.isNonPublicProxyClass(proxyClass)) { |
1048 |
ClassLoader ccl = caller.getClassLoader(); |
|
1049 |
ClassLoader pcl = proxyClass.getClassLoader(); |
|
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1050 |
|
18244 | 1051 |
// do permission check if the caller is in a different runtime package |
1052 |
// of the proxy class |
|
47722
ce6ff74192fc
8190733: Use Class::getPackageName in java.base implementation
mchung
parents:
47216
diff
changeset
|
1053 |
String pkg = proxyClass.getPackageName(); |
ce6ff74192fc
8190733: Use Class::getPackageName in java.base implementation
mchung
parents:
47216
diff
changeset
|
1054 |
String callerPkg = caller.getPackageName(); |
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1055 |
|
18244 | 1056 |
if (pcl != ccl || !pkg.equals(callerPkg)) { |
1057 |
sm.checkPermission(new ReflectPermission("newProxyInPackage." + pkg)); |
|
1058 |
} |
|
16923
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1059 |
} |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1060 |
} |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1061 |
} |
50bfa0defec2
8004260: dynamic proxy class should have the same Java language access as the proxy interfaces
mchung
parents:
16906
diff
changeset
|
1062 |
|
2 | 1063 |
/** |
36511 | 1064 |
* Returns the class loader for the given module. |
1065 |
*/ |
|
1066 |
private static ClassLoader getLoader(Module m) { |
|
1067 |
PrivilegedAction<ClassLoader> pa = m::getClassLoader; |
|
1068 |
return AccessController.doPrivileged(pa); |
|
1069 |
} |
|
1070 |
||
1071 |
/** |
|
1072 |
* Returns true if the given class is a proxy class. |
|
2 | 1073 |
* |
36511 | 1074 |
* @implNote The reliability of this method is important for the ability |
2 | 1075 |
* to use it to make security decisions, so its implementation should |
1076 |
* not just test if the class in question extends {@code Proxy}. |
|
1077 |
* |
|
1078 |
* @param cl the class to test |
|
1079 |
* @return {@code true} if the class is a proxy class and |
|
1080 |
* {@code false} otherwise |
|
1081 |
* @throws NullPointerException if {@code cl} is {@code null} |
|
43712
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
1082 |
* |
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
1083 |
* @revised 9 |
5dfd0950317c
8173393: Module system implementation refresh (2/2017)
alanb
parents:
41121
diff
changeset
|
1084 |
* @spec JPMS |
2 | 1085 |
*/ |
1086 |
public static boolean isProxyClass(Class<?> cl) { |
|
36972
27147cde3256
8152115: (proxy) Examine performance of dynamic proxy creation
plevart
parents:
36669
diff
changeset
|
1087 |
return Proxy.class.isAssignableFrom(cl) && ProxyBuilder.isProxyClass(cl); |
2 | 1088 |
} |
1089 |
||
1090 |
/** |
|
1091 |
* Returns the invocation handler for the specified proxy instance. |
|
1092 |
* |
|
1093 |
* @param proxy the proxy instance to return the invocation handler for |
|
1094 |
* @return the invocation handler for the proxy instance |
|
1095 |
* @throws IllegalArgumentException if the argument is not a |
|
1096 |
* proxy instance |
|
20825 | 1097 |
* @throws SecurityException if a security manager, <em>s</em>, is present |
1098 |
* and the caller's class loader is not the same as or an |
|
1099 |
* ancestor of the class loader for the invocation handler |
|
1100 |
* and invocation of {@link SecurityManager#checkPackageAccess |
|
1101 |
* s.checkPackageAccess()} denies access to the invocation |
|
1102 |
* handler's class. |
|
2 | 1103 |
*/ |
20825 | 1104 |
@CallerSensitive |
2 | 1105 |
public static InvocationHandler getInvocationHandler(Object proxy) |
1106 |
throws IllegalArgumentException |
|
1107 |
{ |
|
1108 |
/* |
|
1109 |
* Verify that the object is actually a proxy instance. |
|
1110 |
*/ |
|
1111 |
if (!isProxyClass(proxy.getClass())) { |
|
1112 |
throw new IllegalArgumentException("not a proxy instance"); |
|
1113 |
} |
|
1114 |
||
20825 | 1115 |
final Proxy p = (Proxy) proxy; |
1116 |
final InvocationHandler ih = p.h; |
|
1117 |
if (System.getSecurityManager() != null) { |
|
1118 |
Class<?> ihClass = ih.getClass(); |
|
1119 |
Class<?> caller = Reflection.getCallerClass(); |
|
1120 |
if (ReflectUtil.needsPackageAccessCheck(caller.getClassLoader(), |
|
1121 |
ihClass.getClassLoader())) |
|
1122 |
{ |
|
1123 |
ReflectUtil.checkPackageAccess(ihClass); |
|
1124 |
} |
|
1125 |
} |
|
1126 |
||
1127 |
return ih; |
|
2 | 1128 |
} |
1129 |
||
36511 | 1130 |
private static final String PROXY_PACKAGE_PREFIX = ReflectUtil.PROXY_PACKAGE; |
2 | 1131 |
} |