author | plevart |
Mon, 11 Apr 2016 10:55:03 +0200 | |
changeset 36972 | 27147cde3256 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2016, 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. |
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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.util.Objects; |
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import java.util.function.BiFunction; |
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/** |
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* root-ClassLoaderValue. Each instance defines a separate namespace for |
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* associated values. |
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* <p> |
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* ClassLoaderValue allows associating a |
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* {@link #computeIfAbsent(ClassLoader, BiFunction) computed} non-null value with |
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* a {@code (ClassLoader, keys...)} tuple. The associated value, as well as the |
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* keys are strongly reachable from the associated ClassLoader so care should be |
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* taken to use such keys and values that only reference types resolvable from |
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* the associated ClassLoader. Failing that, ClassLoader leaks are inevitable. |
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* <p> |
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* Example usage: |
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* <pre>{@code |
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* // create a root instance which represents a namespace and declares the type of |
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* // associated values (Class instances in this example) |
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* static final ClassLoaderValue<Class<?>> proxyClasses = new ClassLoaderValue<>(); |
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* |
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* // create a compound key composed of a Module and a list of interfaces |
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* Module module = ...; |
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* List<Class<?>> interfaces = ...; |
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* ClassLoaderValue<Class<?>>.Sub<Module>.Sub<List<Class<?>>> key = |
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* proxyClasses.sub(module).sub(interfaces); |
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* |
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* // use the compound key together with ClassLoader to lazily associate |
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* // the value with tuple (loader, module, interfaces) and return it |
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* ClassLoader loader = ...; |
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* Class<?> proxyClass = key.computeIfAbsent(loader, (ld, ky) -> { |
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* List<Class<?>> intfcs = ky.key(); |
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* Module m = ky.parent().key(); |
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* Class<?> clazz = defineProxyClass(ld, m, intfcs); |
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* return clazz; |
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* }); |
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* }</pre> |
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* <p> |
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* {@code classLoaderValue.<operation>(classLoader, ...)} represents an operation |
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* to {@link #get}, {@link #putIfAbsent}, {@link #computeIfAbsent} or {@link #remove} |
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* a value associated with a (classLoader, classLoaderValue) tuple. ClassLoader |
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* instances and root-{@link ClassLoaderValue} instances are compared using |
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* identity equality while {@link Sub sub}-ClassLoaderValue instances define |
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* {@link #equals(Object) equality} in terms of equality of its |
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* {@link Sub#parent() parent} ClassLoaderValue and its |
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* {@link #key() key} component. |
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* |
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* @param <V> the type of value(s) associated with the root-ClassLoaderValue and |
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* all its {@link #sub(Object) descendants}. |
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* @author Peter Levart |
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* @since 9 |
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*/ |
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final class ClassLoaderValue<V> |
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extends AbstractClassLoaderValue<ClassLoaderValue<V>, V> { |
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/** |
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* Constructs new root-ClassLoaderValue representing its own namespace. |
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*/ |
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public ClassLoaderValue() {} |
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/** |
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* @return the key component of this root-ClassLoaderValue (itself). |
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*/ |
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@Override |
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public ClassLoaderValue<V> key() { |
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return this; |
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} |
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/** |
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* root-ClassLoaderValue can only be equal to itself and has no predecessors. |
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*/ |
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@Override |
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public boolean isEqualOrDescendantOf(AbstractClassLoaderValue<?, V> clv) { |
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return equals(Objects.requireNonNull(clv)); |
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} |
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} |