author | jjh |
Wed, 13 Apr 2011 12:16:13 -0700 | |
changeset 9266 | 121fb370f179 |
parent 5506 | 202f599c92aa |
child 14342 | 8435a30053c1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2006, 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 com.sun.jdi; |
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import java.util.List; |
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import java.util.Map; |
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/** |
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* An object that currently exists in the target VM. An ObjectReference |
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* mirrors only the object itself and is not specific to any |
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* {@link Field} or {@link LocalVariable} to which it is currently |
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* assigned. An ObjectReference can |
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* have 0 or more references from field(s) and/or variable(s). |
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* <p> |
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* Any method on <code>ObjectReference</code> which directly or |
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* indirectly takes <code>ObjectReference</code> as an parameter may throw |
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* {@link com.sun.jdi.VMDisconnectedException} if the target VM is |
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* disconnected and the {@link com.sun.jdi.event.VMDisconnectEvent} has been or is |
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* available to be read from the {@link com.sun.jdi.event.EventQueue}. |
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* <p> |
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* Any method on <code>ObjectReference</code> which directly or |
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* indirectly takes <code>ObjectReference</code> as an parameter may throw |
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* {@link com.sun.jdi.VMOutOfMemoryException} if the target VM has run out of memory. |
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* <p> |
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* Any method on <code>ObjectReference</code> or which directly or indirectly takes |
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* <code>ObjectReference</code> as parameter may throw |
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* {@link com.sun.jdi.ObjectCollectedException} if the mirrored object has been |
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* garbage collected. |
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* |
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* @author Robert Field |
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* @author Gordon Hirsch |
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* @author James McIlree |
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* @since 1.3 |
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*/ |
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public interface ObjectReference extends Value |
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{ |
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/** |
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* Gets the {@link ReferenceType} that mirrors the type |
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* of this object. The type may be a subclass or implementor of the |
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* declared type of any field or variable which currently holds it. |
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* For example, right after the following statement. |
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* <p> |
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* <code>Object obj = new String("Hello, world!");</code> |
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* <p> |
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* The ReferenceType of obj will mirror java.lang.String and not |
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* java.lang.Object. |
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* <p> |
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* The type of an object never changes, so this method will |
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* always return the same ReferenceType over the lifetime of the |
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* mirrored object. |
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* <p> |
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* The returned ReferenceType will be a {@link ClassType} or |
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* {@link ArrayType} and never an {@link InterfaceType}. |
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* |
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* @return the {@link ReferenceType} for this object. |
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*/ |
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ReferenceType referenceType(); |
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/** |
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* Gets the value of a given instance or static field in this object. |
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* The Field must be valid for this ObjectReference; |
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* that is, it must be from |
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* the mirrored object's class or a superclass of that class. |
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* |
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* @param sig the field containing the requested value |
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* @return the {@link Value} of the instance field. |
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* @throws java.lang.IllegalArgumentException if the field is not valid for |
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* this object's class. |
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*/ |
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Value getValue(Field sig); |
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/** |
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* Gets the value of multiple instance and/or static fields in this object. |
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* The Fields must be valid for this ObjectReference; |
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* that is, they must be from |
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* the mirrored object's class or a superclass of that class. |
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* |
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* @param fields a list of {@link Field} objects containing the |
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* requested values. |
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* @return a Map of the requested {@link Field} objects with |
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* their {@link Value}. |
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* @throws java.lang.IllegalArgumentException if any field is not valid for |
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* this object's class. |
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*/ |
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Map<Field,Value> getValues(List<? extends Field> fields); |
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/** |
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* Sets the value of a given instance or static field in this object. |
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* The {@link Field} must be valid for this ObjectReference; that is, |
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* it must be from the mirrored object's class or a superclass of that class. |
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* If static, the field must not be final. |
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* <p> |
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* Object values must be assignment compatible with the field type |
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* (This implies that the field type must be loaded through the |
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* enclosing class's class loader). Primitive values must be |
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* either assignment compatible with the field type or must be |
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* convertible to the field type without loss of information. |
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* See section 5.2 of |
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* <cite>The Java™ Language Specification</cite> |
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* for more information on assignment |
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* compatibility. |
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* |
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* @param field the field containing the requested value |
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* @param value the new value to assign |
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* @throws java.lang.IllegalArgumentException if the field is not valid for |
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* this object's class. |
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* @throws InvalidTypeException if the value's type does not match |
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* the field's type. |
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* @throws ClassNotLoadedException if 'value' is not null, and the field |
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* type has not yet been loaded through the appropriate class loader. |
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}. |
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*/ |
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void setValue(Field field, Value value) |
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throws InvalidTypeException, ClassNotLoadedException; |
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/** Perform method invocation with only the invoking thread resumed */ |
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static final int INVOKE_SINGLE_THREADED = 0x1; |
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/** Perform non-virtual method invocation */ |
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static final int INVOKE_NONVIRTUAL = 0x2; |
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/** |
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* Invokes the specified {@link Method} on this object in the |
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* target VM. The |
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* specified method can be defined in this object's class, |
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* in a superclass of this object's class, or in an interface |
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* implemented by this object. The method may be a static method |
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* or an instance method, but not a static initializer or constructor. |
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* Use {@link ClassType#newInstance} to create a new object and |
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* run its constructor. |
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* <p> |
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* The method invocation will occur in the specified thread. |
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* Method invocation can occur only if the specified thread |
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* has been suspended by an event which occurred in that thread. |
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* Method invocation is not supported |
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* when the target VM has been suspended through |
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* {@link VirtualMachine#suspend} or when the specified thread |
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* is suspended through {@link ThreadReference#suspend}. |
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* <p> |
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* The specified method is invoked with the arguments in the specified |
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* argument list. The method invocation is synchronous; this method |
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* does not return until the invoked method returns in the target VM. |
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* If the invoked method throws an exception, this method |
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* will throw an {@link InvocationException} which contains |
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* a mirror to the exception object thrown. |
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* <p> |
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* Object arguments must be assignment compatible with the argument type |
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* (This implies that the argument type must be loaded through the |
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* enclosing class's class loader). Primitive arguments must be |
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* either assignment compatible with the argument type or must be |
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* convertible to the argument type without loss of information. |
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* If the method being called accepts a variable number of arguments, |
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* then the last argument type is an array of some component type. |
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* The argument in the matching position can be omitted, or can be null, |
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* an array of the same component type, or an argument of the |
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* component type followed by any number of other arguments of the same |
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* type. If the argument is omitted, then a 0 length array of the |
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* component type is passed. The component type can be a primitive type. |
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* Autoboxing is not supported. |
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* |
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* See section 5.2 of |
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* <cite>The Java™ Language Specification</cite> |
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* for more information on assignment compatibility. |
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* <p> |
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* By default, the method is invoked using dynamic lookup as |
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* documented in section 15.12.4.4 of |
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* <cite>The Java™ Language Specification</cite> |
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* in particular, overriding based on the runtime type of the object |
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* mirrored by this {@link ObjectReference} will occur. This |
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* behavior can be changed by specifying the |
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* {@link #INVOKE_NONVIRTUAL} bit flag in the <code>options</code> |
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* argument. If this flag is set, the specified method is invoked |
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* whether or not it is overridden for this object's runtime type. |
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* The method, in this case, must not belong to an interface and |
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* must not be abstract. This option is useful for performing method |
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* invocations like those done with the <code>super</code> keyword in |
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* the Java programming language. |
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* <p> |
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* By default, all threads in the target VM are resumed while |
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* the method is being invoked if they were previously |
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* suspended by an event or by {@link VirtualMachine#suspend} or |
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* {@link ThreadReference#suspend}. This is done to prevent the deadlocks |
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* that will occur if any of the threads own monitors |
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* that will be needed by the invoked method. |
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* Note, however, that this implicit resume acts exactly like |
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* {@link ThreadReference#resume}, so if the thread's suspend |
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* count is greater than 1, it will remain in a suspended state |
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* during the invocation and thus a deadlock could still occur. |
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* By default, when the invocation completes, |
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* all threads in the target VM are suspended, regardless their state |
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* before the invocation. |
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* It is possible that |
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* breakpoints or other events might occur during the invocation. |
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* This can cause deadlocks as described above. It can also cause a deadlock |
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* if invokeMethod is called from the client's event handler thread. In this |
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* case, this thread will be waiting for the invokeMethod to complete and |
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* won't read the EventSet that comes in for the new event. If this |
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* new EventSet is SUSPEND_ALL, then a deadlock will occur because no |
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* one will resume the EventSet. To avoid this, all EventRequests should |
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* be disabled before doing the invokeMethod, or the invokeMethod should |
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* not be done from the client's event handler thread. |
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* <p> |
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* The resumption of other threads during the invocation can be prevented |
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* by specifying the {@link #INVOKE_SINGLE_THREADED} |
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* bit flag in the <code>options</code> argument; however, |
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* there is no protection against or recovery from the deadlocks |
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* described above, so this option should be used with great caution. |
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* Only the specified thread will be resumed (as described for all |
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* threads above). Upon completion of a single threaded invoke, the invoking thread |
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* will be suspended once again. Note that any threads started during |
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* the single threaded invocation will not be suspended when the |
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* invocation completes. |
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* <p> |
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* If the target VM is disconnected during the invoke (for example, through |
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* {@link VirtualMachine#dispose}) the method invocation continues. |
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* |
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* @param thread the thread in which to invoke. |
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* @param method the {@link Method} to invoke. |
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* @param arguments the list of {@link Value} arguments bound to the |
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* invoked method. Values from the list are assigned to arguments |
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* in the order they appear in the method signature. |
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* @param options the integer bit flag options. |
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* @return a {@link Value} mirror of the invoked method's return value. |
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* @throws java.lang.IllegalArgumentException if the method is not |
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* a member of this object's class, if the size of the argument list |
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* does not match the number of declared arguemnts for the method, |
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* if the method is a constructor or static intializer, or |
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* if {@link #INVOKE_NONVIRTUAL} is specified and the method is |
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* either abstract or an interface member. |
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* @throws {@link InvalidTypeException} if any argument in the |
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* argument list is not assignable to the corresponding method argument |
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* type. |
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* @throws ClassNotLoadedException if any argument type has not yet been loaded |
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* through the appropriate class loader. |
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* @throws IncompatibleThreadStateException if the specified thread has not |
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* been suspended by an event. |
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* @throws InvocationException if the method invocation resulted in |
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* an exception in the target VM. |
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* @throws InvalidTypeException If the arguments do not meet this requirement -- |
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* Object arguments must be assignment compatible with the argument |
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* type. This implies that the argument type must be |
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* loaded through the enclosing class's class loader. |
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* Primitive arguments must be either assignment compatible with the |
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* argument type or must be convertible to the argument type without loss |
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* of information. See JLS section 5.2 for more information on assignment |
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* compatibility. |
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}. |
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*/ |
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Value invokeMethod(ThreadReference thread, Method method, |
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List<? extends Value> arguments, int options) |
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throws InvalidTypeException, |
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ClassNotLoadedException, |
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IncompatibleThreadStateException, |
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InvocationException; |
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/** |
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* Prevents garbage collection for this object. By default all |
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* {@link ObjectReference} values returned by JDI may be collected |
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* at any time the target VM is running. A call to this method |
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* guarantees that the object will not be collected. |
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* {@link #enableCollection} can be used to allow collection once |
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* again. |
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* <p> |
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* Calls to this method are counted. Every call to this method |
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* requires a corresponding call to {@link #enableCollection} before |
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* garbage collection is re-enabled. |
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* <p> |
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* Note that while the target VM is suspended, no garbage collection |
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* will occur because all threads are suspended. The typical |
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* examination of variables, fields, and arrays during the suspension |
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* is safe without explicitly disabling garbage collection. |
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* <p> |
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* This method should be used sparingly, as it alters the |
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* pattern of garbage collection in the target VM and, |
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* consequently, may result in application behavior under the |
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* debugger that differs from its non-debugged behavior. |
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only |
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* -see {@link VirtualMachine#canBeModified()}. |
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*/ |
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void disableCollection(); |
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/** |
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* Permits garbage collection for this object. By default all |
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* {@link ObjectReference} values returned by JDI may be collected |
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* at any time the target VM is running. A call to this method |
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* is necessary only if garbage collection was previously disabled |
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* with {@link #disableCollection}. |
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only |
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* -see {@link VirtualMachine#canBeModified()}. |
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*/ |
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void enableCollection(); |
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/** |
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* Determines if this object has been garbage collected in the target |
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* VM. |
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* |
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* @return <code>true</code> if this {@link ObjectReference} has been collected; |
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* <code>false</code> otherwise. |
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* @throws VMCannotBeModifiedException if the VirtualMachine is read-only |
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* -see {@link VirtualMachine#canBeModified()}. |
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*/ |
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boolean isCollected(); |
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/** |
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* Returns a unique identifier for this ObjectReference. |
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* It is guaranteed to be unique among all |
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* ObjectReferences from the same VM that have not yet been disposed. |
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* The guarantee applies as long |
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* as this ObjectReference has not yet been disposed. |
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* |
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* @return a long unique ID |
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*/ |
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long uniqueID(); |
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/** |
|
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* Returns a List containing a {@link ThreadReference} for |
|
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* each thread currently waiting for this object's monitor. |
|
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* See {@link ThreadReference#currentContendedMonitor} for |
|
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* information about when a thread is considered to be waiting |
|
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* for a monitor. |
|
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* <p> |
|
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* Not all target VMs support this operation. See |
|
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* VirtualMachine#canGetMonitorInfo to determine if the |
|
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* operation is supported. |
|
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* |
|
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* @return a List of {@link ThreadReference} objects. The list |
|
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* has zero length if no threads are waiting for the monitor. |
|
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* @throws java.lang.UnsupportedOperationException if the |
|
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* target VM does not support this operation. |
|
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* @throws IncompatibleThreadStateException if any |
|
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* waiting thread is not suspended |
|
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* in the target VM |
|
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*/ |
|
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List<ThreadReference> waitingThreads() |
|
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throws IncompatibleThreadStateException; |
|
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/** |
|
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* Returns an {@link ThreadReference} for the thread, if any, |
|
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* which currently owns this object's monitor. |
|
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* See {@link ThreadReference#ownedMonitors} for a definition |
|
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* of ownership. |
|
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* <p> |
|
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* Not all target VMs support this operation. See |
|
366 |
* VirtualMachine#canGetMonitorInfo to determine if the |
|
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* operation is supported. |
|
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* |
|
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* @return the {@link ThreadReference} which currently owns the |
|
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* monitor, or null if it is unowned. |
|
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* |
|
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* @throws java.lang.UnsupportedOperationException if the |
|
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* target VM does not support this operation. |
|
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* @throws IncompatibleThreadStateException if the owning thread is |
|
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* not suspended in the target VM |
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*/ |
|
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ThreadReference owningThread() throws IncompatibleThreadStateException; |
|
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||
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/** |
|
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* Returns the number times this object's monitor has been |
|
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* entered by the current owning thread. |
|
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* See {@link ThreadReference#ownedMonitors} for a definition |
|
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* of ownership. |
|
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* <p> |
|
385 |
* Not all target VMs support this operation. See |
|
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* VirtualMachine#canGetMonitorInfo to determine if the |
|
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* operation is supported. |
|
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* |
|
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* @see #owningThread |
|
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* @return the integer count of the number of entries. |
|
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* |
|
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* @throws java.lang.UnsupportedOperationException if the |
|
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* target VM does not support this operation. |
|
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* @throws IncompatibleThreadStateException if the owning thread is |
|
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* not suspended in the target VM |
|
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*/ |
|
397 |
int entryCount() throws IncompatibleThreadStateException; |
|
398 |
||
399 |
/** |
|
400 |
* Returns objects that directly reference this object. |
|
401 |
* Only objects that are reachable for the purposes of garbage collection |
|
402 |
* are returned. Note that an object can also be referenced in other ways, |
|
403 |
* such as from a local variable in a stack frame, or from a JNI global |
|
404 |
* reference. Such non-object referrers are not returned by this method. |
|
405 |
* <p> |
|
406 |
* Not all target virtual machines support this operation. |
|
407 |
* Use {@link VirtualMachine#canGetInstanceInfo()} |
|
408 |
* to determine if the operation is supported. |
|
409 |
* |
|
410 |
* @see VirtualMachine#instanceCounts(List) |
|
411 |
* @see ReferenceType#instances(long) |
|
412 |
||
413 |
* @param maxReferrers The maximum number of referring objects to return. |
|
414 |
* Must be non-negative. If zero, all referring |
|
415 |
* objects are returned. |
|
416 |
* @return a of List of {@link ObjectReference} objects. If there are |
|
417 |
* no objects that reference this object, a zero-length list is returned.. |
|
418 |
* @throws java.lang.UnsupportedOperationException if |
|
419 |
* the target virtual machine does not support this |
|
420 |
* operation - see |
|
421 |
* {@link VirtualMachine#canGetInstanceInfo() canGetInstanceInfo()} |
|
422 |
* @throws java.lang.IllegalArgumentException if maxReferrers is less |
|
423 |
* than zero. |
|
424 |
* @since 1.6 |
|
425 |
*/ |
|
426 |
List<ObjectReference> referringObjects(long maxReferrers); |
|
427 |
||
428 |
||
429 |
/** |
|
430 |
* Compares the specified Object with this ObjectReference for equality. |
|
431 |
* |
|
432 |
* @return true if the Object is an ObjectReference, if the |
|
433 |
* ObjectReferences belong to the same VM, and if applying the |
|
434 |
* "==" operator on the mirrored objects in that VM evaluates to true. |
|
435 |
*/ |
|
436 |
boolean equals(Object obj); |
|
437 |
||
438 |
/** |
|
439 |
* Returns the hash code value for this ObjectReference. |
|
440 |
* |
|
441 |
* @return the integer hash code |
|
442 |
*/ |
|
443 |
int hashCode(); |
|
444 |
} |