net.bytebuddy.implementation

Class InvocationHandlerAdapter

java.lang.Object

net.bytebuddy.implementation.InvocationHandlerAdapter

All Implemented Interfaces:

Implementation

Direct Known Subclasses:

InvocationHandlerAdapter.ForInstanceDelegation, InvocationHandlerAdapter.ForStaticDelegation

public abstract class InvocationHandlerAdapter
extends Object
implements Implementation

An adapter for adapting an InvocationHandler. The adapter allows the invocation handler to also intercept method calls to non-interface methods.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static interface	InvocationHandlerAdapter.AssignerConfigurable Allows for the configuration of an Assigner of an InvocationHandlerAdapter.
protected static class	InvocationHandlerAdapter.ForInstanceDelegation An implementation of an InvocationHandlerAdapter that delegates method invocations to an adapter that is stored in an instance field.
protected static class	InvocationHandlerAdapter.ForStaticDelegation An implementation of an InvocationHandlerAdapter that delegates method invocations to an adapter that is stored in a static field.

Nested classes/interfaces inherited from interface net.bytebuddy.implementation.Implementation

Implementation.Compound, Implementation.Context, Implementation.Simple, Implementation.SpecialMethodInvocation, Implementation.Target

Field Summary

Fields

Modifier and Type	Field and Description
protected Assigner	assigner The assigner that is used for assigning the return invocation handler's return value to the intercepted method's return value.
protected boolean	cacheMethods Determines if the Method instances that are handed to the intercepted methods are cached in static fields.
protected String	fieldName The name of the field for storing an invocation handler.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	InvocationHandlerAdapter(String fieldName, boolean cacheMethods, Assigner assigner) Creates a new invocation handler for a given field.

Method Summary

Modifier and Type	Method and Description
protected ByteCodeAppender.Size	apply(org.objectweb.asm.MethodVisitor methodVisitor, Implementation.Context implementationContext, MethodDescription instrumentedMethod, TypeDescription instrumentedType, StackManipulation preparingManipulation) Applies an implementation that delegates to a invocation handler.
boolean	equals(Object other)
int	hashCode()
static InvocationHandlerAdapter	of(InvocationHandler invocationHandler) Creates an implementation for any instance of an InvocationHandler that delegates all method interceptions to the given instance which will be stored in a static field.
static InvocationHandlerAdapter	of(InvocationHandler invocationHandler, String fieldName) Creates an implementation for any instance of an InvocationHandler that delegates all method interceptions to the given instance which will be stored in a static field.
static InvocationHandlerAdapter	toInstanceField(String fieldName) Creates an implementation for any InvocationHandler that delegates all method interceptions to a public instance field with the given name.
abstract InvocationHandlerAdapter.AssignerConfigurable	withMethodCache() By default, any Method instance that is handed over to an InvocationHandler is created on each invocation of the method.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface net.bytebuddy.implementation.Implementation

appender, prepare

Field Detail

fieldName

protected final String fieldName

The name of the field for storing an invocation handler.

assigner

protected final Assigner assigner

The assigner that is used for assigning the return invocation handler's return value to the intercepted method's return value.

cacheMethods

protected final boolean cacheMethods

Determines if the Method instances that are handed to the intercepted methods are cached in static fields.

Constructor Detail

InvocationHandlerAdapter

protected InvocationHandlerAdapter(String fieldName,
                                   boolean cacheMethods,
                                   Assigner assigner)

Creates a new invocation handler for a given field.

Parameters:

fieldName - The name of the field.

cacheMethods - Determines if the Method instances that are handed to the intercepted methods are cached in static fields.

assigner - The assigner to apply when defining this implementation.

Method Detail

of

public static InvocationHandlerAdapter of(InvocationHandler invocationHandler)

Creates an implementation for any instance of an InvocationHandler that delegates all method interceptions to the given instance which will be stored in a static field.

Parameters:

invocationHandler - The invocation handler to which all method calls are delegated.

Returns:

An implementation that delegates all method interceptions to the given invocation handler.

of

public static InvocationHandlerAdapter of(InvocationHandler invocationHandler,
                                          String fieldName)

Creates an implementation for any instance of an InvocationHandler that delegates all method interceptions to the given instance which will be stored in a static field.

Parameters:

invocationHandler - The invocation handler to which all method calls are delegated.

fieldName - The name of the field.

Returns:

An implementation that delegates all method interceptions to the given invocation handler.

toInstanceField

public static InvocationHandlerAdapter toInstanceField(String fieldName)

Creates an implementation for any InvocationHandler that delegates all method interceptions to a public instance field with the given name. This field has to be set before any invocations are intercepted. Otherwise, a NullPointerException will be thrown.

Parameters:

fieldName - The name of the field.

Returns:

An implementation that delegates all method interceptions to an instance field of the given name.

withMethodCache

public abstract InvocationHandlerAdapter.AssignerConfigurable withMethodCache()

By default, any Method instance that is handed over to an InvocationHandler is created on each invocation of the method. Method look-ups are normally cached by its defining Class what makes a repeated look-up of a method little expensive. However, because Method instances are mutable by their AccessibleObject contact, any looked-up instance needs to be copied by its defining Class before exposing it. This can cause performance deficits when a method is for example called repeatedly in a loop. By enabling the method cache, this performance penalty can be avoided by caching a single Method instance for any intercepted method as a static field in the instrumented type.

Returns:

A similar invocation handler adapter which caches any Method instance in form of a static field.

apply

protected ByteCodeAppender.Size apply(org.objectweb.asm.MethodVisitor methodVisitor,
                                      Implementation.Context implementationContext,
                                      MethodDescription instrumentedMethod,
                                      TypeDescription instrumentedType,
                                      StackManipulation preparingManipulation)

Applies an implementation that delegates to a invocation handler.

Parameters:

methodVisitor - The method visitor for writing the byte code to.

implementationContext - The implementation context for the current implementation.

instrumentedMethod - The method that is instrumented.

instrumentedType - The type that is instrumented.

preparingManipulation - A stack manipulation that applies any preparation to the operand stack.

Returns:

The size of the applied assignment.

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object