org.springframework.aop.framework

Class ReflectiveMethodInvocation

java.lang.Object

org.springframework.aop.framework.ReflectiveMethodInvocation

All Implemented Interfaces:

Cloneable, Invocation, Joinpoint, MethodInvocation, ProxyMethodInvocation

public class ReflectiveMethodInvocation
extends Object
implements ProxyMethodInvocation, Cloneable

Spring's implementation of the AOP Alliance MethodInvocation interface, implementing the extended ProxyMethodInvocation interface.

Invokes the target object using reflection. Subclasses can override the invokeJoinpoint() method to change this behavior, so this is also a useful base class for more specialized MethodInvocation implementations.

It is possible to clone an invocation, to invoke proceed() repeatedly (once per clone), using the invocableClone() method. It is also possible to attach custom attributes to the invocation, using the setUserAttribute(java.lang.String, java.lang.Object) / getUserAttribute(java.lang.String) methods.

NOTE: This class is considered internal and should not be directly accessed. The sole reason for it being public is compatibility with existing framework integrations (e.g. Pitchfork). For any other purposes, use the ProxyMethodInvocation interface instead.

Author:

Rod Johnson, Juergen Hoeller, Adrian Colyer

See Also:

invokeJoinpoint(), proceed(), invocableClone(), setUserAttribute(java.lang.String, java.lang.Object), getUserAttribute(java.lang.String)

Field Summary

Fields

Modifier and Type	Field and Description
protected Object[]	arguments
protected List<?>	interceptorsAndDynamicMethodMatchers List of MethodInterceptor and InterceptorAndDynamicMethodMatcher that need dynamic checks.
protected Method	method
protected Object	proxy
protected Object	target

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ReflectiveMethodInvocation(Object proxy, Object target, Method method, Object[] arguments, Class<?> targetClass, List<Object> interceptorsAndDynamicMethodMatchers) Construct a new ReflectiveMethodInvocation with the given arguments.

Method Summary

Modifier and Type	Method and Description
Object[]	getArguments() Get the arguments as an array object.
Method	getMethod() Return the method invoked on the proxied interface.
Object	getProxy() Return the proxy that this method invocation was made through.
AccessibleObject	getStaticPart() Return the static part of this joinpoint.
Object	getThis() Return the object that holds the current joinpoint's static part.
Object	getUserAttribute(String key) Return the value of the specified user attribute.
Map<String,Object>	getUserAttributes() Return user attributes associated with this invocation.
MethodInvocation	invocableClone() This implementation returns a shallow copy of this invocation object, including an independent copy of the original arguments array.
MethodInvocation	invocableClone(Object... arguments) This implementation returns a shallow copy of this invocation object, using the given arguments array for the clone.
protected Object	invokeJoinpoint() Invoke the joinpoint using reflection.
Object	proceed() Proceed to the next interceptor in the chain.
void	setArguments(Object... arguments) Set the arguments to be used on subsequent invocations in the any advice in this chain.
void	setUserAttribute(String key, Object value) Add the specified user attribute with the given value to this invocation.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

proxy

protected final Object proxy

target

@Nullable
protected final Object target

method

protected final Method method

arguments

protected Object[] arguments

interceptorsAndDynamicMethodMatchers

protected final List<?> interceptorsAndDynamicMethodMatchers

List of MethodInterceptor and InterceptorAndDynamicMethodMatcher that need dynamic checks.

Constructor Detail

ReflectiveMethodInvocation

protected ReflectiveMethodInvocation(Object proxy,
                                     @Nullable
                                     Object target,
                                     Method method,
                                     @Nullable
                                     Object[] arguments,
                                     @Nullable
                                     Class<?> targetClass,
                                     List<Object> interceptorsAndDynamicMethodMatchers)

Construct a new ReflectiveMethodInvocation with the given arguments.

Parameters:

proxy - the proxy object that the invocation was made on

target - the target object to invoke

method - the method to invoke

arguments - the arguments to invoke the method with

targetClass - the target class, for MethodMatcher invocations

interceptorsAndDynamicMethodMatchers - interceptors that should be applied, along with any InterceptorAndDynamicMethodMatchers that need evaluation at runtime. MethodMatchers included in this struct must already have been found to have matched as far as was possibly statically. Passing an array might be about 10% faster, but would complicate the code. And it would work only for static pointcuts.

Method Detail

getProxy

public final Object getProxy()

Description copied from interface: ProxyMethodInvocation

Return the proxy that this method invocation was made through.

Specified by:

getProxy in interface ProxyMethodInvocation

Returns:

the original proxy object

getThis

@Nullable
public final Object getThis()

Description copied from interface: Joinpoint

Return the object that holds the current joinpoint's static part.

For instance, the target object for an invocation.

Specified by:

getThis in interface Joinpoint

Returns:

the object (can be null if the accessible object is static)

getStaticPart

public final AccessibleObject getStaticPart()

Description copied from interface: Joinpoint

Return the static part of this joinpoint.

The static part is an accessible object on which a chain of interceptors are installed.

Specified by:

getStaticPart in interface Joinpoint

getMethod

public final Method getMethod()

Return the method invoked on the proxied interface. May or may not correspond with a method invoked on an underlying implementation of that interface.

Specified by:

getMethod in interface MethodInvocation

Returns:

the method being called

getArguments

public final Object[] getArguments()

Description copied from interface: Invocation

Get the arguments as an array object. It is possible to change element values within this array to change the arguments.

Specified by:

getArguments in interface Invocation

Returns:

the argument of the invocation

setArguments

public void setArguments(Object... arguments)

Description copied from interface: ProxyMethodInvocation

Set the arguments to be used on subsequent invocations in the any advice in this chain.

Specified by:

setArguments in interface ProxyMethodInvocation

Parameters:

arguments - the argument array

proceed

@Nullable
public Object proceed()
                         throws Throwable

Description copied from interface: Joinpoint

Proceed to the next interceptor in the chain.

The implementation and the semantics of this method depends on the actual joinpoint type (see the children interfaces).

Specified by:

proceed in interface Joinpoint

Returns:

see the children interfaces' proceed definition

Throws:

Throwable - if the joinpoint throws an exception

invokeJoinpoint

@Nullable
protected Object invokeJoinpoint()
                                    throws Throwable

Invoke the joinpoint using reflection. Subclasses can override this to use custom invocation.

Returns:

the return value of the joinpoint

Throws:

Throwable - if invoking the joinpoint resulted in an exception

invocableClone

public MethodInvocation invocableClone()

This implementation returns a shallow copy of this invocation object, including an independent copy of the original arguments array.

We want a shallow copy in this case: We want to use the same interceptor chain and other object references, but we want an independent value for the current interceptor index.

Specified by:

invocableClone in interface ProxyMethodInvocation

Returns:

an invocable clone of this invocation. proceed() can be called once per clone.

See Also:

Object.clone()

invocableClone

public MethodInvocation invocableClone(Object... arguments)

This implementation returns a shallow copy of this invocation object, using the given arguments array for the clone.

We want a shallow copy in this case: We want to use the same interceptor chain and other object references, but we want an independent value for the current interceptor index.

Specified by:

invocableClone in interface ProxyMethodInvocation

Parameters:

arguments - the arguments that the cloned invocation is supposed to use, overriding the original arguments

Returns:

an invocable clone of this invocation. proceed() can be called once per clone.

See Also:

Object.clone()

setUserAttribute

public void setUserAttribute(String key,
                             @Nullable
                             Object value)

Description copied from interface: ProxyMethodInvocation

Add the specified user attribute with the given value to this invocation.

Such attributes are not used within the AOP framework itself. They are just kept as part of the invocation object, for use in special interceptors.

Specified by:

setUserAttribute in interface ProxyMethodInvocation

Parameters:

key - the name of the attribute

value - the value of the attribute, or null to reset it

getUserAttribute

@Nullable
public Object getUserAttribute(String key)

Description copied from interface: ProxyMethodInvocation

Return the value of the specified user attribute.

Specified by:

getUserAttribute in interface ProxyMethodInvocation

Parameters:

key - the name of the attribute

Returns:

the value of the attribute, or null if not set

See Also:

ProxyMethodInvocation.setUserAttribute(java.lang.String, java.lang.Object)

getUserAttributes

public Map<String,Object> getUserAttributes()

Return user attributes associated with this invocation. This method provides an invocation-bound alternative to a ThreadLocal.

This map is initialized lazily and is not used in the AOP framework itself.

Returns:

any user attributes associated with this invocation (never null)

toString

public String toString()

Overrides:

toString in class Object