org.aopalliance.intercept

Interface Joinpoint

All Known Subinterfaces:

ConstructorInvocation, Invocation, MethodInvocation, ProxyMethodInvocation

All Known Implementing Classes:

ReflectiveMethodInvocation

public interface Joinpoint

This interface represents a generic runtime joinpoint (in the AOP terminology).

A runtime joinpoint is an event that occurs on a static joinpoint (i.e. a location in a the program). For instance, an invocation is the runtime joinpoint on a method (static joinpoint). The static part of a given joinpoint can be generically retrieved using the getStaticPart() method.

In the context of an interception framework, a runtime joinpoint is then the reification of an access to an accessible object (a method, a constructor, a field), i.e. the static part of the joinpoint. It is passed to the interceptors that are installed on the static joinpoint.

Author:

Rod Johnson

See Also:

Interceptor

Method Summary

Modifier and Type	Method and Description
java.lang.reflect.AccessibleObject	getStaticPart() Return the static part of this joinpoint.
java.lang.Object	getThis() Return the object that holds the current joinpoint's static part.
java.lang.Object	proceed() Proceed to the next interceptor in the chain.

Method Detail

proceed

java.lang.Object proceed()
                  throws java.lang.Throwable

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).

Returns:

see the children interfaces' proceed definition

Throws:

java.lang.Throwable - if the joinpoint throws an exception

getThis

java.lang.Object getThis()

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

For instance, the target object for an invocation.

Returns:

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

getStaticPart

java.lang.reflect.AccessibleObject getStaticPart()

Return the static part of this joinpoint.

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