org.springframework.aop.interceptor

Class AsyncExecutionInterceptor

java.lang.Object

org.springframework.aop.interceptor.AsyncExecutionAspectSupport

org.springframework.aop.interceptor.AsyncExecutionInterceptor

All Implemented Interfaces:

Advice, Interceptor, MethodInterceptor, org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanFactoryAware, org.springframework.core.Ordered

public class AsyncExecutionInterceptor
extends AsyncExecutionAspectSupport
implements MethodInterceptor, org.springframework.core.Ordered

AOP Alliance MethodInterceptor that processes method invocations asynchronously, using a given AsyncTaskExecutor. Typically used with the org.springframework.scheduling.annotation.Async annotation.

In terms of target method signatures, any parameter types are supported. However, the return type is constrained to either void or java.util.concurrent.Future. In the latter case, the Future handle returned from the proxy will be an actual asynchronous Future that can be used to track the result of the asynchronous method execution. However, since the target method needs to implement the same signature, it will have to return a temporary Future handle that just passes the return value through (like Spring's org.springframework.scheduling.annotation.AsyncResult or EJB 3.1's javax.ejb.AsyncResult).

As of Spring 3.1.2 the AnnotationAsyncExecutionInterceptor subclass is preferred for use due to its support for executor qualification in conjunction with Spring's @Async annotation.

Since:

3.0

Author:

Juergen Hoeller, Chris Beams

See Also:

org.springframework.scheduling.annotation.Async, org.springframework.scheduling.annotation.AsyncAnnotationAdvisor, org.springframework.scheduling.annotation.AnnotationAsyncExecutionInterceptor

Field Summary

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor and Description
AsyncExecutionInterceptor(Executor defaultExecutor) Create a new AsyncExecutionInterceptor.

Method Summary

Methods

Modifier and Type	Method and Description
protected String	getExecutorQualifier(Method method) This implementation is a no-op for compatibility in Spring 3.1.2.
int	getOrder()
Object	invoke(MethodInvocation invocation) Intercept the given method invocation, submit the actual calling of the method to the correct task executor and return immediately to the caller.

Methods inherited from class org.springframework.aop.interceptor.AsyncExecutionAspectSupport

determineAsyncExecutor, setBeanFactory, setExecutor

Methods inherited from class java.lang.Object

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

Constructor Detail

AsyncExecutionInterceptor

public AsyncExecutionInterceptor(Executor defaultExecutor)

Create a new AsyncExecutionInterceptor.

Parameters:

defaultExecutor - the Executor (typically a Spring AsyncTaskExecutor or ExecutorService) to delegate to

Method Detail

invoke

public Object invoke(MethodInvocation invocation)
              throws Throwable

Intercept the given method invocation, submit the actual calling of the method to the correct task executor and return immediately to the caller.

Specified by:

invoke in interface MethodInterceptor

Parameters:

invocation - the method to intercept and make asynchronous

Returns:

Future if the original method returns Future; null otherwise.

Throws:

Throwable

getExecutorQualifier

protected String getExecutorQualifier(Method method)

This implementation is a no-op for compatibility in Spring 3.1.2. Subclasses may override to provide support for extracting qualifier information, e.g. via an annotation on the given method.

Specified by:

getExecutorQualifier in class AsyncExecutionAspectSupport

Parameters:

method - the method to inspect for executor qualifier metadata

Returns:

always null

Since:

3.1.2

See Also:

AsyncExecutionAspectSupport.determineAsyncExecutor(Method)

getOrder

public int getOrder()

Specified by:

getOrder in interface org.springframework.core.Ordered