Package org.springframework.scheduling.annotation

Class AsyncAnnotationBeanPostProcessor

java.lang.Object

org.springframework.aop.framework.ProxyConfig

org.springframework.aop.framework.ProxyProcessorSupport

org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor

org.springframework.aop.framework.autoproxy.AbstractBeanFactoryAwareAdvisingPostProcessor

org.springframework.scheduling.annotation.AsyncAnnotationBeanPostProcessor

All Implemented Interfaces:

Serializable, AopInfrastructureBean, Aware, BeanClassLoaderAware, BeanFactoryAware, BeanPostProcessor, InstantiationAwareBeanPostProcessor, SmartInstantiationAwareBeanPostProcessor, Ordered

public class AsyncAnnotationBeanPostProcessor
extends AbstractBeanFactoryAwareAdvisingPostProcessor

Bean post-processor that automatically applies asynchronous invocation behavior to any bean that carries the Async annotation at class or method-level by adding a corresponding AsyncAnnotationAdvisor to the exposed proxy (either an existing AOP proxy or a newly generated proxy that implements all the target's interfaces).

The TaskExecutor responsible for the asynchronous execution may be provided as well as the annotation type that indicates a method should be invoked asynchronously. If no annotation type is specified, this post- processor will detect both Spring's @Async annotation as well as the EJB 3.1 jakarta.ejb.Asynchronous annotation.

For methods having a void return type, any exception thrown during the asynchronous method invocation cannot be accessed by the caller. An AsyncUncaughtExceptionHandler can be specified to handle these cases.

Note: The underlying async advisor applies before existing advisors by default, in order to switch to async execution as early as possible in the invocation chain.

Since:

3.0

Author:

Mark Fisher, Juergen Hoeller, Stephane Nicoll

See Also:

• Async
• AsyncAnnotationAdvisor
• AbstractAdvisingBeanPostProcessor.setBeforeExistingAdvisors(boolean)
• ScheduledAnnotationBeanPostProcessor
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_TASK_EXECUTOR_BEAN_NAME	The default name of the TaskExecutor bean to pick up: "taskExecutor".
protected final Log	logger

Fields inherited from class org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor

advisor, beforeExistingAdvisors

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor	Description
AsyncAnnotationBeanPostProcessor()

Method Summary

Modifier and Type	Method	Description
void	configure(Supplier<Executor> executor, Supplier<AsyncUncaughtExceptionHandler> exceptionHandler)	Configure this post-processor with the given executor and exception handler suppliers, applying the corresponding default if a supplier is not resolvable.
void	setAsyncAnnotationType(Class<? extends Annotation> asyncAnnotationType)	Set the 'async' annotation type to be detected at either class or method level.
void	setBeanFactory(BeanFactory beanFactory)	Callback that supplies the owning factory to a bean instance.
void	setExceptionHandler(AsyncUncaughtExceptionHandler exceptionHandler)	Set the AsyncUncaughtExceptionHandler to use to handle uncaught exceptions thrown by asynchronous method executions.
void	setExecutor(Executor executor)	Set the Executor to use when invoking methods asynchronously.

Methods inherited from class org.springframework.aop.framework.autoproxy.AbstractBeanFactoryAwareAdvisingPostProcessor

isEligible, prepareProxyFactory

Methods inherited from class org.springframework.aop.framework.AbstractAdvisingBeanPostProcessor

customizeProxyFactory, determineBeanType, isEligible, postProcessAfterInitialization, setBeforeExistingAdvisors

Methods inherited from class org.springframework.aop.framework.ProxyProcessorSupport

evaluateProxyInterfaces, getOrder, getProxyClassLoader, isConfigurationCallbackInterface, isInternalLanguageInterface, setBeanClassLoader, setOrder, setProxyClassLoader

Methods inherited from class org.springframework.aop.framework.ProxyConfig

copyFrom, isExposeProxy, isFrozen, isOpaque, isOptimize, isProxyTargetClass, setExposeProxy, setFrozen, setOpaque, setOptimize, setProxyTargetClass, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.beans.factory.config.BeanPostProcessor

postProcessBeforeInitialization

Methods inherited from interface org.springframework.beans.factory.config.InstantiationAwareBeanPostProcessor

postProcessAfterInstantiation, postProcessBeforeInstantiation, postProcessProperties

Methods inherited from interface org.springframework.beans.factory.config.SmartInstantiationAwareBeanPostProcessor

determineCandidateConstructors, getEarlyBeanReference, predictBeanType

Field Details

DEFAULT_TASK_EXECUTOR_BEAN_NAME

public static final String DEFAULT_TASK_EXECUTOR_BEAN_NAME

The default name of the TaskExecutor bean to pick up: "taskExecutor".

Note that the initial lookup happens by type; this is just the fallback in case of multiple executor beans found in the context.

Since:

4.2

See Also:

• AsyncExecutionAspectSupport.DEFAULT_TASK_EXECUTOR_BEAN_NAME
• Constant Field Values

logger

protected final Log logger

Constructor Details

AsyncAnnotationBeanPostProcessor

public AsyncAnnotationBeanPostProcessor()

Method Details

configure

public void configure(@Nullable
 Supplier<Executor> executor,
 @Nullable
 Supplier<AsyncUncaughtExceptionHandler> exceptionHandler)

Configure this post-processor with the given executor and exception handler suppliers, applying the corresponding default if a supplier is not resolvable.

Since:

5.1

setExecutor

public void setExecutor(Executor executor)

Set the Executor to use when invoking methods asynchronously.

If not specified, default executor resolution will apply: searching for a unique TaskExecutor bean in the context, or for an Executor bean named "taskExecutor" otherwise. If neither of the two is resolvable, a local default executor will be created within the interceptor.

See Also:

• AsyncExecutionInterceptor.getDefaultExecutor(BeanFactory)
• DEFAULT_TASK_EXECUTOR_BEAN_NAME

setExceptionHandler

public void setExceptionHandler(AsyncUncaughtExceptionHandler exceptionHandler)

Set the AsyncUncaughtExceptionHandler to use to handle uncaught exceptions thrown by asynchronous method executions.

Since:

4.1

setAsyncAnnotationType

public void setAsyncAnnotationType(Class<? extends Annotation> asyncAnnotationType)

Set the 'async' annotation type to be detected at either class or method level. By default, both the Async annotation and the EJB 3.1 jakarta.ejb.Asynchronous annotation will be detected.

This setter property exists so that developers can provide their own (non-Spring-specific) annotation type to indicate that a method (or all methods of a given class) should be invoked asynchronously.

Parameters:

asyncAnnotationType - the desired annotation type

setBeanFactory

public void setBeanFactory(BeanFactory beanFactory)

Description copied from interface: BeanFactoryAware

Callback that supplies the owning factory to a bean instance.

Invoked after the population of normal bean properties but before an initialization callback such as InitializingBean.afterPropertiesSet() or a custom init-method.

Specified by:

setBeanFactory in interface BeanFactoryAware

Overrides:

setBeanFactory in class AbstractBeanFactoryAwareAdvisingPostProcessor

Parameters:

beanFactory - owning BeanFactory (never null). The bean can immediately call methods on the factory.

See Also:

• BeanInitializationException