Package org.springframework.aop.interceptor

Class AsyncExecutionAspectSupport

java.lang.Object
org.springframework.aop.interceptor.AsyncExecutionAspectSupport
All Implemented Interfaces:
Aware, BeanFactoryAware
Direct Known Subclasses:
AsyncExecutionInterceptor
public abstract class AsyncExecutionAspectSupport extends Object implements BeanFactoryAware
Base class for asynchronous method execution aspects, such as org.springframework.scheduling.annotation.AnnotationAsyncExecutionInterceptor or org.springframework.scheduling.aspectj.AnnotationAsyncExecutionAspect.

Provides support for executor qualification on a method-by-method basis. AsyncExecutionAspectSupport objects must be constructed with a default Executor, but each individual method may further qualify a specific Executor bean to be used when executing it, for example, through an annotation attribute.

Since:
3.1.2
Author:
Chris Beams, Juergen Hoeller, Stephane Nicoll, He Bo, Sebastien Deleuze

  • 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:
      4.2.6
      See Also:

    • logger

      protected final Log logger

  • Constructor Details

    • AsyncExecutionAspectSupport

      public AsyncExecutionAspectSupport(@Nullable Executor defaultExecutor)
      Create a new instance with a default AsyncUncaughtExceptionHandler.
      Parameters:
      defaultExecutor - the Executor (typically a Spring AsyncTaskExecutor or ExecutorService) to delegate to, unless a more specific executor has been requested via a qualifier on the async method, in which case the executor will be looked up at invocation time against the enclosing bean factory

    • AsyncExecutionAspectSupport

      public AsyncExecutionAspectSupport(@Nullable Executor defaultExecutor, AsyncUncaughtExceptionHandler exceptionHandler)
      Create a new AsyncExecutionAspectSupport with the given exception handler.
      Parameters:
      defaultExecutor - the Executor (typically a Spring AsyncTaskExecutor or ExecutorService) to delegate to, unless a more specific executor has been requested via a qualifier on the async method, in which case the executor will be looked up at invocation time against the enclosing bean factory
      exceptionHandler - the AsyncUncaughtExceptionHandler to use

  • Method Details

    • configure

      public void configure(@Nullable Supplier<Executor> defaultExecutor, @Nullable Supplier<AsyncUncaughtExceptionHandler> exceptionHandler)
      Configure this aspect 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 defaultExecutor)
      Supply the executor to be used when executing async methods.
      Parameters:
      defaultExecutor - the Executor (typically a Spring AsyncTaskExecutor or ExecutorService) to delegate to, unless a more specific executor has been requested via a qualifier on the async method, in which case the executor will be looked up at invocation time against the enclosing bean factory
      See Also:

    • setExceptionHandler

      public void setExceptionHandler(AsyncUncaughtExceptionHandler exceptionHandler)
      Supply the AsyncUncaughtExceptionHandler to use to handle exceptions thrown by invoking asynchronous methods with a void return type.

    • setBeanFactory

      public void setBeanFactory(BeanFactory beanFactory)
      Set the BeanFactory to be used when looking up executors by qualifier or when relying on the default executor lookup algorithm.
      Specified by:
      setBeanFactory in interface BeanFactoryAware
      Parameters:
      beanFactory - owning BeanFactory (never null). The bean can immediately call methods on the factory.
      See Also:

    • determineAsyncExecutor

      @Nullable protected AsyncTaskExecutor determineAsyncExecutor(Method method)
      Determine the specific executor to use when executing the given method.
      Returns:
      the executor to use (or null, but just if no default executor is available)

    • getExecutorQualifier

      @Nullable protected abstract String getExecutorQualifier(Method method)
      Return the qualifier or bean name of the executor to be used when executing the given async method, typically specified in the form of an annotation attribute.

      Returning an empty string or null indicates that no specific executor has been specified and that the default executor should be used.

      Parameters:
      method - the method to inspect for executor qualifier metadata
      Returns:
      the qualifier if specified, otherwise empty String or null
      See Also:

    • findQualifiedExecutor

      @Nullable protected Executor findQualifiedExecutor(@Nullable BeanFactory beanFactory, String qualifier)
      Retrieve a target executor for the given qualifier.
      Parameters:
      qualifier - the qualifier to resolve
      Returns:
      the target executor, or null if none available
      Since:
      4.2.6
      See Also:

    • getDefaultExecutor

      @Nullable protected Executor getDefaultExecutor(@Nullable BeanFactory beanFactory)
      Retrieve or build a default executor for this advice instance.

      An executor returned from here will be cached for further use.

      The default implementation searches for a unique TaskExecutor bean in the context, or for an Executor bean named "taskExecutor" otherwise. If neither of the two is resolvable, this implementation will return null.

      Parameters:
      beanFactory - the BeanFactory to use for a default executor lookup
      Returns:
      the default executor, or null if none available
      Since:
      4.2.6
      See Also:

    • doSubmit

      @Nullable protected Object doSubmit(Callable<Object> task, AsyncTaskExecutor executor, Class<?> returnType)
      Delegate for actually executing the given task with the chosen executor.
      Parameters:
      task - the task to execute
      executor - the chosen executor
      returnType - the declared return type (potentially a Future variant)
      Returns:
      the execution result (potentially a corresponding Future handle)

    • handleError

      protected void handleError(Throwable ex, Method method, Object... params) throws Exception
      Handles a fatal error thrown while asynchronously invoking the specified Method.

      If the return type of the method is a Future object, the original exception can be propagated by just throwing it at the higher level. However, for all other cases, the exception will not be transmitted back to the client. In that later case, the current AsyncUncaughtExceptionHandler will be used to manage such exception.

      Parameters:
      ex - the exception to handle
      method - the method that was invoked
      params - the parameters used to invoke the method
      Throws:
      Exception