java.lang.Object
- org.springframework.util.CustomizableThreadCreator
- - org.springframework.core.task.SimpleAsyncTaskExecutor

All Implemented Interfaces:
Serializable, Executor, AsyncListenableTaskExecutor, AsyncTaskExecutor, TaskExecutor
```
public class SimpleAsyncTaskExecutor
extends CustomizableThreadCreator
implements AsyncListenableTaskExecutor, Serializable
```
TaskExecutor implementation that fires up a new Thread for each task, executing it asynchronously.
Supports limiting concurrent threads through the "concurrencyLimit" bean property. By default, the number of concurrent threads is unlimited.
NOTE: This implementation does not reuse threads! Consider a thread-pooling TaskExecutor implementation instead, in particular for executing a large number of short-lived tasks.
Since:
2.0
Author:
Juergen Hoeller
See Also:
setConcurrencyLimit(int), SyncTaskExecutor, ThreadPoolTaskExecutor, WorkManagerTaskExecutor, Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`NO_CONCURRENCY`	Switch concurrency 'off': that is, don't allow any concurrent invocations.
`static int`	`UNBOUNDED_CONCURRENCY`	Permit any number of concurrent invocations: that is, don't throttle concurrency.

Fields inherited from interface org.springframework.core.task.AsyncTaskExecutor
TIMEOUT_IMMEDIATE, TIMEOUT_INDEFINITE

Constructor Summary

Constructors
Constructor	Description
`SimpleAsyncTaskExecutor()`	Create a new SimpleAsyncTaskExecutor with default thread name prefix.
`SimpleAsyncTaskExecutor(String threadNamePrefix)`	Create a new SimpleAsyncTaskExecutor with the given thread name prefix.
`SimpleAsyncTaskExecutor(ThreadFactory threadFactory)`	Create a new SimpleAsyncTaskExecutor with the given external thread factory.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`doExecute(Runnable task)`	Template method for the actual execution of a task.
`void`	`execute(Runnable task)`	Executes the given task, within a concurrency throttle if configured (through the superclass's settings).
`void`	`execute(Runnable task, long startTimeout)`	Executes the given task, within a concurrency throttle if configured (through the superclass's settings).
`int`	`getConcurrencyLimit()`	Return the maximum number of parallel accesses allowed.
`ThreadFactory`	`getThreadFactory()`	Return the external factory to use for creating new Threads, if any.
`boolean`	`isThrottleActive()`	Return whether this throttle is currently active.
`void`	`setConcurrencyLimit(int concurrencyLimit)`	Set the maximum number of parallel accesses allowed.
`void`	`setTaskDecorator(TaskDecorator taskDecorator)`	Specify a custom `TaskDecorator` to be applied to any `Runnable` about to be executed.
`void`	`setThreadFactory(ThreadFactory threadFactory)`	Specify an external factory to use for creating new Threads, instead of relying on the local properties of this executor.
`Future<?>`	`submit(Runnable task)`	Submit a Runnable task for execution, receiving a Future representing that task.
`<T> Future<T>`	`submit(Callable<T> task)`	Submit a Callable task for execution, receiving a Future representing that task.
`ListenableFuture<?>`	`submitListenable(Runnable task)`	Submit a `Runnable` task for execution, receiving a `ListenableFuture` representing that task.
`<T> ListenableFuture<T>`	`submitListenable(Callable<T> task)`	Submit a `Callable` task for execution, receiving a `ListenableFuture` representing that task.

Methods inherited from class org.springframework.util.CustomizableThreadCreator
createThread, getDefaultThreadNamePrefix, getThreadGroup, getThreadNamePrefix, getThreadPriority, isDaemon, nextThreadName, setDaemon, setThreadGroup, setThreadGroupName, setThreadNamePrefix, setThreadPriority

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - UNBOUNDED_CONCURRENCY
```
public static final int UNBOUNDED_CONCURRENCY
```
    Permit any number of concurrent invocations: that is, don't throttle concurrency.
    See Also:
    ConcurrencyThrottleSupport.UNBOUNDED_CONCURRENCY, Constant Field Values
  - NO_CONCURRENCY
```
public static final int NO_CONCURRENCY
```
    Switch concurrency 'off': that is, don't allow any concurrent invocations.
    See Also:
    ConcurrencyThrottleSupport.NO_CONCURRENCY, Constant Field Values
- Constructor Detail
  - SimpleAsyncTaskExecutor
```
public SimpleAsyncTaskExecutor()
```
    Create a new SimpleAsyncTaskExecutor with default thread name prefix.
  - SimpleAsyncTaskExecutor
```
public SimpleAsyncTaskExecutor(String threadNamePrefix)
```
    Create a new SimpleAsyncTaskExecutor with the given thread name prefix.
    Parameters:
    threadNamePrefix - the prefix to use for the names of newly created threads
  - SimpleAsyncTaskExecutor
```
public SimpleAsyncTaskExecutor(ThreadFactory threadFactory)
```
    Create a new SimpleAsyncTaskExecutor with the given external thread factory.
    Parameters:
    threadFactory - the factory to use for creating new Threads
- Method Detail
  - setThreadFactory
```
public void setThreadFactory(ThreadFactory threadFactory)
```
    Specify an external factory to use for creating new Threads, instead of relying on the local properties of this executor.
    You may specify an inner ThreadFactory bean or also a ThreadFactory reference obtained from JNDI (on a Java EE 6 server) or some other lookup mechanism.
    See Also:
    CustomizableThreadCreator.setThreadNamePrefix(java.lang.String), CustomizableThreadCreator.setThreadPriority(int)
  - getThreadFactory
```
public final ThreadFactory getThreadFactory()
```
    Return the external factory to use for creating new Threads, if any.
  - setTaskDecorator
```
public final void setTaskDecorator(TaskDecorator taskDecorator)
```
    Specify a custom TaskDecorator to be applied to any Runnable about to be executed.
    Note that such a decorator is not necessarily being applied to the user-supplied Runnable/Callable but rather to the actual execution callback (which may be a wrapper around the user-supplied task).
    The primary use case is to set some execution context around the task's invocation, or to provide some monitoring/statistics for task execution.
    NOTE: Exception handling in TaskDecorator implementations is limited to plain Runnable execution via execute calls. In case of #submit calls, the exposed Runnable will be a FutureTask which does not propagate any exceptions; you might have to cast it and call Future#get to evaluate exceptions.
    Since:
    4.3
  - setConcurrencyLimit
```
public void setConcurrencyLimit(int concurrencyLimit)
```
    Set the maximum number of parallel accesses allowed. -1 indicates no concurrency limit at all.
    In principle, this limit can be changed at runtime, although it is generally designed as a config time setting. NOTE: Do not switch between -1 and any concrete limit at runtime, as this will lead to inconsistent concurrency counts: A limit of -1 effectively turns off concurrency counting completely.
    See Also:
    UNBOUNDED_CONCURRENCY
  - getConcurrencyLimit
```
public final int getConcurrencyLimit()
```
    Return the maximum number of parallel accesses allowed.
  - isThrottleActive
```
public final boolean isThrottleActive()
```
    Return whether this throttle is currently active.
    Returns:
    true if the concurrency limit for this instance is active
    See Also:
    getConcurrencyLimit(), setConcurrencyLimit(int)
  - execute
```
public void execute(Runnable task)
```
    Executes the given task, within a concurrency throttle if configured (through the superclass's settings).
    Specified by:
    execute in interface Executor
    Specified by:
    execute in interface TaskExecutor
    Parameters:
    task - the Runnable to execute (never null)
    See Also:
    doExecute(Runnable)
  - execute
```
public void execute(Runnable task,
                    long startTimeout)
```
    Executes the given task, within a concurrency throttle if configured (through the superclass's settings).
    Executes urgent tasks (with 'immediate' timeout) directly, bypassing the concurrency throttle (if active). All other tasks are subject to throttling.
    Specified by:
    execute in interface AsyncTaskExecutor
    Parameters:
    task - the Runnable to execute (never null)
    startTimeout - the time duration (milliseconds) within which the task is supposed to start. This is intended as a hint to the executor, allowing for preferred handling of immediate tasks. Typical values are AsyncTaskExecutor.TIMEOUT_IMMEDIATE or AsyncTaskExecutor.TIMEOUT_INDEFINITE (the default as used by TaskExecutor.execute(Runnable)).
    See Also:
    AsyncTaskExecutor.TIMEOUT_IMMEDIATE, doExecute(Runnable)
  - submit
```
public Future<?> submit(Runnable task)
```
    Description copied from interface: AsyncTaskExecutor
    Submit a Runnable task for execution, receiving a Future representing that task. The Future will return a null result upon completion.
    Specified by:
    submit in interface AsyncTaskExecutor
    Parameters:
    task - the Runnable to execute (never null)
    Returns:
    a Future representing pending completion of the task
  - submit
```
public <T> Future<T> submit(Callable<T> task)
```
    Description copied from interface: AsyncTaskExecutor
    Submit a Callable task for execution, receiving a Future representing that task. The Future will return the Callable's result upon completion.
    Specified by:
    submit in interface AsyncTaskExecutor
    Parameters:
    task - the Callable to execute (never null)
    Returns:
    a Future representing pending completion of the task
  - submitListenable
```
public ListenableFuture<?> submitListenable(Runnable task)
```
    Description copied from interface: AsyncListenableTaskExecutor
    Submit a Runnable task for execution, receiving a ListenableFuture representing that task. The Future will return a null result upon completion.
    Specified by:
    submitListenable in interface AsyncListenableTaskExecutor
    Parameters:
    task - the Runnable to execute (never null)
    Returns:
    a ListenableFuture representing pending completion of the task
  - submitListenable
```
public <T> ListenableFuture<T> submitListenable(Callable<T> task)
```
    Description copied from interface: AsyncListenableTaskExecutor
    Submit a Callable task for execution, receiving a ListenableFuture representing that task. The Future will return the Callable's result upon completion.
    Specified by:
    submitListenable in interface AsyncListenableTaskExecutor
    Parameters:
    task - the Callable to execute (never null)
    Returns:
    a ListenableFuture representing pending completion of the task
  - doExecute
```
protected void doExecute(Runnable task)
```
    Template method for the actual execution of a task.
    The default implementation creates a new Thread and starts it.
    Parameters:
    task - the Runnable to execute
    See Also:
    setThreadFactory(java.util.concurrent.ThreadFactory), CustomizableThreadCreator.createThread(java.lang.Runnable), Thread.start()

Class SimpleAsyncTaskExecutor

Field Summary

Fields inherited from interface org.springframework.core.task.AsyncTaskExecutor

Constructor Summary

Method Summary

Methods inherited from class org.springframework.util.CustomizableThreadCreator

Methods inherited from class java.lang.Object

Field Detail

UNBOUNDED_CONCURRENCY

NO_CONCURRENCY

Constructor Detail

SimpleAsyncTaskExecutor

SimpleAsyncTaskExecutor

SimpleAsyncTaskExecutor

Method Detail

setThreadFactory

getThreadFactory

setTaskDecorator

setConcurrencyLimit

getConcurrencyLimit

isThrottleActive

execute

execute

submit

submit

submitListenable

submitListenable

doExecute