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SimpleAsyncTaskExecutor (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.core.task
Class SimpleAsyncTaskExecutor

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

All Implemented Interfaces:

Serializable, AsyncTaskExecutor, TaskExecutor

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public class SimpleAsyncTaskExecutor
extends CustomizableThreadCreator
implements AsyncTaskExecutor, 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, TimerTaskExecutor, ThreadPoolTaskExecutor, WorkManagerTaskExecutor, Serialized Form

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Field Summary
static String	DEFAULT_THREAD_NAME_PREFIX           Deprecated. as of Spring 2.0.3, since the default thread name prefix is now taken from the concrete class (could be a subclass)
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
SimpleAsyncTaskExecutor()           Create a new SimpleAsyncTaskExecutor with default thread name prefix.
SimpleAsyncTaskExecutor(String threadNamePrefix)           Create a new SimpleAsyncTaskExecutor with the given thread name prefix.

 

Method Summary
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.
boolean	isThrottleActive()           Return whether this throttle is currently active.
void	setConcurrencyLimit(int concurrencyLimit)           Set the maximum number of parallel accesses allowed

 

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

DEFAULT_THREAD_NAME_PREFIX

public static final String DEFAULT_THREAD_NAME_PREFIX

Deprecated. as of Spring 2.0.3, since the default thread name prefix is now taken from the concrete class (could be a subclass)

Default thread name prefix: "SimpleAsyncTaskExecutor-".

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UNBOUNDED_CONCURRENCY

public static final int UNBOUNDED_CONCURRENCY

Permit any number of concurrent invocations: that is, don't throttle concurrency.

See Also:

Constant Field Values

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NO_CONCURRENCY

public static final int NO_CONCURRENCY

Switch concurrency 'off': that is, don't allow any concurrent invocations.

See Also:

Constant Field Values

Constructor Detail

SimpleAsyncTaskExecutor

public SimpleAsyncTaskExecutor()

Create a new SimpleAsyncTaskExecutor with default thread name prefix.

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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

Method Detail

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

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getConcurrencyLimit

public int getConcurrencyLimit()

Return the maximum number of parallel accesses allowed.

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isThrottleActive

public 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)

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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 TaskExecutor

Parameters:

task - the Runnable to execute (never null)

See Also:

doExecute(Runnable)

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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 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)

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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:

CustomizableThreadCreator.createThread(java.lang.Runnable), Thread.start()

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