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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.core.task 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


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

SimpleAsyncTaskExecutor
public class SimpleAsyncTaskExecutor extends CustomizableThreadCreator implements AsyncTaskExecutor,Serializable(Code)
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.
author:
   Juergen Hoeller
since:
   2.0
See Also:   SimpleAsyncTaskExecutor.setConcurrencyLimit
See Also:   SyncTaskExecutor
See Also:   org.springframework.scheduling.timer.TimerTaskExecutor
See Also:   org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor
See Also:   org.springframework.scheduling.commonj.WorkManagerTaskExecutor



Field Summary
final public static  StringDEFAULT_THREAD_NAME_PREFIX
     Default thread name prefix: "SimpleAsyncTaskExecutor-".
final public static  intNO_CONCURRENCY
     Switch concurrency 'off': that is, don't allow any concurrent invocations.
final public static  intUNBOUNDED_CONCURRENCY
     Permit any number of concurrent invocations: that is, don't throttle concurrency.

Constructor Summary
public  SimpleAsyncTaskExecutor()
     Create a new SimpleAsyncTaskExecutor with default thread name prefix.
public  SimpleAsyncTaskExecutor(String threadNamePrefix)
     Create a new SimpleAsyncTaskExecutor with the given thread name prefix.

Method Summary
protected  voiddoExecute(Runnable task)
     Template method for the actual execution of a task.
public  voidexecute(Runnable task)
     Executes the given task, within a concurrency throttle if configured (through the superclass's settings).
public  voidexecute(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).

public  intgetConcurrencyLimit()
     Return the maximum number of parallel accesses allowed.
public  booleanisThrottleActive()
     Return whether this throttle is currently active.
public  voidsetConcurrencyLimit(int concurrencyLimit)
     Set the maximum number of parallel accesses allowed.

Field Detail
DEFAULT_THREAD_NAME_PREFIX
final public static String DEFAULT_THREAD_NAME_PREFIX(Code)
Default thread name prefix: "SimpleAsyncTaskExecutor-".



NO_CONCURRENCY
final public static int NO_CONCURRENCY(Code)
Switch concurrency 'off': that is, don't allow any concurrent invocations.



UNBOUNDED_CONCURRENCY
final public static int UNBOUNDED_CONCURRENCY(Code)
Permit any number of concurrent invocations: that is, don't throttle concurrency.




Constructor Detail
SimpleAsyncTaskExecutor
public SimpleAsyncTaskExecutor()(Code)
Create a new SimpleAsyncTaskExecutor with default thread name prefix.



SimpleAsyncTaskExecutor
public SimpleAsyncTaskExecutor(String threadNamePrefix)(Code)
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
doExecute
protected void doExecute(Runnable task)(Code)
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:   SimpleAsyncTaskExecutor.createThread
See Also:   java.lang.Thread.start




execute
public void execute(Runnable task)(Code)
Executes the given task, within a concurrency throttle if configured (through the superclass's settings).
See Also:   SimpleAsyncTaskExecutor.doExecute(Runnable)



execute
public void execute(Runnable task, long startTimeout)(Code)
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.
See Also:   SimpleAsyncTaskExecutor.TIMEOUT_IMMEDIATE
See Also:   SimpleAsyncTaskExecutor.doExecute(Runnable)




getConcurrencyLimit
public int getConcurrencyLimit()(Code)
Return the maximum number of parallel accesses allowed.



isThrottleActive
public boolean isThrottleActive()(Code)
Return whether this throttle is currently active. true if the concurrency limit for this instance is active
See Also:   SimpleAsyncTaskExecutor.getConcurrencyLimit()
See Also:   SimpleAsyncTaskExecutor.setConcurrencyLimit



setConcurrencyLimit
public void setConcurrencyLimit(int concurrencyLimit)(Code)
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:   SimpleAsyncTaskExecutor.UNBOUNDED_CONCURRENCY




Methods inherited from org.springframework.util.CustomizableThreadCreator
public Thread createThread(Runnable runnable)(Code)(Java Doc)
protected String getDefaultThreadNamePrefix()(Code)(Java Doc)
public ThreadGroup getThreadGroup()(Code)(Java Doc)
public String getThreadNamePrefix()(Code)(Java Doc)
public int getThreadPriority()(Code)(Java Doc)
public boolean isDaemon()(Code)(Java Doc)
protected String nextThreadName()(Code)(Java Doc)
public void setDaemon(boolean daemon)(Code)(Java Doc)
public void setThreadGroup(ThreadGroup threadGroup)(Code)(Java Doc)
public void setThreadGroupName(String name)(Code)(Java Doc)
public void setThreadNamePrefix(String threadNamePrefix)(Code)(Java Doc)
public void setThreadPriority(int threadPriority)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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