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


java.lang.Object
   org.springframework.scheduling.backportconcurrent.ScheduledExecutorTask

ScheduledExecutorTask
public class ScheduledExecutorTask (Code)
JavaBean that describes a scheduled executor task, consisting of the Runnable and a delay plus period. The period needs to be specified; there is no point in a default for it.

The JSR-166 backport edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService does not offer more sophisticated scheduling options such as cron expressions. Consider using Quartz for such advanced needs.

Note that the edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService mechanism uses a Runnable instance that is shared between repeated executions, in contrast to Quartz which creates a new Job instance for each execution.

This class is analogous to the org.springframework.scheduling.timer.ScheduledTimerTask class for the JDK 1.3 java.util.Timer facility.
author:
   Juergen Hoeller
since:
   2.0.3
See Also:   edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService.scheduleWithFixedDelay(java.lang.Runnablelonglongedu.emory.mathcs.backport.java.util.concurrent.TimeUnit)
See Also:   edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService.scheduleAtFixedRate(java.lang.Runnablelonglongedu.emory.mathcs.backport.java.util.concurrent.TimeUnit)
See Also:   org.springframework.scheduling.timer.ScheduledTimerTask




Constructor Summary
public  ScheduledExecutorTask()
     Create a new ScheduledExecutorTask, to be populated via bean properties.
public  ScheduledExecutorTask(Runnable executorTask)
     Create a new ScheduledExecutorTask, with default one-time execution without delay.
public  ScheduledExecutorTask(Runnable executorTask, long delay)
     Create a new ScheduledExecutorTask, with default one-time execution with the given delay.
public  ScheduledExecutorTask(Runnable executorTask, long delay, long period, boolean fixedRate)
     Create a new ScheduledExecutorTask.

Method Summary
public  longgetDelay()
     Return the delay before starting the job for the first time.
public  longgetPeriod()
     Return the period between repeated task executions.
public  RunnablegetRunnable()
     Return the Runnable to schedule as executor task.
public  TimeUnitgetTimeUnit()
     Return the time unit for the delay and period values.
public  booleanisFixedRate()
     Return whether to schedule as fixed-rate execution.
public  booleanisOneTimeTask()
    
public  voidsetDelay(long delay)
     Set the delay before starting the task for the first time, in milliseconds.
public  voidsetFixedRate(boolean fixedRate)
     Set whether to schedule as fixed-rate execution, rather than fixed-delay execution.
public  voidsetPeriod(long period)
     Set the period between repeated task executions, in milliseconds.

Default is -1, leading to one-time execution.

public  voidsetRunnable(Runnable executorTask)
     Set the Runnable to schedule as executor task.
public  voidsetTimeUnit(TimeUnit timeUnit)
     Specify the time unit for the delay and period values.


Constructor Detail
ScheduledExecutorTask
public ScheduledExecutorTask()(Code)
Create a new ScheduledExecutorTask, to be populated via bean properties.
See Also:   ScheduledExecutorTask.setDelay
See Also:   ScheduledExecutorTask.setPeriod
See Also:   ScheduledExecutorTask.setFixedRate



ScheduledExecutorTask
public ScheduledExecutorTask(Runnable executorTask)(Code)
Create a new ScheduledExecutorTask, with default one-time execution without delay.
Parameters:
  executorTask - the Runnable to schedule



ScheduledExecutorTask
public ScheduledExecutorTask(Runnable executorTask, long delay)(Code)
Create a new ScheduledExecutorTask, with default one-time execution with the given delay.
Parameters:
  executorTask - the Runnable to schedule
Parameters:
  delay - the delay before starting the task for the first time (ms)



ScheduledExecutorTask
public ScheduledExecutorTask(Runnable executorTask, long delay, long period, boolean fixedRate)(Code)
Create a new ScheduledExecutorTask.
Parameters:
  executorTask - the Runnable to schedule
Parameters:
  delay - the delay before starting the task for the first time (ms)
Parameters:
  period - the period between repeated task executions (ms)
Parameters:
  fixedRate - whether to schedule as fixed-rate execution




Method Detail
getDelay
public long getDelay()(Code)
Return the delay before starting the job for the first time.



getPeriod
public long getPeriod()(Code)
Return the period between repeated task executions.



getRunnable
public Runnable getRunnable()(Code)
Return the Runnable to schedule as executor task.



getTimeUnit
public TimeUnit getTimeUnit()(Code)
Return the time unit for the delay and period values.



isFixedRate
public boolean isFixedRate()(Code)
Return whether to schedule as fixed-rate execution.



isOneTimeTask
public boolean isOneTimeTask()(Code)
Is this task only ever going to execute once? true if this task is only ever going to execute once
See Also:   ScheduledExecutorTask.getPeriod()



setDelay
public void setDelay(long delay)(Code)
Set the delay before starting the task for the first time, in milliseconds. Default is 0, immediately starting the task after successful scheduling.



setFixedRate
public void setFixedRate(boolean fixedRate)(Code)
Set whether to schedule as fixed-rate execution, rather than fixed-delay execution. Default is "false", that is, fixed delay.

See ScheduledExecutorService javadoc for details on those execution modes.
See Also:   edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService.scheduleWithFixedDelay(java.lang.Runnablelonglongedu.emory.mathcs.backport.java.util.concurrent.TimeUnit)
See Also:   edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService.scheduleAtFixedRate(java.lang.Runnablelonglongedu.emory.mathcs.backport.java.util.concurrent.TimeUnit)




setPeriod
public void setPeriod(long period)(Code)
Set the period between repeated task executions, in milliseconds.

Default is -1, leading to one-time execution. In case of a positive value, the task will be executed repeatedly, with the given interval inbetween executions.

Note that the semantics of the period value vary between fixed-rate and fixed-delay execution.

Note: A period of 0 (for example as fixed delay) is not supported, simply because edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService itself does not support it. Hence a value of 0 will be treated as one-time execution; however, that value should never be specified explicitly in the first place!
See Also:   ScheduledExecutorTask.setFixedRate
See Also:   ScheduledExecutorTask.isOneTimeTask()
See Also:   edu.emory.mathcs.backport.java.util.concurrent.ScheduledExecutorService.scheduleWithFixedDelay(java.lang.Runnablelonglongedu.emory.mathcs.backport.java.util.concurrent.TimeUnit)




setRunnable
public void setRunnable(Runnable executorTask)(Code)
Set the Runnable to schedule as executor task.



setTimeUnit
public void setTimeUnit(TimeUnit timeUnit)(Code)
Specify the time unit for the delay and period values. Default is milliseconds (TimeUnit.MILLISECONDS).
See Also:   edu.emory.mathcs.backport.java.util.concurrent.TimeUnit.MILLISECONDS
See Also:   edu.emory.mathcs.backport.java.util.concurrent.TimeUnit.SECONDS



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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