org.springframework.scheduling.concurrent
Class ConcurrentTaskScheduler

java.lang.Object
  org.springframework.scheduling.concurrent.ConcurrentTaskExecutor
      org.springframework.scheduling.concurrent.ConcurrentTaskScheduler

All Implemented Interfaces:

java.util.concurrent.Executor, AsyncTaskExecutor, TaskExecutor, SchedulingTaskExecutor, TaskScheduler

public class ConcurrentTaskScheduler
extends ConcurrentTaskExecutor
implements TaskScheduler

Adapter that takes a JDK 1.5 java.util.concurrent.ScheduledExecutorService and exposes a Spring TaskScheduler for it. Extends ConcurrentTaskExecutor in order to implement the SchedulingTaskExecutor interface as well.

Note that there is a pre-built ThreadPoolTaskScheduler that allows for defining a JDK 1.5 ScheduledThreadPoolExecutor in bean style, exposing it as a Spring TaskScheduler directly. This is a convenient alternative to a raw ScheduledThreadPoolExecutor definition with a separate definition of the present adapter class.

Since:

3.0

Author:

Juergen Hoeller, Mark Fisher

See Also:

ScheduledExecutorService, ScheduledThreadPoolExecutor, Executors, ThreadPoolTaskScheduler

Field Summary

private ErrorHandler	errorHandler
private java.util.concurrent.ScheduledExecutorService	scheduledExecutor

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

TIMEOUT_IMMEDIATE, TIMEOUT_INDEFINITE

Constructor Summary

ConcurrentTaskScheduler()
Create a new ConcurrentTaskScheduler, using a single thread executor as default.

ConcurrentTaskScheduler(java.util.concurrent.Executor concurrentExecutor, java.util.concurrent.ScheduledExecutorService scheduledExecutor)
Create a new ConcurrentTaskScheduler, using the given JDK 1.5 executors as delegates.

ConcurrentTaskScheduler(java.util.concurrent.ScheduledExecutorService scheduledExecutor)
Create a new ConcurrentTaskScheduler, using the given JDK 1.5 executor as shared delegate.

Method Summary

private java.lang.Runnable	errorHandlingTask(java.lang.Runnable task, boolean isRepeatingTask)
java.util.concurrent.ScheduledFuture	schedule(java.lang.Runnable task, java.util.Date startTime) Schedule the given Runnable, invoking it at the specified execution time.
java.util.concurrent.ScheduledFuture	schedule(java.lang.Runnable task, Trigger trigger) Schedule the given Runnable, invoking it whenever the trigger indicates a next execution time.
java.util.concurrent.ScheduledFuture	scheduleAtFixedRate(java.lang.Runnable task, java.util.Date startTime, long period) Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given period.
java.util.concurrent.ScheduledFuture	scheduleAtFixedRate(java.lang.Runnable task, long period) Schedule the given Runnable, starting as soon as possible and invoking it with the given period.
java.util.concurrent.ScheduledFuture	scheduleWithFixedDelay(java.lang.Runnable task, java.util.Date startTime, long delay) Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given delay between the completion of one execution and the start of the next.
java.util.concurrent.ScheduledFuture	scheduleWithFixedDelay(java.lang.Runnable task, long delay) Schedule the given Runnable, starting as soon as possible and invoking it with the given delay between the completion of one execution and the start of the next.
void	setErrorHandler(ErrorHandler errorHandler) Provide an ErrorHandler strategy.
void	setScheduledExecutor(java.util.concurrent.ScheduledExecutorService scheduledExecutor) Specify the JDK 1.5 scheduled executor to delegate to.

Methods inherited from class org.springframework.scheduling.concurrent.ConcurrentTaskExecutor

execute, execute, getConcurrentExecutor, prefersShortLivedTasks, setConcurrentExecutor, submit, submit

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

scheduledExecutor

private volatile java.util.concurrent.ScheduledExecutorService scheduledExecutor

errorHandler

private volatile ErrorHandler errorHandler

Constructor Detail

ConcurrentTaskScheduler

public ConcurrentTaskScheduler()

Create a new ConcurrentTaskScheduler, using a single thread executor as default.

See Also:

Executors.newSingleThreadScheduledExecutor()

ConcurrentTaskScheduler

public ConcurrentTaskScheduler(java.util.concurrent.ScheduledExecutorService scheduledExecutor)

Create a new ConcurrentTaskScheduler, using the given JDK 1.5 executor as shared delegate.

Parameters:

scheduledExecutor - the JDK 1.5 scheduled executor to delegate to for SchedulingTaskExecutor as well as TaskScheduler invocations

ConcurrentTaskScheduler

public ConcurrentTaskScheduler(java.util.concurrent.Executor concurrentExecutor,
                               java.util.concurrent.ScheduledExecutorService scheduledExecutor)

Create a new ConcurrentTaskScheduler, using the given JDK 1.5 executors as delegates.

Parameters:

concurrentExecutor - the JDK 1.5 concurrent executor to delegate to for SchedulingTaskExecutor invocations

scheduledExecutor - the JDK 1.5 scheduled executor to delegate to for TaskScheduler invocations

Method Detail

setScheduledExecutor

public final void setScheduledExecutor(java.util.concurrent.ScheduledExecutorService scheduledExecutor)

Specify the JDK 1.5 scheduled executor to delegate to.

Note: This will only apply to TaskScheduler invocations. If you want the given executor to apply to SchedulingTaskExecutor invocations as well, pass the same executor reference to ConcurrentTaskExecutor.setConcurrentExecutor(java.util.concurrent.Executor).

See Also:

ConcurrentTaskExecutor.setConcurrentExecutor(java.util.concurrent.Executor)

setErrorHandler

public void setErrorHandler(ErrorHandler errorHandler)

Provide an ErrorHandler strategy.

schedule

public java.util.concurrent.ScheduledFuture schedule(java.lang.Runnable task,
                                                     Trigger trigger)

Description copied from interface: TaskScheduler

Schedule the given Runnable, invoking it whenever the trigger indicates a next execution time.

Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

Specified by:

schedule in interface TaskScheduler

Parameters:

task - the Runnable to execute whenever the trigger fires

trigger - an implementation of the Trigger interface, e.g. a CronTrigger object wrapping a cron expression

Returns:

a ScheduledFuture representing pending completion of the task, or null if the given Trigger object never fires (i.e. returns null from Trigger.nextExecutionTime(org.springframework.scheduling.TriggerContext))

See Also:

CronTrigger

schedule

public java.util.concurrent.ScheduledFuture schedule(java.lang.Runnable task,
                                                     java.util.Date startTime)

Description copied from interface: TaskScheduler

Schedule the given Runnable, invoking it at the specified execution time.

Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

Specified by:

schedule in interface TaskScheduler

Parameters:

task - the Runnable to execute whenever the trigger fires

startTime - the desired execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)

Returns:

a ScheduledFuture representing pending completion of the task

scheduleAtFixedRate

public java.util.concurrent.ScheduledFuture scheduleAtFixedRate(java.lang.Runnable task,
                                                                java.util.Date startTime,
                                                                long period)

Description copied from interface: TaskScheduler

Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given period.

Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

Specified by:

scheduleAtFixedRate in interface TaskScheduler

Parameters:

task - the Runnable to execute whenever the trigger fires

startTime - the desired first execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)

period - the interval between successive executions of the task (in milliseconds)

Returns:

a ScheduledFuture representing pending completion of the task

scheduleAtFixedRate

public java.util.concurrent.ScheduledFuture scheduleAtFixedRate(java.lang.Runnable task,
                                                                long period)

Description copied from interface: TaskScheduler

Schedule the given Runnable, starting as soon as possible and invoking it with the given period.

Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

Specified by:

scheduleAtFixedRate in interface TaskScheduler

Parameters:

task - the Runnable to execute whenever the trigger fires

period - the interval between successive executions of the task (in milliseconds)

Returns:

a ScheduledFuture representing pending completion of the task

scheduleWithFixedDelay

public java.util.concurrent.ScheduledFuture scheduleWithFixedDelay(java.lang.Runnable task,
                                                                   java.util.Date startTime,
                                                                   long delay)

Description copied from interface: TaskScheduler

Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given delay between the completion of one execution and the start of the next.

Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

Specified by:

scheduleWithFixedDelay in interface TaskScheduler

Parameters:

task - the Runnable to execute whenever the trigger fires

startTime - the desired first execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)

delay - the delay between the completion of one execution and the start of the next (in milliseconds)

Returns:

a ScheduledFuture representing pending completion of the task

scheduleWithFixedDelay

public java.util.concurrent.ScheduledFuture scheduleWithFixedDelay(java.lang.Runnable task,
                                                                   long delay)

Description copied from interface: TaskScheduler

Schedule the given Runnable, starting as soon as possible and invoking it with the given delay between the completion of one execution and the start of the next.

Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

Specified by:

scheduleWithFixedDelay in interface TaskScheduler

Parameters:

task - the Runnable to execute whenever the trigger fires

delay - the interval between successive executions of the task (in milliseconds)

Returns:

a ScheduledFuture representing pending completion of the task

errorHandlingTask

private java.lang.Runnable errorHandlingTask(java.lang.Runnable task,
                                             boolean isRepeatingTask)