org.springframework.scheduling.concurrent
Class ThreadPoolTaskScheduler

java.lang.Object
  org.springframework.util.CustomizableThreadCreator
      org.springframework.scheduling.concurrent.CustomizableThreadFactory
          org.springframework.scheduling.concurrent.ExecutorConfigurationSupport
              org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler

All Implemented Interfaces:

java.io.Serializable, java.util.concurrent.Executor, java.util.concurrent.ThreadFactory, Aware, BeanNameAware, DisposableBean, InitializingBean, AsyncTaskExecutor, TaskExecutor, SchedulingTaskExecutor, TaskScheduler

public class ThreadPoolTaskScheduler
extends ExecutorConfigurationSupport
implements TaskScheduler, SchedulingTaskExecutor

Implementation of Spring's TaskScheduler interface, wrapping a native ScheduledThreadPoolExecutor.

Since:

3.0

Author:

Juergen Hoeller, Mark Fisher

See Also:

setPoolSize(int), ExecutorConfigurationSupport.setThreadFactory(java.util.concurrent.ThreadFactory), setErrorHandler(org.springframework.util.ErrorHandler), Serialized Form

Nested Class Summary

private static class

ThreadPoolTaskScheduler.DelegatingErrorHandlingCallable<V>

Field Summary

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

Fields inherited from class org.springframework.scheduling.concurrent.ExecutorConfigurationSupport

logger

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

TIMEOUT_IMMEDIATE, TIMEOUT_INDEFINITE

Constructor Summary

ThreadPoolTaskScheduler()

Method Summary

protected java.util.concurrent.ScheduledExecutorService	createExecutor(int poolSize, java.util.concurrent.ThreadFactory threadFactory, java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler) Create a new ScheduledExecutorService instance.
private java.lang.Runnable	errorHandlingTask(java.lang.Runnable task, boolean isRepeatingTask)
void	execute(java.lang.Runnable task) Execute the given task.
void	execute(java.lang.Runnable task, long startTimeout) Execute the given task.
java.util.concurrent.ScheduledExecutorService	getScheduledExecutor() Return the underlying ScheduledExecutorService for native access.
protected java.util.concurrent.ExecutorService	initializeExecutor(java.util.concurrent.ThreadFactory threadFactory, java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler) Create the target ExecutorService instance.
boolean	prefersShortLivedTasks() Does this TaskExecutor prefer short-lived tasks over long-lived tasks?
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	setPoolSize(int poolSize) Set the ScheduledExecutorService's pool size.
<T> java.util.concurrent.Future<T>	submit(java.util.concurrent.Callable<T> task) Submit a Callable task for execution, receiving a Future representing that task.
java.util.concurrent.Future<?>	submit(java.lang.Runnable task) Submit a Runnable task for execution, receiving a Future representing that task.

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

afterPropertiesSet, destroy, initialize, setBeanName, setRejectedExecutionHandler, setThreadFactory, setThreadNamePrefix, setWaitForTasksToCompleteOnShutdown, shutdown

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

newThread

Methods inherited from class org.springframework.util.CustomizableThreadCreator

createThread, getDefaultThreadNamePrefix, getThreadGroup, getThreadNamePrefix, getThreadPriority, isDaemon, nextThreadName, setDaemon, setThreadGroup, setThreadGroupName, setThreadPriority

Methods inherited from class java.lang.Object

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

Field Detail

poolSize

private volatile int poolSize

scheduledExecutor

private volatile java.util.concurrent.ScheduledExecutorService scheduledExecutor

errorHandler

private volatile ErrorHandler errorHandler

Constructor Detail

ThreadPoolTaskScheduler

public ThreadPoolTaskScheduler()

Method Detail

setPoolSize

public void setPoolSize(int poolSize)

Set the ScheduledExecutorService's pool size. Default is 1.

setErrorHandler

public void setErrorHandler(ErrorHandler errorHandler)

Provide an ErrorHandler strategy.

initializeExecutor

protected java.util.concurrent.ExecutorService initializeExecutor(java.util.concurrent.ThreadFactory threadFactory,
                                                                  java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler)

Description copied from class: ExecutorConfigurationSupport

Create the target ExecutorService instance. Called by afterPropertiesSet.

Specified by:

initializeExecutor in class ExecutorConfigurationSupport

Parameters:

threadFactory - the ThreadFactory to use

rejectedExecutionHandler - the RejectedExecutionHandler to use

Returns:

a new ExecutorService instance

See Also:

ExecutorConfigurationSupport.afterPropertiesSet()

createExecutor

protected java.util.concurrent.ScheduledExecutorService createExecutor(int poolSize,
                                                                       java.util.concurrent.ThreadFactory threadFactory,
                                                                       java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler)

Create a new ScheduledExecutorService instance.

The default implementation creates a ScheduledThreadPoolExecutor. Can be overridden in subclasses to provide custom ScheduledExecutorService instances.

Parameters:

poolSize - the specified pool size

threadFactory - the ThreadFactory to use

rejectedExecutionHandler - the RejectedExecutionHandler to use

Returns:

a new ScheduledExecutorService instance

See Also:

ExecutorConfigurationSupport.afterPropertiesSet(), ScheduledThreadPoolExecutor

getScheduledExecutor

public java.util.concurrent.ScheduledExecutorService getScheduledExecutor()
                                                                   throws java.lang.IllegalStateException

Return the underlying ScheduledExecutorService for native access.

Returns:

the underlying ScheduledExecutorService (never null)

Throws:

java.lang.IllegalStateException - if the ThreadPoolTaskScheduler hasn't been initialized yet

execute

public void execute(java.lang.Runnable task)

Description copied from interface: TaskExecutor

Execute the given task.

The call might return immediately if the implementation uses an asynchronous execution strategy, or might block in the case of synchronous execution.

Specified by:

execute in interface java.util.concurrent.Executor

Specified by:

execute in interface TaskExecutor

Parameters:

task - the Runnable to execute (never null)

execute

public void execute(java.lang.Runnable task,
                    long startTimeout)

Description copied from interface: AsyncTaskExecutor

Execute the given task.

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)).

submit

public java.util.concurrent.Future<?> submit(java.lang.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> java.util.concurrent.Future<T> submit(java.util.concurrent.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

prefersShortLivedTasks

public boolean prefersShortLivedTasks()

Description copied from interface: SchedulingTaskExecutor

Does this TaskExecutor prefer short-lived tasks over long-lived tasks?

A SchedulingTaskExecutor implementation can indicate whether it prefers submitted tasks to perform as little work as they can within a single task execution. For example, submitted tasks might break a repeated loop into individual subtasks which submit a follow-up task afterwards (if feasible).

This should be considered a hint. Of course TaskExecutor clients are free to ignore this flag and hence the SchedulingTaskExecutor interface overall. However, thread pools will usually indicated a preference for short-lived tasks, to be able to perform more fine-grained scheduling.

Specified by:

prefersShortLivedTasks in interface SchedulingTaskExecutor

Returns:

true if this TaskExecutor prefers short-lived tasks

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)