Package org.springframework.scheduling.concurrent

Class ConcurrentTaskScheduler

java.lang.Object

org.springframework.scheduling.concurrent.ConcurrentTaskExecutor

org.springframework.scheduling.concurrent.ConcurrentTaskScheduler

All Implemented Interfaces:

Executor, AsyncListenableTaskExecutor, AsyncTaskExecutor, TaskExecutor, SchedulingTaskExecutor, TaskScheduler

Direct Known Subclasses:

DefaultManagedTaskScheduler

public class ConcurrentTaskScheduler
extends ConcurrentTaskExecutor
implements TaskScheduler

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

Autodetects a JSR-236 ManagedScheduledExecutorService in order to use it for trigger-based scheduling if possible, instead of Spring's local trigger management which ends up delegating to regular delay-based scheduling against the java.util.concurrent.ScheduledExecutorService API. For JSR-236 style lookup in a Jakarta EE environment, consider using DefaultManagedTaskScheduler.

Note that there is a pre-built ThreadPoolTaskScheduler that allows for defining a 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, Arjen Poutsma

See Also:

• ScheduledExecutorService
• ScheduledThreadPoolExecutor
• Executors
• DefaultManagedTaskScheduler
• ThreadPoolTaskScheduler

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.scheduling.concurrent.ConcurrentTaskExecutor

ConcurrentTaskExecutor.ManagedTaskBuilder

Field Summary

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

TIMEOUT_IMMEDIATE, TIMEOUT_INDEFINITE

Constructor Summary

Constructors

Constructor	Description
ConcurrentTaskScheduler()	Deprecated. in favor of ConcurrentTaskScheduler(ScheduledExecutorService) with an externally provided Executor
ConcurrentTaskScheduler(Executor concurrentExecutor, ScheduledExecutorService scheduledExecutor)	Create a new ConcurrentTaskScheduler, using the given Executor and ScheduledExecutorService as delegates.
ConcurrentTaskScheduler(ScheduledExecutorService scheduledExecutor)	Create a new ConcurrentTaskScheduler, using the given ScheduledExecutorService as shared delegate.

Method Summary

Modifier and Type	Method	Description
void	execute(Runnable task)	Execute the given task.
Clock	getClock()	Return the clock to use for scheduling purposes.
ScheduledFuture<?>	schedule(Runnable task, Instant startTime)	Schedule the given Runnable, invoking it at the specified execution time.
ScheduledFuture<?>	schedule(Runnable task, Trigger trigger)	Schedule the given Runnable, invoking it whenever the trigger indicates a next execution time.
ScheduledFuture<?>	scheduleAtFixedRate(Runnable task, Duration period)	Schedule the given Runnable, starting as soon as possible and invoking it with the given period.
ScheduledFuture<?>	scheduleAtFixedRate(Runnable task, Instant startTime, Duration period)	Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given period.
ScheduledFuture<?>	scheduleWithFixedDelay(Runnable task, Duration 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.
ScheduledFuture<?>	scheduleWithFixedDelay(Runnable task, Instant startTime, Duration 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.
void	setClock(Clock clock)	Set the clock to use for scheduling purposes.
void	setErrorHandler(ErrorHandler errorHandler)	Provide an ErrorHandler strategy.
void	setScheduledExecutor(ScheduledExecutorService scheduledExecutor)	Specify the ScheduledExecutorService to delegate to.
Future<?>	submit(Runnable task)	Submit a Runnable task for execution, receiving a Future representing that task.
<T> Future<T>	submit(Callable<T> task)	Submit a Callable task for execution, receiving a Future representing that task.
ListenableFuture<?>	submitListenable(Runnable task)	Submit a Runnable task for execution, receiving a ListenableFuture representing that task.
<T> ListenableFuture<T>	submitListenable(Callable<T> task)	Submit a Callable task for execution, receiving a ListenableFuture representing that task.

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

execute, getConcurrentExecutor, setConcurrentExecutor, setTaskDecorator

Methods inherited from class java.lang.Object

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

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

submitCompletable, submitCompletable

Methods inherited from interface org.springframework.scheduling.SchedulingTaskExecutor

prefersShortLivedTasks

Methods inherited from interface org.springframework.scheduling.TaskScheduler

schedule, scheduleAtFixedRate, scheduleAtFixedRate, scheduleWithFixedDelay, scheduleWithFixedDelay

Constructor Details

ConcurrentTaskScheduler

@Deprecated(since="6.1")
public ConcurrentTaskScheduler()

Deprecated.

in favor of ConcurrentTaskScheduler(ScheduledExecutorService) with an externally provided Executor

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

See Also:

• Executors.newSingleThreadScheduledExecutor()

ConcurrentTaskScheduler

public ConcurrentTaskScheduler(@Nullable
 ScheduledExecutorService scheduledExecutor)

Create a new ConcurrentTaskScheduler, using the given ScheduledExecutorService as shared delegate.

Autodetects a JSR-236 ManagedScheduledExecutorService in order to use it for trigger-based scheduling if possible, instead of Spring's local trigger management.

Parameters:

scheduledExecutor - the ScheduledExecutorService to delegate to for SchedulingTaskExecutor as well as TaskScheduler invocations

ConcurrentTaskScheduler

public ConcurrentTaskScheduler(Executor concurrentExecutor,
 ScheduledExecutorService scheduledExecutor)

Create a new ConcurrentTaskScheduler, using the given Executor and ScheduledExecutorService as delegates.

Autodetects a JSR-236 ManagedScheduledExecutorService in order to use it for trigger-based scheduling if possible, instead of Spring's local trigger management.

Parameters:

concurrentExecutor - the Executor to delegate to for SchedulingTaskExecutor invocations

scheduledExecutor - the ScheduledExecutorService to delegate to for TaskScheduler invocations

Method Details

setScheduledExecutor

public void setScheduledExecutor(ScheduledExecutorService scheduledExecutor)

Specify the ScheduledExecutorService to delegate to.

Autodetects a JSR-236 ManagedScheduledExecutorService in order to use it for trigger-based scheduling if possible, instead of Spring's local trigger management.

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.

setClock

public void setClock(Clock clock)

Set the clock to use for scheduling purposes.

The default clock is the system clock for the default time zone.

Since:

5.3

See Also:

• Clock.systemDefaultZone()

getClock

public Clock getClock()

Description copied from interface: TaskScheduler

Return the clock to use for scheduling purposes.

Specified by:

getClock in interface TaskScheduler

See Also:

• Clock.systemDefaultZone()

execute

public void execute(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 Executor

Specified by:

execute in interface TaskExecutor

Overrides:

execute in class ConcurrentTaskExecutor

Parameters:

task - the Runnable to execute (never null)

submit

public Future<?> submit(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.

As of 6.1, this method comes with a default implementation that delegates to TaskExecutor.execute(Runnable).

Specified by:

submit in interface AsyncTaskExecutor

Overrides:

submit in class ConcurrentTaskExecutor

Parameters:

task - the Runnable to execute (never null)

Returns:

a Future representing pending completion of the task

submit

public <T> Future<T> submit(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.

As of 6.1, this method comes with a default implementation that delegates to TaskExecutor.execute(Runnable).

Specified by:

submit in interface AsyncTaskExecutor

Overrides:

submit in class ConcurrentTaskExecutor

Parameters:

task - the Callable to execute (never null)

Returns:

a Future representing pending completion of the task

submitListenable

public ListenableFuture<?> submitListenable(Runnable task)

Description copied from interface: AsyncListenableTaskExecutor

Submit a Runnable task for execution, receiving a ListenableFuture representing that task. The Future will return a null result upon completion.

Specified by:

submitListenable in interface AsyncListenableTaskExecutor

Overrides:

submitListenable in class ConcurrentTaskExecutor

Parameters:

task - the Runnable to execute (never null)

Returns:

a ListenableFuture representing pending completion of the task

submitListenable

public <T> ListenableFuture<T> submitListenable(Callable<T> task)

Description copied from interface: AsyncListenableTaskExecutor

Submit a Callable task for execution, receiving a ListenableFuture representing that task. The Future will return the Callable's result upon completion.

Specified by:

submitListenable in interface AsyncListenableTaskExecutor

Overrides:

submitListenable in class ConcurrentTaskExecutor

Parameters:

task - the Callable to execute (never null)

Returns:

a ListenableFuture representing pending completion of the task

schedule

@Nullable
public ScheduledFuture<?> schedule(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, for example, a CronTrigger object wrapping a cron expression

Returns:

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

See Also:

• CronTrigger

schedule

public ScheduledFuture<?> schedule(Runnable task,
 Instant 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 execution of the task

scheduleAtFixedRate

public ScheduledFuture<?> scheduleAtFixedRate(Runnable task,
 Instant startTime,
 Duration 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

Returns:

a ScheduledFuture representing pending execution of the task

scheduleAtFixedRate

public ScheduledFuture<?> scheduleAtFixedRate(Runnable task,
 Duration 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

Returns:

a ScheduledFuture representing pending execution of the task

scheduleWithFixedDelay

public ScheduledFuture<?> scheduleWithFixedDelay(Runnable task,
 Instant startTime,
 Duration 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

Returns:

a ScheduledFuture representing pending execution of the task

scheduleWithFixedDelay

public ScheduledFuture<?> scheduleWithFixedDelay(Runnable task,
 Duration 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 delay between the completion of one execution and the start of the next

Returns:

a ScheduledFuture representing pending execution of the task