Package org.springframework.scheduling.concurrent

Class ExecutorConfigurationSupport

java.lang.Object

org.springframework.util.CustomizableThreadCreator

org.springframework.scheduling.concurrent.CustomizableThreadFactory

org.springframework.scheduling.concurrent.ExecutorConfigurationSupport

All Implemented Interfaces:

Serializable, ThreadFactory, EventListener, Aware, BeanNameAware, DisposableBean, InitializingBean, ApplicationContextAware, ApplicationListener<ContextClosedEvent>, Lifecycle, Phased, SmartLifecycle

Direct Known Subclasses:

ScheduledExecutorFactoryBean, ThreadPoolExecutorFactoryBean, ThreadPoolTaskExecutor, ThreadPoolTaskScheduler

public abstract class ExecutorConfigurationSupport
extends CustomizableThreadFactory
implements BeanNameAware, ApplicationContextAware, InitializingBean, DisposableBean, SmartLifecycle, ApplicationListener<ContextClosedEvent>

Base class for setting up a ExecutorService (typically a ThreadPoolExecutor or ScheduledThreadPoolExecutor).

Defines common configuration settings and common lifecycle handling, inheriting thread customization options (name, priority, etc) from CustomizableThreadCreator.

Since:

3.0

Author:

Juergen Hoeller

See Also:

• ExecutorService
• Executors
• ThreadPoolExecutor
• ScheduledThreadPoolExecutor
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_PHASE	The default phase for an executor SmartLifecycle: Integer.MAX_VALUE / 2.
protected final Log	logger

Constructor Summary

Constructors

Constructor	Description
ExecutorConfigurationSupport()

Method Summary

Modifier and Type	Method	Description
protected void	afterExecute(Runnable task, Throwable ex)	An after-execute callback for framework subclasses to delegate to (for start/stop handling), and possibly also for custom subclasses to extend (making sure to call this implementation as well).
void	afterPropertiesSet()	Calls initialize() after the container applied all property values.
protected void	beforeExecute(Thread thread, Runnable task)	A before-execute callback for framework subclasses to delegate to (for start/stop handling), and possibly also for custom subclasses to extend (making sure to call this implementation as well).
protected void	cancelRemainingTask(Runnable task)	Cancel the given remaining task which never commenced execution, as returned from ExecutorService.shutdownNow().
void	destroy()	Calls shutdown when the BeanFactory destroys the executor instance.
int	getPhase()	Return the lifecycle phase for pausing and resuming this executor.
void	initialize()	Set up the ExecutorService.
protected abstract ExecutorService	initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler)	Create the target ExecutorService instance.
protected void	initiateEarlyShutdown()	Early shutdown signal: do not trigger further tasks, let existing tasks complete before hitting the actual destruction step in the shutdown() method.
void	initiateShutdown()	Initiate a shutdown on the underlying ExecutorService, rejecting further task submissions.
boolean	isRunning()	Check whether this executor is not paused and has not been shut down either.
void	onApplicationEvent(ContextClosedEvent event)	ContextClosedEvent handler for initiating an early shutdown.
void	setAcceptTasksAfterContextClose(boolean acceptTasksAfterContextClose)	Set whether to accept further tasks after the application context close phase has begun.
void	setApplicationContext(ApplicationContext applicationContext)	Set the ApplicationContext that this object runs in.
void	setAwaitTerminationMillis(long awaitTerminationMillis)	Variant of setAwaitTerminationSeconds(int) with millisecond precision.
void	setAwaitTerminationSeconds(int awaitTerminationSeconds)	Set the maximum number of seconds that this executor is supposed to block on shutdown in order to wait for remaining tasks to complete their execution before the rest of the container continues to shut down.
void	setBeanName(String name)	Set the name of the bean in the bean factory that created this bean.
void	setPhase(int phase)	Specify the lifecycle phase for pausing and resuming this executor.
void	setRejectedExecutionHandler(RejectedExecutionHandler rejectedExecutionHandler)	Set the RejectedExecutionHandler to use for the ExecutorService.
void	setThreadFactory(ThreadFactory threadFactory)	Set the ThreadFactory to use for the ExecutorService's thread pool.
void	setThreadNamePrefix(String threadNamePrefix)	Specify the prefix to use for the names of newly created threads.
void	setWaitForTasksToCompleteOnShutdown(boolean waitForJobsToCompleteOnShutdown)	Set whether to wait for scheduled tasks to complete on shutdown, not interrupting running tasks and executing all tasks in the queue.
void	shutdown()	Perform a full shutdown on the underlying ExecutorService, according to the corresponding configuration settings.
void	start()	Resume this executor if paused before (otherwise a no-op).
void	stop()	Pause this executor, not waiting for tasks to complete.
void	stop(Runnable callback)	Pause this executor, triggering the given callback once all currently executing tasks have completed.

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

Methods inherited from interface org.springframework.context.ApplicationListener

supportsAsyncExecution

Methods inherited from interface org.springframework.context.SmartLifecycle

isAutoStartup

Field Details

DEFAULT_PHASE

public static final int DEFAULT_PHASE

The default phase for an executor SmartLifecycle: Integer.MAX_VALUE / 2.

This is different from the default phase Integer.MAX_VALUE associated with other SmartLifecycle implementations, putting the typically auto-started executor/scheduler beans into an earlier startup phase and a later shutdown phase while still leaving room for regular Lifecycle components with the common phase 0.

Since:

6.2

See Also:

• getPhase()
• SmartLifecycle.DEFAULT_PHASE
• DefaultLifecycleProcessor.setTimeoutPerShutdownPhase(long)
• Constant Field Values

logger

protected final Log logger

Constructor Details

ExecutorConfigurationSupport

public ExecutorConfigurationSupport()

Method Details

setThreadFactory

public void setThreadFactory(@Nullable
 ThreadFactory threadFactory)

Set the ThreadFactory to use for the ExecutorService's thread pool. The default is the underlying ExecutorService's default thread factory.

In a Jakarta EE or other managed environment with JSR-236 support, consider specifying a JNDI-located ManagedThreadFactory: by default, to be found at "java:comp/DefaultManagedThreadFactory". Use the "jee:jndi-lookup" namespace element in XML or the programmatic JndiLocatorDelegate for convenient lookup. Alternatively, consider using Spring's DefaultManagedAwareThreadFactory with its fallback to local threads in case of no managed thread factory found.

See Also:

• Executors.defaultThreadFactory()
• ManagedThreadFactory
• DefaultManagedAwareThreadFactory

setThreadNamePrefix

public void setThreadNamePrefix(@Nullable
 String threadNamePrefix)

Description copied from class: CustomizableThreadCreator

Specify the prefix to use for the names of newly created threads. Default is "SimpleAsyncTaskExecutor-".

Overrides:

setThreadNamePrefix in class CustomizableThreadCreator

setRejectedExecutionHandler

public void setRejectedExecutionHandler(@Nullable
 RejectedExecutionHandler rejectedExecutionHandler)

Set the RejectedExecutionHandler to use for the ExecutorService. The default is the ExecutorService's default abort policy.

See Also:

• ThreadPoolExecutor.AbortPolicy

setAcceptTasksAfterContextClose

public void setAcceptTasksAfterContextClose(boolean acceptTasksAfterContextClose)

Set whether to accept further tasks after the application context close phase has begun.

The default is false as of 6.1, triggering an early soft shutdown of the executor and therefore rejecting any further task submissions. Switch this to true in order to let other components submit tasks even during their own stop and destruction callbacks, at the expense of a longer shutdown phase. The executor will not go through a coordinated lifecycle stop phase then but rather only stop tasks on its own shutdown.

acceptTasksAfterContextClose=true like behavior also follows from "waitForTasksToCompleteOnShutdown" which effectively is a specific variant of this flag, replacing the early soft shutdown in the concurrent managed stop phase with a serial soft shutdown in the executor's destruction step, with individual awaiting according to the "awaitTerminationSeconds" property.

This flag will only have effect when the executor is running in a Spring application context and able to receive the ContextClosedEvent. Also, note that ThreadPoolTaskExecutor effectively accepts tasks after context close by default, in combination with a coordinated lifecycle stop, unless "strictEarlyShutdown" has been specified.

Since:

6.1

See Also:

• ConfigurableApplicationContext.close()
• DisposableBean.destroy()
• shutdown()
• setAwaitTerminationSeconds(int)

setWaitForTasksToCompleteOnShutdown

public void setWaitForTasksToCompleteOnShutdown(boolean waitForJobsToCompleteOnShutdown)

Set whether to wait for scheduled tasks to complete on shutdown, not interrupting running tasks and executing all tasks in the queue.

The default is false, with a coordinated lifecycle stop first (unless "acceptTasksAfterContextClose" has been set) and then an immediate shutdown through interrupting ongoing tasks and clearing the queue. Switch this flag to true if you prefer fully completed tasks at the expense of a longer shutdown phase. The executor will not go through a coordinated lifecycle stop phase then but rather only stop and wait for task completion on its own shutdown.

Note that Spring's container shutdown continues while ongoing tasks are being completed. If you want this executor to block and wait for the termination of tasks before the rest of the container continues to shut down - e.g. in order to keep up other resources that your tasks may need -, set the "awaitTerminationSeconds" property instead of or in addition to this property.

See Also:

• ExecutorService.shutdown()
• ExecutorService.shutdownNow()
• shutdown()
• setAwaitTerminationSeconds(int)

setAwaitTerminationSeconds

public void setAwaitTerminationSeconds(int awaitTerminationSeconds)

Set the maximum number of seconds that this executor is supposed to block on shutdown in order to wait for remaining tasks to complete their execution before the rest of the container continues to shut down. This is particularly useful if your remaining tasks are likely to need access to other resources that are also managed by the container.

By default, this executor won't wait for the termination of tasks at all. It will either shut down immediately, interrupting ongoing tasks and clearing the remaining task queue - or, if the "waitForTasksToCompleteOnShutdown" flag has been set to true, it will continue to fully execute all ongoing tasks as well as all remaining tasks in the queue, in parallel to the rest of the container shutting down.

In either case, if you specify an await-termination period using this property, this executor will wait for the given time (max) for the termination of tasks. As a rule of thumb, specify a significantly higher timeout here if you set "waitForTasksToCompleteOnShutdown" to true at the same time, since all remaining tasks in the queue will still get executed - in contrast to the default shutdown behavior where it's just about waiting for currently executing tasks that aren't reacting to thread interruption.

See Also:

• setAwaitTerminationMillis(long)
• ExecutorService.shutdown()
• ExecutorService.awaitTermination(long, java.util.concurrent.TimeUnit)

setAwaitTerminationMillis

public void setAwaitTerminationMillis(long awaitTerminationMillis)

Variant of setAwaitTerminationSeconds(int) with millisecond precision.

Since:

5.2.4

See Also:

• setAwaitTerminationSeconds(int)

setPhase

public void setPhase(int phase)

Specify the lifecycle phase for pausing and resuming this executor.

The default for executors/schedulers is DEFAULT_PHASE as of 6.2, for stopping after other SmartLifecycle implementations.

Since:

6.1

See Also:

• SmartLifecycle.getPhase()

getPhase

public int getPhase()

Return the lifecycle phase for pausing and resuming this executor.

Specified by:

getPhase in interface Phased

Specified by:

getPhase in interface SmartLifecycle

Since:

6.1

See Also:

• setPhase(int)

setBeanName

public void setBeanName(String name)

Description copied from interface: BeanNameAware

Set the name of the bean in the bean factory that created this bean.

Invoked after population of normal bean properties but before an init callback such as InitializingBean.afterPropertiesSet() or a custom init-method.

Specified by:

setBeanName in interface BeanNameAware

Parameters:

name - the name of the bean in the factory. Note that this name is the actual bean name used in the factory, which may differ from the originally specified name: in particular for inner bean names, the actual bean name might have been made unique through appending "#..." suffixes. Use the BeanFactoryUtils.originalBeanName(String) method to extract the original bean name (without suffix), if desired.

setApplicationContext

public void setApplicationContext(ApplicationContext applicationContext)

Description copied from interface: ApplicationContextAware

Set the ApplicationContext that this object runs in. Normally this call will be used to initialize the object.

Invoked after population of normal bean properties but before an init callback such as InitializingBean.afterPropertiesSet() or a custom init-method. Invoked after ResourceLoaderAware.setResourceLoader(org.springframework.core.io.ResourceLoader), ApplicationEventPublisherAware.setApplicationEventPublisher(org.springframework.context.ApplicationEventPublisher) and MessageSourceAware, if applicable.

Specified by:

setApplicationContext in interface ApplicationContextAware

Parameters:

applicationContext - the ApplicationContext object to be used by this object

See Also:

• BeanInitializationException

afterPropertiesSet

public void afterPropertiesSet()

Calls initialize() after the container applied all property values.

Specified by:

afterPropertiesSet in interface InitializingBean

See Also:

• initialize()

initialize

public void initialize()

Set up the ExecutorService.

initializeExecutor

protected abstract ExecutorService initializeExecutor(ThreadFactory threadFactory,
 RejectedExecutionHandler rejectedExecutionHandler)

Create the target ExecutorService instance. Called by afterPropertiesSet.

Parameters:

threadFactory - the ThreadFactory to use

rejectedExecutionHandler - the RejectedExecutionHandler to use

Returns:

a new ExecutorService instance

See Also:

• afterPropertiesSet()

destroy

public void destroy()

Calls shutdown when the BeanFactory destroys the executor instance.

Specified by:

destroy in interface DisposableBean

See Also:

• shutdown()

initiateShutdown

public void initiateShutdown()

Initiate a shutdown on the underlying ExecutorService, rejecting further task submissions.

The executor will not accept further tasks and will prevent further scheduling of periodic tasks, letting existing tasks complete still. This step is non-blocking and can be applied as an early shutdown signal before following up with a full shutdown() call later on.

Automatically called for early shutdown signals on context close. Can be manually called as well, in particular outside a container.

Since:

6.1

See Also:

• shutdown()
• ExecutorService.shutdown()

shutdown

public void shutdown()

Perform a full shutdown on the underlying ExecutorService, according to the corresponding configuration settings.

This step potentially blocks for the configured termination period, waiting for remaining tasks to complete. For an early shutdown signal to not accept further tasks, call initiateShutdown() first.

See Also:

• setWaitForTasksToCompleteOnShutdown(boolean)
• setAwaitTerminationMillis(long)
• ExecutorService.shutdown()
• ExecutorService.shutdownNow()
• ExecutorService.awaitTermination(long, java.util.concurrent.TimeUnit)

cancelRemainingTask

protected void cancelRemainingTask(Runnable task)

Cancel the given remaining task which never commenced execution, as returned from ExecutorService.shutdownNow().

Parameters:

task - the task to cancel (typically a RunnableFuture)

Since:

5.0.5

See Also:

• shutdown()
• Future.cancel(boolean)

start

public void start()

Resume this executor if paused before (otherwise a no-op).

Specified by:

start in interface Lifecycle

Since:

6.1

See Also:

• SmartLifecycle.isAutoStartup()

stop

public void stop()

Pause this executor, not waiting for tasks to complete.

Specified by:

stop in interface Lifecycle

Since:

6.1

See Also:

• SmartLifecycle.stop(Runnable)
• DisposableBean.destroy()

stop

public void stop(Runnable callback)

Pause this executor, triggering the given callback once all currently executing tasks have completed.

Specified by:

stop in interface SmartLifecycle

Since:

6.1

See Also:

• Lifecycle.stop()
• SmartLifecycle.getPhase()

isRunning

public boolean isRunning()

Check whether this executor is not paused and has not been shut down either.

Specified by:

isRunning in interface Lifecycle

Returns:

whether the component is currently running

Since:

6.1

See Also:

• start()
• stop()

beforeExecute

protected void beforeExecute(Thread thread,
 Runnable task)

A before-execute callback for framework subclasses to delegate to (for start/stop handling), and possibly also for custom subclasses to extend (making sure to call this implementation as well).

Parameters:

thread - the thread to run the task

task - the task to be executed

Since:

6.1

See Also:

• ThreadPoolExecutor.beforeExecute(Thread, Runnable)

afterExecute

protected void afterExecute(Runnable task,
 @Nullable
 Throwable ex)

An after-execute callback for framework subclasses to delegate to (for start/stop handling), and possibly also for custom subclasses to extend (making sure to call this implementation as well).

Parameters:

task - the task that has been executed

ex - the exception thrown during execution, if any

Since:

6.1

See Also:

• ThreadPoolExecutor.afterExecute(Runnable, Throwable)

onApplicationEvent

public void onApplicationEvent(ContextClosedEvent event)

ContextClosedEvent handler for initiating an early shutdown.

Specified by:

onApplicationEvent in interface ApplicationListener<ContextClosedEvent>

Parameters:

event - the event to respond to

Since:

6.1

See Also:

• initiateShutdown()

initiateEarlyShutdown

protected void initiateEarlyShutdown()

Early shutdown signal: do not trigger further tasks, let existing tasks complete before hitting the actual destruction step in the shutdown() method. This goes along with a coordinated lifecycle stop phase.

Called from onApplicationEvent(ContextClosedEvent) if no indications for a late shutdown have been determined, that is, if the "acceptTasksAfterContextClose and "waitForTasksToCompleteOnShutdown" flags have not been set.

The default implementation calls initiateShutdown().

Since:

6.1.4

See Also:

• initiateShutdown()