Spring Context 6.1.4 · org.springframework.scheduling.concurrent.ScheduledExecutorFactoryBean

org.springframework.beans.factory.FactoryBean that sets up a java.util.concurrent.ScheduledExecutorService (by default: a java.util.concurrent.ScheduledThreadPoolExecutor) and exposes it for bean references.

Allows for registration of ScheduledExecutorTasks, automatically starting the ScheduledExecutorService on initialization and canceling it on destruction of the context. In scenarios that only require static registration of tasks at startup, there is no need to access the ScheduledExecutorService instance itself in application code at all; ScheduledExecutorFactoryBean is then just being used for lifecycle integration.

For an alternative, you may set up a ScheduledThreadPoolExecutor instance directly using constructor injection, or use a factory method definition that points to the java.util.concurrent.Executors class. This is strongly recommended in particular for common @Bean methods in configuration classes, where this FactoryBean variant would force you to return the FactoryBean type instead of ScheduledExecutorService.

Note that java.util.concurrent.ScheduledExecutorService uses a Runnable instance that is shared between repeated executions, in contrast to Quartz which instantiates a new Job for each execution.

Warning

Runnables submitted via a native java.util.concurrent.ScheduledExecutorService are removed from the execution schedule once they throw an exception. If you would prefer to continue execution after such an exception, switch this FactoryBean's "continueScheduledExecutionAfterException" property to "true".

Field Summary

Modifier and Type	Field and Description
private boolean	continueScheduledExecutionAfterException
private ScheduledExecutorService	exposedExecutor
private boolean	exposeUnconfigurableExecutor
private int	poolSize
private boolean	removeOnCancelPolicy
private ScheduledExecutorTask[]	scheduledExecutorTasks

Inherited from org.springframework.scheduling.concurrent.ExecutorConfigurationSupport:: logger

Constructor Summary

Access	Constructor and Description
public	ScheduledExecutorFactoryBean()

Method Summary

Modifier and Type	Method and Description
protected ScheduledExecutorService	Returns: a new ScheduledExecutorService instance createExecutor(int the specified pool size poolSize, ThreadFactory the ThreadFactory to use threadFactory, RejectedExecutionHandler the RejectedExecutionHandler to use rejectedExecutionHandler) Create a new `ScheduledExecutorService` instance.
public ScheduledExecutorService	getObject() Implements org.springframework.beans.factory.FactoryBean.getObject. Return an instance (possibly shared or independent) of the object managed by this factory.
public Class<? extends ScheduledExecutorService>	getObjectType() Implements org.springframework.beans.factory.FactoryBean.getObjectType. Return the type of object that this FactoryBean creates, or `null` if not known in advance.
protected Runnable	Returns: the actual Runnable to schedule (may be a decorator) getRunnableToSchedule(ScheduledExecutorTask the ScheduledExecutorTask to schedule task) Determine the actual Runnable to schedule for the given task.
protected ExecutorService	initializeExecutor(ThreadFactory the ThreadFactory to use threadFactory, RejectedExecutionHandler the RejectedExecutionHandler to use rejectedExecutionHandler) Implements abstract org.springframework.scheduling.concurrent.ExecutorConfigurationSupport.initializeExecutor. Create the target `java.util.concurrent.ExecutorService` instance.
public boolean	isSingleton() Overrides default org.springframework.beans.factory.FactoryBean.isSingleton. Is the object managed by this factory a singleton?
protected void	registerTasks(ScheduledExecutorTask[] the specified ScheduledExecutorTasks (never empty) tasks, ScheduledExecutorService the ScheduledExecutorService to register the tasks on. executor) Register the specified `ScheduledExecutorTasks` on the given `ScheduledExecutorService`.
public void	setContinueScheduledExecutionAfterException(boolean continueScheduledExecutionAfterException) Specify whether to continue the execution of a scheduled task after it threw an exception.
public void	setExposeUnconfigurableExecutor(boolean exposeUnconfigurableExecutor) Specify whether this FactoryBean should expose an unconfigurable decorator for the created executor.
public void	setPoolSize(int poolSize) Set the ScheduledExecutorService's pool size.
public void	setRemoveOnCancelPolicy(boolean removeOnCancelPolicy) Set the remove-on-cancel mode on `ScheduledThreadPoolExecutor`.
public void	setScheduledExecutorTasks(ScheduledExecutorTask... scheduledExecutorTasks) Register a list of ScheduledExecutorTask objects with the ScheduledExecutorService that this FactoryBean creates.

Field Detail

continueScheduledExecutionAfterException	back to summary
private boolean continueScheduledExecutionAfterException

exposedExecutor	back to summary
private ScheduledExecutorService exposedExecutor Annotations @Nullable

exposeUnconfigurableExecutor	back to summary
private boolean exposeUnconfigurableExecutor

poolSize	back to summary
private int poolSize

removeOnCancelPolicy	back to summary
private boolean removeOnCancelPolicy

scheduledExecutorTasks	back to summary
private ScheduledExecutorTask[] scheduledExecutorTasks Annotations @Nullable

Constructor Detail

ScheduledExecutorFactoryBean	back to summary
public ScheduledExecutorFactoryBean()

Method Detail

createExecutor back to summary

createExecutor	back to summary
protected ScheduledExecutorService createExecutor(int poolSize, ThreadFactory threadFactory, 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:int the specified pool size threadFactory:ThreadFactory the ThreadFactory to use rejectedExecutionHandler:RejectedExecutionHandler the RejectedExecutionHandler to use Returns:ScheduledExecutorService a new ScheduledExecutorService instance See Also `afterPropertiesSet()`, `java.util.concurrent.ScheduledThreadPoolExecutor`

protected ScheduledExecutorService createExecutor(int poolSize, ThreadFactory threadFactory, 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:int: the specified pool size
threadFactory:ThreadFactory: the ThreadFactory to use
rejectedExecutionHandler:RejectedExecutionHandler: the RejectedExecutionHandler to use

Returns:ScheduledExecutorService

a new ScheduledExecutorService instance

getObject back to summary

getObject	back to summary
public ScheduledExecutorService getObject() Implements org.springframework.beans.factory.FactoryBean.getObject. Doc from org.springframework.beans.factory.FactoryBean.getObject. Return an instance (possibly shared or independent) of the object managed by this factory. As with a `BeanFactory`, this allows support for both the Singleton and Prototype design pattern. If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding `FactoryBeanNotInitializedException`. As of Spring 2.0, FactoryBeans are allowed to return `null` objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate. Returns:ScheduledExecutorService an instance of the bean (can be `null`) Annotations @Override @Nullable

public ScheduledExecutorService getObject()

Implements org.springframework.beans.factory.FactoryBean.getObject.

Doc from org.springframework.beans.factory.FactoryBean.getObject.

Return an instance (possibly shared or independent) of the object managed by this factory.

As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding FactoryBeanNotInitializedException.

As of Spring 2.0, FactoryBeans are allowed to return null objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.

Returns:ScheduledExecutorService

an instance of the bean (can be null)

Annotations

@Override
@Nullable

getObjectType back to summary

getObjectType	back to summary
public Class<? extends ScheduledExecutorService> getObjectType() Implements org.springframework.beans.factory.FactoryBean.getObjectType. Doc from org.springframework.beans.factory.FactoryBean.getObjectType. Return the type of object that this FactoryBean creates, or `null` if not known in advance. This allows one to check for specific types of beans without instantiating objects, for example on autowiring. In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too. This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available. Note Autowiring will simply ignore FactoryBeans that return `null` here. Therefore, it is highly recommended to implement this method properly, using the current state of the FactoryBean. Returns:Class<? extends ScheduledExecutorService> the type of object that this FactoryBean creates, or `null` if not known at the time of the call Annotations @Override

public Class<? extends ScheduledExecutorService> getObjectType()

Implements org.springframework.beans.factory.FactoryBean.getObjectType.

Doc from org.springframework.beans.factory.FactoryBean.getObjectType.

Return the type of object that this FactoryBean creates, or null if not known in advance.

This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

Note

Autowiring will simply ignore FactoryBeans that return null here. Therefore, it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Returns:Class<? extends ScheduledExecutorService>

the type of object that this FactoryBean creates, or null if not known at the time of the call

Annotations

@Override

getRunnableToSchedule back to summary

getRunnableToSchedule	back to summary
protected Runnable getRunnableToSchedule(ScheduledExecutorTask task) Determine the actual Runnable to schedule for the given task. Wraps the task's Runnable in a `org.springframework.scheduling.support.DelegatingErrorHandlingRunnable` that will catch and log the Exception. If necessary, it will suppress the Exception according to the `"continueScheduledExecutionAfterException"` flag. Parameters task:ScheduledExecutorTask the ScheduledExecutorTask to schedule Returns:Runnable the actual Runnable to schedule (may be a decorator)

protected Runnable getRunnableToSchedule(ScheduledExecutorTask task)

Determine the actual Runnable to schedule for the given task.

Wraps the task's Runnable in a org.springframework.scheduling.support.DelegatingErrorHandlingRunnable that will catch and log the Exception. If necessary, it will suppress the Exception according to the "continueScheduledExecutionAfterException" flag.

Parameters

task:ScheduledExecutorTask: the ScheduledExecutorTask to schedule

Returns:Runnable

the actual Runnable to schedule (may be a decorator)

initializeExecutor back to summary

initializeExecutor	back to summary
protected ExecutorService initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) Implements abstract org.springframework.scheduling.concurrent.ExecutorConfigurationSupport.initializeExecutor. Doc from org.springframework.scheduling.concurrent.ExecutorConfigurationSupport.initializeExecutor. Create the target `java.util.concurrent.ExecutorService` instance. Called by `afterPropertiesSet`. Parameters threadFactory:ThreadFactory the ThreadFactory to use rejectedExecutionHandler:RejectedExecutionHandler the RejectedExecutionHandler to use Returns:ExecutorService a new ExecutorService instance Annotations @Override

protected ExecutorService initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler)

Implements abstract org.springframework.scheduling.concurrent.ExecutorConfigurationSupport.initializeExecutor.

Doc from org.springframework.scheduling.concurrent.ExecutorConfigurationSupport.initializeExecutor.

Create the target java.util.concurrent.ExecutorService instance. Called by afterPropertiesSet.

Parameters

threadFactory:ThreadFactory: the ThreadFactory to use
rejectedExecutionHandler:RejectedExecutionHandler: the RejectedExecutionHandler to use

Returns:ExecutorService

a new ExecutorService instance

Annotations

@Override

isSingleton back to summary

isSingleton	back to summary
public boolean isSingleton() Overrides default org.springframework.beans.factory.FactoryBean.isSingleton. Doc from org.springframework.beans.factory.FactoryBean.isSingleton. Is the object managed by this factory a singleton? That is, will `getObject()` always return the same object (a reference that can be cached)? Note If a FactoryBean indicates to hold a singleton object, the object returned from `getObject()` might get cached by the owning BeanFactory. Hence, do not return `true` unless the FactoryBean always exposes the same reference. The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there. Note This method returning `false` does not necessarily indicate that returned objects are independent instances. An implementation of the extended `SmartFactoryBean` interface may explicitly indicate independent instances through its `SmartFactoryBean#isPrototype()` method. Plain `FactoryBean` implementations which do not implement this extended interface are simply assumed to always return independent instances if the `isSingleton()` implementation returns `false`. The default implementation returns `true`, since a `FactoryBean` typically manages a singleton instance. Returns:boolean whether the exposed object is a singleton Annotations @Override

public boolean isSingleton()

Overrides default org.springframework.beans.factory.FactoryBean.isSingleton.

Doc from org.springframework.beans.factory.FactoryBean.isSingleton.

Is the object managed by this factory a singleton? That is, will getObject() always return the same object (a reference that can be cached)?

Note

If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

Note

This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean#isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

The default implementation returns true, since a FactoryBean typically manages a singleton instance.

Returns:boolean

whether the exposed object is a singleton

Annotations

@Override

registerTasks back to summary

registerTasks	back to summary
protected void registerTasks(ScheduledExecutorTask[] tasks, ScheduledExecutorService executor) Register the specified `ScheduledExecutorTasks` on the given `ScheduledExecutorService`. Parameters tasks:ScheduledExecutorTask[] the specified ScheduledExecutorTasks (never empty) executor:ScheduledExecutorService the ScheduledExecutorService to register the tasks on.

protected void registerTasks(ScheduledExecutorTask[] tasks, ScheduledExecutorService executor)

Parameters

tasks:ScheduledExecutorTask[]: the specified ScheduledExecutorTasks (never empty)
executor:ScheduledExecutorService: the ScheduledExecutorService to register the tasks on.

setContinueScheduledExecutionAfterException back to summary

setContinueScheduledExecutionAfterException	back to summary
public void setContinueScheduledExecutionAfterException(boolean continueScheduledExecutionAfterException) Specify whether to continue the execution of a scheduled task after it threw an exception. Default is "false", matching the native behavior of a `java.util.concurrent.ScheduledExecutorService`. Switch this flag to "true" for exception-proof execution of each task, continuing scheduled execution as in the case of successful execution. See Also `java.util.concurrent.ScheduledExecutorService#scheduleAtFixedRate`

public void setContinueScheduledExecutionAfterException(boolean continueScheduledExecutionAfterException)

Specify whether to continue the execution of a scheduled task after it threw an exception.

Default is "false", matching the native behavior of a java.util.concurrent.ScheduledExecutorService. Switch this flag to "true" for exception-proof execution of each task, continuing scheduled execution as in the case of successful execution.

See Also: java.util.concurrent.ScheduledExecutorService#scheduleAtFixedRate

setExposeUnconfigurableExecutor back to summary

setExposeUnconfigurableExecutor	back to summary
public void setExposeUnconfigurableExecutor(boolean exposeUnconfigurableExecutor) Specify whether this FactoryBean should expose an unconfigurable decorator for the created executor. Default is "false", exposing the raw executor as bean reference. Switch this flag to "true" to strictly prevent clients from modifying the executor's configuration. See Also `java.util.concurrent.Executors#unconfigurableScheduledExecutorService`

public void setExposeUnconfigurableExecutor(boolean exposeUnconfigurableExecutor)

Specify whether this FactoryBean should expose an unconfigurable decorator for the created executor.

Default is "false", exposing the raw executor as bean reference. Switch this flag to "true" to strictly prevent clients from modifying the executor's configuration.

See Also: java.util.concurrent.Executors#unconfigurableScheduledExecutorService

setPoolSize	back to summary
public void setPoolSize(int poolSize) Set the ScheduledExecutorService's pool size. Default is 1.

setRemoveOnCancelPolicy back to summary

setRemoveOnCancelPolicy	back to summary
public void setRemoveOnCancelPolicy(boolean removeOnCancelPolicy) Set the remove-on-cancel mode on `ScheduledThreadPoolExecutor`. Default is `false`. If set to `true`, the target executor will be switched into remove-on-cancel mode (if possible, with a soft fallback otherwise).

public void setRemoveOnCancelPolicy(boolean removeOnCancelPolicy)

Set the remove-on-cancel mode on ScheduledThreadPoolExecutor.

Default is false. If set to true, the target executor will be switched into remove-on-cancel mode (if possible, with a soft fallback otherwise).

setScheduledExecutorTasks back to summary

setScheduledExecutorTasks	back to summary
public void setScheduledExecutorTasks(ScheduledExecutorTask... scheduledExecutorTasks) Register a list of ScheduledExecutorTask objects with the ScheduledExecutorService that this FactoryBean creates. Depending on each ScheduledExecutorTask's settings, it will be registered via one of ScheduledExecutorService's schedule methods. See Also `java.util.concurrent.ScheduledExecutorService#schedule(java.lang.Runnable, long, java.util.concurrent.TimeUnit)`, `java.util.concurrent.ScheduledExecutorService#scheduleWithFixedDelay(java.lang.Runnable, long, long, java.util.concurrent.TimeUnit)`, `java.util.concurrent.ScheduledExecutorService#scheduleAtFixedRate(java.lang.Runnable, long, long, java.util.concurrent.TimeUnit)`

public void setScheduledExecutorTasks(ScheduledExecutorTask... scheduledExecutorTasks)

Register a list of ScheduledExecutorTask objects with the ScheduledExecutorService that this FactoryBean creates. Depending on each ScheduledExecutorTask's settings, it will be registered via one of ScheduledExecutorService's schedule methods.

See Also: java.util.concurrent.ScheduledExecutorService#schedule(java.lang.Runnable, long, java.util.concurrent.TimeUnit), java.util.concurrent.ScheduledExecutorService#scheduleWithFixedDelay(java.lang.Runnable, long, long, java.util.concurrent.TimeUnit), java.util.concurrent.ScheduledExecutorService#scheduleAtFixedRate(java.lang.Runnable, long, long, java.util.concurrent.TimeUnit)

public Class ScheduledExecutorFactoryBean

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail