org.springframework.scheduling.concurrent

Class ScheduledExecutorFactoryBean

java.lang.Object

org.springframework.util.CustomizableThreadCreator

org.springframework.scheduling.concurrent.CustomizableThreadFactory

org.springframework.scheduling.concurrent.ExecutorConfigurationSupport

org.springframework.scheduling.concurrent.ScheduledExecutorFactoryBean

All Implemented Interfaces:

Serializable, ThreadFactory, org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanNameAware, org.springframework.beans.factory.DisposableBean, org.springframework.beans.factory.FactoryBean<ScheduledExecutorService>, org.springframework.beans.factory.InitializingBean

public class ScheduledExecutorFactoryBean
extends ExecutorConfigurationSupport
implements org.springframework.beans.factory.FactoryBean<ScheduledExecutorService>

FactoryBean that sets up a JDK 1.5 ScheduledExecutorService (by default: a ScheduledThreadPoolExecutor) and exposes it for bean references.

Allows for registration of ScheduledExecutorTasks, automatically starting the ScheduledExecutorService on initialization and cancelling 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.

Note that 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 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".

Since:

2.0

Author:

Juergen Hoeller

See Also:

setPoolSize(int), ExecutorConfigurationSupport.setThreadFactory(java.util.concurrent.ThreadFactory), ScheduledExecutorTask, ScheduledExecutorService, ScheduledThreadPoolExecutor, Serialized Form

Field Summary

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

logger

Constructor Summary

Constructors

Constructor and Description
ScheduledExecutorFactoryBean()

Method Summary

Methods

Modifier and Type	Method and Description
protected ScheduledExecutorService	createExecutor(int poolSize, ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) Create a new ScheduledExecutorService instance.
ScheduledExecutorService	getObject()
Class<? extends ScheduledExecutorService>	getObjectType()
protected Runnable	getRunnableToSchedule(ScheduledExecutorTask task) Determine the actual Runnable to schedule for the given task.
protected ExecutorService	initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) Create the target ExecutorService instance.
boolean	isSingleton()
protected void	registerTasks(ScheduledExecutorTask[] tasks, ScheduledExecutorService executor) Register the specified ScheduledExecutorTasks on the given ScheduledExecutorService.
void	setContinueScheduledExecutionAfterException(boolean continueScheduledExecutionAfterException) Specify whether to continue the execution of a scheduled task after it threw an exception.
void	setExposeUnconfigurableExecutor(boolean exposeUnconfigurableExecutor) Specify whether this FactoryBean should expose an unconfigurable decorator for the created executor.
void	setPoolSize(int poolSize) Set the ScheduledExecutorService's pool size.
void	setScheduledExecutorTasks(ScheduledExecutorTask... scheduledExecutorTasks) Register a list of ScheduledExecutorTask objects with the ScheduledExecutorService that this FactoryBean creates.

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

afterPropertiesSet, destroy, initialize, setAwaitTerminationSeconds, 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

Constructor Detail

ScheduledExecutorFactoryBean

public ScheduledExecutorFactoryBean()

Method Detail

setPoolSize

public void setPoolSize(int poolSize)

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

setScheduledExecutorTasks

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:

ScheduledExecutorService.schedule(java.lang.Runnable, long, java.util.concurrent.TimeUnit), ScheduledExecutorService.scheduleWithFixedDelay(java.lang.Runnable, long, long, java.util.concurrent.TimeUnit), ScheduledExecutorService.scheduleAtFixedRate(java.lang.Runnable, long, long, java.util.concurrent.TimeUnit)

setContinueScheduledExecutionAfterException

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 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:

ScheduledExecutorService.scheduleAtFixedRate(java.lang.Runnable, long, long, java.util.concurrent.TimeUnit)

setExposeUnconfigurableExecutor

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:

Executors.unconfigurableScheduledExecutorService(java.util.concurrent.ScheduledExecutorService)

initializeExecutor

protected ExecutorService initializeExecutor(ThreadFactory threadFactory,
                                 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 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 - the specified pool size

threadFactory - the ThreadFactory to use

rejectedExecutionHandler - the RejectedExecutionHandler to use

Returns:

a new ScheduledExecutorService instance

See Also:

ExecutorConfigurationSupport.afterPropertiesSet(), ScheduledThreadPoolExecutor

registerTasks

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

Register the specified ScheduledExecutorTasks on the given ScheduledExecutorService.

Parameters:

tasks - the specified ScheduledExecutorTasks (never empty)

executor - the ScheduledExecutorService to register the tasks on.

getRunnableToSchedule

protected Runnable getRunnableToSchedule(ScheduledExecutorTask task)

Determine the actual Runnable to schedule for the given task.

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

Parameters:

task - the ScheduledExecutorTask to schedule

Returns:

the actual Runnable to schedule (may be a decorator)

getObject

public ScheduledExecutorService getObject()

Specified by:

getObject in interface org.springframework.beans.factory.FactoryBean<ScheduledExecutorService>

getObjectType

public Class<? extends ScheduledExecutorService> getObjectType()

Specified by:

getObjectType in interface org.springframework.beans.factory.FactoryBean<ScheduledExecutorService>

isSingleton

public boolean isSingleton()

Specified by:

isSingleton in interface org.springframework.beans.factory.FactoryBean<ScheduledExecutorService>