org.springframework.scheduling.concurrent

Class ThreadPoolExecutorFactoryBean

java.lang.Object

org.springframework.util.CustomizableThreadCreator

org.springframework.scheduling.concurrent.CustomizableThreadFactory

org.springframework.scheduling.concurrent.ExecutorConfigurationSupport

org.springframework.scheduling.concurrent.ThreadPoolExecutorFactoryBean

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<ExecutorService>, org.springframework.beans.factory.InitializingBean

public class ThreadPoolExecutorFactoryBean
extends ExecutorConfigurationSupport
implements org.springframework.beans.factory.FactoryBean<ExecutorService>, org.springframework.beans.factory.InitializingBean, org.springframework.beans.factory.DisposableBean

JavaBean that allows for configuring a JDK 1.5 ThreadPoolExecutor in bean style (through its "corePoolSize", "maxPoolSize", "keepAliveSeconds", "queueCapacity" properties) and exposing it as a bean reference of its native ExecutorService type.

For an alternative, you may set up a ThreadPoolExecutor instance directly using constructor injection, or use a factory method definition that points to the JDK 1.5 Executors class.

If you need a timing-based ScheduledExecutorService instead, consider ScheduledExecutorFactoryBean.

Since:

3.0

Author:

Juergen Hoeller

See Also:

ExecutorService, Executors, ThreadPoolExecutor, Serialized Form

Field Summary

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

logger

Constructor Summary

Constructors

Constructor and Description
ThreadPoolExecutorFactoryBean()

Method Summary

Methods

Modifier and Type	Method and Description
protected BlockingQueue<Runnable>	createQueue(int queueCapacity) Create the BlockingQueue to use for the ThreadPoolExecutor.
ExecutorService	getObject()
Class<? extends ExecutorService>	getObjectType()
protected ExecutorService	initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) Create the target ExecutorService instance.
boolean	isSingleton()
void	setAllowCoreThreadTimeOut(boolean allowCoreThreadTimeOut) Specify whether to allow core threads to time out.
void	setCorePoolSize(int corePoolSize) Set the ThreadPoolExecutor's core pool size.
void	setExposeUnconfigurableExecutor(boolean exposeUnconfigurableExecutor) Specify whether this FactoryBean should expose an unconfigurable decorator for the created executor.
void	setKeepAliveSeconds(int keepAliveSeconds) Set the ThreadPoolExecutor's keep-alive seconds.
void	setMaxPoolSize(int maxPoolSize) Set the ThreadPoolExecutor's maximum pool size.
void	setQueueCapacity(int queueCapacity) Set the capacity for the ThreadPoolExecutor's BlockingQueue.

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

Methods inherited from interface org.springframework.beans.factory.InitializingBean

afterPropertiesSet

Methods inherited from interface org.springframework.beans.factory.DisposableBean

destroy

Constructor Detail

ThreadPoolExecutorFactoryBean

public ThreadPoolExecutorFactoryBean()

Method Detail

setCorePoolSize

public void setCorePoolSize(int corePoolSize)

Set the ThreadPoolExecutor's core pool size. Default is 1.

This setting can be modified at runtime, for example through JMX.

setMaxPoolSize

public void setMaxPoolSize(int maxPoolSize)

Set the ThreadPoolExecutor's maximum pool size. Default is Integer.MAX_VALUE.

This setting can be modified at runtime, for example through JMX.

setKeepAliveSeconds

public void setKeepAliveSeconds(int keepAliveSeconds)

Set the ThreadPoolExecutor's keep-alive seconds. Default is 60.

This setting can be modified at runtime, for example through JMX.

setAllowCoreThreadTimeOut

public void setAllowCoreThreadTimeOut(boolean allowCoreThreadTimeOut)

Specify whether to allow core threads to time out. This enables dynamic growing and shrinking even in combination with a non-zero queue (since the max pool size will only grow once the queue is full).

Default is "false". Note that this feature is only available on Java 6 or above. On Java 5, consider switching to the backport-concurrent version of ThreadPoolTaskExecutor which also supports this feature.

See Also:

ThreadPoolExecutor.allowCoreThreadTimeOut(boolean)

setQueueCapacity

public void setQueueCapacity(int queueCapacity)

Set the capacity for the ThreadPoolExecutor's BlockingQueue. Default is Integer.MAX_VALUE.

Any positive value will lead to a LinkedBlockingQueue instance; any other value will lead to a SynchronousQueue instance.

See Also:

LinkedBlockingQueue, SynchronousQueue

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()

createQueue

protected BlockingQueue<Runnable> createQueue(int queueCapacity)

Create the BlockingQueue to use for the ThreadPoolExecutor.

A LinkedBlockingQueue instance will be created for a positive capacity value; a SynchronousQueue else.

Parameters:

queueCapacity - the specified queue capacity

Returns:

the BlockingQueue instance

See Also:

LinkedBlockingQueue, SynchronousQueue

getObject

public ExecutorService getObject()
                          throws Exception

Specified by:

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

Throws:

Exception

getObjectType

public Class<? extends ExecutorService> getObjectType()

Specified by:

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

isSingleton

public boolean isSingleton()

Specified by:

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