Spring Framework

org.springframework.scheduling.concurrent
Class ForkJoinPoolFactoryBean

java.lang.Object
  extended by org.springframework.scheduling.concurrent.ForkJoinPoolFactoryBean
All Implemented Interfaces:
DisposableBean, FactoryBean<java.util.concurrent.ForkJoinPool>, InitializingBean

public class ForkJoinPoolFactoryBean
extends java.lang.Object
implements FactoryBean<java.util.concurrent.ForkJoinPool>, InitializingBean, DisposableBean

A Spring FactoryBean that builds and exposes a preconfigured ForkJoinPool. May be used on Java 7 as well as on Java 6 with jsr166.jar on the classpath (ideally on the VM bootstrap classpath).

For details on the ForkJoinPool API and its use with RecursiveActions, see the JDK 7 javadoc.

jsr166.jar, containing java.util.concurrent updates for Java 6, can be obtained from the concurrency interest website.

Since:
3.1
Author:
Juergen Hoeller

Constructor Summary
ForkJoinPoolFactoryBean()
           
 
Method Summary
 void afterPropertiesSet()
          Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
 void destroy()
          Invoked by a BeanFactory on destruction of a singleton.
 java.util.concurrent.ForkJoinPool getObject()
          Return an instance (possibly shared or independent) of the object managed by this factory.
 java.lang.Class<?> getObjectType()
          Return the type of object that this FactoryBean creates, or null if not known in advance.
 boolean isSingleton()
          Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?
 void setAsyncMode(boolean asyncMode)
          Specify whether to establish a local first-in-first-out scheduling mode for forked tasks that are never joined.
 void setParallelism(int parallelism)
          Specify the parallelism level.
 void setThreadFactory(java.util.concurrent.ForkJoinPool.ForkJoinWorkerThreadFactory threadFactory)
          Set the factory for creating new ForkJoinWorkerThreads.
 void setUncaughtExceptionHandler(java.lang.Thread.UncaughtExceptionHandler uncaughtExceptionHandler)
          Set the handler for internal worker threads that terminate due to unrecoverable errors encountered while executing tasks.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ForkJoinPoolFactoryBean

public ForkJoinPoolFactoryBean()
Method Detail

setParallelism

public void setParallelism(int parallelism)
Specify the parallelism level. Default is Runtime.availableProcessors().


setThreadFactory

public void setThreadFactory(java.util.concurrent.ForkJoinPool.ForkJoinWorkerThreadFactory threadFactory)
Set the factory for creating new ForkJoinWorkerThreads. Default is ForkJoinPool.defaultForkJoinWorkerThreadFactory.


setUncaughtExceptionHandler

public void setUncaughtExceptionHandler(java.lang.Thread.UncaughtExceptionHandler uncaughtExceptionHandler)
Set the handler for internal worker threads that terminate due to unrecoverable errors encountered while executing tasks. Default is none.


setAsyncMode

public void setAsyncMode(boolean asyncMode)
Specify whether to establish a local first-in-first-out scheduling mode for forked tasks that are never joined. This mode (asyncMode = true) may be more appropriate than the default locally stack-based mode in applications in which worker threads only process event-style asynchronous tasks. Default is false.


afterPropertiesSet

public void afterPropertiesSet()
Description copied from interface: InitializingBean
Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:
afterPropertiesSet in interface InitializingBean

getObject

public java.util.concurrent.ForkJoinPool getObject()
Description copied from interface: FactoryBean
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.

Specified by:
getObject in interface FactoryBean<java.util.concurrent.ForkJoinPool>
Returns:
an instance of the bean (can be null)
See Also:
FactoryBeanNotInitializedException

getObjectType

public java.lang.Class<?> getObjectType()
Description copied from interface: FactoryBean
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.

Specified by:
getObjectType in interface FactoryBean<java.util.concurrent.ForkJoinPool>
Returns:
the type of object that this FactoryBean creates, or null if not known at the time of the call
See Also:
ListableBeanFactory.getBeansOfType(java.lang.Class)

isSingleton

public boolean isSingleton()
Description copied from interface: FactoryBean
Is the object managed by this factory a singleton? That is, will FactoryBean.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.

Specified by:
isSingleton in interface FactoryBean<java.util.concurrent.ForkJoinPool>
Returns:
whether the exposed object is a singleton
See Also:
FactoryBean.getObject(), SmartFactoryBean.isPrototype()

destroy

public void destroy()
Description copied from interface: DisposableBean
Invoked by a BeanFactory on destruction of a singleton.

Specified by:
destroy in interface DisposableBean

Spring Framework