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

The default configuration is a core pool size of 1, with unlimited max pool size and unlimited queue capacity. This is roughly equivalent to Executors.newSingleThreadExecutor(), sharing a single thread for all tasks. Setting "queueCapacity" to 0 mimics Executors.newCachedThreadPool(), with immediate scaling of threads in the pool to a potentially very high number. Consider also setting a "maxPoolSize" at that point, as well as possibly a higher "corePoolSize" (see also the "allowCoreThreadTimeOut" mode of scaling).

For an alternative, you may set up a ThreadPoolExecutor instance directly using constructor injection, or use a factory method definition that points to the 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 the actual Executor type.

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

Since:
3.0
Author:
Juergen Hoeller
See Also:

  • Constructor Details

    • ThreadPoolExecutorFactoryBean

      public ThreadPoolExecutorFactoryBean()

  • Method Details

    • setCorePoolSize

      public void setCorePoolSize(int corePoolSize)
      Set the ThreadPoolExecutor's core pool size. Default is 1.

    • setMaxPoolSize

      public void setMaxPoolSize(int maxPoolSize)
      Set the ThreadPoolExecutor's maximum pool size. Default is Integer.MAX_VALUE.

    • setKeepAliveSeconds

      public void setKeepAliveSeconds(int keepAliveSeconds)
      Set the ThreadPoolExecutor's keep-alive seconds. Default is 60.

    • 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".

      See Also:

    • setPrestartAllCoreThreads

      public void setPrestartAllCoreThreads(boolean prestartAllCoreThreads)
      Specify whether to start all core threads, causing them to idly wait for work.

      Default is "false".

      Since:
      5.3.14
      See Also:

    • 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:

    • 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:

    • 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:

    • createExecutor

      protected ThreadPoolExecutor createExecutor(int corePoolSize, int maxPoolSize, int keepAliveSeconds, BlockingQueue<Runnable> queue, ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler)
      Create a new instance of ThreadPoolExecutor or a subclass thereof.

      The default implementation creates a standard ThreadPoolExecutor. Can be overridden to provide custom ThreadPoolExecutor subclasses.

      Parameters:
      corePoolSize - the specified core pool size
      maxPoolSize - the specified maximum pool size
      keepAliveSeconds - the specified keep-alive time in seconds
      queue - the BlockingQueue to use
      threadFactory - the ThreadFactory to use
      rejectedExecutionHandler - the RejectedExecutionHandler to use
      Returns:
      a new ThreadPoolExecutor instance
      See Also:

    • 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:

    • getObject

      @Nullable public ExecutorService getObject()
      Specified by:
      getObject in interface org.springframework.beans.factory.FactoryBean<ExecutorService>

    • 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>