程序包 cn.taketoday.scheduling.concurrent

类 ThreadPoolTaskExecutor

java.lang.Object
cn.taketoday.util.CustomizableThreadCreator
cn.taketoday.scheduling.concurrent.CustomizableThreadFactory
cn.taketoday.scheduling.concurrent.ExecutorConfigurationSupport
cn.taketoday.scheduling.concurrent.ThreadPoolTaskExecutor
所有已实现的接口:
Aware, BeanNameAware, DisposableBean, InitializingBean, cn.taketoday.core.task.AsyncListenableTaskExecutor, cn.taketoday.core.task.AsyncTaskExecutor, cn.taketoday.core.task.TaskExecutor, SchedulingTaskExecutor, Serializable, Executor, ThreadFactory
public class ThreadPoolTaskExecutor extends ExecutorConfigurationSupport implements cn.taketoday.core.task.AsyncListenableTaskExecutor, SchedulingTaskExecutor
JavaBean that allows for configuring a ThreadPoolExecutor in bean style (through its "corePoolSize", "maxPoolSize", "keepAliveSeconds", "queueCapacity" properties) and exposing it as a Framework TaskExecutor. This class is also well suited for management and monitoring (e.g. through JMX), providing several useful attributes: "corePoolSize", "maxPoolSize", "keepAliveSeconds" (all supporting updates at runtime); "poolSize", "activeCount" (for introspection only).

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).

NOTE: This class implements TaskExecutor interface as well as the Executor interface, with the former being the primary interface, the other just serving as secondary convenience. For this reason, the exception handling follows the TaskExecutor contract rather than the Executor contract, in particular regarding the TaskRejectedException.

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. To expose such a raw Executor as a Framework TaskExecutor, simply wrap it with a ConcurrentTaskExecutor adapter.

从以下版本开始:
4.0
作者:
Juergen Hoeller
另请参阅:

  • 构造器详细资料

    • ThreadPoolTaskExecutor

      public ThreadPoolTaskExecutor()

  • 方法详细资料

    • 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.

    • getCorePoolSize

      public int getCorePoolSize()
      Return the ThreadPoolExecutor's core pool size.

    • 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.

    • getMaxPoolSize

      public int getMaxPoolSize()
      Return the ThreadPoolExecutor's maximum pool size.

    • 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.

    • getKeepAliveSeconds

      public int getKeepAliveSeconds()
      Return the ThreadPoolExecutor's keep-alive seconds.

    • 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.

      另请参阅:

    • getQueueCapacity

      public int getQueueCapacity()
      Return the capacity for the ThreadPoolExecutor's BlockingQueue.
      另请参阅:

    • 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".

      另请参阅:

    • setPrestartAllCoreThreads

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

      Default is "false".

      另请参阅:

    • setTaskDecorator

      public void setTaskDecorator(cn.taketoday.core.task.TaskDecorator taskDecorator)
      Specify a custom TaskDecorator to be applied to any Runnable about to be executed.

      Note that such a decorator is not necessarily being applied to the user-supplied Runnable/Callable but rather to the actual execution callback (which may be a wrapper around the user-supplied task).

      The primary use case is to set some execution context around the task's invocation, or to provide some monitoring/statistics for task execution.

      NOTE: Exception handling in TaskDecorator implementations is limited to plain Runnable execution via execute calls. In case of #submit calls, the exposed Runnable will be a FutureTask which does not propagate any exceptions; you might have to cast it and call Future#get to evaluate exceptions. See the ThreadPoolExecutor#afterExecute javadoc for an example of how to access exceptions in such a Future case.

    • initializeExecutor

      protected ExecutorService initializeExecutor(ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler)
      Note: This method exposes an ExecutorService to its base class but stores the actual ThreadPoolExecutor handle internally. Do not override this method for replacing the executor, rather just for decorating its ExecutorService handle or storing custom state.
      指定者:
      initializeExecutor 在类中 ExecutorConfigurationSupport
      参数:
      threadFactory - the ThreadFactory to use
      rejectedExecutionHandler - the RejectedExecutionHandler to use
      返回:
      a new ExecutorService instance
      另请参阅:

    • 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.

      参数:
      queueCapacity - the specified queue capacity
      返回:
      the BlockingQueue instance
      另请参阅:

    • getThreadPoolExecutor

      public ThreadPoolExecutor getThreadPoolExecutor() throws IllegalStateException
      Return the underlying ThreadPoolExecutor for native access.
      返回:
      the underlying ThreadPoolExecutor (never null)
      抛出:
      IllegalStateException - if the ThreadPoolTaskExecutor hasn't been initialized yet

    • getPoolSize

      public int getPoolSize()
      Return the current pool size.
      另请参阅:

    • getQueueSize

      public int getQueueSize()
      Return the current queue size.
      另请参阅:

    • getActiveCount

      public int getActiveCount()
      Return the number of currently active threads.
      另请参阅:

    • execute

      public void execute(Runnable task)
      指定者:
      execute 在接口中 Executor
      指定者:
      execute 在接口中 cn.taketoday.core.task.TaskExecutor

    • execute

      public void execute(Runnable task, long startTimeout)
      指定者:
      execute 在接口中 cn.taketoday.core.task.AsyncTaskExecutor

    • submit

      public Future<?> submit(Runnable task)
      指定者:
      submit 在接口中 cn.taketoday.core.task.AsyncTaskExecutor

    • submit

      public <T> Future<T> submit(Callable<T> task)
      指定者:
      submit 在接口中 cn.taketoday.core.task.AsyncTaskExecutor

    • submitListenable

      public cn.taketoday.util.concurrent.ListenableFuture<?> submitListenable(Runnable task)
      指定者:
      submitListenable 在接口中 cn.taketoday.core.task.AsyncListenableTaskExecutor

    • submitListenable

      public <T> cn.taketoday.util.concurrent.ListenableFuture<T> submitListenable(Callable<T> task)
      指定者:
      submitListenable 在接口中 cn.taketoday.core.task.AsyncListenableTaskExecutor

    • cancelRemainingTask

      protected void cancelRemainingTask(Runnable task)
      从类复制的说明: ExecutorConfigurationSupport
      Cancel the given remaining task which never commended execution, as returned from ExecutorService.shutdownNow().
      覆盖:
      cancelRemainingTask 在类中 ExecutorConfigurationSupport
      参数:
      task - the task to cancel (typically a RunnableFuture)
      另请参阅: