ThreadPoolExecutor.DiscardOldestPolicy (Java SE 9 & JDK 9 ) (original) (raw)

• java.lang.Object

• • java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy

• All Implemented Interfaces:
  [RejectedExecutionHandler](../../../java/util/concurrent/RejectedExecutionHandler.html "interface in java.util.concurrent")
  Enclosing class:
  ThreadPoolExecutor

public static class ThreadPoolExecutor.DiscardOldestPolicy
extends Object
implements RejectedExecutionHandler
A handler for rejected tasks that discards the oldest unhandled request and then retries execute, unless the executor is shut down, in which case the task is discarded.

• • Constructor Summary

  Constructors

  Constructor	Description
  DiscardOldestPolicy​()	Creates a DiscardOldestPolicy for the given executor.

  • Method Summary

  All Methods Instance Methods Concrete Methods

  Modifier and Type	Method	Description
  void	rejectedExecution​(Runnable r,ThreadPoolExecutor e)	Obtains and ignores the next task that the executor would otherwise execute, if one is immediately available, and then retries execution of task r, unless the executor is shut down, in which case task r is instead discarded.

     * ### Methods inherited from class java.lang.[Object](../../../java/lang/Object.html "class in java.lang")  
     `[clone](../../../java/lang/Object.html#clone--), [equals](../../../java/lang/Object.html#equals-java.lang.Object-), [finalize](../../../java/lang/Object.html#finalize--), [getClass](../../../java/lang/Object.html#getClass--), [hashCode](../../../java/lang/Object.html#hashCode--), [notify](../../../java/lang/Object.html#notify--), [notifyAll](../../../java/lang/Object.html#notifyAll--), [toString](../../../java/lang/Object.html#toString--), [wait](../../../java/lang/Object.html#wait--), [wait](../../../java/lang/Object.html#wait-long-), [wait](../../../java/lang/Object.html#wait-long-int-)`

• • Constructor Detail

     * #### DiscardOldestPolicy  
     public DiscardOldestPolicy​()  
     Creates a `DiscardOldestPolicy` for the given executor.  

  • Method Detail

    * #### rejectedExecution  
    public void rejectedExecution​([Runnable](../../../java/lang/Runnable.html "interface in java.lang") r,  
                                  [ThreadPoolExecutor](../../../java/util/concurrent/ThreadPoolExecutor.html "class in java.util.concurrent") e)  
    Obtains and ignores the next task that the executor would otherwise execute, if one is immediately available, and then retries execution of task r, unless the executor is shut down, in which case task r is instead discarded.  
    Specified by:  
    `[rejectedExecution](../../../java/util/concurrent/RejectedExecutionHandler.html#rejectedExecution-java.lang.Runnable-java.util.concurrent.ThreadPoolExecutor-)` in interface `[RejectedExecutionHandler](../../../java/util/concurrent/RejectedExecutionHandler.html "interface in java.util.concurrent")`  
    Parameters:  
    `r` \- the runnable task requested to be executed  
    `e` \- the executor attempting to execute this task

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