Added in API level 1

DiscardOldestPolicy

open class DiscardOldestPolicy : RejectedExecutionHandler
kotlin.Any
   ↳ java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy

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. This policy is rarely useful in cases where other threads may be waiting for tasks to terminate, or failures must be recorded. Instead consider using a handler of the form:

<code>new RejectedExecutionHandler() {
    public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
      Runnable dropped = e.getQueue().poll();
      if (dropped instanceof Future&lt;?&gt;) {
        ((Future&lt;?&gt;)dropped).cancel(false);
        // also consider logging the failure
      }
      e.execute(r);  // retry
  }}</code>

Summary

Public constructors

Creates a DiscardOldestPolicy for the given executor.

Public methods
open Unit

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.

Public constructors

DiscardOldestPolicy

Added in API level 1
DiscardOldestPolicy()

Creates a DiscardOldestPolicy for the given executor.

Public methods

rejectedExecution

Added in API level 1
open fun rejectedExecution(
    r: Runnable!,
    e: ThreadPoolExecutor!
): Unit

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.

Parameters
r Runnable!: the runnable task requested to be executed
executor the executor attempting to execute this task
e ThreadPoolExecutor!: the executor attempting to execute this task
Exceptions
java.util.concurrent.RejectedExecutionException if there is no remedy