ThreadPoolExecutor.DiscardOldestPolicy (Java SE 12 & JDK 12 )

java.lang.Object
- java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy

All Implemented Interfaces:

RejectedExecutionHandler

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

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 declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DiscardOldestPolicy
```
public DiscardOldestPolicy()
```
    Creates a DiscardOldestPolicy for the given executor.
- Method Detail
  - rejectedExecution
```
public 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.
    
    Specified by:
    
    rejectedExecution in interface RejectedExecutionHandler
    
    Parameters:
    
    r - the runnable task requested to be executed
    
    e - the executor attempting to execute this task