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FlexDoc/Javadoc 2.0 Demo Java Doc |
Class ThreadPoolExecutor.DiscardOldestPolicy
java.util.concurrent.ThreadPoolExecutor.DiscardOldestPolicy
All Implemented Interfaces:
Enclosing class:
public static class 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:
new RejectedExecutionHandler() {
public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
Runnable dropped = e.getQueue().poll();
if (dropped instanceof Future<?>) {
((Future<?>)dropped).cancel(false);
// also consider logging the failure
}
e.execute(r); // retry
}}
Constructor Summary |
Creates a DiscardOldestPolicy for the given executor.
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Method Summary |
void |
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.
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Methods inherited from class java.lang. Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
public DiscardOldestPolicy |
() |
Creates a DiscardOldestPolicy for the given executor.
public void rejectedExecution |
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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:
Parameters:
r - the runnable task requested to be executed
e - the executor attempting to execute this task
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FlexDoc/Javadoc 2.0 Demo Java Doc |
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