RejectedExecutionHandlerThreadPoolExecutorpublic static class ThreadPoolExecutor.DiscardOldestPolicy extends Object implements RejectedExecutionHandler
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 | Description |
|---|---|
DiscardOldestPolicy() |
Creates a DiscardOldestPolicy for the given executor. |
| Modifier and Type | Method | Description |
|---|---|---|
void |
rejectedExecution |
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 DiscardOldestPolicy()
DiscardOldestPolicy for the given executor.public void rejectedExecution(Runnable r, ThreadPoolExecutor e)
rejectedExecution in interface RejectedExecutionHandler
r - the runnable task requested to be executede - the executor attempting to execute this task
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/util/concurrent/ThreadPoolExecutor.DiscardOldestPolicy.html