Package org.apache.camel.util.concurrent

Class RejectableScheduledThreadPoolExecutor

java.lang.Object

java.util.concurrent.AbstractExecutorService

java.util.concurrent.ThreadPoolExecutor

java.util.concurrent.ScheduledThreadPoolExecutor

org.apache.camel.util.concurrent.RejectableScheduledThreadPoolExecutor

All Implemented Interfaces:

Executor, ExecutorService, ScheduledExecutorService

public class RejectableScheduledThreadPoolExecutor
extends ScheduledThreadPoolExecutor

Scheduled thread pool executor that creates RejectableFutureTask instead of FutureTask when registering new tasks for execution.

Instances of RejectableFutureTask are required to handle ThreadPoolRejectedPolicy.Discard and ThreadPoolRejectedPolicy.DiscardOldest policies correctly, e.g. notify Callable and Runnable tasks when they are rejected. To be notified of rejection tasks have to implement Rejectable interface:

 public class RejectableTask implements Runnable, Rejectable {
     @Override
     public void run() {
         // execute task
     }
     @Override
     public void reject() {
         // do something useful on rejection
     }
 }
 

If the task does not implement Rejectable interface the behavior is exactly the same as with ordinary ScheduledThreadPoolExecutor.

See Also:

RejectableFutureTask, Rejectable, RejectableThreadPoolExecutor

Nested Class Summary

Nested classes/interfaces inherited from class java.util.concurrent.ThreadPoolExecutor

ThreadPoolExecutor.AbortPolicy, ThreadPoolExecutor.CallerRunsPolicy, ThreadPoolExecutor.DiscardOldestPolicy, ThreadPoolExecutor.DiscardPolicy

Constructor Summary

Constructors

Constructor	Description
RejectableScheduledThreadPoolExecutor(int corePoolSize)
RejectableScheduledThreadPoolExecutor(int corePoolSize, RejectedExecutionHandler handler)
RejectableScheduledThreadPoolExecutor(int corePoolSize, ThreadFactory threadFactory)
RejectableScheduledThreadPoolExecutor(int corePoolSize, ThreadFactory threadFactory, RejectedExecutionHandler handler)

Method Summary

Modifier and Type	Method	Description
protected <T> RunnableFuture<T>	newTaskFor(Runnable runnable, T value)
protected <T> RunnableFuture<T>	newTaskFor(Callable<T> callable)
String	toString()

Methods inherited from class java.util.concurrent.ScheduledThreadPoolExecutor

decorateTask, decorateTask, execute, getContinueExistingPeriodicTasksAfterShutdownPolicy, getExecuteExistingDelayedTasksAfterShutdownPolicy, getQueue, getRemoveOnCancelPolicy, schedule, schedule, scheduleAtFixedRate, scheduleWithFixedDelay, setContinueExistingPeriodicTasksAfterShutdownPolicy, setExecuteExistingDelayedTasksAfterShutdownPolicy, setRemoveOnCancelPolicy, shutdown, shutdownNow, submit, submit, submit

Methods inherited from class java.util.concurrent.ThreadPoolExecutor

afterExecute, allowCoreThreadTimeOut, allowsCoreThreadTimeOut, awaitTermination, beforeExecute, finalize, getActiveCount, getCompletedTaskCount, getCorePoolSize, getKeepAliveTime, getLargestPoolSize, getMaximumPoolSize, getPoolSize, getRejectedExecutionHandler, getTaskCount, getThreadFactory, isShutdown, isTerminated, isTerminating, prestartAllCoreThreads, prestartCoreThread, purge, remove, setCorePoolSize, setKeepAliveTime, setMaximumPoolSize, setRejectedExecutionHandler, setThreadFactory, terminated

Methods inherited from class java.util.concurrent.AbstractExecutorService

invokeAll, invokeAll, invokeAny, invokeAny

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.concurrent.ExecutorService

awaitTermination, invokeAll, invokeAll, invokeAny, invokeAny, isShutdown, isTerminated

Constructor Detail

RejectableScheduledThreadPoolExecutor

public RejectableScheduledThreadPoolExecutor(int corePoolSize)

RejectableScheduledThreadPoolExecutor

public RejectableScheduledThreadPoolExecutor(int corePoolSize,
                                             ThreadFactory threadFactory)

RejectableScheduledThreadPoolExecutor

public RejectableScheduledThreadPoolExecutor(int corePoolSize,
                                             RejectedExecutionHandler handler)

RejectableScheduledThreadPoolExecutor

public RejectableScheduledThreadPoolExecutor(int corePoolSize,
                                             ThreadFactory threadFactory,
                                             RejectedExecutionHandler handler)

Method Detail

newTaskFor

protected <T> RunnableFuture<T> newTaskFor(Runnable runnable,
                                           T value)

Overrides:

newTaskFor in class AbstractExecutorService

newTaskFor

protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable)

Overrides:

newTaskFor in class AbstractExecutorService

toString

public String toString()

Overrides:

toString in class ThreadPoolExecutor