org.apache.camel.util.concurrent

Class RejectableThreadPoolExecutor

java.lang.Object

java.util.concurrent.AbstractExecutorService

java.util.concurrent.ThreadPoolExecutor

org.apache.camel.util.concurrent.RejectableThreadPoolExecutor

All Implemented Interfaces:

Executor, ExecutorService

public class RejectableThreadPoolExecutor
extends ThreadPoolExecutor

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 ThreadPoolExecutor.

See Also:

RejectableFutureTask, Rejectable, RejectableScheduledThreadPoolExecutor

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 and Description
RejectableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue)
RejectableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, RejectedExecutionHandler handler)
RejectableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory)
RejectableThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler)

Method Summary

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

Methods inherited from class java.util.concurrent.ThreadPoolExecutor

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

Methods inherited from class java.util.concurrent.AbstractExecutorService

invokeAll, invokeAll, invokeAny, invokeAny, submit, submit, submit

Methods inherited from class java.lang.Object

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

Constructor Detail

RejectableThreadPoolExecutor

public RejectableThreadPoolExecutor(int corePoolSize,
                                    int maximumPoolSize,
                                    long keepAliveTime,
                                    TimeUnit unit,
                                    BlockingQueue<Runnable> workQueue)

RejectableThreadPoolExecutor

public RejectableThreadPoolExecutor(int corePoolSize,
                                    int maximumPoolSize,
                                    long keepAliveTime,
                                    TimeUnit unit,
                                    BlockingQueue<Runnable> workQueue,
                                    ThreadFactory threadFactory)

RejectableThreadPoolExecutor

public RejectableThreadPoolExecutor(int corePoolSize,
                                    int maximumPoolSize,
                                    long keepAliveTime,
                                    TimeUnit unit,
                                    BlockingQueue<Runnable> workQueue,
                                    RejectedExecutionHandler handler)

RejectableThreadPoolExecutor

public RejectableThreadPoolExecutor(int corePoolSize,
                                    int maximumPoolSize,
                                    long keepAliveTime,
                                    TimeUnit unit,
                                    BlockingQueue<Runnable> workQueue,
                                    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