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## org.jgroups.blocks.executor
Class ExecutionService

    java.lang.Object
      java.util.concurrent.AbstractExecutorService
          org.jgroups.blocks.executor.ExecutionService

All Implemented Interfaces:
  java.util.concurrent.Executor, java.util.concurrent.ExecutorService

    public class ExecutionService

extends java.util.concurrent.AbstractExecutorService

This is a jgroups implementation of an ExecutorService, where the consumers are running on any number of nodes. The nodes should run `ExecutionRunner` to start picking up requests.

Every future object returned will be a `NotifyingFuture` which allows for not having to query the future and have a callback instead. This can then be used as a workflow to submit other tasks sequentially or also to query the future for the value at that time.

Every callable or runnable submitted must be either `Serializable`, `Externalizable`, or `Streamable`. Also the value returned from a callable must `Serializable`, `Externalizable`, or `Streamable`. Unfortunately if the value returned is not serializable then a `NotSerializableException` will be thrown as the cause.

Since:
  2.12.0
Author:
  wburns

Nested Class Summary
`static class` | `ExecutionService.DistributedFuture<V>` This is basically a copy of the FutureTask in java.util.concurrent but added serializable to it.
`protected static class` | `ExecutionService.RunnableAdapter<T>` This is copied from `Executors` class which contains RunnableAdapter.

Field Summary
`protected Executing` | `_execProt`
`protected java.util.concurrent.atomic.AtomicBoolean` | `_shutdown`
`protected java.util.concurrent.locks.Condition` | `_unfinishedCondition`
`protected java.util.Set<java.util.concurrent.Future<?>>` | `_unfinishedFutures`
`protected java.util.concurrent.locks.Lock` | `_unfinishedLock`
`protected JChannel` | `ch`

Constructor Summary
`ExecutionService()`
`ExecutionService(JChannel ch)`

Method Summary
`boolean` | `awaitTermination(long timeout, java.util.concurrent.TimeUnit unit)`
`void` | `execute(java.lang.Runnable command)`
`boolean` | `isShutdown()`
`boolean` | `isTerminated()`
`protected
`<T> java.util.concurrent.RunnableFuture<T>`
` | `newTaskFor(java.util.concurrent.Callable<T> callable)`
`protected
`<T> java.util.concurrent.RunnableFuture<T>`
` | `newTaskFor(java.lang.Runnable runnable, T value)`
`void` | `setChannel(JChannel ch)`
`void` | `shutdown()`
`java.util.List<java.lang.Runnable>` | `shutdownNow()`
`
`<T> NotifyingFuture<T>`
` | `submit(java.util.concurrent.Callable<T> task)`
`
`<T> NotifyingFuture<T>`
` | `submit(java.lang.Runnable task, T result)`

Methods inherited from class java.util.concurrent.AbstractExecutorService
`invokeAll, invokeAll, invokeAny, invokeAny, submit`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### ch

    protected JChannel ch

### _execProt

    protected Executing _execProt

### _unfinishedLock

    protected java.util.concurrent.locks.Lock _unfinishedLock

### _unfinishedCondition

    protected java.util.concurrent.locks.Condition _unfinishedCondition

### _unfinishedFutures

    protected java.util.Set<java.util.concurrent.Future<?>> _unfinishedFutures

### _shutdown

    protected java.util.concurrent.atomic.AtomicBoolean _shutdown

Constructor Detail

### ExecutionService

    public ExecutionService()

### ExecutionService

    public ExecutionService(JChannel ch)

Method Detail

### setChannel

    public void setChannel(JChannel ch)

### submit

    public <T> NotifyingFuture<T> submit(java.lang.Runnable task,
                                         T result)

  Specified by:
    `submit` in interface `java.util.concurrent.ExecutorService`
  Overrides:
    `submit` in class `java.util.concurrent.AbstractExecutorService`

### submit

    public <T> NotifyingFuture<T> submit(java.util.concurrent.Callable<T> task)

  Specified by:
    `submit` in interface `java.util.concurrent.ExecutorService`
  Overrides:
    `submit` in class `java.util.concurrent.AbstractExecutorService`

### shutdown

    public void shutdown()

### shutdownNow

    public java.util.List<java.lang.Runnable> shutdownNow()

### isShutdown

    public boolean isShutdown()

### isTerminated

    public boolean isTerminated()

### awaitTermination

    public boolean awaitTermination(long timeout,
                                    java.util.concurrent.TimeUnit unit)
                             throws java.lang.InterruptedException

  Throws:
    `java.lang.InterruptedException`

### execute

    public void execute(java.lang.Runnable command)

### newTaskFor

    protected <T> java.util.concurrent.RunnableFuture<T> newTaskFor(java.lang.Runnable runnable,
                                                                    T value)

  Overrides:
    `newTaskFor` in class `java.util.concurrent.AbstractExecutorService`

### newTaskFor

    protected <T> java.util.concurrent.RunnableFuture<T> newTaskFor(java.util.concurrent.Callable<T> callable)

  Overrides:
    `newTaskFor` in class `java.util.concurrent.AbstractExecutorService`

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Copyright © 1998-2009 Bela Ban / Red Hat. All Rights Reserved.