org.jgroups.blocks.executor

Class ExecutionService.DistributedFuture.Sync<V>

java.lang.Object

java.util.concurrent.locks.AbstractOwnableSynchronizer

java.util.concurrent.locks.AbstractQueuedSynchronizer

org.jgroups.blocks.executor.ExecutionService.DistributedFuture.Sync<V>

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

ExecutionService.DistributedFuture<V>

protected static final class ExecutionService.DistributedFuture.Sync<V>
extends java.util.concurrent.locks.AbstractQueuedSynchronizer

Synchronization control for FutureTask. Note that this must be a non-static inner class in order to invoke the protected done method. For clarity, all inner class support methods are same as outer, prefixed with "inner". Uses AQS sync state to represent run status

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.concurrent.locks.AbstractQueuedSynchronizer

java.util.concurrent.locks.AbstractQueuedSynchronizer.ConditionObject

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.concurrent.Callable<V>	callable The underlying callable
protected static int	CANCELLED State value representing that task was cancelled
protected java.lang.Throwable	exception The exception to throw from get()
protected ExecutionService.DistributedFuture<V>	future The containing future
protected static int	RAN State value representing that task ran
protected V	result The result to return from get()
protected java.lang.Thread	runner The thread running task.
protected static int	RUNNING State value representing that task is running

Constructor Summary

Constructors

Constructor and Description
Sync(ExecutionService.DistributedFuture<V> future, java.util.concurrent.Callable<V> callable)

Method Summary

Modifier and Type	Method and Description
protected int	tryAcquireShared(int ignore) Implements AQS base acquire to succeed if ran or cancelled
protected boolean	tryReleaseShared(int ignore) Implements AQS base release to always signal after setting final done status by nulling runner thread.

Methods inherited from class java.util.concurrent.locks.AbstractQueuedSynchronizer

acquire, acquireInterruptibly, acquireShared, acquireSharedInterruptibly, compareAndSetState, getExclusiveQueuedThreads, getFirstQueuedThread, getQueuedThreads, getQueueLength, getSharedQueuedThreads, getState, getWaitingThreads, getWaitQueueLength, hasContended, hasQueuedPredecessors, hasQueuedThreads, hasWaiters, isHeldExclusively, isQueued, owns, release, releaseShared, setState, toString, tryAcquire, tryAcquireNanos, tryAcquireSharedNanos, tryRelease

Methods inherited from class java.util.concurrent.locks.AbstractOwnableSynchronizer

getExclusiveOwnerThread, setExclusiveOwnerThread

Methods inherited from class java.lang.Object

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

Field Detail

RUNNING

protected static final int RUNNING

State value representing that task is running

See Also:

Constant Field Values

RAN

protected static final int RAN

State value representing that task ran

See Also:

Constant Field Values

CANCELLED

protected static final int CANCELLED

State value representing that task was cancelled

See Also:

Constant Field Values

future

protected final ExecutionService.DistributedFuture<V> future

The containing future

callable

protected final java.util.concurrent.Callable<V> callable

The underlying callable

result

protected V result

The result to return from get()

exception

protected java.lang.Throwable exception

The exception to throw from get()

runner

protected transient volatile java.lang.Thread runner

The thread running task. When nulled after set/cancel, this indicates that the results are accessible. Must be volatile, to ensure visibility upon completion.

Constructor Detail

Sync

public Sync(ExecutionService.DistributedFuture<V> future,
            java.util.concurrent.Callable<V> callable)

Method Detail

tryAcquireShared

protected int tryAcquireShared(int ignore)

Implements AQS base acquire to succeed if ran or cancelled

Overrides:

tryAcquireShared in class java.util.concurrent.locks.AbstractQueuedSynchronizer

tryReleaseShared

protected boolean tryReleaseShared(int ignore)

Implements AQS base release to always signal after setting final done status by nulling runner thread.

Overrides:

tryReleaseShared in class java.util.concurrent.locks.AbstractQueuedSynchronizer