akka.dispatch

Class BalancingDispatcher

java.lang.Object

akka.dispatch.MessageDispatcher

akka.dispatch.Dispatcher

akka.dispatch.BalancingDispatcher

All Implemented Interfaces:

java.util.concurrent.Executor, scala.concurrent.ExecutionContext, scala.concurrent.ExecutionContextExecutor

public class BalancingDispatcher
extends Dispatcher

An executor based event driven dispatcher which will try to redistribute work from busy actors to idle actors. It is assumed that all actors using the same instance of this dispatcher can process all messages that have been sent to one of the actors. I.e. the actors belong to a pool of actors, and to the client there is no guarantee about which actor instance actually processes a given message.

Although the technique used in this implementation is commonly known as "work stealing", the actual implementation is probably best described as "work donating" because the actor of which work is being stolen takes the initiative.

The preferred way of creating dispatchers is to define configuration of it and use the the lookup method in Dispatchers.

See Also:

BalancingDispatcher, Dispatchers

Nested Class Summary

Nested classes/interfaces inherited from interface scala.concurrent.ExecutionContext

scala.concurrent.ExecutionContext.Implicits$

Constructor Summary

Constructors

Constructor and Description
BalancingDispatcher(MessageDispatcherConfigurator _configurator, java.lang.String _id, int throughput, scala.concurrent.duration.Duration throughputDeadlineTime, MailboxType _mailboxType, ExecutorServiceFactoryProvider _executorServiceFactoryProvider, scala.concurrent.duration.FiniteDuration _shutdownTimeout, boolean attemptTeamWork)

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.ThreadLocal<scala.collection.immutable.List<java.lang.Runnable>>	_tasksLocal()
boolean	batchable(java.lang.Runnable runnable) Override this to define which runnables will be batched.
protected akka.dispatch.Mailbox	createMailbox(akka.actor.Cell actor, MailboxType mailboxType) INTERNAL API
protected void	dispatch(akka.actor.ActorCell receiver, Envelope invocation) INTERNAL API
void	execute(java.lang.Runnable runnable)
MessageQueue	messageQueue() INTERNAL API
protected void	register(akka.actor.ActorCell actor) If you override it, you must call it.
java.util.concurrent.ConcurrentSkipListSet<akka.actor.ActorCell>	team() INTERNAL API
protected void	teamWork()
protected void	unregister(akka.actor.ActorCell actor) If you override it, you must call it.

Methods inherited from class akka.dispatch.Dispatcher

executeTask, executorService, id, registerForExecution, shutdown, shutdownTimeout, systemDispatch, throughput, throughputDeadlineTime, toString

Methods inherited from class akka.dispatch.MessageDispatcher

actors, attach, configurator, debug, detach, eventStream, inhabitants, isThroughputDeadlineTimeDefined, mailboxes, printActors, reportFailure, RESCHEDULED, resume, SCHEDULED, suspend, unbatchedExecute, UNSCHEDULED

Methods inherited from class java.lang.Object

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

Methods inherited from interface scala.concurrent.ExecutionContext

execute, prepare

Constructor Detail

BalancingDispatcher

public BalancingDispatcher(MessageDispatcherConfigurator _configurator,
                   java.lang.String _id,
                   int throughput,
                   scala.concurrent.duration.Duration throughputDeadlineTime,
                   MailboxType _mailboxType,
                   ExecutorServiceFactoryProvider _executorServiceFactoryProvider,
                   scala.concurrent.duration.FiniteDuration _shutdownTimeout,
                   boolean attemptTeamWork)

Method Detail

team

public java.util.concurrent.ConcurrentSkipListSet<akka.actor.ActorCell> team()

INTERNAL API

messageQueue

public MessageQueue messageQueue()

INTERNAL API

createMailbox

protected akka.dispatch.Mailbox createMailbox(akka.actor.Cell actor,
                                  MailboxType mailboxType)

Description copied from class: Dispatcher

INTERNAL API

Overrides:

createMailbox in class Dispatcher

register

protected void register(akka.actor.ActorCell actor)

Description copied from class: MessageDispatcher

If you override it, you must call it. But only ever once. See "attach" for only invocation.

INTERNAL API

Overrides:

register in class MessageDispatcher

unregister

protected void unregister(akka.actor.ActorCell actor)

Description copied from class: MessageDispatcher

If you override it, you must call it. But only ever once. See "detach" for the only invocation

INTERNAL API

Overrides:

unregister in class MessageDispatcher

dispatch

protected void dispatch(akka.actor.ActorCell receiver,
            Envelope invocation)

Description copied from class: Dispatcher

INTERNAL API

Overrides:

dispatch in class Dispatcher

teamWork

protected void teamWork()

_tasksLocal

public java.lang.ThreadLocal<scala.collection.immutable.List<java.lang.Runnable>> _tasksLocal()

execute

public void execute(java.lang.Runnable runnable)

Specified by:

execute in interface java.util.concurrent.Executor

batchable

public boolean batchable(java.lang.Runnable runnable)

Override this to define which runnables will be batched.