groovyx.gpars.actor

Class AbstractLoopingActor

java.lang.Object

groovyx.gpars.serial.WithSerialId

groovyx.gpars.actor.impl.MessageStream

groovyx.gpars.actor.Actor

groovyx.gpars.actor.AbstractLoopingActor

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

DefaultActor, DynamicDispatchActor, InternalActor, ReactiveActor, StaticDispatchActor

public abstract class AbstractLoopingActor
extends Actor

Wraps all actors that repeatedly loop through incoming messages and hold no implicit state between subsequent messages.

Author:

Vaclav Pech Date: Aug 23, 2010

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class groovyx.gpars.actor.impl.MessageStream

MessageStream.RemoteMessageStream, MessageStream.SendTo

Field Summary

Fields

Modifier and Type	Field and Description
private AsyncMessagingCore	core Holds the particular instance of async messaging core to use
private MessageStream	currentSender
private ActorTimerTask	currentTimerTask
private static long	serialVersionUID
private boolean	stoppedFlag
private boolean	terminatedFlag
(package private) boolean	terminatingFlag
private int	timeoutCounter

Fields inherited from class groovyx.gpars.actor.Actor

ACTOR_HAS_ALREADY_BEEN_STARTED, CANNOT_SEND_REPLIES_NO_SENDER_HAS_BEEN_REGISTERED, currentThread, parallelGroup, START_MESSAGE, STOP_MESSAGE, TERMINATE_MESSAGE, TIMEOUT, TIMEOUT_MESSAGE, timer

Fields inherited from class groovyx.gpars.serial.WithSerialId

serialHandle

Constructor Summary

Constructors

Constructor and Description
AbstractLoopingActor()

Method Summary

Modifier and Type	Method and Description
private void	cancelCurrentTimeoutTask()
private Actor	doStart()
(package private) AsyncMessagingCore	getCore()
MessageStream	getSender() Retrieves the sender actor of the currently processed message.
protected boolean	hasBeenStopped()
protected void	initialize(groovy.lang.Closure code) Builds the async messaging core using the supplied code handler
boolean	isActive() Checks the current status of the Actor.
boolean	isFair() Retrieves the actor's fairness flag Fair actors give up the thread after processing each message, non-fair actors keep a thread until their message queue is empty.
void	makeFair() Makes the actor fair.
void	reply(java.lang.Object message) Sends a reply to all currently processed messages.
void	replyIfExists(java.lang.Object message) Sends a reply to all currently processed messages, which have been sent by an actor.
private void	runEnhancedWithoutRepliesOnMessages(ActorMessage message, groovy.lang.Closure code, java.lang.Object arguments)
MessageStream	send(java.lang.Object message) Send message to stream and return immediately
void	setParallelGroup(PGroup group) Sets the parallel group.
protected void	setTimeout(long timeout)
Actor	silentStart() Starts the Actor without sending the START_MESSAGE message to speed the start-up.
Actor	start() Starts the Actor and sends it the START_MESSAGE to run any afterStart handlers.
Actor	stop() Send message to stop to the Actor.
protected ActorMessage	sweepNextMessage() Removes the head of the message queue
Actor	terminate() Terminates the Actor.

Methods inherited from class groovyx.gpars.actor.Actor

createActorMessage, createRemoteHandle, deregisterCurrentActorWithThread, getJoinLatch, getParallelGroup, handleException, handleInterrupt, handleStart, handleTermination, handleTimeout, isActorThread, join, join, join, join, onStop, registerCurrentActorWithThread, sendAndContinue, sendAndPromise, sweepQueue, threadBoundActor

Methods inherited from class groovyx.gpars.actor.impl.MessageStream

call, getRemoteClass, leftShift, send, send, sendAndWait, sendAndWait, sendAndWait

Methods inherited from class groovyx.gpars.serial.WithSerialId

getOrCreateSerialHandle, writeReplace

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

stoppedFlag

private volatile boolean stoppedFlag

terminatedFlag

private volatile boolean terminatedFlag

terminatingFlag

volatile boolean terminatingFlag

currentTimerTask

private ActorTimerTask currentTimerTask

timeoutCounter

private int timeoutCounter

currentSender

private MessageStream currentSender

core

private AsyncMessagingCore core

Holds the particular instance of async messaging core to use

Constructor Detail

AbstractLoopingActor

public AbstractLoopingActor()

Method Detail

getCore

final AsyncMessagingCore getCore()

initialize

protected final void initialize(groovy.lang.Closure code)

Builds the async messaging core using the supplied code handler

Parameters:

code - Code to run on each message

isFair

public final boolean isFair()

Retrieves the actor's fairness flag Fair actors give up the thread after processing each message, non-fair actors keep a thread until their message queue is empty. Non-fair actors tend to perform better than fair ones.

Returns:

True for fair actors, false for non-fair ones. actors are non-fair by default.

makeFair

public final void makeFair()

Makes the actor fair. Actors are non-fair by default. Fair actors give up the thread after processing each message, non-fair actors keep a thread until their message queue is empty. Non-fair actors tend to perform better than fair ones.

setTimeout

protected final void setTimeout(long timeout)

cancelCurrentTimeoutTask

private void cancelCurrentTimeoutTask()

silentStart

public Actor silentStart()

Starts the Actor without sending the START_MESSAGE message to speed the start-up. The potential custom afterStart handlers won't be run. No messages can be sent or received before an Actor is started.

Specified by:

silentStart in class Actor

Returns:

same actor

start

public Actor start()

Starts the Actor and sends it the START_MESSAGE to run any afterStart handlers. No messages can be sent or received before an Actor is started.

Specified by:

start in class Actor

Returns:

same actor

doStart

private Actor doStart()

stop

public final Actor stop()

Description copied from class: Actor

Send message to stop to the Actor. The actor will finish processing the current message and all unprocessed messages will be passed to the afterStop method, if such exists. No new messages will be accepted since that point. Has no effect if the Actor is not started.

Specified by:

stop in class Actor

Returns:

same actor

terminate

public final Actor terminate()

Description copied from class: Actor

Terminates the Actor. Unprocessed messages will be passed to the afterStop method, if exists. No new messages will be accepted since that point. Has no effect if the Actor is not started.

Specified by:

terminate in class Actor

Returns:

same actor

isActive

public final boolean isActive()

Description copied from class: Actor

Checks the current status of the Actor.

Specified by:

isActive in class Actor

Returns:

current status of the Actor.

hasBeenStopped

protected final boolean hasBeenStopped()

Specified by:

hasBeenStopped in class Actor

sweepNextMessage

protected ActorMessage sweepNextMessage()

Removes the head of the message queue

Specified by:

sweepNextMessage in class Actor

Returns:

The head message, or null, if the message queue is empty

send

public MessageStream send(java.lang.Object message)

Description copied from class: MessageStream

Send message to stream and return immediately

Specified by:

send in class MessageStream

Parameters:

message - message to send

Returns:

always return message stream itself

setParallelGroup

public void setParallelGroup(PGroup group)

Description copied from class: Actor

Sets the parallel group. It can only be invoked before the actor is started.

Overrides:

setParallelGroup in class Actor

Parameters:

group - new group

getSender

public final MessageStream getSender()

Retrieves the sender actor of the currently processed message.

Returns:

The sender of the currently processed message or null, if the message was not sent by an actor

Throws:

ActorReplyException - If some of the replies failed to be sent.

reply

public final void reply(java.lang.Object message)

Sends a reply to all currently processed messages. Throws ActorReplyException if some messages have not been sent by an actor. For such cases use replyIfExists().

Parameters:

message - reply message

Throws:

ActorReplyException - If some of the replies failed to be sent.

replyIfExists

public final void replyIfExists(java.lang.Object message)

Sends a reply to all currently processed messages, which have been sent by an actor. Ignores potential errors when sending the replies, like no sender or sender already stopped.

Parameters:

message - reply message

runEnhancedWithoutRepliesOnMessages

private void runEnhancedWithoutRepliesOnMessages(ActorMessage message,
                                                 groovy.lang.Closure code,
                                                 java.lang.Object arguments)