ptolemy.domains.de.lib
Class SharedQueue

java.lang.Object
  ptolemy.kernel.util.NamedObj
      ptolemy.kernel.InstantiableNamedObj
          ptolemy.kernel.Entity
              ptolemy.kernel.ComponentEntity
                  ptolemy.actor.AtomicActor
                      ptolemy.actor.TypedAtomicActor
                          ptolemy.actor.lib.Transformer
                              ptolemy.domains.de.lib.Queue
                                  ptolemy.domains.de.lib.SharedQueue

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Actor, Executable, FiringsRecordable, Initializable, TypedActor, Changeable, Debuggable, DebugListener, Derivable, Instantiable, ModelErrorHandler, MoMLExportable, Moveable, Nameable

public class SharedQueue
extends Queue

A queue that outputs the next token to an output channel that is ready to receive it. It can have multiple output channels, and the same number of trigger channels. Initially all output channels are assumed to be ready. When a token is available, it is sent to the first channel that is ready, and that channel is marked not ready. When all channels are not ready, the token would be queued. If the number of tokens already in the queue is equal to the queue capacity (0 means infinity), then new tokens are lost.

To make an output channel ready after a token is sent to it, a triggering signal needs to be received in the corresponding channel of the trigger port.

Since:

Ptolemy II 8.0

Version:

$Id: SharedQueue.java 57044 2010-01-27 22:41:05Z cxh $

Author:

Thomas Huining Feng

See Also:

Serialized Form

Accepted Rating:

Red (tfeng)

Proposed Rating:

Red (tfeng)

Nested Class Summary

Nested classes/interfaces inherited from class ptolemy.kernel.Entity

Entity.ContainedObjectsIterator

Field Summary

private boolean[]

_outputReady

Fields inherited from class ptolemy.domains.de.lib.Queue

_queue, _removeTokens, _token, capacity, persistentTrigger, size, trigger

Fields inherited from class ptolemy.actor.lib.Transformer

input, output

Fields inherited from class ptolemy.actor.AtomicActor

_actorFiringListeners, _initializables, _notifyingActorFiring, _stopRequested

Fields inherited from class ptolemy.kernel.util.NamedObj

_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKS

Fields inherited from interface ptolemy.actor.Executable

COMPLETED, NOT_READY, STOP_ITERATING

Constructor Summary

SharedQueue(CompositeEntity container, java.lang.String name)
Construct an actor with the given container and name.

Method Summary

void	fire() If there is an input at the input port, consume it.
boolean	prefire() Return true if either there is input at the input port, or there are triggering signals at the trigger port.
void	preinitialize() Make all output channels ready.
void	wrapup() Clear the buffer.

Methods inherited from class ptolemy.domains.de.lib.Queue

attributeChanged, clone, initialize, postfire

Methods inherited from class ptolemy.actor.TypedAtomicActor

_addPort, _fireAt, _fireAt, attributeTypeChanged, clone, newPort, typeConstraintList, typeConstraints

Methods inherited from class ptolemy.actor.AtomicActor

_actorFiring, _actorFiring, addActorFiringListener, addInitializable, connectionsChanged, createReceivers, declareDelayDependency, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, isFireFunctional, isStrict, iterate, newReceiver, outputPortList, pruneDependencies, recordFiring, removeActorFiringListener, removeDependency, removeInitializable, setContainer, stop, stopFire, terminate

Methods inherited from class ptolemy.kernel.ComponentEntity

_adjustDeferrals, _checkContainer, _getContainedObject, _propagateExistence, getContainer, instantiate, isAtomic, isOpaque, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, propagateExistence, setName

Methods inherited from class ptolemy.kernel.Entity

_description, _exportMoMLContents, _removePort, _validateSettables, connectedPortList, connectedPorts, containedObjectsIterator, getAttribute, getPort, getPorts, linkedRelationList, linkedRelations, portList, removeAllPorts, setClassDefinition, uniqueName

Methods inherited from class ptolemy.kernel.InstantiableNamedObj

_setParent, exportMoML, getChildren, getElementName, getParent, getPrototypeList, isClassDefinition, isWithinClassDefinition

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _debug, _debug, _debug, _debug, _debug, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _propagateValue, _recordDecoratedAttributes, _removeAttribute, _splitName, _stripNumericSuffix, addChangeListener, addDebugListener, attributeList, attributeList, deepContains, depthInHierarchy, description, description, event, executeChangeRequests, exportMoML, exportMoML, exportMoML, exportMoML, exportMoMLPlain, getAttribute, getAttributes, getChangeListeners, getClassName, getDecoratorAttribute, getDecoratorAttributes, getDerivedLevel, getDerivedList, getDisplayName, getFullName, getModelErrorHandler, getName, getName, getSource, handleModelError, isDeferringChangeRequests, isOverridden, isPersistent, lazyContainedObjectsIterator, message, propagateValue, propagateValues, removeChangeListener, removeDebugListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, validateSettables, workspace

Methods inherited from class java.lang.Object

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

Methods inherited from interface ptolemy.actor.Actor

createReceivers, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, newReceiver, outputPortList

Methods inherited from interface ptolemy.actor.Executable

isFireFunctional, isStrict, iterate, stop, stopFire, terminate

Methods inherited from interface ptolemy.actor.Initializable

addInitializable, removeInitializable

Methods inherited from interface ptolemy.kernel.util.Nameable

description, getContainer, getDisplayName, getFullName, getName, getName, setName

Methods inherited from interface ptolemy.kernel.util.Derivable

getDerivedLevel, getDerivedList, propagateValue

Field Detail

_outputReady

private boolean[] _outputReady

Constructor Detail

SharedQueue

public SharedQueue(CompositeEntity container,
                   java.lang.String name)
            throws NameDuplicationException,
                   IllegalActionException

Construct an actor with the given container and name.

Parameters:

container - The container.

name - The name of this actor.

Throws:

IllegalActionException - If the actor cannot be contained by the proposed container.

NameDuplicationException - If the container already has an actor with this name.

Method Detail

fire

public void fire()
          throws IllegalActionException

If there is an input at the input port, consume it. If there are tokens in the queue and there are ready output channels, the tokens are sent to those output channels. If triggers are available at the trigger port, consume them and make the corresponding output channels ready. Also send tokens to those channels if there are tokens available.

Specified by:

fire in interface Executable

Overrides:

fire in class Queue

Throws:

IllegalActionException - If getting tokens from input and trigger ports or sending token to output throws it.

prefire

public boolean prefire()
                throws IllegalActionException

Return true if either there is input at the input port, or there are triggering signals at the trigger port. Return false otherwise.

Specified by:

prefire in interface Executable

Overrides:

prefire in class Queue

Returns:

True if this actor is ready to fire.

Throws:

IllegalActionException - If the ports cannot be tested for availability of tokens.

preinitialize

public void preinitialize()
                   throws IllegalActionException

Make all output channels ready.

Specified by:

preinitialize in interface Initializable

Overrides:

preinitialize in class Queue

Throws:

IllegalActionException - If thrown by the superclass.

wrapup

public void wrapup()
            throws IllegalActionException

Clear the buffer.

Specified by:

wrapup in interface Initializable

Overrides:

wrapup in class Queue

Throws:

IllegalActionException - If thrown by the superclass.