ptolemy.actor.lib
Class OrderedMerge

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.OrderedMerge

All Implemented Interfaces:

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

Direct Known Subclasses:

DDFOrderedMerge

public class OrderedMerge
extends TypedAtomicActor

This actor merges two monotonically nondecreasing streams of tokens into one monotonically nondecreasing stream. On each firing, it reads data from one of the inputs. On the first firing, it simply records that token. On the second firing, it reads data from the other input and outputs the smaller of the recorded token and the one it just read. If they are equal, then it outputs the recorded token. It then records the larger token. On each subsequent firing, it reads a token from the input port that did not provide the recorded token, and produces at the output the smaller of the recorded token and the one just read. Each time it produces an output token, it also produces true on the selectedA output if the output token came from inputA, and false if it came from inputB.

If both input sequences are nondecreasing, then the output sequence will be nondecreasing. Note that if the inputs are not nondecreasing, then the output is rather complex. The key is that in each firing, it produces the smaller of the recorded token and the token it is currently reading.

Since:

Ptolemy II 2.0.1

Version:

$Id: OrderedMerge.java 57040 2010-01-27 20:52:32Z cxh $

Author:

Edward A. Lee

See Also:

Serialized Form

Accepted Rating:

Red (eal)

Proposed Rating:

Red (eal)

Nested Class Summary

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

Entity.ContainedObjectsIterator

Field Summary

private ScalarToken	_lastProduced The last produced token.
private TypedIOPort	_nextPort The port from which to read next.
private static IntToken	_one A final static IntToken with value 1.
private boolean	_readFromA Indicator of whether the _recordedToken was read from A.
private ScalarToken	_recordedToken The recorded token.
private ScalarToken	_tentativeLastProduced The tentative last produced token.
private TypedIOPort	_tentativeNextPort The tentative port from which to read next.
private boolean	_tentativeReadFromA Tentative indicator of having read from A.
private ScalarToken	_tentativeRecordedToken The tentative recorded token.
private static IntToken	_zero A final static IntToken with value 0.
Parameter	eliminateDuplicates If true, eliminate duplicate tokens in the output stream.
TypedIOPort	inputA The first input port, which accepts any scalar token.
Parameter	inputA_tokenConsumptionRate The token consumption rate for inputA.
TypedIOPort	inputB The second input port, which accepts any scalar token with the same type as the first input port.
Parameter	inputB_tokenConsumptionRate The token consumption rate for inputB.
TypedIOPort	output The output port, which has the same type as the input ports.
TypedIOPort	selectedA Output port indicating whether the output token came from inputA.

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

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

Method Summary

protected TypedIOPort	_getNextPort() Return the port that this actor will read from on the next invocation of the fire() method.
java.lang.Object	clone(Workspace workspace) Clone the actor into the specified workspace.
void	fire() Read one token from the port that did not provide the recorded token (or inputA, on the first firing), and output the smaller of the recorded token or the newly read token.
void	initialize() Initialize this actor to indicate that no token is recorded.
boolean	postfire() Commit the recorded token.

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, prefire, preinitialize, pruneDependencies, recordFiring, removeActorFiringListener, removeDependency, removeInitializable, setContainer, stop, stopFire, terminate, wrapup

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, attributeChanged, 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, prefire, stop, stopFire, terminate

Methods inherited from interface ptolemy.actor.Initializable

addInitializable, preinitialize, removeInitializable, wrapup

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

eliminateDuplicates

public Parameter eliminateDuplicates

If true, eliminate duplicate tokens in the output stream. This is a boolean that defaults to false.

inputA

public TypedIOPort inputA

The first input port, which accepts any scalar token.

inputA_tokenConsumptionRate

public Parameter inputA_tokenConsumptionRate

The token consumption rate for inputA.

inputB

public TypedIOPort inputB

The second input port, which accepts any scalar token with the same type as the first input port.

inputB_tokenConsumptionRate

public Parameter inputB_tokenConsumptionRate

The token consumption rate for inputB.

output

public TypedIOPort output

The output port, which has the same type as the input ports.

selectedA

public TypedIOPort selectedA

Output port indicating whether the output token came from inputA.

_lastProduced

private ScalarToken _lastProduced

The last produced token. Used to eliminate duplicates.

_nextPort

private TypedIOPort _nextPort

The port from which to read next.

_one

private static final IntToken _one

A final static IntToken with value 1.

_readFromA

private boolean _readFromA

Indicator of whether the _recordedToken was read from A.

_recordedToken

private ScalarToken _recordedToken

The recorded token.

_tentativeLastProduced

private ScalarToken _tentativeLastProduced

The tentative last produced token. Used to eliminate duplicates.

_tentativeReadFromA

private boolean _tentativeReadFromA

Tentative indicator of having read from A.

_tentativeRecordedToken

private ScalarToken _tentativeRecordedToken

The tentative recorded token.

_tentativeNextPort

private TypedIOPort _tentativeNextPort

The tentative port from which to read next.

_zero

private static final IntToken _zero

A final static IntToken with value 0.

Constructor Detail

OrderedMerge

public OrderedMerge(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

clone

public java.lang.Object clone(Workspace workspace)
                       throws java.lang.CloneNotSupportedException

Clone the actor into the specified workspace. This calls the base class and then sets the type constraints.

Overrides:

clone in class AtomicActor

Parameters:

workspace - The workspace for the new object.

Returns:

A new actor.

Throws:

java.lang.CloneNotSupportedException - If a derived class has an attribute that cannot be cloned.

See Also:

NamedObj.exportMoML(Writer, int, String), NamedObj.setDeferringChangeRequests(boolean)

fire

public void fire()
          throws IllegalActionException

Read one token from the port that did not provide the recorded token (or inputA, on the first firing), and output the smaller of the recorded token or the newly read token. If there is no token on the port to be read, then do nothing and return. If an output token is produced, then also produce true on the selectedA output if the output token came from inputA, and false if it came from inputB.

Specified by:

fire in interface Executable

Overrides:

fire in class AtomicActor

Throws:

IllegalActionException - If there is no director.

initialize

public void initialize()
                throws IllegalActionException

Initialize this actor to indicate that no token is recorded.

Specified by:

initialize in interface Initializable

Overrides:

initialize in class AtomicActor

Throws:

IllegalActionException - If a derived class throws it.

postfire

public boolean postfire()
                 throws IllegalActionException

Commit the recorded token.

Specified by:

postfire in interface Executable

Overrides:

postfire in class AtomicActor

Returns:

True.

Throws:

IllegalActionException - Not thrown in this base class.

_getNextPort

protected TypedIOPort _getNextPort()

Return the port that this actor will read from on the next invocation of the fire() method. This will be null before the first invocation of initialize().

Returns:

The next input port.