ptolemy.actor

Class FiringEvent

java.lang.Object

ptolemy.actor.FiringEvent

All Implemented Interfaces:

DebugEvent

public class FiringEvent
extends java.lang.Object
implements DebugEvent

An event that is published by directors whenever an actor is activated. An activation occurs whenever an actor is prefired, fired, or postfired. The appropriate event should be published just before or after the associated method of the executable interface is called. The iterate event is published by those directors which vectorize firings of a particular actor. This event may be published instead of many individual prefire, fire and postfire events. As an example of how to implement a director that publishes these events, see the SDF Director. One way in which these events are used is to trace the firings of different actors. A user interface can also implement a breakpoint mechanism by pausing execution of the executing thread in response to one of these events.

Note that since most directors work with a constant set of actors, and fire them repeatedly, it may improve efficiency dramatically to use a flyweight design pattern with firing events. This can result in greatly reducing the load on the garbage collector.

Since:

Ptolemy II 1.0

Author:

Steve Neuendorffer

See Also:

DebugListener

Pt.AcceptedRating:

Yellow (neuendor)

Pt.ProposedRating:

Green (neuendor)

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FiringEvent.FiringEventType A type of firing event that can be published.

Field Summary

Fields

Modifier and Type	Field and Description
static FiringEvent.FiringEventType	AFTER_FIRE This type of event is published after a fire method is called.
static FiringEvent.FiringEventType	AFTER_ITERATE This type of event is published after an iterate method is called.
static FiringEvent.FiringEventType	AFTER_POSTFIRE This type of event is published after a postfire method is called.
static FiringEvent.FiringEventType	AFTER_PREFIRE This type of event is published after a prefire method is called.
static FiringEvent.FiringEventType	AFTER_RW_FIRE The type of event published as part of the Kepler sql actor.
static FiringEvent.FiringEventType	BEFORE_FIRE This type of event is published before a fire method is called.
static FiringEvent.FiringEventType	BEFORE_ITERATE This type of event is published before an iterate method is called.
static FiringEvent.FiringEventType	BEFORE_POSTFIRE This type of event is published before a postfire method is called.
static FiringEvent.FiringEventType	BEFORE_PREFIRE This type of event is published before a prefire method is called.
static FiringEvent.FiringEventType	BEFORE_RW_FIRE The type of event published as part of the Kepler sql actor.

Constructor Summary

Constructors

Constructor and Description
FiringEvent(Director source, Actor actor, FiringEvent.FiringEventType type) Create a new firing event with the given source, actor, and type.
FiringEvent(Director source, Actor actor, FiringEvent.FiringEventType type, int multiplicity) Create a new firing event with the given source, actor, type, and multiplicity.

Method Summary

Modifier and Type	Method and Description
Actor	getActor() Return the actor that is being activated.
Director	getDirector() Return the director that activated the actor.
NamedObj	getSource() Return the source of the event.
FiringEvent.FiringEventType	getType() Return the type of activation that this event represents.
java.lang.String	toString() Return a string representation of this event.

Methods inherited from class java.lang.Object

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

Field Detail

AFTER_PREFIRE

public static final FiringEvent.FiringEventType AFTER_PREFIRE

This type of event is published after a prefire method is called.

AFTER_FIRE

public static final FiringEvent.FiringEventType AFTER_FIRE

This type of event is published after a fire method is called.

AFTER_POSTFIRE

public static final FiringEvent.FiringEventType AFTER_POSTFIRE

This type of event is published after a postfire method is called.

AFTER_ITERATE

public static final FiringEvent.FiringEventType AFTER_ITERATE

This type of event is published after an iterate method is called.

BEFORE_PREFIRE

public static final FiringEvent.FiringEventType BEFORE_PREFIRE

This type of event is published before a prefire method is called.

BEFORE_FIRE

public static final FiringEvent.FiringEventType BEFORE_FIRE

This type of event is published before a fire method is called.

BEFORE_POSTFIRE

public static final FiringEvent.FiringEventType BEFORE_POSTFIRE

This type of event is published before a postfire method is called.

BEFORE_ITERATE

public static final FiringEvent.FiringEventType BEFORE_ITERATE

This type of event is published before an iterate method is called.

BEFORE_RW_FIRE

public static final FiringEvent.FiringEventType BEFORE_RW_FIRE

The type of event published as part of the Kepler sql actor.

AFTER_RW_FIRE

public static final FiringEvent.FiringEventType AFTER_RW_FIRE

The type of event published as part of the Kepler sql actor.

Constructor Detail

FiringEvent

public FiringEvent(Director source,
                   Actor actor,
                   FiringEvent.FiringEventType type)

Create a new firing event with the given source, actor, and type.

Parameters:

source - The director invoking the firing.

actor - The actor being fired.

type - An identifier for the method being invoked, which is one of AFTER_PREFIRE, AFTER_FIRE, AFTER_POSTFIRE, AFTER_ITERATE, BEFORE_PREFIRE, BEFORE_FIRE, BEFORE_POSTFIRE, or BEFORE_ITERATE.

FiringEvent

public FiringEvent(Director source,
                   Actor actor,
                   FiringEvent.FiringEventType type,
                   int multiplicity)

Create a new firing event with the given source, actor, type, and multiplicity.

Parameters:

source - The director invoking the firing.

actor - The actor being fired.

type - An identifier for the method being invoked, which is one of AFTER_PREFIRE, AFTER_FIRE, AFTER_POSTFIRE, AFTER_ITERATE, BEFORE_PREFIRE, BEFORE_FIRE, BEFORE_POSTFIRE, or BEFORE_ITERATE.

multiplicity - The multiplicity of the firing.

Method Detail

getActor

public Actor getActor()

Return the actor that is being activated.

Returns:

The actor that is being activated.

getDirector

public Director getDirector()

Return the director that activated the actor.

Returns:

The director that activated the actor.

getSource

public NamedObj getSource()

Return the source of the event. This class returns the director that activated the actor.

Specified by:

getSource in interface DebugEvent

Returns:

An instance of Director.

getType

public FiringEvent.FiringEventType getType()

Return the type of activation that this event represents.

Returns:

the type of activation that this event represents.

toString

public java.lang.String toString()

Return a string representation of this event.

Specified by:

toString in interface DebugEvent

Overrides:

toString in class java.lang.Object

Returns:

A user-readable string describing the event.