ptolemy.actor

Interface ActorExecutionAspect

All Superinterfaces:

Decorator, Nameable

public interface ActorExecutionAspect
extends Decorator

An interface for objects that can intervene in the execution of actors. A director that executes actors decorated by a resource scheduler has to consult the resource scheduler before firing the actor. If the resource scheduler returns that there are not enough resources available to fire the actor, the firing must be postponed.

For example, a resource scheduler could represent a CPU and actors scheduled on a CPU have execution times. The resource scheduler takes care of scheduling the actors according to a given scheduling strategy and keeping track of the remaining execution times.

Since:

Ptolemy II 10.0

Author:

Patricia Derler, Edward A. Lee

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Red (cxh)

Method Summary

Modifier and Type	Method and Description
void	addExecutingListener(ExecutionAspectListener listener) Add schedule listener.
double	getExecutionTime(NamedObj actor) Get the execution time of an actor.
void	initializeDecoratedActors() Iterate through all entities deeply contained by the container, record for each that it is not executing.
boolean	isWaitingForResource(Actor actor) Return whether an actor is currently waiting for a resource.
boolean	lastScheduledActorFinished() Check whether last actor that was scheduled on this resource scheduler finished execution.
void	notifyExecutionListeners(NamedObj entity, java.lang.Double time, ExecutionAspectListener.ExecutionEventType eventType) Notify execution listeners about rescheduling events.
void	removeExecutionListener(ExecutionAspectListener listener) Remove schedule listener.
Time	schedule(NamedObj actor, Time environmentTime, Time deadline, Time executionTime) Schedule the actor.
Time	schedule(Time environmentTime) Perform rescheduling actions when no new actor requests to be scheduled.

Methods inherited from interface ptolemy.kernel.util.Decorator

createDecoratorAttributes, decoratedObjects, isGlobalDecorator

Methods inherited from interface ptolemy.kernel.util.Nameable

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

Method Detail

addExecutingListener

void addExecutingListener(ExecutionAspectListener listener)
                   throws IllegalActionException

Add schedule listener. If necessary, initialize list of actors scheduled by this resource scheduler.

Parameters:

listener - The listener to be added.

Throws:

IllegalActionException - If an error occurs in the initialization of actors scheduled by this resource scheduler.

initializeDecoratedActors

void initializeDecoratedActors()
                        throws IllegalActionException

Iterate through all entities deeply contained by the container, record for each that it is not executing.

Throws:

IllegalActionException - If the decorator parameters cannot be read.

getExecutionTime

double getExecutionTime(NamedObj actor)
                 throws IllegalActionException

Get the execution time of an actor. If the actor does not have an attribute specifying the execution time, return the minimum execution time.

Parameters:

actor - The named object.

Returns:

The execution time.

Throws:

IllegalActionException - Thrown in attribute or token cannot be read.

isWaitingForResource

boolean isWaitingForResource(Actor actor)

Return whether an actor is currently waiting for a resource.

Parameters:

actor - The actor that might be waiting for a resource.

Returns:

True if the actor is waiting for a resource.

lastScheduledActorFinished

boolean lastScheduledActorFinished()

Check whether last actor that was scheduled on this resource scheduler finished execution.

Returns:

True if last actor that requested to be scheduled finished.

notifyExecutionListeners

void notifyExecutionListeners(NamedObj entity,
                              java.lang.Double time,
                              ExecutionAspectListener.ExecutionEventType eventType)

Notify execution listeners about rescheduling events.

Parameters:

entity - Entity that is being scheduled.

time - Time when entity is being scheduled.

eventType - Type of event.

schedule

Time schedule(Time environmentTime)
       throws IllegalActionException

Perform rescheduling actions when no new actor requests to be scheduled.

Parameters:

environmentTime - The outside time.

Returns:

Relative time when this Scheduler has to be executed again to perform rescheduling actions.

Throws:

IllegalActionException - Thrown in subclasses.

schedule

Time schedule(NamedObj actor,
              Time environmentTime,
              Time deadline,
              Time executionTime)
       throws IllegalActionException

Schedule the actor. In this base class, do nothing. Derived classes should schedule the actor.

Parameters:

actor - The actor to be scheduled.

environmentTime - The current platform time.

deadline - The deadline timestamp of the event to be scheduled. This can be the same as the environmentTime.

executionTime - The execution time of the actor.

Returns:

Relative time when this Scheduler has to be executed again to perform rescheduling actions. In this base class, null is returned.

Throws:

IllegalActionException - Thrown if actor parameters such as execution time or priority cannot be read.

removeExecutionListener

void removeExecutionListener(ExecutionAspectListener listener)

Remove schedule listener.

Parameters:

listener - The listener to be removed.