Class GRScheduler

  • All Implemented Interfaces:
    java.lang.Cloneable, Changeable, Debuggable, DebugListener, Derivable, ModelErrorHandler, MoMLExportable, Moveable, Nameable

    public class GRScheduler
    extends Scheduler
    A scheduler that implements scheduling of the active parts of a GR scene graph. The scene graph is assumed to be a directed acyclic graph. Scheduling is done by performing a topological sort on all the actors.
    Since:
    Ptolemy II 1.0
    Version:
    $Id$
    Author:
    C. Fong, Steve Neuendorffer
    See Also:
    Scheduler
    Pt.AcceptedRating:
    yellow (vogel)
    Pt.ProposedRating:
    yellow (chf)
    • Constructor Detail

      • GRScheduler

        public GRScheduler()
        Construct a scheduler with no container (director) in the default workspace, the name of the scheduler is "GRScheduler".
      • GRScheduler

        public GRScheduler​(Workspace workspace)
        Construct a scheduler in the given workspace with the name "GRScheduler". If the workspace argument is null, use the default workspace. The scheduler is added to the list of objects in the workspace. Increment the version number of the workspace.
        Parameters:
        workspace - Object for synchronization and version tracking.
      • GRScheduler

        public GRScheduler​(Director container,
                           java.lang.String name)
                    throws IllegalActionException,
                           NameDuplicationException
        Construct a scheduler in the given container with the given name. The container argument must not be null, or a NullPointerException will be thrown. This attribute will use the workspace of the container for synchronization and version counts. If the name argument is null, then the name is set to the empty string. Increment the version of the workspace.
        Parameters:
        container - The container.
        name - The name of this attribute.
        Throws:
        IllegalActionException - If the attribute is not of an acceptable class for the container, or if the name contains a period.
        NameDuplicationException - If the name coincides with an attribute already in the container.
    • Method Detail

      • _getSchedule

        protected Schedule _getSchedule()
        Return the scheduling sequence. An exception will be thrown if the graph is not schedulable. This occurs in the following circumstances:
        • The graph is not a connected graph.
        • The graph is not acyclic
        • Multiple output ports are connected to the same broadcast relation. (equivalent to a non-deterministic merge)
        Overrides:
        _getSchedule in class Scheduler
        Returns:
        A Schedule type of the deeply contained opaque entities in the firing order.
        Throws:
        NotSchedulableException - If the CompositeActor is not schedulable.
        See Also:
        CompositeEntity.deepEntityList()