Examples of ptolemy.actor.util.FunctionDependencyOfCompositeActor

ptolemy.actor.util.FunctionDependencyOfCompositeActor
An instance of this class describes the dependency that data at an output port has on data at an input port in a firing of the container (an opaque composite actor). In particular, an output port does not depend on an input port if the fire() method of the container produces outputs on the output port or asserts that no outputs will be produced on the output port in this iteration without knowing anything about the input port (what data are there, or even whether there are data). An actor that has one or more output ports that does not depend on one or more input ports is said to be non-strict.
This class provides both an abstracted view, which gives the function dependency the output ports of a composite actor have on input ports, and a detailed view from which the abstract view is constructed. The detailed view is a graph where the nodes correspond to the ports of a composite actor and to the ports of all deeply contained opaque actors, and the edges represent either the communication dependencies implied by the connections within this composite actor or the function dependencies of the contained opaque actors. The detailed view is typically used by a director to construct a schedule while the abstracted view is abstracted from the detailed view for composition.
The detailed view may reveal dependency loops, which in many domains means that the model cannot be scheduled. To check whether there are such loops, use the getCycleNodes() method. The method returns an array of IOPorts in such loops, or an empty array if there are no such loops. @see FunctionDependency @author Haiyang Zheng @version $Id: FunctionDependencyOfCompositeActor.java,v 1.29 2006/08/21 23:12:46 cxh Exp $ @since Ptolemy II 4.0 @Pt.ProposedRating Green (hyzheng) @Pt.AcceptedRating Green (zhouye)

        if (compositeActor == null) {
            throw new NotSchedulableException(this, "SROptimizedScheduler "
                    + "cannot schedule graph with no container.");
        }


        FunctionDependencyOfCompositeActor functionDependency = (FunctionDependencyOfCompositeActor) compositeActor
                .getFunctionDependency();


        Object[] cycleNodes = functionDependency.getCycleNodes();


        if (cycleNodes.length != 0) {
            StringBuffer names = new StringBuffer();


            for (int i = 0; i < cycleNodes.length; i++) {
                if (cycleNodes[i] instanceof Nameable) {
                    if (i > 0) {
                        names.append(", ");
                    }


                    names.append(((Nameable) cycleNodes[i]).getContainer()
                            .getFullName());
                }
            }


            MessageHandler.error("There are strict cycle loops in the model:"
                    + names.toString() + "\n"
                    + " The results may contain unknowns.  This optimized "
                    + "scheduler does not handle this model. Try the "
                    + "randomized scheduler instead.");
        }


        DirectedAcyclicGraph dependencyGraph = functionDependency
                .getDetailedDependencyGraph().toDirectedAcyclicGraph();


        if (_debugging) {
            _debug("## dependency graph is:" + dependencyGraph.toString());
        }

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        CompositeActor castContainer = (CompositeActor) container;


        // Get the functionDependency attribute of the container of this
        // director. If there is no such attribute, construct one.
        FunctionDependencyOfCompositeActor functionDependency = (FunctionDependencyOfCompositeActor) castContainer
                .getFunctionDependency();


        // NOTE: The following may be a very costly test.
        //       -- from the comments of previous implementations.
        // If the port based data flow graph contains directed
        // loops, the model is invalid. An IllegalActionException
        // is thrown with the names of the actors in the loop.
        Object[] cycleNodes = functionDependency.getCycleNodes();


        if (cycleNodes.length != 0) {
            StringBuffer names = new StringBuffer();


            for (int i = 0; i < cycleNodes.length; i++) {
                if (cycleNodes[i] instanceof Nameable) {
                    if (i > 0) {
                        names.append(", ");
                    }


                    names.append(((Nameable) cycleNodes[i]).getContainer()
                            .getFullName());
                }
            }


            throw new IllegalActionException(this.getContainer(),
                    "Found zero delay loop including: " + names.toString());
        }


        portsGraph = functionDependency.getDetailedDependencyGraph()
                .toDirectedAcyclicGraph();


        return portsGraph;
    }

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     *  @see ptolemy.actor.util.FunctionDependency
     */
    public FunctionDependency getFunctionDependency() {
        if (_functionDependency == null) {
            try {
                _functionDependency = new FunctionDependencyOfCompositeActor(
                        this);
            } catch (NameDuplicationException e) {
                // This should not happen.
                throw new InternalErrorException("Failed to construct a "
                        + "function dependency object for " + getFullName());

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        if (compositeActor == null) {
            throw new NotSchedulableException(this, "No container.");
        }


        FunctionDependencyOfCompositeActor functionDependency = (FunctionDependencyOfCompositeActor) compositeActor
                .getFunctionDependency();


        Object[] cycleNodes = functionDependency.getCycleNodes();


        if (cycleNodes.length != 0) {
            StringBuffer names = new StringBuffer();


            for (int i = 0; i < cycleNodes.length; i++) {
                if (cycleNodes[i] instanceof Nameable) {
                    if (i > 0) {
                        names.append(", ");
                    }
                    names.append(((Nameable) cycleNodes[i]).getContainer()
                            .getFullName());
                }
            }
            throw new NotSchedulableException(director,
                    "There are dependency loops in the model:"
                            + names.toString() + "\n"
                            + " The results may contain unknowns.  This "
                            + "scheduler cannot handle this model.");
        }


        DirectedAcyclicGraph dependencyGraph = functionDependency
                .getDetailedDependencyGraph().toDirectedAcyclicGraph();


        if (_debugging) {
            _debug("## dependency graph is:" + dependencyGraph.toString());
        }

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