Examples of org.apache.commons.scxml2.invoke.Invoker

Package org.apache.commons.scxml2.invoke

Examples of org.apache.commons.scxml2.invoke.Invoker

org.apache.commons.scxml2.model.SimpleTransition
The Invoker interface is used to define the possible interactions between the parent state machine (executor) and the types of invocable activities.

Invocable activities must first register an Invoker implementation class for the appropriate "target" (attribute of <invoke>) with the parent SCXMLParentIOProcessor.

The communication link between the parent state machine executor and the invoked activity is a asynchronous bi-directional events pipe.

All events triggered on the parent state machine get forwarded to the invoked activity. The processing semantics for these events depend upon the "target", and thereby vary per concrete implementation of this interface.

The invoked activity in turn must fire a special "done" event when it concludes. It may fire additional events before the "done" event. The semantics of any additional events depend upon the "target". The invoked activity must not fire any events after the "done" event. The name of the special "done" event must be "done.invoke.id" with the ID of the parent state wherein the corresponding <invoke> resides,

The Invoker "lifecycle" is outlined below:
1. Instantiation via {@link Class#newInstance()}(Invoker implementation requires accessible constructor).
2. Configuration (setters for invoke ID and {@link org.apache.commons.scxml2.SCXMLIOProcessor}).
3. Initiation of invoked activity via invoke() method, passing the source URI and the map of params.
4. Zero or more bi-directional event triggering.
5. Either completion or cancellation.
Note: The semantics of <invoke> are necessarily asynchronous, tending towards long(er) running interactions with external processes. Implementations cannot communicate with the parent state machine executor in a synchronous manner. For synchronous communication semantics, use <event> or custom actions instead.

     * @param errorReporter The error reporter for this state machine instance.
     * @throws ModelException if an attempt is made to set a null value for the error reporter
     */
    protected void setErrorReporter(ErrorReporter errorReporter) throws ModelException {
        if (errorReporter == null) {
            throw new ModelException(ERR_NO_ERROR_REPORTER);
        }
        this.errorReporter = errorReporter;
    }

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     * @param stateMachine The state machine for this instance
     * @throws ModelException if an attempt is made to set a null value for the state machine
     */
    protected void setStateMachine(SCXML stateMachine) throws ModelException {
        if (stateMachine == null) {
            throw new ModelException(ERR_NO_STATE_MACHINE);
        }
        if (this.stateMachine != null && initialized) {
            this.stateMachine = stateMachine;
            // change of state machine after initialization: re-initialize
            initialize();

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        MessageFormat msgFormat = new MessageFormat(errType);
        String errMsg = msgFormat.format(msgArgs);
        org.apache.commons.logging.Log log = LogFactory.
                getLog(ModelUpdater.class);
        log.error(errMsg);
        throw new ModelException(errMsg);
    }

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                writer.writeStartElement(XMLNS_SCXML, ELEM_LOG);
                writeAV(writer, ATTR_LABEL, lg.getLabel());
                writeAV(writer, ATTR_EXPR, escapeXML(lg.getExpr()));
                writer.writeEndElement();
            } else if (a instanceof Raise) {
                Raise e = (Raise) a;
                writer.writeStartElement(XMLNS_SCXML, ELEM_RAISE);
                writeAV(writer, ATTR_EVENT, e.getEvent());
                writer.writeEndElement();
            } else if (a instanceof Script) {
                Script s = (Script) a;
                writer.writeStartElement(XMLNS_SCXML, ELEM_SCRIPT);
                writer.writeCData(s.getScript());

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    /**
     * {@inheritDoc}.
     */
    public void invoke(final String source, final Map<String, Object> params)
    throws InvokerException {
        SCXML scxml;
        try {
            scxml = SCXMLReader.read(new URL(source));
        } catch (ModelException me) {
            throw new InvokerException(me.getMessage(), me.getCause());
        } catch (IOException ioe) {

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        // Marker to indicate generated document
        writer.writeComment(XMLNS_COMMONS_SCXML);


        // Write global script if defined
        if (scxml.getGlobalScript() != null) {
            Script s = scxml.getGlobalScript();
            writer.writeStartElement(XMLNS_SCXML, ELEM_SCRIPT);
            writer.writeCData(s.getScript());
            writer.writeEndElement();
        }


        // Children
        writeDatamodel(writer, scxml.getDatamodel());

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                Raise e = (Raise) a;
                writer.writeStartElement(XMLNS_SCXML, ELEM_RAISE);
                writeAV(writer, ATTR_EVENT, e.getEvent());
                writer.writeEndElement();
            } else if (a instanceof Script) {
                Script s = (Script) a;
                writer.writeStartElement(XMLNS_SCXML, ELEM_SCRIPT);
                writer.writeCData(s.getScript());
                writer.writeEndElement();
            } else if (a instanceof If) {
                writeIf(writer, (If) a);
            } else if (a instanceof Else) {
                writer.writeEmptyElement(ELEM_ELSE);

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     */
    static void updateSCXML(final SCXML scxml) throws ModelException {
        initDocumentOrder(scxml.getChildren(), 1);


        String initial = scxml.getInitial();
        SimpleTransition initialTransition = new SimpleTransition();


        if (initial != null) {


            initialTransition.setNext(scxml.getInitial());
            updateTransition(initialTransition, scxml.getTargets());


            if (initialTransition.getTargets().size() == 0) {
                logAndThrowModelError(ERR_SCXML_NO_INIT, new Object[] {
                        initial });
            }
        } else {
            // If 'initial' is not specified, the default initial state is
            // the first child state in document order.
            initialTransition.getTargets().add(scxml.getFirstChild());
        }


        scxml.setInitialTransition(initialTransition);
        Map<String, TransitionTarget> targets = scxml.getTargets();
        for (EnterableState es : scxml.getChildren()) {

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            Initial ini = state.getInitial();
            if (ini == null) {
                state.setFirst(children.get(0).getId());
                ini = state.getInitial();
            }
            SimpleTransition initialTransition = ini.getTransition();
            updateTransition(initialTransition, targets);
            Set<TransitionTarget> initialStates = initialTransition.getTargets();
            // we have to allow for an indirect descendant initial (targets)
            //check that initialState is a descendant of s
            if (initialStates.size() == 0) {
                logAndThrowModelError(ERR_STATE_BAD_INIT,
                        new Object[] {getName(state)});

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     */
    private static void updateHistory(final History history,
                                      final Map<String, TransitionTarget> targets,
                                      final TransitionalState parent)
            throws ModelException {
        SimpleTransition transition = history.getTransition();
        if (transition == null || transition.getNext() == null) {
            logAndThrowModelError(ERR_HISTORY_NO_DEFAULT,
                    new Object[] {history.getId(), getName(parent)});
        }
        else {
            updateTransition(transition, targets);
            Set<TransitionTarget> historyStates = transition.getTargets();
            if (historyStates.size() == 0) {
                logAndThrowModelError(ERR_STATE_NO_HIST,
                        new Object[] {getName(parent)});
            }
            for (TransitionTarget historyState : historyStates) {

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