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

org.apache.commons.scxml.invoke.Invoker
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 "targettype" (attribute of <invoke>) with the parent SCXMLExecutor.

The communication link between the parent state machine executor and the invoked activity is a 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 "targettype", 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 "targettype". The invoked activity must not fire any events after the "done" event. The name of the special "done" event must be the ID of the parent state wherein the corresponding <invoke> resides, with the String ".invoke.done" appended.

The Invoker "lifecycle" is outlined below:
1. Instantiation via {@link Class#newInstance()}(Invoker implementation requires accessible constructor).
2. Configuration (setters for parent state ID and {@link SCInstance}).
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.

                errRep.onError(ErrorConstants.EXPRESSION_ERROR, e.getMessage(),
                        oe);
            }
            // check if invoke is active in this state
            if (invokers.containsKey(tt)) {
                Invoker toCancel = (Invoker) invokers.get(tt);
                try {
                    toCancel.cancel();
                } catch (InvokerException ie) {
                    TriggerEvent te = new TriggerEvent(tt.getId()
                        + ".invoke.cancel.failed", TriggerEvent.ERROR_EVENT);
                    internalEvents.add(te);
                }

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        for (Iterator invokeIter = scInstance.getInvokers().entrySet().
                iterator(); invokeIter.hasNext();) {
            Map.Entry iEntry = (Map.Entry) invokeIter.next();
            String parentId = ((TransitionTarget) iEntry.getKey()).getId();
            if (!finalizeMatch(parentId, allEvents)) { // prevent cycles
                Invoker inv = (Invoker) iEntry.getValue();
                try {
                    inv.parentEvents(events);
                } catch (InvokerException ie) {
                    appLog.error(ie.getMessage(), ie);
                    throw new ModelException(ie.getMessage(), ie.getCause());
                }
            }

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                PathResolver pr = i.getPathResolver();
                if (pr != null) {
                    source = i.getPathResolver().resolvePath(src);
                }
                String ttype = i.getTargettype();
                Invoker inv = null;
                try {
                    inv = scInstance.newInvoker(ttype);
                } catch (InvokerException ie) {
                    TriggerEvent te = new TriggerEvent(s.getId()
                        + ".invoke.failed", TriggerEvent.ERROR_EVENT);
                    internalEvents.add(te);
                    continue;
                }
                inv.setParentStateId(s.getId());
                inv.setSCInstance(scInstance);
                List params = i.params();
                Map args = new HashMap();
                for (Iterator pIter = params.iterator(); pIter.hasNext();) {
                    Param p = (Param) pIter.next();
                    String argExpr = p.getExpr();
                    Object argValue = null;
                    ctx.setLocal(NAMESPACES_KEY, p.getNamespaces());
                    // Do we have an "expr" attribute?
                    if (argExpr != null && argExpr.trim().length() > 0) {
                        // Yes, evaluate and store as parameter value
                        try {
                            argValue = eval.eval(ctx, argExpr);
                        } catch (SCXMLExpressionException see) {
                            errRep.onError(ErrorConstants.EXPRESSION_ERROR,
                                see.getMessage(), i);
                        }
                    } else {
                        // No. Does value of "name" attribute refer to a valid
                        // location in the data model?
                        try {
                            argValue = eval.evalLocation(ctx, p.getName());
                            if (argValue == null) {
                                // Generate error, 4.3.1 in WD-scxml-20080516
                                TriggerEvent te = new TriggerEvent(s.getId()
                                    + ERR_ILLEGAL_ALLOC,
                                    TriggerEvent.ERROR_EVENT);
                                internalEvents.add(te);
                            }
                        } catch (SCXMLExpressionException see) {
                            errRep.onError(ErrorConstants.EXPRESSION_ERROR,
                                see.getMessage(), i);
                        }
                    }
                    ctx.setLocal(NAMESPACES_KEY, null);
                    args.put(p.getName(), argValue);
                }
                try {
                    inv.invoke(source, args);
                } catch (InvokerException ie) {
                    TriggerEvent te = new TriggerEvent(s.getId()
                        + ".invoke.failed", TriggerEvent.ERROR_EVENT);
                    internalEvents.add(te);
                    continue;

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        Class invokerClass = (Class) invokerClasses.get(targettype);
        if (invokerClass == null) {
            throw new InvokerException("No Invoker registered for "
                + "targettype \"" + targettype + "\"");
        }
        Invoker invoker = null;
        try {
            invoker = (Invoker) invokerClass.newInstance();
        } catch (InstantiationException ie) {
            throw new InvokerException(ie.getMessage(), ie.getCause());
        } catch (IllegalAccessException iae) {

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                errRep.onError(ErrorConstants.EXPRESSION_ERROR, e.getMessage(),
                        oe);
            }
            // check if invoke is active in this state
            if (invokers.containsKey(tt)) {
                Invoker toCancel = (Invoker) invokers.get(tt);
                try {
                    toCancel.cancel();
                } catch (InvokerException ie) {
                    TriggerEvent te = new TriggerEvent(tt.getId()
                        + ".invoke.cancel.failed", TriggerEvent.ERROR_EVENT);
                    internalEvents.add(te);
                }

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        for (Iterator invokeIter = scInstance.getInvokers().entrySet().
                iterator(); invokeIter.hasNext();) {
            Map.Entry iEntry = (Map.Entry) invokeIter.next();
            String parentId = ((TransitionTarget) iEntry.getKey()).getId();
            if (!finalizeMatch(parentId, eventNames)) { // prevent cycles
                Invoker inv = (Invoker) iEntry.getValue();
                try {
                    inv.parentEvents(events);
                } catch (InvokerException ie) {
                    appLog.error(ie.getMessage(), ie);
                    throw new ModelException(ie.getMessage(), ie.getCause());
                }
            }

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                PathResolver pr = i.getPathResolver();
                if (pr != null) {
                    source = i.getPathResolver().resolvePath(src);
                }
                String ttype = i.getTargettype();
                Invoker inv = null;
                try {
                    inv = scInstance.newInvoker(ttype);
                } catch (InvokerException ie) {
                    TriggerEvent te = new TriggerEvent(s.getId()
                        + ".invoke.failed", TriggerEvent.ERROR_EVENT);
                    internalEvents.add(te);
                    continue;
                }
                inv.setParentStateId(s.getId());
                inv.setSCInstance(scInstance);
                List params = i.params();
                Map args = new HashMap();
                for (Iterator pIter = params.iterator(); pIter.hasNext();) {
                    Param p = (Param) pIter.next();
                    String argExpr = p.getExpr();
                    Object argValue = null;
                    if (argExpr != null && argExpr.trim().length() > 0) {
                        try {
                            ctx.setLocal(NAMESPACES_KEY, p.getNamespaces());
                            argValue = eval.eval(ctx, argExpr);
                            ctx.setLocal(NAMESPACES_KEY, null);
                        } catch (SCXMLExpressionException see) {
                            errRep.onError(ErrorConstants.EXPRESSION_ERROR,
                                see.getMessage(), i);
                        }
                    }
                    args.put(p.getName(), argValue);
                }
                try {
                    inv.invoke(source, args);
                } catch (InvokerException ie) {
                    TriggerEvent te = new TriggerEvent(s.getId()
                        + ".invoke.failed", TriggerEvent.ERROR_EVENT);
                    internalEvents.add(te);
                    continue;

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        Class invokerClass = (Class) invokerClasses.get(targettype);
        if (invokerClass == null) {
            throw new InvokerException("No Invoker registered for "
                + "targettype \"" + targettype + "\"");
        }
        Invoker invoker = null;
        try {
            invoker = (Invoker) invokerClass.newInstance();
        } catch (InstantiationException ie) {
            throw new InvokerException(ie.getMessage(), ie.getCause());
        } catch (IllegalAccessException iae) {

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                errRep.onError(ErrorReporter.EXPRESSION_ERROR, e.getMessage(),
                        oe);
            }
            // check if invoke is active in this state
            if (invokers.containsKey(tt)) {
                Invoker toCancel = (Invoker) invokers.get(tt);
                try {
                    toCancel.cancel();
                } catch (InvokerException ie) {
                    TriggerEvent te = new TriggerEvent(tt.getId()
                        + ".invoke.cancel.failed", TriggerEvent.ERROR_EVENT);
                    internalEvents.add(te);
                }

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        for (Iterator invokeIter = scInstance.getInvokers().entrySet().
                iterator(); invokeIter.hasNext();) {
            Map.Entry iEntry = (Map.Entry) invokeIter.next();
            String parentId = ((TransitionTarget) iEntry.getKey()).getId();
            if (!finalizeMatch(parentId, eventNames)) { // prevent cycles
                Invoker inv = (Invoker) iEntry.getValue();
                try {
                    inv.parentEvents(events);
                } catch (InvokerException ie) {
                    appLog.error(ie.getMessage(), ie);
                    throw new ModelException(ie.getMessage(), ie.getCause());
                }
            }

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Related Classes of org.apache.commons.scxml.invoke.Invoker

org.apache.commons.scxml.SCInstance

org.apache.commons.scxml.semantics.SCXMLSemanticsImpl

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