/**
* Make a process step, i.e. find the next edge or activity for a just executed thread.
*
* @param activity The activity to execute.
* @param instance The process instance.
* @param thread The process thread.
*/
public void step(
MActivity activity, BpmnInterpreter instance, ProcessThread thread, Object event) {
// System.out.println(instance.getComponentIdentifier().getLocalName()+": step "+activity+",
// data "+thread.getData());
// Hack!!! Should be in interpreter/thread?
thread.updateParametersAfterStep(activity, instance);
MNamedIdElement next = null;
ThreadContext remove = null; // Context that needs to be removed (if any).
Exception ex = thread.getException();
// Store event (if any).
if (event != null) {
thread.setParameterValue("$event", event);
// System.out.println("Event: "+activity+" "+thread+" "+event);
}
// Timer occurred flow
if (AbstractEventIntermediateTimerActivityHandler.TIMER_EVENT.equals(event)) {
// Cancel subflows.
remove = thread.getThreadContext().getSubcontext(thread);
// Continue with timer edge.
List outedges = activity.getOutgoingSequenceEdges();
if (outedges != null && outedges.size() == 1) {
next = (MSequenceEdge) outedges.get(0);
} else if (outedges != null && outedges.size() > 1) {
throw new RuntimeException("Cannot determine outgoing edge: " + activity);
}
}
// Find next element and context(s) to be removed.
else {
boolean outside = false;
ThreadContext context = thread.getThreadContext();
while (next == null && !outside) {
// Normal flow
if (ex == null) {
List outgoing = activity.getOutgoingSequenceEdges();
if (outgoing != null && outgoing.size() == 1) {
next = (MSequenceEdge) outgoing.get(0);
} else if (outgoing != null && outgoing.size() > 1) {
throw new UnsupportedOperationException(
"Activity has more than one one outgoing edge. Please overridge step() for disambiguation: "
+ activity);
}
// else no outgoing edge -> check parent context, if any.
}
// Exception flow.
else {
List handlers = activity.getEventHandlers();
for (int i = 0; handlers != null && next == null && i < handlers.size(); i++) {
MActivity handler = (MActivity) handlers.get(i);
if (handler.getActivityType().equals("EventIntermediateError")) {
// Todo: match exception types.
// Class clazz = handler.getName()!=null ? SReflect.findClass0(clname, imports,
// classloader);
next = handler;
}
}
}
outside = context.getParent() == null;
if (next == null && !outside) {
// When last thread or exception, mark current context for removal.
if (context.getThreads().size() == 1 || ex != null) {
activity = (MActivity) context.getModelElement();
remove = context;
context = context.getParent();
// Cancel subprocess handlers.
if (activity instanceof MSubProcess) {
List handlers = activity.getEventHandlers();
for (int i = 0; handlers != null && i < handlers.size(); i++) {
MActivity handler = (MActivity) handlers.get(i);
instance
.getActivityHandler(handler)
.cancel(handler, instance, remove.getInitiator());
}
}
}
// If more threads are available in current context just exit loop.
else if (context.getThreads().size() > 1) {
outside = true;
}
}
}
}
// Remove inner context(s), if any.
if (remove != null) {
thread = remove.getInitiator();
thread.setNonWaiting();
// Todo: Callbacks for aborted threads (to abort external activities)
thread.getThreadContext().removeSubcontext(remove);
}
if (next != null) {
// Todo: store exception as parameter!?
if (ex != null) thread.setException(null);
} else if (ex != null) {
if (ex instanceof RuntimeException) throw (RuntimeException) ex;
else throw new RuntimeException("Unhandled exception in process: " + activity, ex);
}
// Perform step settings, i.e. set next edge/activity or remove thread.
if (next instanceof MSequenceEdge) {
thread.setLastEdge((MSequenceEdge) next);
} else if (next instanceof MActivity) {
thread.setActivity((MActivity) next);
} else if (next == null) {
thread.getThreadContext().removeThread(thread);
} else {
throw new UnsupportedOperationException("Unknown outgoing element type: " + next);
}
}
