/**
* Post the event to be evaluated. The event is blocking, meaning that it will cause the caller to
* continue execution until the event is processed.
*
* @param entity - the target of the event
* @param event - the event event
* @param arguments - the arguments to the event
* @return
* @throws Throwable
*/
@Override
public Object postContinuingEvent(EntityReference entity, int event, Object... arguments)
throws Throwable {
assert blockingEvent == null;
assert currentEvent != null;
if (restoreFrame()) {
returnFrame = null;
return currentEvent.getContinuation().returnFrom();
}
blockingEvent = createEvent(currentTime, entity, event, arguments);
continuingEvent = currentEvent.clone(currentTime);
currentFrame = BASE;
return null;
}
/**
* The heart of the event processing loop. This is where the events are actually evaluated.
*
* @param next - the event to evaluate.
* @throws SimulationException - if an exception occurs during the evaluation of the event.
*/
protected void evaluate(EventImpl next) throws SimulationException {
currentEvent = next;
currentTime = currentEvent.getTime();
Continuation continuation = currentEvent.getContinuation();
if (continuation != null) {
returnFrame = continuation.getFrame();
caller = continuation.getCaller();
}
Throwable exception = null;
Object result = null;
try {
if (eventLog != null) {
eventLog.info(currentEvent.toString());
}
result = currentEvent.invoke();
} catch (SimulationEnd e) {
throw e;
} catch (Throwable e) {
if (caller == null || blockingEvent != null) {
throw new SimulationException(e);
}
exception = e;
} finally {
currentEvent = null;
}
if (blockingEvent != null) {
continuingEvent.setContinuation(new Continuation(caller, currentFrame));
blockingEvent.setContinuation(new Continuation(continuingEvent));
post(blockingEvent);
blockingEvent = null;
continuingEvent = null;
currentFrame = null;
} else if (caller != null) {
post(caller.resume(currentTime, result, exception));
}
caller = null;
returnFrame = null;
}