Example usage for org.springframework.statemachine.state State shouldDefer

Introduction

In this page you can find the example usage for org.springframework.statemachine.state State shouldDefer.

Prototype

boolean shouldDefer(Message<E> event);

Source Link

Document

Checks if state wants to defer an event.

Usage

From source file:org.springframework.statemachine.support.DefaultStateMachineExecutor.java

private boolean processEventQueue() {
    if (log.isDebugEnabled()) {
        log.debug("Process event queue, size=" + eventQueue.size());
    }/* ww w. j  a  v a  2  s.c o m*/
    Message<E> queuedEvent = eventQueue.poll();
    State<S, E> currentState = stateMachine.getState();
    if (queuedEvent != null) {
        if ((currentState != null && currentState.shouldDefer(queuedEvent))) {
            log.info("Current state " + currentState + " deferred event " + queuedEvent);
            queueDeferredEvent(queuedEvent);
            return true;
        }
        for (Transition<S, E> transition : transitions) {
            State<S, E> source = transition.getSource();
            Trigger<S, E> trigger = transition.getTrigger();

            if (StateMachineUtils.containsAtleastOne(source.getIds(), currentState.getIds())) {
                if (trigger != null
                        && trigger.evaluate(new DefaultTriggerContext<S, E>(queuedEvent.getPayload()))) {
                    queueTrigger(trigger, queuedEvent);
                    return true;
                }
            }
        }
    }
    return false;
}

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From source file:org.springframework.statemachine.support.DefaultStateMachineExecutor.java

private synchronized boolean processDeferList() {
    if (log.isDebugEnabled()) {
        log.debug("Process defer list, size=" + deferList.size());
    }//from ww w. j ava  2  s.c om
    ListIterator<Message<E>> iterator = deferList.listIterator();
    State<S, E> currentState = stateMachine.getState();
    while (iterator.hasNext()) {
        Message<E> event = iterator.next();
        if (currentState.shouldDefer(event)) {
            // if current state still defers, just continue with others
            continue;
        }
        for (Transition<S, E> transition : transitions) {
            State<S, E> source = transition.getSource();
            Trigger<S, E> trigger = transition.getTrigger();
            if (source.equals(currentState)) {
                if (trigger != null && trigger.evaluate(new DefaultTriggerContext<S, E>(event.getPayload()))) {
                    triggerQueue.add(new TriggerQueueItem(trigger, event));
                    iterator.remove();
                    // bail out when first deferred message is causing a trigger to fire
                    return true;
                }
            }
        }
    }
    return false;
}

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