Multi-instance sub process completion concurrency problem

ochrons — Fri, 18 May 2012 17:52:42 GMT

I've got a multi-instance sub process defined which contains Java service tasks and timers. The timers are used for polling an external service (through a Java service task). If the results are not ready, the process will go back into the timer to wait.Now, because of the timers, Activiti will use i

Re: Multi-instance sub process completion concurrency problem

ochrons — Wed, 23 May 2012 05:53:25 GMT

So, I solved this with a workaround involving an additional Java Receive Task and a separate thread in my code that just signals that state whenever it's encountered.

Task definition in the process XML:
<receiveTask id="syncProcess" name="Sync"></receiveTask>
Code that creates a thread and checks for any process executions in that wait state and signals them:


private RuntimeService runtimeService;
private Set<String> waitingProcesses = Collections.synchronizedSet(new HashSet<String>());
.
.
// create a thread for signaling waiting executions
Thread signalThread = new Thread(new Runnable() {
    @Override
    public void run() {
        while (true) {
            synchronized (waitingProcesses) {
                Iterator<String> iterator = waitingProcesses.iterator();
                while (iterator.hasNext()) {
                    String processId = iterator.next();
                    List<Execution> executions = runtimeService.createExecutionQuery().processInstanceId(processId)
                            .activityId("syncProcess").list();
                    for (Execution exec : executions) {
                        log.debug("Signaling waiting execution {}", exec.getId());
                        runtimeService.signal(exec.getId());
                    }
                }
            }
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                return;
            }
        }
    }
});
signalThread.start();

Would be great if there was a real solution to this problem instead of this kind of hack

- Otto

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Multi-instance sub process completion concurrency problem

Re: Multi-instance sub process completion concurrency problem