How do I determine if parallel executions are completed (serviceTask/receiveTask partners)

As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.

smith9

I am evaluating Activiti and have a process that is like
Start -> Render Documents (Parallel ServiceTask) -> Render Documents Completed (Parallel ReceiveTask) -> Do Rest of tasks -> End

The process is passed a variable containing the list of documents to be rendered and the rendering process is asynchronous so need to call back when it is completed.

How do I mark off each document as being completed.

My first thought was just to use cardinality and send N signals to the Render Documents Completed (Parallel ReceiveTask)
This has the drawback that if a document happened to be rendered twice for what ever reason, the completion may miss the last documents callback.

Is there an easyway that I can achive something like: signal "document name"

Hope the above is clear enough.

smith9

What I came up with in the end was to use a TaskActivityBehaviour class which combines both service and receive tasks in to one step. Then as each document finishes rendering (receiving a JMS message), I can then signal from the JMS on message to the waiting activiti step.

<code>public class SnsStep extends TaskActivityBehavior {
    private final Logger log = LoggerFactory.getLogger(getClass());

    @Override
    public void execute(ActivityExecution execution) throws Exception {
        log.info("Running Step " + execution.getCurrentActivityName());
    }

    @Override
    public void signal(ActivityExecution execution, String signalName, Object signalData) throws Exception {
        leave(execution);
    }
}
<code>

Is using the TaskActivityBehavior the ideal way to do this?