Querying ExclusiveGateway and other gateways.

[kethur]

Hi Team,

I am not able to find an API to query the Exclusive Gateway.  For example if i want all the flows leaving from an exclusive gateway, what API call should i use?

I can see this from the bpmn xml but, i want an api which can give me the above behavior.

Thanks in advance,
Raj

[jbarrez]

One way is to override the ExclusiveGatewayBehavior and add your own logic:

example from the userguide:


  public void execute(ActivityExecution execution) throws Exception {
    String var = (String) execution.getVariable("var");

    PvmTransition transition = null;
    try {
      executeLogic(var);
      transition = execution.getActivity().findOutgoingTransition("no-exception");
    } catch (Exception e) {
      transition = execution.getActivity().findOutgoingTransition("exception");
    }
    execution.take(transition);
  }


[kethur]

But I think this is for different purpose.  To use this, i have to start the process and then, until the process reaches to that task it wont get executed.  Am i right?.  It gets even harder if i have more gateways.  But my requirement is to query the gateways without going there.

By looking at the xml i can see and understand which are the flows that are coming out of the exclusive gateway.  All i need is an API which can give me the transitions.  I am not sure if this API is there in the current version or it will be done in the future versions of Activiti.

For now, my option is to write a custom parser to parse the xml to get the above thing done.  Could you let me know if there is a better way please?

Thanks,
Raj

[frederikherema1]

Try using repositoryServiceImpl.getDeployedProcessDefinition(id) and run through the activity-tree and transitions, starting at ReadonlyProcessDefinition.getInitial().