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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

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Comments

jbarrez

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

example from the userguide:

<br>&nbsp; public void execute(ActivityExecution execution) throws Exception {<br>&nbsp;&nbsp;&nbsp; String var = (String) execution.getVariable("var");<br><br>&nbsp;&nbsp;&nbsp; PvmTransition transition = null;<br>&nbsp;&nbsp;&nbsp; try {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; executeLogic(var);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; transition = execution.getActivity().findOutgoingTransition("no-exception");<br>&nbsp;&nbsp;&nbsp; } catch (Exception e) {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; transition = execution.getActivity().findOutgoingTransition("exception");<br>&nbsp;&nbsp;&nbsp; }<br>&nbsp;&nbsp;&nbsp; execution.take(transition);<br>&nbsp; }<br>

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().