[jboss-user] [JBoss jBPM] - Re: Do we really need

[deepuin9]

 Hi bungrudi ,

I was trying to do something similar to what you are talking about. My idea is to have a node using which I should be able to define the transitions at runtime.

Have a look at the sample process definition below, if you observe state 3 does not have any transition.

<?xml version="1.0" encoding="UTF-8"?>
  | <process-definition  xmlns=""  name="statetrans">
  | 	<start-state name="start-state1">
  | 		<transition to="state1"></transition>
  | 	</start-state>
  | 
  | 	<state name="state1">
  | 		<transition to="state2"></transition>
  | 	</state>
  | 
  | 	<state name="state2">
  | 		<transition to="end-state1"></transition>
  | 		<transition to="state1" name="to state1"></transition>
  | 	</state>
  | 
  | 	<state name="state3"></state>
  | 
  | 	<end-state name="end-state1"></end-state>
  | </process-definition>

In the below test case, I tried to added the transition at runtime and it worked :) . Now I am in the process of building my custom node :)

public void testAddingTransitionsToState3AtRuntime() {
  | 		Node node3 = processDefinition.getNode("state3");
  | 		Node node2 = processDefinition.getNode("state2");
  | 		Node end = processDefinition.getNode("end-state1");
  | 
  | 
  | 		Token token = processInstance.getRootToken();
  | 		assertEquals("start-state1", token.getNode().getName());
  | 
  | 		processInstance.signal();
  | 		assertEquals("state1", token.getNode().getName());
  | 
  | 		//Ideally I would like to add new transition from state1 to state3
  | 		Transition trans = processInstance.getRootToken().getNode()
  | 				.getDefaultLeavingTransition();
  | 		Node to = trans.getTo();
  | 		Node from = trans.getFrom();
  | 		System.out.println("from " + from.getName() + " to " + to.getName());
  | 
  | 		trans.setTo(node3);
  | 		processInstance.signal();
  | 		assertEquals("state3", token.getNode().getName());
  | 		//As state 3 does not have any transition defined it will return null
  | 		Transition leavingTransitionState3 = processInstance.getRootToken().getNode()
  | 				.getDefaultLeavingTransition();
  | 		//Creating new transition.
  | 		leavingTransitionState3 = new Transition("test");
  | 		leavingTransitionState3.setTo(node2);
  | 		leavingTransitionState3.setFrom(node3);
  | 		processInstance.getRootToken().getNode().addLeavingTransition(leavingTransitionState3);
  | 		System.out.println("from " + leavingTransitionState3.getFrom().getName() + " to " + leavingTransitionState3.getTo().getName());
  | 
  | 		processInstance.signal();
  | 		assertEquals("state2", token.getNode().getName());
  | 		processInstance.signal();
  | 		assertEquals("end-state1", token.getNode().getName());
  | 	}
  | [/url]

Hope it helped.

Thanks
Sandeep

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