[jboss-user] [JBoss jBPM] - understand asynchronous continuations

[gujing01@gmail.com]

hello every,
I am a new jbpm comer, and reading the userguide page by page. howevery, i tried my best but could not understand the meaning of "asynchronous continuations", could any one help me about it and examples are great.
here is my simplest example:

  | <?xml version="1.0" encoding="UTF-8"?>
  | <process-definition name="sub">
  | 	<start-state name="start">
  | 		<transition to='wait' />
  | 	</start-state>
  | 	<state name="wait"  async='true' >
  | 		<transition to='end' />
  | 	</state>
  | 	<end-state name="end" />
  | </process-definition>
  | 


  |  ProcessInstance processInstance = 
  |          new ProcessInstance(processDefinition);
  | JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
  | jbpmContext.deployProcessDefinition(processDefinition);
  | jbpmContext.save(processInstance);
  | 		   /////////////////////////////////
  | Token token= processInstance.getRootToken();
  | System.out.println(token.getNode().getName());//START
  | token.signal();
  | System.out.println(token.getNode().getName());//WAIT
  | token.signal();
  | System.out.println(token.getNode().getName());//END
  | 

what is the different with/without " async='true' "

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