public void testHelloWorldProcess() {
// This method shows a process definition and one execution
// of the process definition. The process definition has
// 3 nodes: an unnamed start-state, a state 's' and an
// end-state named 'end'.
// The next line parses a piece of xml text into a
// ProcessDefinition. A ProcessDefinition is the formal
// description of a process represented as a java object.
ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(
"<process-definition>" +
" <start-state>" +
" <transition to='s' />" +
" </start-state>" +
" <state name='s'>" +
" <transition to='end' />" +
" </state>" +
" <end-state name='end' />" +
"</process-definition>"
);
// The next line creates one execution of the process definition.
// After construction, the process execution has one main path
// of execution (=the root token) that is positioned in the
// start-state.
ProcessInstance processInstance =
new ProcessInstance(processDefinition);
// After construction, the process execution has one main path
// of execution (=the root token).
Token token = processInstance.getRootToken();
// Also after construction, the main path of execution is positioned
// in the start-state of the process definition.
assertSame(processDefinition.getStartState(), token.getNode());
// Let's start the process execution, leaving the start-state
// over its default transition.
token.signal();
// The signal method will block until the process execution
// enters a wait state.
// The process execution will have entered the first wait state
// in state 's'. So the main path of execution is now
// positioned in state 's'
assertSame(processDefinition.getNode("s"), token.getNode());
// Let's send another signal. This will resume execution by
// leaving the state 's' over its default transition.
token.signal();
// Now the signal method returned because the process instance
// has arrived in the end-state.
assertSame(processDefinition.getNode("end"), token.getNode());
}