[jbpm-dev] [Design of JBoss jBPM] - Re: Wait States a conceptual question

[alex.guizar@jboss.com]

Just as Bernd says, control is propagated in a chain of responsibility from node to transition to node until a node stops propagating. The latter node will be the wait state. The call stack is:

node.execute()
  | ->node.leave(Transition)
  |   ->transition.take()
  |     ->node.enter()
  |       ->node.execute()

As a side note, in jBPM 3 this simple propagation model has indirect recursion and may result in a stack overflow if a wait state is not encountered soon enough. This has been addressed in PVM.

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