doIt
void doIt(FSM fsm,
Input in)
Called by the state engine to perform an action before a state transition takes place. The FSM is passed so that
the Action may set the next state in cases when that is required. FSM and Input together allow actions to be
written that depend on the state and input, but this should generally be avoided, as the reason for a state
machine in the first place is to cleanly separate the actions and control flow. Note that an action should
complete in a timely manner. If the state machine is used for concurrency control with multiple threads, the
action must not allow multiple threads to run simultaneously in the state machine, as the state could be
corrupted. Any exception thrown by the Action for the transition will be propagated to doIt.
- Parameters:
FSM - fsm is the state machine causing this action.Input - in is the input that caused the transition.