public void TransitionTo(State toState)
{
var fromState = ActiveState;
var transitionHandlers = PossibleTransitions.AllTransitionsFromTo(fromState, toState);
if (transitionHandlers.Count == 0)
{
throw new Exception("A transition from state " + fromState.Identifier + " to state " +
toState.Identifier + " is not available.");
}
var runnedHandlers = new StateTransitions();
foreach (var transitionHandler in transitionHandlers)
{
var partialTransitionWorked = transitionHandler.PerformTransitionToPointOfPossibleCommit();
runnedHandlers.Add(transitionHandler);
/* When there is at least one handler that is not satisfied, then
* we roll back all handlers and we do not set the new state.
* */
if (!partialTransitionWorked)
{
runnedHandlers.Rollback();
return;
}
}
runnedHandlers.Commit();
ActiveState = toState;
}
public StateMachine(
StateList possibleStates,
State initialState,
StateTransitions possibleTransitions)
{
PossibleStates = possibleStates;
InitialState = initialState;
PossibleTransitions = possibleTransitions;
ActiveState = InitialState;
}
