Comments: (13)
That is not a State Machine. |
@Chris, It is nice of you to disagree with this episode. But simply saying this is not a state machine and that is all is very, very lame. I assume you have something of merrit to say or add so please do because if i mis-represented something I would be happy to correct it or do it again. |
public override ToString()
{
return "Is on time:" IsOnTime()+"\r\n"+
"Delay reason:" +DelayReason+"\r\n"+
"Departure time:"+DepartureTime+"\r\n";
} |
Derrick -- wouldn't an implementation of the state pattern mean the the actual "State" class is hidden from the consumer? For example, I would say Flight.TransitState and Flight would delegate off to it's internal state? |
This is not the state pattern. in the state pattern the concrete state will handle the actual state transition and update the context and not what it did here where the context is the one that updated the state. A clear indication how this is not the state pattern is an invalid transition. what if the domain logic says that you must not go from WeatherDelay to InTransit? with the current solution the FlightManager with have to check the current state to not allow the transition to an invalid state. But in the state patter it's the current state itself that does the check. This way if you have a lot of logic in the transitions you don't end up with spagetty if statements in the FlightManager but rather each state knows to handle itself. |
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