/HelloMediatorDesignPattern

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HelloMediatorDesignPattern

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Procedures for train entering station

  1. train call requestArrival to enter station.
  2. mediator will check availability of the station ,when station is vacant the train will be allowed to enter otherwise has to queue.
  3. When the occupying train leaves station the mediator will notify the first train in the trainQueue to enter the station by calling permitArrival().
  4. mediator contains lock means only one of canLand and notifyFree can be called at a time.