Package eu.bandm.tools.message

Class TrafficMessageReceiver

java.lang.Object
eu.bandm.tools.message.TrafficMessageReceiver
All Implemented Interfaces:
MessageReceiver<Message>
public class TrafficMessageReceiver extends Object implements MessageReceiver<Message>
Graphic indication of received messages.

One or more TrafficLight objects can be linked to this kind of message receiver. The state of all these is changed to "red" as soon as a critical message arrives, and to "yellow" as soon as any other message arrives---provided the state is not red.
As long as no message arrives, the intial state is left unchanged.

  • Constructor Details

    • TrafficMessageReceiver

      public TrafficMessageReceiver()
      Only constructor

  • Method Details

    • addLight

      public void addLight(TrafficLight light)
      Add the given traffic light a listener to state changes.
      Parameters:
      light - added as listener

    • removeLight

      public void removeLight(TrafficLight light)
      Removes the given light as a listener to state changes.
      Parameters:
      light - removed as listener

    • createLight

      public TrafficLight createLight()
      Convenience: constructs a new traffic light and adds it as listener
      Returns:
      a new traffic light

    • clear

      public void clear()
      Convenience: set state of all currently added traffic lights to "green".

    • receive

      public void receive(Message msg)
      Sets state to TrafficLight.State.red if the received message is critcal, otherwise to yellow, if it is not already red.
      Specified by:
      receive in interface MessageReceiver<Message>
      Parameters:
      msg - the message to receive.
      See Also:

    • getState

      public TrafficLight.State getState()
      Return the current state.
      Returns:
      the current state.

    • setState

      protected void setState(TrafficLight.State state)
      Convenience: change the state of all currently added traffic lights to the given state.
      Parameters:
      state - the new state of all traffic lights