MIDIStateManager{

  var <deviceStates;

  *new{
    ^super.new.initManager();
  }

  initManager{
    deviceStates = Array();
  }

  // request a state
  // if a stored and unconnected state is available return that, else return a
  // new MIDIState
  requestState{
    arg name, uid, inPortNum, outPortNum;
    var devicePosition = -1, stateAvailable = false;
    deviceStates.do({|storedDevice, i|
      if((name == storedDevice.name) && (storedDevice.connected.not),{
        stateAvailable = true;
        devicePosition = i;
      });
    });
    if(stateAvailable && (devicePosition >= 0),{
      deviceStates[devicePosition].connected=true;
      ^deviceStates[devicePosition];
    },{
      deviceStates = deviceStates.add(
        MIDIState.new(name, uid, inPortNum, outPortNum)
      );
      ^deviceStates[deviceStates.size-1];
    });
  }

  listStates{
    deviceStates.do({|state, i|
      postln(i.asString++": ["++state.name++", "++state.uid++", "++state.inPortNum++", "++state.outPortNum++", "++state.connected++"]");
    });
  }
}