{
    init: function(elevators, floors) {
        var requests = [];
        floors.forEach(function(floor) {
            floor.on("up_button_pressed", function() {
                requests.push(floor);
            });
            floor.on("down_button_pressed", function() {
                requests.push(floor);
            });
        });

        elevators.forEach(function(elevator) {
            var free = true;
        // Whenever the elevator is idle (has no more queued destinations) ...
            elevator.on("idle", function() {
                // let's go to all the floors (or did we forget one?)
                if(free && requests.length > 0) {
                    elevator.goToFloor(requests[0].floorNum());
                    requests.shift();
                    free = false;
                }
            });

            elevator.on("floor_button_pressed", function(floorNum) {
                elevator.goToFloor(floorNum);
                free = false;
            });

            elevator.on("stopped_at_floor", function(floorNum) {
                free = true;
            })

            /*elevator.on("up_button_pressed", function() {
                elevator.goToFloor(floorNum);
            });*/
        });
     },
     update: function(dt, elevators, floors) {
         // We normally don't need to do anything here
     }
}