Elevator Control System

The steps used to allocate an elevator for a pick up are:

1. Find an elevator that is stationary
2. If not found, find elevator which is going for a pickup and whose direction after pick up is in the same direction as the request
3. If not found, find the elevator that is going in the direction that the user wants to go and which is not in a pick up mode. No optimisation for an elevator that is going to pickup someone

If you see the contract for request(req: PickupRequest), you can see that the return type is Elevator | Error. This was a conscious decision to avoid going into a rabit-hole. I could not find out a proper way of assigning an elevator when all the above 3 steps fail to assign an elevator.

Run Simulation

sbt console
:load pre-loaded-elevator-control-system.scala

controlSystem.step
controlSystem.status

The file pre-loaded-elevator-control-system.scala is included in the zip. Feel free to change it's contents as per your needs. Once the file is loaded you will have all the imports and controlSystem in scope.

Tests

The code includes test for ElevatorStatus and ElevatorControlSystemImpl. To run the tests, execute

sbt test

Language

The system is implemented in Dotty (Scala 3)