Signal Mediator Class - Exercise

Course Project, Part 6

Objective: Write a SignalMediator class for the intersection that manages the four lights.

The SignalMediator is responsible for queuing requests and making sure that each light is green for a minimum amount of time. Furthermore, the mediator should provide access to the individual lights. The basic algorithm you want to implement has seven states that are cycled through in the following order. You can play with the minimum and maximum times if you like, but you must keep this order.

State	East	West	North	South	walk request	Min	Max
1	Go	Go	Stop	Stop	false	120	Inf
2	Go	Go	Stop	Stop	true	0	60
3	Caution	Caution	Stop	Stop	true	12	12
4	Stop	Stop	Stop	Stop	true	5	5
5	Stop	Stop	Go	Go	false	60	60
6	Stop	Stop	Caution	Caution	false	20	20
7	Stop	Stop	Stop	Stop	false	5	5
1	Go	Go	Stop	Stop	false	120	inf

The Inf in state one means that the east-west lights stay green until a pedestrian on the north-south direction explicitly requests a walk signal. This is one of the most important classes in the system. It also offers many options for how it is written, so I am going to leave the exact details open. In the text area below, type or paste your answer and click the Submit button.