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Description of the architecture and API

Frontend

The frontend is realized with javascript and svg. The intersection is a svg-file which can easily be manipulated via javascript. If the user has selected all his lanes and settings a js-script collects the current state of the intersection. For exchanging data between frontend and backend we chose JSON. The JSON-Object contains the all the lanes and the algorithm the user selected.

{
	"Settings": {
		"Algorithm": enum //BASIC_GREEDY=0, WELSH_POWELL=1, BRON_KERBOSCH=2
	},
	"Intersection": {
		"Top": {
			"RightLane": boolean,
			"StraightLane": boolean,
			"LeftLane": boolean,
			"Pedestrian": enum //OFF=0, NORMAL= 1, WITH_ISLAND=2
		},
		"Right": {
			"RightLane": boolean,
			"StraightLane": boolean,
			"LeftLane": boolean,
			"Pedestrian": enum //OFF=0, NORMAL= 1, WITH_ISLAND=2
		},
		"Buttom": {
			"RightLane": boolean,
			"StraightLane": boolean,
			"LeftLane": boolean,
			"Pedestrian": enum //OFF=0, NORMAL= 1, WITH_ISLAND=2
		},
		"Left": {
			"RightLane": boolean,
			"StraightLane": boolean,
			"LeftLane": boolean,
			"Pedestrian": enum //OFF=0, NORMAL= 1, WITH_ISLAND=2
		}
	}
}

Via AJAX a request with the JSON is sent to the backend. After receiving the response some parts of the page are replace with the results. For a better visiualization of the results the user can switch between the different traffic light phases via radio buttons.

Backend

The backend is divided in a viewHandler and a jsonInterfaceHandler. The viewHandler delivers all the static files which are requested by the frontend (html-files, css-files and js-files). Requests to /json are handled by the jsonInterfaceHandler. The algorithmHandler forwards the request to the corresponding graph algorithm.

JSON-Requests get a JsonResponse-Object as response. The response contains a two-dimensional array. Each inner-array represents a traffic-light-phase with all the non-conflicting nodes.

type JsonResponse struct {
	ReceivedDataSuccessful bool
	TrafficLightPhases     [][]string
}

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