Coding Challenge

Carpark Ubi

Basic Idea

1. As many cars as possible should be charged in fast charging mode.
2. A car occupies fast charging mode for the longest time will be switched to slow charging mode.
3. A car occupies slow charging mode for the longest time will be switched to fast charging mode.

How to run the Application

$ ./gradlew bootRun

The default port is 8080.

If an API call is invoked a message like the following will be printed.

2019-05-21 12:02:49.464  INFO 86473 --- [nio-8080-exec-1] c.c.c.c.ChargingPointController          : CP1 sends a notification that a car is plugged
2019-05-21 12:02:49.465  INFO 86473 --- [nio-8080-exec-1] c.c.c.c.ChargingPointController          : Report:
CP1 OCCUPIED 20A
CP2 AVAILABLE
CP3 AVAILABLE
CP4 AVAILABLE
CP5 AVAILABLE
CP6 AVAILABLE
CP7 AVAILABLE
CP8 AVAILABLE
CP9 AVAILABLE
CP10 AVAILABLE

APIs

POST /v1/cps/{id}

It is called when you plug a car to a CP.

DELETE /v1/cps/{id}

It is called when you unplug a car from a CP.

GET /v1/cps/report

It shows the overall report of all CPs.

API use-case

$ curl -XPOST "http://localhost:8080/v1/cps/CP1"
{"result":"OK","type":"Fast"}
$ curl -XPOST "http://localhost:8080/v1/cps/CP2"
{"result":"OK","type":"Fast"}
$ curl -XDELETE "http://localhost:8080/v1/cps/CP1"
{"result":"OK"}

This is a text formatted test case. When the final command is entered, CP1 will be switched into fast charging mode.

curl -XPOST "http://localhost:8080/v1/cps/CP1"
curl -XPOST "http://localhost:8080/v1/cps/CP2"
curl -XPOST "http://localhost:8080/v1/cps/CP3"
curl -XPOST "http://localhost:8080/v1/cps/CP4"
curl -XPOST "http://localhost:8080/v1/cps/CP5"
curl -XPOST "http://localhost:8080/v1/cps/CP6"
curl -XPOST "http://localhost:8080/v1/cps/CP7"
curl -XPOST "http://localhost:8080/v1/cps/CP8"
curl -XPOST "http://localhost:8080/v1/cps/CP9"
curl -XPOST "http://localhost:8080/v1/cps/CP10"
curl -XDELETE "http://localhost:8080/v1/cps/CP7"

How to run the Unit/Integration Tests

$ ./gradlew test

A test report will be generated on ./build/reports/tests/test