Java 8 Exercise - Rest API - Stand-up a small microservice

Microservice specification: A simple message subscription service that exposes the following functionality:

• Create a subscription (Would have at least one parameter, which would be a list of messageTypes the subscription wants to keep track of)
• Read the subscription
• Update the subscription
• Post a message

The message would have at least a ‘messageType’ property. In the response to the 'read subscription’ we would like also see how many times a particular event type has been received by a subscription. There may be more than one subscription listening for the same event type(s).

Runnable service written in a Java 8 technology based on spring-boot.

Set up

• Spring Boot: Spring-Boot
• Maven
• Java 8
• Git

Exercise

• Runnable JAR file can be built by Maven, starting up app in Tomcat server
• Rest Interfaces:
  • /subscriptions/info
    • RequestMethod.GET
    • Info page to get sanity check of app
  • /subscriptions/create
    • RequestMethod.POST
    • Parameters:
      • id: Id of a subscription to create
      • messageType: Types of message to be managed by this subscription
    • Description: Create a new subscription
  • /subscriptions/update
    • RequestMethod.PUT
    • Parameters:
      • id: Id of a subscription known by the system
      • messageType: Types of message to be managed by this subscription
    • Description: Update type of messages to be managed by a subscription
  • /subscriptions/read
    • RequestMethod.GET
    • Parameters:
      • id: Id of a subscription to create
    • Description: Report all information available about a subscription according to the exercise. Example of response: {"numberOfMessagesByType":{"typeC":0,"typeB":0,"typeA":12}}
  • /messages/send
    • RequestMethod.POST
    • Body must contain JSON as:
      • {"messageType": "typeA","content": "Any content"}
    • Description: Sends a new message to the system of type = "typeA". After that if a subscription is read then the information will be properly updated If sends is successful then returns: "Message received"
  • /subscriptions/delete
    • RequestMethod.DELETE
    • Parameters
      • id: Id of a subscription to create
    • Description: Remove a subscription if exists in the system

Application was tested with JUnits and MockMVC Rest API was tested with exploratory techniques using POSTMAN as tool

Current coverage summary:

• Class: 100% (6/6)
• Method: 84.4% (27/32)
• Line: 87.6% (113/129)