Test for Welt

This solution uses SpringBoot 1.4.3, Java 8, Guava 21.0, Logback and Maven. It's very simple to package or run.

It uses maven 3 so you can:

• run using command-line mvn spring-boot:run
• create a fat jar using mvn clean package
• to run the package you will use java -jar welt_test.jar

This app exposes two endpoints, it's possible to perform the following calls:

• The first endpoint is a GET endpoint: http://localhost:8080/api/generic-merger/**_{userId}_**. This request will perform three (hardcoded) different requests and return a single merged json response.

  • http://jsonplaceholder.typicode.com/users/**{userId}**

  • http://jsonplaceholder.typicode.com/posts?userId=**{userId}**

  • http://jsonplaceholder.typicode.com/posts/**{userId}**/comments

    • e.g.: GET http://localhost:8080/api/generic-merger/3

• The second (POST) endpoint receives a list of urls as json body and produces a merged json with all responses of each received url.

  • e.g.: POST http://localhost:8080/api/generic-merger/
  • ["http://jsonplaceholder.typicode.com/users/1", "http://jsonplaceholder.typicode.com/users/5"]

Note: If a request do not produce a valid json as a response, the app response will not produce a valid json as well.

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INSTRUCTIONS:

Your task is to write a short example app: An Asynchronous API Gateway that proxies two different REST end points and outputs the results into a merged (also JSON) response.

• For example you could use these two endpoints:
  • http://jsonplaceholder.typicode.com/users/1 to obtain a user's data
  • http://jsonplaceholder.typicode.com/posts?userId=1 to obtain all comments written by that user