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Scoring Service

Intro

  • Application is initialized by pulling 5 userids who signed up right after the username entered in resources/config.edn
  • There is an event stream producer which puts events on a sliding buffered channel.
  • There is an event stream consumer which
    1. Takes events from the channel
    2. Converts it to a score
    3. Keeps adding it to that user's score in an atom to mimick a database.
  • Rest endpoints are exposed using http-kit/ring/compojure.
  • Application runs on port 9090, and can be altered from the configuration file in resources/config.edn.
  • The unit tests can be run using lein test

Usage

  • Open a REPL using lein repl once you have entered the project root directory from command line
  • Call the (start-app) function at the REPL. (REPL will default to rentpath.core namespace)
  • This will start all the pieces of the application.
  • Calling (stop-app) function will stop the event producer and http-kit.
  • Query it with no parameters to get scores for all the users
$ curl "http://localhost:9090/scores"
[{"id":5148649,"login":"1nk0gn1t0","score":170},{"id":5148647,"login":"tillmannw","score":155},{"id":5148648,"login":"marccharlton","score":176},{"id":5148651,"login":"deadjerk","score":154},{"id":5148650,"login":"ReggaePP","score":182}]
  • Or query it with a user id to get the score of that specific user. The possible user ids are - 5148647, 5148648, 5148649, 5148650, 5148651
$ curl "http://localhost:9090/scores/5148650"
{"id":5148650,"login":"ReggaePP","score":151}
  • Querying with an unknown user id will return an error message.
$ curl "http://localhost:9090/scores/1111"
{"error":"User ID not found"}

Package the application

  1. To package the application, run lein uberjar which will build the a production ready jar file under target directory of the project.
  2. To run the packaged jar file, run java -jar rentpath-1.0-standalone.jar from target/uberjar directory.