Node.JS Coding Challenge

The assignment is to build a simple Producer/Consumer system. In this system the Generator will send a series of random arithmetic expressions, while the Evaluator will accept these expressions, compute the result and then report the solution to the Generator.

Requirements

At a minimum, the following must be implemented:

The Producer and Consumer as separate NodeJS services.
The Producer generating random addition expressions of two positive integers, e.g. "2+3="
The Consumer computing and returning the correct mathematical result for the each expression it receives
The Consumer successfully processing requests from two Producers concurrently at a rate of at least 1 req/sec from each Producer (2 req/sec in aggregate)
The Consumer and Producer should log all messages they generate and receive.
You are free to support more than simple addition, but it is not required.

The end product should:

Be built in strict JavaScript and run with NodeJS
NOT rely on any external services like Redis, ZeroMQ or similar technologies
NOT use Express (Connect is Ok)
Include UML Activity Diagram and UML Sequence Diagram documenting the business logic
Include Unit tests

UML Activity Diagram

UML Sequence Diagram

Building/Installing Project

Clone the project locally

$ git clone https://github.com/brandonmoser/node_challenge.git && cd node_challenge

Then install the npm packages

$ npm install

Running Tests

The tests are built with Mocha & Chai

$ npm test

Running the Generator(s) and Server

Each Generator will require a separate terminal instance. Only 1 server can be run at a time, unless different ports are defined. The Requesting and Serving port can be set by the environment variable $ export PORT=3000.

Running the server

$ npm start

Running the generator

$ npm run generate