## Purpose

In modern system architecture, distributed applications are decoupled into smaller, independent modules
that are easier to develop, deploy and maintain.

Message Queue provide an effective way for these distributed applications to communicate and cordinate with each others.
It also improve the quality of a system in term of
* performance
* availability
* scalability

Therefore understanding and working with Message Queue is an important knowledge when dealing with integrated system.

## Description

Use java to build
* kafka producer app that push message to kafka
    * queue name: "tasks"
    * message schema : {"id": "123", "status": "QUEUE", "start_time": "2019-05-01", "end_time": "2019-05-05", "properties": {"pro1": "value"}}
* kafka consumer app that receive message from kafka
    * queue name: "tasks"
    * receive "task" message and print to console

There will be no time constrain.
The sooner you finish the exercise the more time we will have to discuss
* what have you learned
* how you can improve your code
* plan for the next exercise

## Note

If you don't know about messaging yet, below could be some good materials to get started.
* ebook: RabbitMQ in action
* hello world: https://www.rabbitmq.com/tutorials/tutorial-one-java.html

RabbitMQ is a good start to learn about messaging as it is easier than kafka for beginners but note that our exercise is building kafka applications.
hint: The kafka applications you are building is similar to hello world example of RabbitMQ

## What you will learn
* know the basic of how message queue work
* can write a producer & consumer app
* know how to handle message with json format