Apache Camel-ActiveMQ Integration With SpringBoot

Can Apache Camel be used as a smart endpoint in microservices architecture? I think yes, In this project Apache Camel is used for exposing rest endpoints and directing the requests to relevant Topics or Queues which are subscribed by relevant microservices.

The Goal

The goal of this project is to understand the capabilities of Apache Camel on how it can perform as a smart endpoint. For achieving this smartness a routing mechanism is built under route package where you can find a abstract router class extending RouteBuilder and two different routers extending this abstract class . You can think of these two extending classes as single ,independent microservices.Once the router directs messages to relevant ActiveMQ queues, the service who is subscribed to these topics , get and use the messages.

Another intention of this project is exposing rest endpoints with Camel RestDSL and direct these requests to related queues in ActiveMQ by using RouteBuilder .

For connecting ActiveMQ ,the AMQP protocol is used via Apache Qpid libary. You can find how the properties set to connect to ActiveMQ in config package together with application.properties file.

Prerequisites

Because the incoming requests are being directed to ActiveMQ, you need to have activemq installed on your environment.

Installing

In Pom.xml you can find all required dependencies , once you install the project with maven, just start it as springboot app and your rest endpoints start to serve immediately on embededed tomcat at the port 8080 unless you change it .

The Endpoints to reach after running the project

localhost:8080/user/{name}==> This rest endpoint is for User microservice which is consuming from User topic localhost:8080/login/{name}==> This rest endpoint is for Login microservice which is consuming from Login topic

Running the tests

Under test package you can find the RouterTest class where a TestRestTemplate is injected to reach and test the endpoints

Deployment

Embededed Tomcat is coming out of the box ,so no need for extra effort to package the project as war or jar and deploy it to somewhere unless you have special intentions .