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Camel Kafka - Spring Boot example

Abstract

An example which shows how to integrate Camel with Kafka offsetRepository to use in order to locally store the offset of each partition of the topic

Introduction

This project consists of the following examples:

  1. Producer triggers with a timer and produces messages to the configured topic

  2. Consumer consumes from configured topic by reading the offset value from locally stored file.

Trying out the example on your local machine

Start the kafka broker:

docker run -d -e ALLOW_PLAINTEXT_LISTENER=yes -e KAFKA_CFG_ADVERTISED_LISTENERS=PLAINTEXT://localhost:9092 -e KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE=true -p 9092:9092 bitnami/kafka:latest

How to run the example

You can run this example using

mvn spring-boot:run

You can then examine the newly created file offsetStateRepo.dat to see the topic offset:

offset-repo-example/0=0
offset-repo-example/0=1
offset-repo-example/0=2
offset-repo-example/0=3
offset-repo-example/0=4
offset-repo-example/0=5

Trying out the example on OpenShift

First, start with creating a new OpenShift project:

oc new-project csb-example-kafka-offset

Deploy Kafka using OperatorHub:

oc process -f src/main/resources/openshift/kafka-template.yml -p STARTING_CSV=$(oc get packagemanifests strimzi-kafka-operator -o jsonpath='{.status.channels[?(@.name=="stable")].currentCSV}') | oc create -f -

How to run

The application is deployed using the openshift-maven-plugin that takes care of creating all the necessary OpenShift resources.

Simply use the following command to deploy the application:

mvn clean package -Popenshift

and wait until application pod reaches the Ready state. You can then access the offsetStateRepo.dat file for example with:

oc exec dc/camel-example-spring-boot-kafka-offsetrepository -- cat /deployments/offsetStateRepo.dat

Help and contributions

If you hit any problem using Camel or have some feedback, then please let us know.

We also love contributors, so get involved :-)

The Camel riders!