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kafka-testing-demo application

Environment

To launch application on your PC you need to do following steps:

  • clone Docker images from GitHub repository
git clone [email protected]:confluentinc/cp-all-in-one.git
  • Navigate to the cp-all-in-one-cloud directory.
cd cp-all-in-one-cloud
  • Checkout the 6.0.0-post branch.
git checkout 6.0.0-post
  • To bring up all services locally, at once (make sure your Docker Desktop is running):
docker-compose up -d
  • Optional: Run this command to verify that the services are up and running.
docker-compose ps

You should see the following:

     Name                    Command               State                Ports
------------------------------------------------------------------------------------------
broker            /etc/confluent/docker/run        Up      0.0.0.0:29092->29092/tcp,
                                                           0.0.0.0:9092->9092/tcp
connect           /etc/confluent/docker/run        Up      0.0.0.0:8083->8083/tcp,
                                                           9092/tcp
control-center    /etc/confluent/docker/run        Up      0.0.0.0:9021->9021/tcp
ksqldb-cli        ksql http://localhost:8088       Up
ksqldb-datagen    bash -c echo Waiting for K ...   Up
ksqldb-server     /etc/confluent/docker/run        Up      0.0.0.0:8088->8088/tcp
rest-proxy        /etc/confluent/docker/run        Up      0.0.0.0:8082->8082/tcp
schema-registry   /etc/confluent/docker/run        Up      0.0.0.0:8081->8081/tcp
zookeeper         /etc/confluent/docker/run        Up      0.0.0.0:2181->2181/tcp,
                                                           2888/tcp, 3888/tcp

If the state is not Up, rerun the docker-compose up -d command.

  • Once all services are up wait 1-2 minutes and launch http://localhost:9021/ in your browser. If all services are up and everything works properly, you'll see following: Confluent UI

  • Select Topics from the cluster submenu and click Add a topic. Topic

  • Create a topic named sum and click Create with defaults. Topic sum

  • Go to schema => Set a schema Schema

  • Delete default schema and insert schema located in multiplier/src/main/resources/avro/number.avsc Sum schema

  • Create a topic square following above steps. The schema is located in multiplier/src/main/resources/avro/square.avsc Square schema

Project diagram

Diagram

Application launch

Make sure your Docker Desktop is running and all docker images from cp-all-in-one are up and healthy.

  1. Launch services generator, adder, multiplier using mvn spring-boot:run from command line.

  2. To test whether everything works properly run functional tests: when all the services are running, run the kafka-kalculator-test using mvn test in command line.

  3. Every time we send post request on http://127.0.0.1:8090/generate generator service generates two integers and send them to sum topic. adder service consumes the message from the same topic, sum them and send the sum to the topic. multiplier service consumes message with sum from sum topic, square it and send the result to square topic.