SCS-100

PubSub Mechanism

A simple Example of an Event Driven Flow by the help of SPRING CLOUD STREAM KAFKA

properties

java.version: 11
spring-cloud.version: Hoxton.SR11 (To get Advantage of Binders @Input,@Output)
spring-boot.version: 2.4.5

Documentation

Please visit Spring Cloud Stream Kafka (Part 2) for Project documentation

The Docker-compose file contains: single kafka and zookeeper. just simply run the following command

docker-compose up -d

Note: I assume you already have docker setup in your machine.

Make the project

run the following command line to create you jar file in target directory

mvn clean package

Then run the generated jar file in target folder, (so make sure you are in the same directory when you run the jar file or give the full path)

java -jar scs-100-0.0.1-SNAPSHOT.jar

the application starts to listen on port 8080. make sure that port not being occupied by any other app already, if is try to pass the following parameter before -jar by adding -Dserver.port=8081 as:

java -Dserver.port=8081 -jar scs-100-0.0.1-SNAPSHOT.jar

Note: you can also modify the application.yml and set the same properties based on your app profile

At this point you should have already seen the information about your topics.

Check Application

Create Order or Place your Order

you should now be able to place your order by calling the following curl command

# assuming your app is listening on 8080
ORDER_UUID=$(curl --silent -H 'Content-Type: application/json' -d "{\"itemName\":\"book\"}" http://localhost:8080/order | jq -r '.orderUuid') && for i in `seq 1 15`; do echo $(curl --silent "http://localhost:8080/order/status/"$ORDER_UUID); sleep 1; done;

Note: make sure you have already installed the jq

Please visit Spring Cloud Stream Kafka (Part 2) for Project documentation