==== Spring Cloud Stream Function Composition Sample In this *Spring Cloud Stream* sample, we will demo function composition with Kafka. ## Requirements To run this sample, you will need to have installed: * Java 8 or Above ## Running the application The following instructions assume that you are running Kafka as a Docker image. * Go to the application root * `docker-compose up -d` * `./mvnw clean package` * `java -jar target/function-composition-kafka-0.0.1-SNAPSHOT.jar` Take a look at the configuration in the application.yml file. The function definition is `uppercase|echo` and the incoming destination is defined as `uppercase-in` (through `uppercase|echo-in-0.destination`) Now, send some text data to the input topic, `docker exec -it kafka /opt/kafka/bin/kafka-console-producer.sh --broker-list 127.0.0.1:9092 --topic uppercase-in` and then watch the application console. You should see output messages from both `uppercase` and `echo` functions. * `docker-compose down`