==== 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`
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