spring-cloud-stream-samples/multibinder-samples/multibinder-kafka-streams

== Spring Cloud Stream Multibinder Application with Different Systems

This example shows how to run a Spring Cloud Stream application with the same binder type configured for two separate Kafka clusters.


## 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`

This brings up two Kafka clusters in docker containers.
Local ports mapped for kafka are 9092 and 9093 (Zookeeper local parts mapped are 2181 and 2182).

* `./mvnw clean package`

The sample comes with a convenient test producer and consumer to see the processor in action.
After running the program, watch your console, every second some data is sent to Kafka cluster 1 and it is received through Kafka cluster 2.

To run the example, command line parameters for the Zookeeper ensembles and Kafka clusters must be provided, as in the following example:
```
java -jar target/multibinder-kafka-streams-0.0.1-SNAPSHOT.jar --kafkaBroker1=localhost:9092 --zk1=localhost:2181 --kafkaBroker2=localhost:9093 --zk2=localhost:2182```

Alternatively, the default values of `localhost:9092` and `localhost:2181` can be provided for both clusters.

Assuming you are running two dockerized Kafka clusters as above.

Issue the following commands:

`docker exec -it kafka-multibinder-1 /opt/kafka/bin/kafka-console-producer.sh --broker-list 127.0.0.1:9092 --topic dataIn`

On another terminal:

`docker exec -it kafka-multibinder-2 /opt/kafka/bin/kafka-console-consumer.sh --bootstrap-server 127.0.0.1:9093 --topic dataOut`

Enter some text on the first one and the same text appears on the second one.

## Running the Kafka Streams processor:

Run the stand-alone Producers application a few times to to generate some data.

Then go to the URL: http://localhost:8080/events