CQRS with Event Sourcing using Spring Cloud Stream simplistic implementation

Introduction

CQRS stands for Command Query Responsibility segregation, which means that you can use a different model to update information and a different model to read information. Typically by different model we mean actual object model and propably on different machine.

In this example I am using 
* Kafka as event store (for event sourcing)
* MongoDB as Write store
* Could use Elasticsearch as Read store
* Spring Cloud Stream to abstract the event store and the publish/subscribe mechanism

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