gRPC-tests

https://thenewstack.io/build-real-world-microservices-with-grpc/ https://grpc.io/docs/tutorials/basic/java/ https://grpc.io/docs/quickstart/java/ https://www.baeldung.com/grpc-introduction https://codelabs.developers.google.com/codelabs/cloud-grpc-java/index.html?index=..%2F..index#0 https://codenotfound.com/grpc-java-example.html https://scotch.io/tutorials/implementing-remote-procedure-calls-with-grpc-and-protocol-buffers https://developers.google.com/protocol-buffers/docs/javatutorial https://stackoverflow.com/a/45970197 https://www.confluent.io/blog/building-shared-state-microservices-for-distributed-systems-using-kafka-streams/ https://stackoverflow.com/a/56909174 https://www.google.com/amp/s/simplydistributed.wordpress.com/2017/03/21/kafka-streams-state-stores/amp/