Kuidas korraldada mitme teenuse vahelist koostööd?

Messages via broker (Kafka, RabbitMQ), REST API, gRPC.

The choice depends on requirements:

• Message broker: Asynchronous interaction, high scalability, reliability (guaranteed delivery), decoupled architecture. Suitable for event-driven architecture, background tasks, distributed transactions.

  // Example of sending a message in Kafka
  kafkaTemplate.send("topic-name", "message-payload");
  

• REST API: Synchronous interaction, easy to implement, HTTP protocol. Suitable for data retrieval, idempotent operations.

  // Example of calling REST API with RestTemplate
  restTemplate.getForObject("http://service-url/resource", MyResponse.class);
  

• gRPC: Synchronous/streaming interaction, high performance thanks to Protobuf, bidirectional communication. Suitable for high-load systems, large data transfer.

  // Example of calling gRPC service
  MyServiceGrpc.MyServiceBlockingStub stub = MyServiceGrpc.newBlockingStub(channel);
  MyResponse response = stub.myMethod(MyRequest.newBuilder().build());
  

Commonly used approaches include combined methods, e.g., REST for data requests and broker for event processing. Service discovery and load balancing are done using Service Registry (Eureka, Consul) and API Gateway (Spring Cloud Gateway, Zuul).