How did the services interact in your last project?

In my last project, services primarily interacted through REST API. Each service provided a set of HTTP endpoints that other services called to retrieve data or perform operations. Message queues (e.g., RabbitMQ) were also used for message exchange, enabling asynchronous interaction and increasing system resilience.

Example of interaction via REST:

// Client service calls another service via HTTP
RestTemplate restTemplate = new RestTemplate();
String response = restTemplate.getForObject("http://userservice/api/users/123", String.class);

Asynchronous interaction via queue:

• Service A publishes a message to the queue
• Service B subscribes to this queue and processes messages as they arrive

This approach allows for responsibility separation between services and simplifies scaling.