Asynchronous microservice communication

Sync is like having a direct conversation, but async is more like leaving a message. Microservices don’t wait for a reply, they just send the information and move on.

In asynchronous communication, the requesting service sends a message to the receiving service without waiting for an immediate response. The response is delivered later, either through a callback or through a separate channel.

Figure 2.6: Asynchronous microservice communication

Here’s a breakdown of the steps:

1. Send a message: The calling microservice sends a message with the information to another microservice.
2. Move on: The calling microservice doesn’t wait for a reply. It continues its own task.
3. Process later: The other microservice receives the message and works on it whenever it’s free.
4. Reply: The other microservice might send a response back later, but that’s not required.

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