Receiving Messages in the Shopping Baskets Module

To receive event messages, the initial composition root changes are very much the same, as outlined here:

• We need to register the storespb events with our registry.

• We need to create an event stream instance.

Adding store integration event handlers

On the receiving side, we will always be using event handlers. The EventHandler instance we need to create is just like the domain and aggregate event handlers we have been working with from the past couple of chapters.

For now, we will log a debug message when we receive an event so that we can verify that we are really communicating with events. On this end, when we get a StoreCreated event, the event defined in the storespb package, it will have been serialized, sent over, and deserialized back into our event. The code is illustrated in the following snippet: