Module Integration
Understand how synchronous communication among components operates in our modular monolith application.
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All interactions between the modules are entirely synchronous and communicate via gRPC. With a distributed system such as our modular monolith application, there are two reasons that bounded contexts will need to integrate:
They need data that exists in another bounded context.
They need another bounded context to perform an action.
Using external data
When a bounded context needs data belonging to another bounded context, it has three options:
Share the database where the data is stored.
Push the data from the owner to all interested components.
Pull the data from the owner when it is needed. ...