Implementing Domain-Driven Design

Integration Using RESTful Resources

When a Bounded Context provides a rich set of RESTful resources through URIs, it is a kind of Open Host Service (3):

Define a protocol that gives access to your subsystem as a set of services. Open the protocol so that all who need to integrate with you can use it. Enhance and expand the protocol to handle new integration requirements. [Evans]

We can well think of the HTTP methods—GET, PUT, POST, and DELETE—combined with resources on which they operate, as a set of open services. HTTP and REST certainly form an open protocol allowing all who need to integrate with the subsystem to do so. The fact that a virtually unlimited number of resources—each with a unique identity through a URI—can be created allows ...