David Kunz: Messaging and Service Consumption

How to use CAP service consumption and messaging in a grow-as-you-go fashion, quickly iterating on extending the well-known CAP bookshop sample. A remote SAP S/4HANA API is imported, first mocked, then actually called, extending the bookshop to reference remote entities, do partial replication of them, and keep them up to date by subscribing and acting on change events sent by the remote system.