ORD and integration dependencies (consumed events)

[RamIndia]

cds import

• Typically, one imports events using cds import <asyncAPI-file> [--as cds].
• This creates a model in srv/external/<someModel>.cds, which contains all the Events, not just those of interest.
• Additionally, an entry is created in cds.requires.<externalSrv> that references this model.

Example:
Business Partner Events from S/4HANA: https://api.sap.com/event/CE_BUSINESSPARTNEREVENTS/overview

cds import ~/Downloads/CE_BUSINESSPARTNEREVENTS.json --as cds

Will create

├── srv
│   ├── external
│   │   ├── CE_BUSINESSPARTNEREVENTS.cds
│   │   └── CE_BUSINESSPARTNEREVENTS.json

and

  "cds": {
    "requires": {
      "sap.s4.beh.businesspartner.v1.BusinessPartner": {
        "kind": "odata",
        "model": "srv/external/CE_BUSINESSPARTNEREVENTS"
      }
    }
  }

Problem: All events are imported, not just the ones you're interested in.

Solution

Create an own external service where you only include the events you're interested in.
Reference this model in your external service. For the example above:

using { sap.s4.beh.businesspartner.v1.BusinessPartner.Created.v1 as Created } from './CE_BUSINESSPARTNEREVENTS';
service OwnExtSrv {
  event BPCreated : projection on Created;
}

  "cds": {
    "requires": {
      "sap.s4.beh.businesspartner.v1.BusinessPartner": {
        "kind": "odata",
        "model": "srv/external/OwnExtSrv"
      }
    }
  }

By checking the service definition of all external services (i.e. remote services in cds.requires), ORD can statically scan for all consumed events.