messaging

packages/bookshop/db/data/sap.capire.bookshop-Orders.csv

@@ -1,3 +1,3 @@
 ID;modifiedAt;createdAt;createdBy;modifiedBy;OrderNo;currency_code
-7e2f2640-6866-4dcf-8f4d-3027aa831cad;;2019-01-31;john.doe@test.com;;1;EUR
-64e718c9-ff99-47f1-8ca3-950c850777d4;;2019-01-30;jane.doe@test.com;;2;EUR
+7e2f2640-6866-4dcf-8f4d-3027aa831cad;;2019-01-31;ALICE;;1;EUR
+64e718c9-ff99-47f1-8ca3-950c850777d4;;2019-01-30;BOB;;2;EUR

packages/bookshop/package.json

@@ -18,9 +18,12 @@
       "API_BUSINESS_PARTNER": {
         "kind": "odata",
         "model": "srv/external/API_BUSINESS_PARTNER",
-        "credentials": {
+        "--credentials": {
           "destination": "cap-api098"
         }
+      },
+      "messaging": {
+        "kind": "file-based-messaging"
       }
     }
   }

packages/bookshop/req.http

@@ -0,0 +1,6 @@
+PATCH http://localhost:4004/api-business-partner/A_BusinessPartnerAddress(AddressID='19292',BusinessPartner='ALICE')
+Content-Type: application/json
+
+{
+    "StreetName": "ChangedStreet"
+}

packages/bookshop/srv/cat-service.js

@@ -1,12 +1,18 @@
 const cds = require('@sap/cds')
-const { Books } = cds.entities
 
 /** Service implementation for CatalogService */
 module.exports = cds.service.impl(async function () {
+  const { Books, Addresses, Orders } = this.entities
   const bupaSrv = await cds.connect.to('API_BUSINESS_PARTNER')
-  this.after('READ', 'Books', each => each.stock > 111 && _addDiscount2(each, 11))
-  this.before('CREATE', 'Orders', _reduceStock)
-  this.on('READ', 'Addresses', req => bupaSrv.tx(req).run(req.query))
+  this.after('READ', Books, each => each.stock > 111 && _addDiscount2(each, 11))
+  this.before('CREATE', Orders, _reduceStock)
+  this.on('READ', Addresses, req => bupaSrv.tx(req).run(req.query))
+  this.on('BusinessPartner/Changed', async msg => {
+    console.log('>> Received message', msg.data)
+    const BUSINESSPARTNER = msg.data.KEY[0].BUSINESSPARTNER
+    const orders = await cds.tx(msg).run(SELECT.from(Orders).where({ createdBy: BUSINESSPARTNER }))
+    console.log(orders)
+  })
 })
 
 /** Add some discount for overstocked books */

packages/bookshop/srv/external/API_BUSINESS_PARTNER.js

@@ -0,0 +1,9 @@
+module.exports = srv => {
+    srv.on(['CREATE', 'UPDATE', 'DELETE'], req => {
+        const payload = {
+            KEY: [{ BUSINESSPARTNER: req.data.BusinessPartner }]
+        }
+        console.log('<< Emitting message', payload)
+        srv.emit('BusinessPartner/Changed', payload)
+    })
+}