[wip] bookshop

package.json

@@ -21,6 +21,7 @@
     "@sap/cds": ">=7"
   },
   "devDependencies": {
+    "@cap-js/sqlite": "^1",
     "@cap-js/event-broker": "file:.",
     "@sap-cloud-sdk/resilience": "^4.0.0",
     "@sap/xssec": "^4.2.4"

test/bookshop/db/data/my.bookshop-Books.csv

@@ -0,0 +1,3 @@
+ID,title,stock
+1,Wuthering Heights,100
+2,Jane Eyre,500

test/bookshop/db/data/my.bookshop-Customers.csv

@@ -0,0 +1,2 @@
+ID,name,BusinessPartner,synchronized
+1,John Doe,JD,true

test/bookshop/db/schema.cds

@@ -0,0 +1,14 @@
+namespace my.bookshop;
+
+entity Books {
+  key ID    : Integer;
+      title : String;
+      stock : Integer;
+}
+
+entity Customers {
+  key ID                     : Integer;
+      name                   : String;
+      BusinessPartner        : String;
+      @readonly synchronized : Boolean;
+}

test/bookshop/package.json

@@ -0,0 +1,37 @@
+{
+  "name": "bookshop",
+  "version": "1.0.0",
+  "description": "A simple CAP project.",
+  "repository": "<Add your repository here>",
+  "license": "UNLICENSED",
+  "private": true,
+  "dependencies": {
+    "@sap/cds": "^8",
+    "express": "^4",
+    "@cap-js/event-broker": "*",
+    "@cap-js/sqlite": "^1"
+  },
+  "scripts": {
+    "start": "cds-serve"
+  },
+  "cds": {
+    "requires": {
+      "auth": "mocked",
+      "db": {
+        "kind": "sqlite",
+        "credentials": {
+          "url": "sqlite.db",
+          "[development]": {
+            "url": ":memory:"
+          }
+        }
+      },
+      "messaging": {
+        "kind": "event-broker",
+        "[development]": {
+          "kind": "local-messaging"
+        }
+      }
+    }
+  }
+}

test/bookshop/server.js

@@ -0,0 +1,5 @@
+const cds = require('@sap/cds')
+
+cds.on('served', async () => {
+  if (cds.env.requires.messaging.kind === 'event-broker') await cds.connect.to('ucl')
+})

test/bookshop/srv/cat-service.cds

@@ -0,0 +1,5 @@
+using my.bookshop as my from '../db/schema';
+
+service CatalogService {
+    @readonly entity Books as projection on my.Books;
+}

test/bookshop/srv/customers-service.cds

@@ -0,0 +1,10 @@
+using my.bookshop as my from '../db/schema';
+
+@requires: 'admin'
+service CustomersService {
+  entity Customers as projection on my.Customers;
+
+  event Customer.Changed @(topic: 'sap.s4.beh.businesspartner.v1.BusinessPartner.Changed.v1') {
+    BusinessPartner : String
+  }
+}

test/bookshop/srv/customers-service.js

@@ -0,0 +1,23 @@
+const cds = require('@sap/cds')
+
+module.exports = class CustomersService extends cds.ApplicationService {
+  async init() {
+    const messaging = await cds.connect.to('messaging')
+
+    messaging.on('Customer.Changed', async function (msg) {
+      const { BusinessPartner } = msg.data
+      await UPDATE('my.bookshop.Customers').set({ synchronized: true }).where({ BusinessPartner })
+    })
+
+    this.before('UPDATE', 'Customers', function (req) {
+      req.data.synchronized = false
+    })
+
+    this.after('UPDATE', 'Customers', async function (data, req) {
+      const { BusinessPartner } = await SELECT.one.from(req.subject)
+      await messaging.emit('Customer.Changed', { BusinessPartner })
+    })
+
+    return super.init()
+  }
+}

test/bookshop/test.http

@@ -0,0 +1,12 @@
+GET http://localhost:4004/odata/v4/customers/Customers(1)
+Authorization: Basic alice:wonderland
+
+###
+
+PATCH http://localhost:4004/odata/v4/customers/Customers(1)
+Authorization: Basic alice:wonderland
+Content-Type: application/json
+
+{
+  "name": "Jane Doe"
+}