no replica context

.vscode/settings.json

@@ -1,8 +1,6 @@
 {
   "files.exclude": {
-    ".reuse/**": true,
     "**/.gitignore": true,
-    "**/.vscode": true,
+    "**/.vscode": true
-    "LICENSES/**": true
   }
 }

LICENSE

@@ -0,0 +1,208 @@
+Apache License
+
+Version 2.0, January 2004
+
+http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION,
+AND DISTRIBUTION
+
+   1. Definitions.
+
+      
+
+"License" shall mean the terms and conditions for use, reproduction, and distribution
+as defined by Sections 1 through 9 of this document.
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+by contract or otherwise, or (ii) ownership of fifty percent (50%) or more
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+code, generated documentation, and conversions to other media types.
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+"Work" shall mean the work of authorship, whether in Source or Object form,
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+is included in or attached to the work (an example is provided in the Appendix
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+that is based on (or derived from) the Work and for which the editorial revisions,
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+"Contribution" shall mean any work of authorship, including the original version
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+2. Grant of Copyright License. Subject to the terms and conditions of this
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+5. Submission of Contributions. Unless You explicitly state otherwise, any
+Contribution intentionally submitted for inclusion in the Work by You to the
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+any additional terms or conditions. Notwithstanding the above, nothing herein
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+may have executed with Licensor regarding such Contributions.
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+6. Trademarks. This License does not grant permission to use the trade names,
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+and hold each Contributor harmless for any liability incurred by, or claims
+asserted against, such Contributor by reason of your accepting any such warranty
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+To apply the Apache License to your work, attach the following boilerplate
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LICENSES/Apache-2.0.txt

@@ -1,201 +0,0 @@
-                                  Apache License
-                           Version 2.0, January 2004
-                        http://www.apache.org/licenses/
-
-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
-   1. Definitions.
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-      form, that is based on (or derived from) the Work and for which the
-      editorial revisions, annotations, elaborations, or other modifications
-      represent, as a whole, an original work of authorship. For the purposes
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-      and issue tracking systems that are managed by, or on behalf of, the
-      Licensor for the purpose of discussing and improving the Work, but
-      excluding communication that is conspicuously marked or otherwise
-      designated in writing by the copyright owner as "Not a Contribution."
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-      on behalf of whom a Contribution has been received by Licensor and
-      subsequently incorporated within the Work.
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-      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
-      copyright license to reproduce, prepare Derivative Works of,
-      publicly display, publicly perform, sublicense, and distribute the
-      Work and such Derivative Works in Source or Object form.
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-      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
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-      use, offer to sell, sell, import, and otherwise transfer the Work,
-      where such license applies only to those patent claims licensable
-      by such Contributor that are necessarily infringed by their
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-      with the Work to which such Contribution(s) was submitted. If You
-      institute patent litigation against any entity (including a
-      cross-claim or counterclaim in a lawsuit) alleging that the Work
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-      or contributory patent infringement, then any patent licenses
-      granted to You under this License for that Work shall terminate
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-      Work or Derivative Works thereof in any medium, with or without
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-      the terms of any separate license agreement you may have executed
-      with Licensor regarding such Contributions.
-
-   6. Trademarks. This License does not grant permission to use the trade
-      names, trademarks, service marks, or product names of the Licensor,
-      except as required for reasonable and customary use in describing the
-      origin of the Work and reproducing the content of the NOTICE file.
-
-   7. Disclaimer of Warranty. Unless required by applicable law or
-      agreed to in writing, Licensor provides the Work (and each
-      Contributor provides its Contributions) on an "AS IS" BASIS,
-      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-      implied, including, without limitation, any warranties or conditions
-      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
-      PARTICULAR PURPOSE. You are solely responsible for determining the
-      appropriateness of using or redistributing the Work and assume any
-      risks associated with Your exercise of permissions under this License.
-
-   8. Limitation of Liability. In no event and under no legal theory,
-      whether in tort (including negligence), contract, or otherwise,
-      unless required by applicable law (such as deliberate and grossly
-      negligent acts) or agreed to in writing, shall any Contributor be
-      liable to You for damages, including any direct, indirect, special,
-      incidental, or consequential damages of any character arising as a
-      result of this License or out of the use or inability to use the
-      Work (including but not limited to damages for loss of goodwill,
-      work stoppage, computer failure or malfunction, or any and all
-      other commercial damages or losses), even if such Contributor
-      has been advised of the possibility of such damages.
-
-   9. Accepting Warranty or Additional Liability. While redistributing
-      the Work or Derivative Works thereof, You may choose to offer,
-      and charge a fee for, acceptance of support, warranty, indemnity,
-      or other liability obligations and/or rights consistent with this
-      License. However, in accepting such obligations, You may act only
-      on Your own behalf and on Your sole responsibility, not on behalf
-      of any other Contributor, and only if You agree to indemnify,
-      defend, and hold each Contributor harmless for any liability
-      incurred by, or claims asserted against, such Contributor by reason
-      of your accepting any such warranty or additional liability.
-
-   END OF TERMS AND CONDITIONS
-
-   APPENDIX: How to apply the Apache License to your work.
-
-      To apply the Apache License to your work, attach the following
-      boilerplate notice, with the fields enclosed by brackets "[]"
-      replaced with your own identifying information. (Don't include
-      the brackets!)  The text should be enclosed in the appropriate
-      comment syntax for the file format. We also recommend that a
-      file or class name and description of purpose be included on the
-      same "printed page" as the copyright notice for easier
-      identification within third-party archives.
-
-   Copyright [yyyy] [name of copyright owner]
-
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-   you may not use this file except in compliance with the License.
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-
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-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.

README.md

@@ -3,7 +3,8 @@
 Find here a collection of samples for the [SAP Cloud Application Programming Model](https://cap.cloud.sap) organized in a simplistic [monorepo setup](samples.md#all-in-one-monorepo). → See [**Overview** of contained samples](samples.md)
 
 ![](https://github.com/SAP-samples/cloud-cap-samples/workflows/CI/badge.svg)
-[![REUSE status](https://api.reuse.software/badge/github.com/SAP-samples/cloud-cap-samples)](https://api.reuse.software/info/github.com/SAP-samples/cloud-cap-samples)
+<!--[![REUSE status](https://api.reuse.software/badge/github.com/SAP-samples/cloud-cap-samples)](https://api.reuse.software/info/github.com/SAP-samples/cloud-cap-samples)-->
+
 
 ### Preliminaries
 

bookshop/package.json

@@ -4,7 +4,7 @@
   "description": "A simple self-contained bookshop service.",
   "dependencies": {
     "@capire/common": "*",
-    "@sap/cds": ">=4",
+    "@sap/cds": "^4",
     "express": "^4.17.1",
     "passport": "0.4.1"
   },
@@ -16,8 +16,7 @@
   "cds": {
     "requires": {
       "db": {
-        "kind": "sqlite",
+        "kind": "sql"
-        "model": "*"
       }
     }
   }

bookshop/srv/server.js

@@ -1,19 +0,0 @@
-const cds = require ('@sap/cds')
-
-cds.on('listening', async ()=>{ try { //> just to see the output at the end; will later on be in db service impl
-  console.log ('\nFilling database with initial data...')
-  const m = cds.model.minified() //> we likely should do that by default
-  const tx = cds.tx()
-  tx.run ([ //> this will be replaced by
-    DELETE.from ('sap.capire.bookshop.Authors'),
-    DELETE.from ('sap.capire.bookshop.Books'),
-    DELETE.from ('sap.capire.bookshop.Books.texts'),
-    DELETE.from ('sap.capire.bookshop.Genres'),
-    DELETE.from ('sap.common.Currencies'),
-    DELETE.from ('sap.common.Currencies.texts'),
-  ])
-  await cds.deploy(m).to(tx,{ddl:false})
-  await tx.commit()
-} catch(e) { console.error(e) }})
-
-module.exports = cds.server

fiori/app/admin/fiori-service.cds

@@ -1,4 +1,4 @@
-using { AdminService } from '../../db/schema';
+using { AdminService } from '../../db';
 
 ////////////////////////////////////////////////////////////////////////////
 //

fiori/db/hana/index.cds

@@ -2,7 +2,7 @@
 //  Add Author.age and .lifetime with a DB-specific function
 //
 
-using { AdminService } from '../schema';
+using { AdminService } from '..';
 
 extend projection AdminService.Authors with {
   YEARS_BETWEEN(dateOfBirth, dateOfDeath)         as age: Integer,

fiori/db/sqlite/index.cds

@@ -2,7 +2,7 @@
 //  Add Author.age and .lifetime with a DB-specific function
 //
 
-using { AdminService } from '../schema';
+using { AdminService } from '..';
 
 extend projection AdminService.Authors with {
   strftime('%Y',dateOfDeath)-strftime('%Y',dateOfBirth)              as age: Integer,

fiori/package.json

@@ -3,10 +3,11 @@
   "version": "1.0.0",
   "dependencies": {
     "@capire/bookshop": "*",
-    "@capire/reviews": "*",
-    "@capire/orders": "*",
     "@capire/common": "*",
-    "@sap/cds": ">=4",
+    "@capire/orders": "*",
+    "@capire/reviews": "*",
+    "@capire/suppliers": "*",
+    "@sap/cds": "^4",
     "express": "^4.17.1",
     "passport": "^0.4.1"
   },
@@ -19,6 +20,10 @@
       "deploy-format": "hdbtable"
     },
     "requires": {
+      "API_BUSINESS_PARTNER": {
+        "kind": "odata",
+        "model": "@capire/suppliers"
+      },
       "auth": {
         "strategy": "dummy"
       },

fiori/server.js

@@ -7,6 +7,7 @@ cds.once('bootstrap',(app)=>{
 })
 
 cds.once('served', require('./srv/mashup'))
+cds.once('served', require('@capire/suppliers/srv/mashup'))
 
 module.exports = cds.server
 

orders/package.json

@@ -2,6 +2,6 @@
   "name": "@capire/orders",
   "version": "1.0.0",
   "dependencies": {
-    "@sap/cds": ">=4.3.0"
+    "@sap/cds": "^4.3.0"
   }
 }

package.json

@@ -11,15 +11,17 @@
     "@capire/hello": "./hello",
     "@capire/media": "./media",
     "@capire/orders": "./orders",
-    "@capire/reviews": "./reviews"
+    "@capire/reviews": "./reviews",
+    "@capire/suppliers": "./suppliers"
   },
   "devDependencies": {
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "chai-subset": "^1.6.0",
-    "sqlite3": "^5.0.0"
+    "sqlite3": "5.0.0"
   },
   "scripts": {
+    "fix-antlr": "sed -i -e 's/INVALID_ALT_NUMBER = require.*/INVALID_ALT_NUMBER = 0/' node_modules/antlr4/tree/Trees.js node_modules/antlr4/RuleContext.js",
     "registry": "node .registry/server.js",
     "bookshop": "cds watch bookshop",
     "fiori": "cds watch fiori",

reviews/package.json

@@ -7,7 +7,7 @@
     "index.cds"
   ],
   "dependencies": {
-    "@sap/cds": ">=4",
+    "@sap/cds": "^4",
     "express": "^4.17.1"
   },
   "scripts": {

reviews/srv/reviews-service.cds

@@ -8,16 +8,16 @@ service ReviewsService {
   action unlike (review: type of Reviews:ID);
 
   // Async API
-   event reviewed : {
+   event reviewed : projection on Reviews {
-     subject: type of Reviews:subject;
+     subject,
-     rating: Decimal(2,1)
+     rating
    }
 
   // Input validation
   annotate Reviews with {
     subject  @mandatory;
     title    @mandatory;
-    rating   @assert.range;
+    rating   @assert.enum;
   }
 
 }

samples.md

@@ -49,14 +49,22 @@ Each sub directory essentially is an individual npm package arranged in an [all-
 - Late-cut Micro Services
 - As well as managed data, input validations, and authorization
 
+## [@capire/suppliers](suppliers)
+
+- Shows how to integrate remote services, in this case the BusinessPartner service from SAP S/4HANA.
+- Extending [@capire/bookshop](bookshop) with suppliers from SAP S/4HANA
+- Providing that as a pre-built integration & extension package
+- Used in [@capire/fiori](fiori)
+
 
 ## [@capire/fiori](fiori)
 
 - A [composite app, reusing and combining](https://cap.cloud.sap/docs/guides/verticalize) these packages:
   - [@capire/bookshop](bookshop)
-  - [@capire/reviews](reviews)
-  - [@capire/orders](orders)
   - [@capire/common](common)
+  - [@capire/orders](orders)
+  - [@capire/reviews](reviews)
+  - [@capire/suppliers](suppliers)
 - [Adds an SAP Fiori elements application](https://cap.cloud.sap/docs/guides/fiori/) to bookshop, thereby introducing to:
   - [OData Annotations](https://cap.cloud.sap/docs/guides/fiori#adding-odata-annotations) in `.cds` files
   - Support for [Fiori Draft](https://cap.cloud.sap/docs/guides/fiori#draft)

suppliers/index.cds

@@ -0,0 +1 @@
+using from './srv/mashup';

suppliers/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "@capire/suppliers",
+  "version": "1.0.0",
+  "description": "Shows integration with SAP S/4HANA, in turn provided as a reusable extension package to bookshop.",
+  "private": true,
+  "dependencies": {
+    "@capire/common": "*",
+    "@sap/cds": "^4",
+    "express": "^4"
+  },
+  "scripts": {
+    "start": "cds run --in-memory?",
+    "watch": "cds watch",
+    "mocked-s4": "cds mock API_BUSINESS_PARTNER"
+  },
+  "cds": {
+    "requires": {
+      "API_BUSINESS_PARTNER": {
+        "kind": "odata",
+        "model": "srv/external/API_BUSINESS_PARTNER"
+      }
+    }
+  }
+}

suppliers/server.js

@@ -0,0 +1,3 @@
+const cds = require ('@sap/cds')
+cds.once('served', require('./srv/mashup'))
+module.exports = cds.server

suppliers/srv/external/data/API_BUSINESS_PARTNER-A_BusinessPartner.csv

@@ -0,0 +1,7 @@
+BusinessPartner;BusinessPartnerFullName
+ACME;A Company Making Everything
+B4U;Books for You
+S&C;Shakespeare & Co.
+WSL;Waterstones
+TLD;Thalia
+PNG;Penguin Books

suppliers/srv/external/data/API_BUSINESS_PARTNER-Suppliers.csv

@@ -0,0 +1,5 @@
+ID;name
+ACME;A Company Making Everything
+B4U;Books for You
+S&C;Shakespeare & Co.
+WSL;Waterstones

suppliers/srv/mashup.cds

@@ -0,0 +1,25 @@
+/*
+  Optionally add projections to external entities, to capture what
+  you actually want to use from there.
+ */
+
+using {API_BUSINESS_PARTNER as S4} from './external/API_BUSINESS_PARTNER.csn';
+
+@cds.autoexpose // or expose explicitly in Catalog and AdminService
+@cds.persistence: {table,skip:false}
+entity sap.capire.bookshop.Suppliers as projection on S4.A_BusinessPartner {
+  key BusinessPartner as ID, BusinessPartnerFullName as name
+}
+
+using { sap.capire.bookshop.Books, CatalogService } from '@capire/bookshop';
+extend Books with {
+  supplier: Association to sap.capire.bookshop.Suppliers;
+}
+
+extend service AdminService with { // why is AdminService visible?
+  entity Suppliers as projection on sap.capire.bookshop.Suppliers;
+}
+
+extend projection CatalogService.ListOfBooks with {
+  supplier
+}

suppliers/srv/mashup.js

@@ -0,0 +1,57 @@
+////////////////////////////////////////////////////////////////////////////
+//
+//    Mashing up provided and required services...
+//
+module.exports = async()=>{ // called by server.js
+
+  if (!cds.services.AdminService) return //> mocking S4 service only
+
+  // Connect to services we want to mashup below...
+  const S4bupa = await cds.connect.to('API_BUSINESS_PARTNER')   //> external S4 service
+  const admin = await cds.connect.to('AdminService')            //> local domain service
+  const db = await cds.connect.to('db')                         //> our primary database
+
+  // Reflect CDS definition of the Suppliers entity
+  const { Suppliers } = S4bupa.entities
+
+  admin.prepend (()=>{ //> to ensure our .on handlers below go before the default ones
+
+    // Delegate Value Help reads for Suppliers to S4 backend
+    admin.on ('READ', 'Suppliers', req => {
+      console.log ('>> delegating to S4 service...')
+      return S4bupa.run(req.query)
+    })
+
+    // Replicate Supplier data when edited Books have suppliers
+    admin.on (['CREATE','UPDATE'], 'Books', ({data:{supplier}}, next) => {
+      // Using Promise.all(...) to parallelize local write, i.e. next(), and replication
+      if (supplier) return Promise.all ([ next(), async()=>{
+        let replicated = await db.exists (Suppliers, supplier)
+        if (!replicated) await replicate (supplier, 'initial')
+      }])
+      else return next() //> don't forget to pass down the interceptor stack
+    })
+
+  })
+
+  // Subscribe to changes in the S4 origin of Suppliers data
+  S4bupa.on ('BusinessPartners/Changed', async msg => { //> would be great if we had batch events from S/4
+    let replicas = await SELECT('ID').from (Suppliers) .where ('ID in', msg.businessPartners)
+    return replicate (replicas.map(each => each.ID))
+  })
+
+  /**
+   * Helper function to replicate Suppliers data.
+   * @param {string|string[]} IDs a single ID or an array of IDs
+   * @param {truthy|falsy} _initial indicates whether an insert or an update is required
+   */
+  async function replicate (IDs,_initial) {
+    if (!Array.isArray(IDs)) IDs = [ IDs ]
+    let suppliers = await S4bupa.read (Suppliers).where('ID in',IDs)
+    if (_initial) return db.insert (suppliers) .into (Suppliers) //> using bulk insert
+    else return Promise.all(suppliers.map ( //> parallelizing updates
+      each => db.update (Suppliers,each.ID) .with (each)
+    ))
+  }
+
+}