From 44be86af20d55b506c7dcc5622533dbb1b29f3c3 Mon Sep 17 00:00:00 2001
From: Robin de Silva Jayasinghe <r.de.silva.jayasinghe@sap.com>
Date: Thu, 11 Jan 2024 15:40:53 +0100
Subject: [PATCH 1/3] updated java settings

---
 .vscode/settings.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.vscode/settings.json b/.vscode/settings.json
index 7b016a89..d53ecaf3 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,3 +1,4 @@
 {
-    "java.compile.nullAnalysis.mode": "automatic"
+    "java.compile.nullAnalysis.mode": "automatic",
+    "java.configuration.updateBuildConfiguration": "automatic"
 }
\ No newline at end of file

From 6afe368b9ab735767797f96faea3b420c1e42a0d Mon Sep 17 00:00:00 2001
From: Robin de Silva Jayasinghe <r.de.silva.jayasinghe@sap.com>
Date: Thu, 11 Jan 2024 15:41:30 +0100
Subject: [PATCH 2/3] set trigger file for work with devtools and mvn
 cds:auto-build

---
 srv/src/main/resources/application.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/srv/src/main/resources/application.yml b/srv/src/main/resources/application.yml
index 090f4d17..70aa0e30 100644
--- a/srv/src/main/resources/application.yml
+++ b/srv/src/main/resources/application.yml
@@ -26,6 +26,7 @@ cds:
 spring:
     config.activate.on-profile: default
     web.resources.static-locations: "file:./app"
+    devtools.restart.trigger-file: .reloadtrigger
     
 server:
     port: 4004

From cac1050d4cb52cbd2147b5557b9676e581ec7376 Mon Sep 17 00:00:00 2001
From: Robin de Silva Jayasinghe <r.de.silva.jayasinghe@sap.com>
Date: Thu, 18 Jan 2024 13:29:49 +0100
Subject: [PATCH 3/3] intermediate step

---
 db/master-data.cds                            |  2 +-
 .../TravelBookingUpdatedHandler.java          | 31 +++++++++++++++++++
 srv/travel-service.cds                        | 10 ++++++
 3 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 srv/src/main/java/com/sap/cap/sflight/processor/TravelBookingUpdatedHandler.java

diff --git a/db/master-data.cds b/db/master-data.cds
index 950fada3..7482390e 100644
--- a/db/master-data.cds
+++ b/db/master-data.cds
@@ -30,7 +30,7 @@ entity Supplement : managed, MasterData {
   CurrencyCode     : Currency;
 };
 
-entity Flight : MasterData {
+entity Flight {
   // TODO:
   // when cuid is added, the to_Airline & to_Connection can be made managed association,
   // furthermore the AirlineID and ConnectionID can be removed,
diff --git a/srv/src/main/java/com/sap/cap/sflight/processor/TravelBookingUpdatedHandler.java b/srv/src/main/java/com/sap/cap/sflight/processor/TravelBookingUpdatedHandler.java
new file mode 100644
index 00000000..e5bd5991
--- /dev/null
+++ b/srv/src/main/java/com/sap/cap/sflight/processor/TravelBookingUpdatedHandler.java
@@ -0,0 +1,31 @@
+package com.sap.cap.sflight.processor;
+
+import org.springframework.stereotype.Component;
+
+import com.sap.cds.ql.CQL;
+import com.sap.cds.ql.Select;
+import com.sap.cds.services.cds.CqnService;
+import com.sap.cds.services.handler.EventHandler;
+import com.sap.cds.services.handler.annotations.Before;
+import com.sap.cds.services.handler.annotations.ServiceName;
+
+import cds.gen.travelservice.Booking_;
+import cds.gen.travelservice.Travel;
+import cds.gen.travelservice.TravelService_;
+import cds.gen.travelservice.Travel_;
+
+@Component
+@ServiceName(TravelService_.CDS_NAME)
+public class TravelBookingUpdatedHandler implements EventHandler {
+    
+
+	@Before(event = {CqnService.EVENT_UPDATE, CqnService.EVENT_CREATE}, entity = Travel_.CDS_NAME)
+    public void onTravelUpdate(Travel travel) {
+
+
+        Select<Booking_> allTravels = Select.from(Booking_.class)
+            .columns(c -> CQL.count(c.ConnectionID()).as("seats"))
+            .where(b -> b.to_Travel_TravelUUID().eq(travel.travelUUID()))
+            .groupBy(g -> g.ConnectionID());
+    }
+}
diff --git a/srv/travel-service.cds b/srv/travel-service.cds
index cdb00c57..7ffc1bce 100644
--- a/srv/travel-service.cds
+++ b/srv/travel-service.cds
@@ -1,7 +1,17 @@
 using { sap.fe.cap.travel as my } from '../db/schema';
+using { sap.fe.cap.travel as masterdata} from '../db/master-data.cds';
 
 service TravelService @(path:'/processor') {
 
+  @readonly
+  @cds.autoexpose
+  entity Flight as projection on masterdata.Flight;
+
+  event BookedSeatsOnFlight {
+    ConnectionID : String(4);
+    numberOfSeats : Integer;
+  }
+
   @(restrict: [
     { grant: 'READ', to: 'authenticated-user'},
     { grant: ['rejectTravel','acceptTravel','deductDiscount'], to: 'reviewer'},