perf(ui): shared KPI cache, live-cache-backed alarm summary, coalesced debug renders

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Notifications/NotificationKpis.razor

@@ -7,7 +7,7 @@
 @using ZB.MOM.WW.ScadaBridge.Commons.Types.Kpi
 @using ZB.MOM.WW.ScadaBridge.Communication
 @using ZB.MOM.WW.ScadaBridge.CentralUI.Services
-@inject CommunicationService CommunicationService
+@inject IKpiSnapshotCache KpiSnapshots
 @inject ISiteRepository SiteRepository
 @inject IKpiHistoryQueryService KpiHistory
 @inject ILogger<NotificationKpis> Logger
@@ -250,15 +250,24 @@
             Logger.LogWarning(ex, "Failed to load sites for the KPI per-site breakdown.");
         }
 
-        await RefreshAll();
+        // First load rides whatever the shared KPI cache already holds fresh; the
+        // Refresh button forces a new query (see RefreshAll).
+        await LoadAllAsync(forceRefresh: false);
     }
 
-    private async Task RefreshAll()
+    // The operator's explicit Refresh bypasses the shared cache's freshness window.
+    private Task RefreshAll() => LoadAllAsync(forceRefresh: true);
+
+    private async Task LoadAllAsync(bool forceRefresh)
     {
         _loading = true;
         // Race-free despite all tasks mutating component fields: Blazor Server runs
         // every continuation on the circuit's single-threaded synchronization context.
-        await Task.WhenAll(LoadGlobalKpis(), LoadPerSiteKpis(), LoadPerNodeKpis(), LoadTrends());
+        await Task.WhenAll(
+            LoadGlobalKpis(forceRefresh),
+            LoadPerSiteKpis(forceRefresh),
+            LoadPerNodeKpis(forceRefresh),
+            LoadTrends());
         _loading = false;
     }
 
@@ -320,12 +329,11 @@
         }
     }
 
-    private async Task LoadGlobalKpis()
+    private async Task LoadGlobalKpis(bool forceRefresh)
     {
         try
         {
-            var response = await CommunicationService.GetNotificationKpisAsync(
-                new NotificationKpiRequest(Guid.NewGuid().ToString("N")));
+            var response = await KpiSnapshots.GetNotificationKpisAsync(forceRefresh);
             if (response.Success)
             {
                 _kpi = response;
@@ -342,12 +350,11 @@
         }
     }
 
-    private async Task LoadPerSiteKpis()
+    private async Task LoadPerSiteKpis(bool forceRefresh)
     {
         try
         {
-            var response = await CommunicationService.GetPerSiteNotificationKpisAsync(
-                new PerSiteNotificationKpiRequest(Guid.NewGuid().ToString("N")));
+            var response = await KpiSnapshots.GetPerSiteNotificationKpisAsync(forceRefresh);
             if (response.Success)
             {
                 _perSite = response.Sites;
@@ -364,12 +371,11 @@
         }
     }
 
-    private async Task LoadPerNodeKpis()
+    private async Task LoadPerNodeKpis(bool forceRefresh)
     {
         try
         {
-            var response = await CommunicationService.GetPerNodeNotificationKpisAsync(
-                new PerNodeNotificationKpiRequest(Guid.NewGuid().ToString("N")));
+            var response = await KpiSnapshots.GetPerNodeNotificationKpisAsync(forceRefresh);
             if (response.Success)
             {
                 _perNode = response.Nodes;