fix(ui): reentrancy guard on Health/AlarmSummary poll timers (arch-review S3)

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj
2026-07-10 05:01:27 -04:00
parent bd6c310825
commit adc488a9f9
4 changed files with 50 additions and 4 deletions
@@ -444,6 +444,7 @@
    private IReadOnlyDictionary<string, SiteHealthState> _siteStates = new Dictionary<string, SiteHealthState>();
    private Dictionary<string, string> _siteNames = new();
    private Timer? _refreshTimer;
+    private readonly ZB.MOM.WW.ScadaBridge.CentralUI.Services.PollGate _pollGate = new();
    private int _autoRefreshSeconds = 10;

    // Notification Outbox headline KPIs, refreshed alongside the site states.
@@ -542,10 +543,18 @@

        _refreshTimer = new Timer(_ =>
        {
+            if (!_pollGate.TryEnter()) return;
            InvokeAsync(async () =>
            {
-                await RefreshNow();
-                StateHasChanged();
+                try
+                {
+                    await RefreshNow();
+                    StateHasChanged();
+                }
+                finally
+                {
+                    _pollGate.Exit();
+                }
            });
        }, null, TimeSpan.FromSeconds(_autoRefreshSeconds), TimeSpan.FromSeconds(_autoRefreshSeconds));
    }