Joseph Doherty
a04196d725
The driver-status and resilience stores had no removal path, so a deleted driver stayed on /hosts as a frozen row until restart. Both stores gain RetainOnly, which /hosts calls after each successful config load (never on a failed one). The stores and InProcessBroadcaster now raise their events one subscriber at a time, so a throwing handler cannot starve later subscribers or escape onto the bridge actor. The alert/script-log bridges publish inside their try, and the resilience bridge catches a store failure instead of restarting. Refs #745 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
40 lines
1.7 KiB
C#
40 lines
1.7 KiB
C#
namespace ZB.MOM.WW.OtOpcUa.AdminUI.Hubs;
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/// <summary>
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/// Raises a multicast delegate one subscriber at a time, so a subscriber that throws cannot stop
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/// delivery to the subscribers after it. The in-process stores and broadcasters raise their events on
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/// the bridge actor's thread; a plain <c>handler?.Invoke(x)</c> stops at the first throwing handler (for
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/// example a Blazor circuit whose renderer is mid-teardown), so the remaining panels miss the update and
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/// the exception escapes into the bridge actor, which restarts it.
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/// </summary>
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internal static class SafeMulticast
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{
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/// <summary>Invokes every subscriber of <paramref name="handler"/> with <paramref name="arg"/>, isolating failures.</summary>
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/// <typeparam name="T">The event payload type.</typeparam>
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/// <param name="handler">The captured multicast delegate; null means no subscribers.</param>
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/// <param name="arg">The payload passed to each subscriber.</param>
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/// <param name="onError">Optional sink for a subscriber's exception; it must not throw.</param>
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/// <returns>The number of subscribers that threw.</returns>
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public static int Invoke<T>(Action<T>? handler, T arg, Action<Exception>? onError = null)
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{
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if (handler is null) return 0;
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var failures = 0;
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foreach (var subscriber in handler.GetInvocationList())
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{
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try
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{
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((Action<T>)subscriber)(arg);
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}
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catch (Exception ex)
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{
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failures++;
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try { onError?.Invoke(ex); }
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catch { /* the error sink must never take delivery down with it */ }
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}
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}
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return failures;
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}
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}
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