Joseph Doherty
72 lines
2.9 KiB
C#
72 lines
2.9 KiB
C#
using Akka.Actor;
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using Akka.Cluster.Tools.PublishSubscribe;
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using Akka.Event;
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using Microsoft.AspNetCore.SignalR;
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using ZB.MOM.WW.OtOpcUa.Commons.Messages.Alerts;
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namespace ZB.MOM.WW.OtOpcUa.AdminUI.Hubs;
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/// <summary>
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/// Akka actor that subscribes to the <c>alerts</c> DistributedPubSub topic and forwards each
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/// <see cref="AlarmTransitionEvent"/> to every SignalR client connected to <see cref="AlertHub"/>.
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/// Mirrors <c>FleetStatusSignalRBridge</c>'s design — one bridge per admin node, hub fan-out is
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/// per-node, no cluster-singleton needed.
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/// </summary>
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public sealed class AlertSignalRBridge : ReceiveActor
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{
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public const string TopicName = "alerts";
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private readonly IHubContext<AlertHub> _hub;
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private readonly IInProcessBroadcaster<AlarmTransitionEvent> _broadcaster;
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private readonly ILoggingAdapter _log = Context.GetLogger();
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/// <summary>
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/// Creates actor props for the AlertSignalRBridge.
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/// </summary>
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/// <param name="hub">The SignalR hub context to send alerts to.</param>
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/// <param name="broadcaster">In-process fan-out read directly by the Blazor Server Alerts page.</param>
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public static Props Props(IHubContext<AlertHub> hub, IInProcessBroadcaster<AlarmTransitionEvent> broadcaster) =>
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Akka.Actor.Props.Create(() => new AlertSignalRBridge(hub, broadcaster));
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/// <summary>
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/// Initializes a new instance of the AlertSignalRBridge actor.
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/// </summary>
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/// <param name="hub">The SignalR hub context to send alerts to.</param>
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/// <param name="broadcaster">In-process fan-out read directly by the Blazor Server Alerts page.</param>
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public AlertSignalRBridge(IHubContext<AlertHub> hub, IInProcessBroadcaster<AlarmTransitionEvent> broadcaster)
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{
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_hub = hub;
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_broadcaster = broadcaster;
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ReceiveAsync<AlarmTransitionEvent>(ForwardAsync);
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// DPS subscription is now live — mark the feed connected so the Blazor "live" pill lights up.
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Receive<SubscribeAck>(_ => _broadcaster.SetConnected(true));
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}
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/// <inheritdoc />
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protected override void PreStart() =>
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DistributedPubSub.Get(Context.System).Mediator.Tell(new Subscribe(TopicName, Self));
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/// <inheritdoc />
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protected override void PostStop()
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{
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// Bridge stopping — the feed is no longer live, drop the "live" pill.
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_broadcaster.SetConnected(false);
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base.PostStop();
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}
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private async Task ForwardAsync(AlarmTransitionEvent msg)
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{
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// In-process fan-out first — this is what the Blazor Server Alerts page reads. The hub push
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// is kept for any out-of-process (e.g. WASM) SignalR client.
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_broadcaster.Publish(msg);
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try
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{
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await _hub.Clients.All.SendAsync(AlertHub.MethodName, msg);
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}
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catch (Exception ex)
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{
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_log.Warning(ex, "AlertSignalRBridge: SignalR push failed for {AlarmId}", msg.AlarmId);
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}
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}
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}
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