Joseph Doherty
39 lines
1.3 KiB
C#
39 lines
1.3 KiB
C#
namespace ZB.MOM.WW.OtOpcUa.Commons.OpcUa;
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/// <summary>
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/// Late-binding adapter that accepts and retains the latest requested ServiceLevel until
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/// the SDK publisher is available. Binding synchronously replays that request, including zero.
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/// </summary>
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/// <remarks>
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/// Publishing and binding are serialized through the synchronous inner call. Inner publishers
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/// must not call back into this adapter. Acceptance while unbound is not an SDK write confirmation.
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/// A failed call retains both the requested level and the installed publisher for later recovery.
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/// </remarks>
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public sealed class DeferredServiceLevelPublisher : IServiceLevelPublisher
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{
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private readonly object _gate = new();
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private IServiceLevelPublisher? _inner;
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private byte? _latest;
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/// <summary>Bind and replay the latest request, or unbind while retaining that request.</summary>
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/// <param name="inner">The publisher implementation to use, or null to unbind.</param>
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public void SetInner(IServiceLevelPublisher? inner)
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{
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lock (_gate)
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{
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_inner = inner;
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if (_latest is { } latest) _inner?.Publish(latest);
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}
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}
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/// <inheritdoc />
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public void Publish(byte serviceLevel)
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{
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lock (_gate)
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{
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_latest = serviceLevel;
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_inner?.Publish(serviceLevel);
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}
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}
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}
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