Joseph Doherty
50 lines
2.2 KiB
C#
50 lines
2.2 KiB
C#
using ZB.MOM.WW.OtOpcUa.Commons.OpcUa;
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using ZB.MOM.WW.OtOpcUa.Core.Abstractions;
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namespace ZB.MOM.WW.OtOpcUa.Runtime.Drivers;
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/// <summary>
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/// Derives a full Part 9 <see cref="AlarmConditionSnapshot"/> from each native
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/// <see cref="AlarmEventArgs"/> delta, tracking per-condition-NodeId prior state. Owned by the
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/// single-threaded <c>DriverHostActor</c> (no locking). Native alarms carry only a transition
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/// <see cref="AlarmTransitionKind"/>, not a full state machine, so this is the translation the
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/// scripted-alarm engine does internally.
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/// </summary>
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public sealed class NativeAlarmProjector
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{
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private readonly Dictionary<string, (bool Active, bool Acked)> _prior = new(StringComparer.Ordinal);
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/// <summary>Project an alarm transition onto the full condition snapshot for <paramref name="nodeId"/>.</summary>
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/// <param name="nodeId">The materialised condition node's id (the projection's state key).</param>
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/// <param name="e">The native alarm transition.</param>
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/// <returns>The full Part 9 condition snapshot to write to the node.</returns>
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public AlarmConditionSnapshot Project(string nodeId, AlarmEventArgs e)
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{
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var prev = _prior.TryGetValue(nodeId, out var p) ? p : (Active: false, Acked: true);
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var sev = MapSeverity(e.Severity);
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var (active, acked) = e.Kind switch
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{
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AlarmTransitionKind.Raise or AlarmTransitionKind.Retrigger => (true, false),
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AlarmTransitionKind.Acknowledge => (prev.Active, true),
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AlarmTransitionKind.Clear => (false, prev.Acked),
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_ => (prev.Active, prev.Acked),
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};
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_prior[nodeId] = (active, acked);
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return new AlarmConditionSnapshot(
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Active: active, Acknowledged: acked, Confirmed: true, Enabled: true,
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Shelving: AlarmShelvingKind.Unshelved, Severity: sev, Message: e.Message);
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}
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/// <summary>Clears all tracked per-node state (call on address-space rebuild).</summary>
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public void Clear() => _prior.Clear();
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private static ushort MapSeverity(AlarmSeverity s) => s switch
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{
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AlarmSeverity.Low => 200,
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AlarmSeverity.Medium => 500,
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AlarmSeverity.High => 700,
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AlarmSeverity.Critical => 900,
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_ => 500,
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};
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}
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