Joseph Doherty
47 lines
1.9 KiB
C#
47 lines
1.9 KiB
C#
namespace ZB.MOM.WW.OtOpcUa.Core.Abstractions;
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/// <summary>
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/// Health snapshot a driver returns to the Core. Drives the status dashboard,
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/// ServiceLevel computation, and Bad-quality fan-out decisions.
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/// </summary>
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/// <param name="State">Current driver-instance state.</param>
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/// <param name="LastSuccessfulRead">Timestamp of the most recent successful equipment read; null if never.</param>
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/// <param name="LastError">
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/// Most recent error message; null when no error has been recorded. The type makes no
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/// guarantee about correlation with <paramref name="State"/> — a driver in
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/// <see cref="DriverState.Healthy"/> may legitimately retain the last error from a recovered
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/// failure (useful for diagnostics), and <see cref="DriverState.Degraded"/> /
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/// <see cref="DriverState.Reconnecting"/> / <see cref="DriverState.Faulted"/> states may all
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/// carry a non-null message. Callers must not key behaviour on the LastError-null ↔ Healthy
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/// pairing.
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/// </param>
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public sealed record DriverHealth(
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DriverState State,
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DateTime? LastSuccessfulRead,
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string? LastError);
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/// <summary>Driver-instance lifecycle state.</summary>
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public enum DriverState
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{
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/// <summary>Driver has not been initialized yet.</summary>
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Unknown,
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/// <summary>Driver is in the middle of <see cref="IDriver.InitializeAsync"/> or <see cref="IDriver.ReinitializeAsync"/>.</summary>
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Initializing,
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/// <summary>Driver is connected and serving data.</summary>
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Healthy,
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/// <summary>Driver is connected but reporting degraded data (e.g. some equipment unreachable, some tags Bad).</summary>
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Degraded,
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/// <summary>Driver lost connection to its data source; reconnecting in the background.</summary>
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Reconnecting,
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/// <summary>
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/// Driver hit an unrecoverable error and stopped trying.
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/// Operator must reinitialize via Admin UI; nodes report Bad quality.
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/// </summary>
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Faulted,
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}
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