Joseph Doherty
42 lines
1.7 KiB
C#
42 lines
1.7 KiB
C#
using ScadaLink.Commons.Messages.Health;
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namespace ScadaLink.HealthMonitoring;
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/// <summary>
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/// In-memory state for a single site's health, stored by the central aggregator.
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/// Immutable: every state transition produces a new instance which the aggregator
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/// installs into its <c>ConcurrentDictionary</c> via an atomic compare-and-swap.
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/// This makes handing the reference straight to UI callers safe — a consumer can
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/// never observe a torn or half-applied update.
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/// </summary>
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public sealed record SiteHealthState
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{
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public required string SiteId { get; init; }
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/// <summary>
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/// The latest full <see cref="SiteHealthReport"/> received for the site, or
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/// <c>null</c> if the site is known only via heartbeats and has not yet sent
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/// a report.
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/// </summary>
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public SiteHealthReport? LatestReport { get; init; }
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/// <summary>
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/// Time the latest full <see cref="SiteHealthReport"/> was processed.
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/// Used by the UI to surface report staleness during failover.
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/// </summary>
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public DateTimeOffset LastReportReceivedAt { get; init; }
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/// <summary>
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/// Time the most recent signal of any kind (full report OR heartbeat) was
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/// received. Drives offline detection — heartbeats from the standby keep the
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/// site marked online even when the active node is unable to produce a report
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/// (mid-failover, brief stalls). Heartbeat cadence is owned by the Cluster
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/// Infrastructure / SiteCommunicationActor (every
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/// CommunicationOptions.TransportHeartbeatInterval — 5s by default).
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/// </summary>
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public DateTimeOffset LastHeartbeatAt { get; init; }
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public long LastSequenceNumber { get; init; }
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public bool IsOnline { get; init; }
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}
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