Joseph Doherty
39 lines
1.9 KiB
C#
39 lines
1.9 KiB
C#
using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Transport;
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namespace ZB.MOM.WW.ScadaBridge.DeploymentManager;
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/// <summary>
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/// <see cref="IStaleInstanceProbe"/> backed by the deployment flattening pipeline.
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/// Re-flattens an instance through <see cref="IFlatteningPipeline"/> and returns
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/// the computed revision hash — the exact same value
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/// <c>DeploymentService.GetDeploymentComparisonAsync</c> compares against the
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/// deployed snapshot to decide staleness. Hosted in DeploymentManager so the
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/// Transport component (which references only Commons + TemplateEngine) can probe
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/// staleness without taking a DeploymentManager project reference.
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/// </summary>
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public sealed class StaleInstanceProbe : IStaleInstanceProbe
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{
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private readonly IFlatteningPipeline _flatteningPipeline;
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/// <summary>Initializes a new <see cref="StaleInstanceProbe"/>.</summary>
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/// <param name="flatteningPipeline">The deployment flattening pipeline used to recompute the current revision hash.</param>
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public StaleInstanceProbe(IFlatteningPipeline flatteningPipeline)
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{
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_flatteningPipeline = flatteningPipeline ?? throw new ArgumentNullException(nameof(flatteningPipeline));
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}
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/// <inheritdoc />
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public async Task<string?> GetCurrentRevisionHashAsync(int instanceId, CancellationToken cancellationToken = default)
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{
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// The pipeline returns a Result; a flatten failure (e.g. unresolvable
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// template chain mid-import) yields null so the caller treats the
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// instance as "staleness indeterminate" and skips it. Flattening reuses
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// the scoped ITemplateEngineRepository, so it observes template rows the
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// in-flight import has staged on the shared change tracker.
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var result = await _flatteningPipeline
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.FlattenAndValidateAsync(instanceId, cancellationToken)
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.ConfigureAwait(false);
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return result.IsSuccess ? result.Value.RevisionHash : null;
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}
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}
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