Joseph Doherty
eabf270d71
Resolve all 622 issues flagged by the enhanced CommentChecker: add missing <returns> tags (incl. the standard phrasing on non-generic Task methods), add missing <summary> tags, and replace misused/redundant <inheritdoc/> on members that override or implement nothing with real documentation. Documentation-only — no behavior change; solution builds clean.
62 lines
2.4 KiB
C#
62 lines
2.4 KiB
C#
using Microsoft.Extensions.Hosting;
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using Microsoft.Extensions.Logging;
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using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Transport;
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namespace ZB.MOM.WW.ScadaBridge.Transport.Import;
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/// <summary>
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/// T-007: periodic background sweep that drives <see cref="IBundleSessionStore.EvictExpired"/>
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/// so abandoned import sessions clear from memory on their own, without needing a
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/// new <see cref="IBundleSessionStore.Get"/> to trigger lazy eviction. Each session
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/// owns the decrypted bundle content (potentially up to ~100 MB of secrets — DB
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/// connection strings, SMTP credentials, external-system auth configs), and the
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/// design contract is "bundles are not retained server-side after ApplyAsync
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/// commits". This service keeps abandoned / failed sessions from pinning that
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/// plaintext for the full 30-minute TTL when no other traffic flows.
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/// </summary>
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internal sealed class BundleSessionEvictionService : BackgroundService
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{
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private static readonly TimeSpan SweepInterval = TimeSpan.FromMinutes(1);
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private readonly IBundleSessionStore _sessionStore;
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private readonly ILogger<BundleSessionEvictionService> _logger;
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/// <summary>
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/// Initializes a new instance of <see cref="BundleSessionEvictionService"/>.
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/// </summary>
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/// <param name="sessionStore">The bundle session store to sweep for expired sessions.</param>
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/// <param name="logger">Logger for sweep diagnostics.</param>
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public BundleSessionEvictionService(
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IBundleSessionStore sessionStore,
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ILogger<BundleSessionEvictionService> logger)
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{
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_sessionStore = sessionStore ?? throw new ArgumentNullException(nameof(sessionStore));
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_logger = logger ?? throw new ArgumentNullException(nameof(logger));
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}
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/// <inheritdoc />
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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while (!stoppingToken.IsCancellationRequested)
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{
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try
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{
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await Task.Delay(SweepInterval, stoppingToken).ConfigureAwait(false);
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}
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catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
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{
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return;
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}
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try
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{
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_sessionStore.EvictExpired();
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "Bundle session sweep failed; will retry on next interval.");
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}
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}
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}
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}
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