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fix: move to concurrent dictionary instead of hash set for impossible routes

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This commit is contained in:
Andrew Welker 2026-04-17 10:02:19 -05:00
parent 4a59cf9f81
commit db14a614bc
1 changed files with 5 additions and 3 deletions
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8
src/PepperDash.Essentials.Core/Routing/Extensions.cs
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@ -1,4 +1,5 @@
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
@ -56,8 +57,9 @@ namespace PepperDash.Essentials.Core
/// <summary>
/// Cache of failed route attempts to avoid re-checking impossible paths.
/// Format: "sourceKey|destKey|signalType"
/// Uses ConcurrentDictionary as a thread-safe set (byte value is unused).
/// </summary>
private static readonly HashSet<string> _impossibleRoutes = new HashSet<string>();
private static readonly ConcurrentDictionary<string, byte> _impossibleRoutes = new ConcurrentDictionary<string, byte>();
/// <summary>
/// Indexes all TieLines by source and destination device keys for faster lookups.
@ -579,7 +581,7 @@ namespace PepperDash.Essentials.Core
// Check if this route has already been determined to be impossible
var routeKey = GetRouteKey(source.Key, destination.Key, signalType);
if (_impossibleRoutes.Contains(routeKey))
if (_impossibleRoutes.ContainsKey(routeKey))
{
Debug.LogMessage(LogEventLevel.Verbose, "Route {0} is cached as impossible, skipping", null, routeKey);
return false;
@ -681,7 +683,7 @@ namespace PepperDash.Essentials.Core
Debug.LogMessage(LogEventLevel.Verbose, "No route found to {0}", destination, source.Key);
// Cache this as an impossible route
_impossibleRoutes.Add(routeKey);
_impossibleRoutes.TryAdd(routeKey, 0);
return false;
}