80 lines
2.5 KiB
C#
80 lines
2.5 KiB
C#
using VigilCare.Simulation;
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public interface IScenarioCatalog
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{
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IReadOnlyList<ScenarioFile> ListScenarios();
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ScenarioFile? GetById(string scenarioId);
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}
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public sealed class ScenarioCatalog : IScenarioCatalog
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{
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private readonly string _directory;
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private readonly object _gate = new();
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private IReadOnlyList<(ScenarioFile Scenario, string Path, DateTime LastWriteUtc)> _entries =
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Array.Empty<(ScenarioFile, string, DateTime)>();
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public ScenarioCatalog(Microsoft.Extensions.Options.IOptions<SimulationOptions> options)
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{
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_directory = options.Value.ScenarioDirectory;
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}
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public IReadOnlyList<ScenarioFile> ListScenarios()
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{
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RefreshIfNeeded();
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return _entries.Select(e => e.Scenario).ToList();
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}
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public ScenarioFile? GetById(string scenarioId)
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{
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RefreshIfNeeded();
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return _entries
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.Select(e => e.Scenario)
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.FirstOrDefault(s => string.Equals(
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s.Scenario.Id, scenarioId, StringComparison.OrdinalIgnoreCase));
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}
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private void RefreshIfNeeded()
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{
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lock (_gate)
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{
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if (!Directory.Exists(_directory))
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{
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_entries = Array.Empty<(ScenarioFile, string, DateTime)>();
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return;
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}
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var disk = Directory.EnumerateFiles(_directory, "*.json")
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.Where(p => !string.Equals(
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Path.GetFileName(p), "schema.json", StringComparison.OrdinalIgnoreCase))
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.Select(p => (Path: p, LastWriteUtc: File.GetLastWriteTimeUtc(p)))
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.OrderBy(x => x.Path, StringComparer.OrdinalIgnoreCase)
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.ToList();
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var unchanged = _entries.Count == disk.Count
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&& _entries.Zip(disk, (cached, onDisk) =>
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cached.Path == onDisk.Path && cached.LastWriteUtc == onDisk.LastWriteUtc)
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.All(eq => eq);
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if (unchanged)
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return;
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var loaded = new List<(ScenarioFile Scenario, string Path, DateTime LastWriteUtc)>();
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foreach (var file in disk)
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{
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try
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{
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loaded.Add((ScenarioLoader.Load(file.Path), file.Path, file.LastWriteUtc));
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}
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catch
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{
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// Skip corrupt files — catalogue must stay resilient.
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}
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}
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_entries = loaded
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.OrderBy(e => e.Scenario.Scenario.Id, StringComparer.OrdinalIgnoreCase)
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.ToList();
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}
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}
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}
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