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refactor(repositories): move static caches into IMemoryCache, enable within-fixture parallelism

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BattlePassRepository._curveCache and MissionCatalogRepository._maxLevelCache
were private-static fields populated lazily on first read from whatever
DbContext happened to be in scope. In production "one DbContext lineage
per process" makes that fine. Under parallel test execution each
SVSimTestFactory owns its own SQLite :memory: DB, so the first reader's
DB (often empty, in tests that don't seed BP) poisoned the cache for
concurrent readers from a seeded DB — assertions like "BP level info
must be present after seeding" failed because the process-static cache
returned an empty list populated by the other test's empty DB.

The first patch attempted a `BypassCacheForTests` static flag, which is
exactly the kind of test-only seam that rots the production code: future
caches get the same flag, repos accumulate hidden knobs, and the
underlying invariant ("a cache populated from arbitrary scope serves
arbitrary scope") goes unaddressed.

Instead, move both caches into the DI-registered IMemoryCache.
AddMemoryCache() registers it as singleton-per-service-provider:
production has one provider → one IMemoryCache → identical caching
semantics to before. Each WebApplicationFactory builds its own
provider → its own IMemoryCache → cache is naturally scoped per fixture,
no cross-test bleed possible.

The ResetLevelCurveCache() method and its three call sites
(SVSimTestFactory.SeedGlobalsAsync, BattlePassServiceTests,
LoadControllerTests) are deleted — a fresh factory owns a fresh empty
cache, no manual invalidation needed.

With this and the previous StoryService fixture-instance fix in place,
ParallelScope.All works: 776/776 in 57s wall clock (down from 59s on
Fixtures, 2m13s pre-parallelism).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
gamer147
2026-06-01 00:41:09 -04:00
parent 66c456c1c8
commit b1397e3a3e
6 changed files with 44 additions and 63 deletions
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39
SVSim.Database/Repositories/BattlePass/BattlePassRepository.cs
View File

@@ -1,4 +1,5 @@
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using SVSim.Database.Models;
namespace SVSim.Database.Repositories.BattlePass;
@@ -6,14 +7,19 @@ namespace SVSim.Database.Repositories.BattlePass;
public sealed class BattlePassRepository : IBattlePassRepository
{
private readonly SVSimDbContext _db;
private readonly IMemoryCache _cache;
// Process-level cache for the immutable level curve. Bootstrap re-baseline = host restart = cache cleared.
private static IReadOnlyList<BattlePassLevelEntry>? _curveCache;
private static readonly SemaphoreSlim _curveCacheLock = new(1, 1);
// Per-host cache for the immutable level curve, scoped via the DI-registered IMemoryCache.
// In production "host == process"; in tests each WebApplicationFactory builds its own
// service provider so the cache is naturally isolated per fixture — avoids the pre-refactor
// race where a process-static cache populated from one test's DbContext served stale data
// to a parallel test reading from a different DB.
private const string LevelCurveCacheKey = "battlepass:level-curve";
public BattlePassRepository(SVSimDbContext db)
public BattlePassRepository(SVSimDbContext db, IMemoryCache cache)
{
_db = db;
_cache = cache;
}
public async Task<BattlePassSeasonEntry?> GetActiveSeasonAsync(DateTimeOffset when, CancellationToken ct)
@@ -42,25 +48,10 @@ public sealed class BattlePassRepository : IBattlePassRepository
public async Task<IReadOnlyList<BattlePassLevelEntry>> GetLevelCurveAsync(CancellationToken ct)
{
if (_curveCache is not null) return _curveCache;
await _curveCacheLock.WaitAsync(ct);
try
{
if (_curveCache is null)
{
_curveCache = await _db.BattlePassLevels.AsNoTracking()
.OrderBy(e => e.Level)
.ToListAsync(ct);
}
return _curveCache;
}
finally { _curveCacheLock.Release(); }
var cached = await _cache.GetOrCreateAsync(LevelCurveCacheKey, async _ =>
(IReadOnlyList<BattlePassLevelEntry>)await _db.BattlePassLevels.AsNoTracking()
.OrderBy(e => e.Level)
.ToListAsync(ct));
return cached!;
}
/// <summary>
/// Drops the process-level level-curve cache. Tests that seed BattlePassLevels after the
/// cache has already been populated (by an earlier test's HTTP call) must call this before
/// re-seeding so the next read fetches fresh rows.
/// </summary>
internal static void ResetLevelCurveCache() => _curveCache = null;
}