413 lines
22 KiB
C#
413 lines
22 KiB
C#
#nullable enable
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using System;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using GameCult.Caching.MessagePack;
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using MessagePack;
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using NUnit.Framework;
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using static GameCult.Caching.Tests.ElementIdTests;
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namespace GameCult.Caching.Tests
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{
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// A single-file store file is read and written without a cache through ReadStoreSnapshot, WriteRecord and WriteDocument: the same reader, lock,
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// atomic replace and header rule a cache's store uses. CultMesh's single-file document helpers are built on these members.
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public class CachelessSingleFileTests
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{
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private static readonly CultSchemaCatalogEntry One = new() { SchemaId = "tests.cacheless.one", SchemaName = "tests.cacheless.one" };
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private static readonly CultSchemaCatalogEntry Two = new() { SchemaId = "tests.cacheless.two", SchemaName = "tests.cacheless.two" };
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private string _directory = "";
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private string _path = "";
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[SetUp]
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public void SetUp()
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{
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_directory = Path.Combine(Path.GetTempPath(), "cultlib-cacheless-" + Guid.NewGuid().ToString("N"));
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Directory.CreateDirectory(_directory);
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_path = Path.Combine(_directory, "store.cc");
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}
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[TearDown]
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public void TearDown()
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{
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if (Directory.Exists(_directory))
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Directory.Delete(_directory, true);
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}
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private static CultCodec Codec(CultDocumentRegistry? registry = null) =>
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CultCacheMessagePack.CreateCodec(registry ?? CultDocumentRegistry.Shared);
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[CultDocument("tests.cacheless.base", "tests.cacheless.base.v1")]
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[MessagePackObject]
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public class DeclaredBase
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{
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[Key(0)] [CultName] public string Name { get; set; } = "";
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}
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[MessagePackObject]
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public sealed class UndeclaredDerived : DeclaredBase
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{
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[Key(1)] public string Extra { get; set; } = "";
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}
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// Reads the store file as a SingleFileMessagePackBackingStore does, and holds the first reader inside ReadStore so a test can
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// see whether a second one gets in beside it.
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private sealed class GatedStore : SingleFileBackingStore
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{
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private int _held;
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private int _inside;
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private int _mostInside;
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public readonly ManualResetEventSlim Entered = new();
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public readonly ManualResetEventSlim Release = new();
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public CultDocumentRegistry? RegistryBeforeWait;
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public CultDocumentRegistry? RegistryAfterWait;
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public GatedStore(string path) : base(path) { }
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public int MostInside => Volatile.Read(ref _mostInside);
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protected override byte[] SerializeStore(string formatVersion, System.Collections.Generic.IReadOnlyList<byte[]> catalogEntries, System.Collections.Generic.IReadOnlyList<byte[]> records) =>
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CultDocumentMessagePackSerialization.SerializeStore(formatVersion, catalogEntries, records);
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protected override byte[] SerializeRecord(CultPersistedRecord record) =>
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CultDocumentMessagePackSerialization.SerializePersistedRecord(record);
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protected override byte[] SerializeCatalogEntry(CultSchemaCatalogEntry entry) =>
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CultDocumentMessagePackSerialization.SerializeCatalogEntry(entry);
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protected override (CultPersistedStoreSnapshot Snapshot, byte[][] CatalogBytes, byte[][] RecordBytes) ReadStore(byte[] data)
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{
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var inside = Interlocked.Increment(ref _inside);
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int seen;
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while ((seen = MostInside) < inside && Interlocked.CompareExchange(ref _mostInside, inside, seen) != seen) { }
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Entered.Set();
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try
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{
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if (Interlocked.Exchange(ref _held, 1) == 0)
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{
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RegistryBeforeWait = AttachedRegistry;
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Release.Wait(TimeSpan.FromSeconds(30));
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RegistryAfterWait = AttachedRegistry;
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}
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var store = CultDocumentMessagePackSerialization.ReadStore(data);
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CultDocumentMessagePackSerialization.RequireSingleFileFormat(store.Snapshot);
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return store;
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}
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finally
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{
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Interlocked.Decrement(ref _inside);
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}
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}
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protected override byte[] SerializePayload(object document, Type documentType) =>
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CultDocumentMessagePackSerialization.SerializeUntyped(document, documentType, Registry);
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protected override object DeserializePayload(Type documentType, byte[] payload) =>
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CultDocumentMessagePackSerialization.DeserializeUntyped(documentType, payload, Registry);
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}
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// ReadStoreSnapshot takes the store's gate: while one read is inside the reader, a second does not enter beside it.
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[Test]
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public async Task ReadStoreSnapshotTakesTheStoresGate()
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{
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 1), One);
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var store = new GatedStore(_path);
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var first = Task.Run(() => store.ReadStoreSnapshot());
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Assert.That(store.Entered.Wait(TimeSpan.FromSeconds(10)), Is.True, "the first read reached the reader");
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var second = Task.Run(() => store.ReadStoreSnapshot());
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await Task.Delay(500);
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var mostInside = store.MostInside;
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store.Release.Set();
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await Task.WhenAll(first, second);
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Assert.That(mostInside, Is.EqualTo(1), "a second read waits at the gate while the first is inside the reader");
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Assert.That(first.Result!.Records, Has.Length.EqualTo(1));
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Assert.That(second.Result!.Records, Has.Length.EqualTo(1));
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}
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// A call's registry is attached under the store's gate: a second call with another registry waits for the first, so the
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// first sees its own registry from its start to its end.
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[Test]
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public async Task ACallKeepsItsRegistryWhileAnotherCallWaits()
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{
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var mine = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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var other = CultDocumentRegistry.ForTypes(new[] { typeof(DeclaredBase) });
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 1), One);
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var store = new GatedStore(_path);
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var first = Task.Run(() => store.WriteDocument(new CultRecordKey("first"), new IdDeck { Name = "first" }, registry: mine));
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Assert.That(store.Entered.Wait(TimeSpan.FromSeconds(10)), Is.True, "the first call reached the reader");
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var second = Task.Run(() => store.WriteDocument(new CultRecordKey("second"), new DeclaredBase { Name = "second" }, registry: other));
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await Task.Delay(500);
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store.Release.Set();
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await Task.WhenAll(first, second);
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Assert.That(store.RegistryBeforeWait, Is.SameAs(mine));
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Assert.That(store.RegistryAfterWait, Is.SameAs(mine), "the second call's registry did not replace the first's mid-call");
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Assert.That(new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!.Records.Select(record => record.Key), Is.EquivalentTo(new[] { "a", "first", "second" }));
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}
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// WriteDocument<T> stores the document as T: the schema id, the id plan, the header and the bytes all come from the one
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// declared type, as they did when CultMesh encoded typeof(T).
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[Test]
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public void WriteDocumentEncodesTheDeclaredTypeNotTheRuntimeType()
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(DeclaredBase) });
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new SingleFileMessagePackBackingStore(_path).WriteDocument<DeclaredBase>(new CultRecordKey("d"), new UndeclaredDerived { Name = "n", Extra = "x" }, registry: registry);
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var record = new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!.Records.Single();
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var asBase = CultDocumentMessagePackSerialization.SerializeUntyped(new DeclaredBase { Name = "n" }, typeof(DeclaredBase), registry);
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Assert.That(record.SchemaId, Is.EqualTo(registry.GetRequired<DeclaredBase>().SchemaId));
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Assert.That(record.Payload, Is.EqualTo(asBase), "base bytes under the base schema: one slot, not the derived type's two");
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}
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// The registry is the call's argument. A typed call on a store instance leaves nothing behind, so a later WriteRecord that
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// gives none decides the header as a fresh instance does.
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[Test]
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public async Task ATypedCallLeavesNoRegistryOnTheStore()
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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using (var cache = new CultCache(registry))
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{
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cache.AddBackingStore(new SingleFileMessagePackBackingStore(_path));
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await cache.AddAsync(new IdDeck { Name = "deck", Reels = { new IdReel { Label = "reel" } } });
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cache.FlushAllBackingStores();
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}
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void Unmark()
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{
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var written = CultDocumentMessagePackSerialization.DeserializeSnapshot(File.ReadAllBytes(_path));
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written.FormatVersion = CultPersistedStoreSnapshot.FormatV1;
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File.WriteAllBytes(_path, CultDocumentMessagePackSerialization.SerializeSnapshot(written));
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}
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Unmark();
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var store = new SingleFileMessagePackBackingStore(_path);
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store.WriteDocument(new CultRecordKey("again"), new IdDeck { Name = "again" }, registry: registry);
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Assert.That(store.ReadStoreSnapshot()!.FormatVersion, Is.EqualTo(CultPersistedStoreSnapshot.FormatV3), "the typed call, given a registry, read the copied ids");
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Unmark();
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store.WriteRecord(Record("other", One, 1), One, holdsIds: false, registry: null);
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Assert.That(store.ReadStoreSnapshot()!.FormatVersion, Is.EqualTo(CultPersistedStoreSnapshot.FormatV1), "a write given no registry decides nothing for copied records");
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}
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private static CultPersistedRecord Record(string key, CultSchemaCatalogEntry entry, params byte[] payload) =>
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new() { Key = key, SchemaId = entry.SchemaId, StoredAt = "2026-10-22T00:00:00.0000000+00:00", Payload = payload };
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[Test]
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public void WriteRecordKeepsAnotherWritersRecord()
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{
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 1), One);
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("b", Two, 2), Two);
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 3), One);
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var snapshot = new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!;
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Assert.That(snapshot.Records, Has.Length.EqualTo(2));
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Assert.That(Array.Find(snapshot.Records, record => record.Key == "a")!.Payload, Is.EqualTo(new byte[] { 3 }));
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Assert.That(Array.Find(snapshot.Records, record => record.Key == "b")!.Payload, Is.EqualTo(new byte[] { 2 }));
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Assert.That(snapshot.SchemaCatalog, Has.Length.EqualTo(2));
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}
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[Test]
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public void WriteRecordRefusesOnAStoreAttachedToACache()
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{
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 1), One);
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var before = File.ReadAllBytes(_path);
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var store = new SingleFileMessagePackBackingStore(_path);
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using var cache = new CultCache();
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cache.AddBackingStore(store);
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var error = Assert.Throws<InvalidOperationException>(() => store.WriteRecord(Record("b", Two, 2), Two))!;
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Assert.That(error.Message, Does.Contain("write through the cache"));
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Assert.That(File.ReadAllBytes(_path), Is.EqualTo(before));
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}
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[Test]
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public void ReadStoreSnapshotOfNothingIsNull()
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{
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Assert.That(new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot(), Is.Null);
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}
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[Test]
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public void ReadStoreSnapshotRefusesAV4Stamp()
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{
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 1), One);
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var snapshot = CultDocumentMessagePackSerialization.DeserializeSnapshot(File.ReadAllBytes(_path));
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snapshot.FormatVersion = "cultcache.store.v4";
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File.WriteAllBytes(_path, CultDocumentMessagePackSerialization.SerializeSnapshot(snapshot));
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var error = Assert.Throws<CultStoreUnreadableException>(() => new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot())!;
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Assert.That(error.Message, Does.Contain("cultcache.store.v4"));
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}
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[Test]
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public void WriteRecordWithIdsMarksV3()
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{
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 1), One);
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Assert.That(new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!.FormatVersion, Is.Not.EqualTo(CultPersistedStoreSnapshot.FormatV3));
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("b", Two, 2), Two, holdsIds: true);
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Assert.That(new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!.FormatVersion, Is.EqualTo(CultPersistedStoreSnapshot.FormatV3));
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}
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[Test]
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public void WriteRecordRefusesNullArguments()
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{
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var store = new SingleFileMessagePackBackingStore(_path);
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Assert.Throws<ArgumentNullException>(() => store.WriteRecord(null!, One));
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Assert.Throws<ArgumentNullException>(() => store.WriteRecord(Record("a", One, 1), null!));
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Assert.That(File.Exists(_path), Is.False);
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}
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[Test]
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public void ARefusedWriteDocumentOnAnAttachedStoreNeverReachesTheRegistryItWasGiven()
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{
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var store = new SingleFileMessagePackBackingStore(_path);
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using var cache = new CultCache(CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) }));
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cache.AddBackingStore(store);
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var elsewhere = CultDocumentRegistry.ForTypes(new[] { typeof(StoreRoutingTests.RoutingNote) });
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var error = Assert.Throws<InvalidOperationException>(() => store.WriteDocument(new CultRecordKey("deck"), new IdDeck { Name = "d" }, registry: elsewhere))!;
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Assert.That(error.Message, Does.Contain("write through the cache"));
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}
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[Test]
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public void WriteDocumentRefusesANullDocumentAndDecodeDocumentANullPayload()
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{
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var store = new SingleFileMessagePackBackingStore(_path);
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Assert.Throws<ArgumentNullException>(() => store.WriteDocument<IdDeck>(new CultRecordKey("deck"), null!));
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Assert.Throws<ArgumentNullException>(() => Codec().DecodeDocument<IdDeck>(new CultRecordKey("deck"), null!));
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}
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[Test]
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public void WriteDocumentStoresTheGivenStoredAtAndOtherwiseNow()
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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var store = new SingleFileMessagePackBackingStore(_path);
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store.WriteDocument(new CultRecordKey("fixed"), new IdDeck { Name = "a" }, "2026-01-02T03:04:05.0000000+00:00", registry);
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store.WriteDocument(new CultRecordKey("now"), new IdDeck { Name = "b" }, null, registry);
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store.WriteDocument(new CultRecordKey("blank"), new IdDeck { Name = "c" }, " ", registry);
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var records = new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!.Records.ToDictionary(record => record.Key);
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Assert.That(records["fixed"].StoredAt, Is.EqualTo("2026-01-02T03:04:05.0000000+00:00"));
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Assert.That(records["now"].StoredAt, Does.Match(@"^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d\.\d{7}\+00:00$"), "round-trip format");
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Assert.That(DateTimeOffset.Parse(records["now"].StoredAt), Is.EqualTo(DateTimeOffset.UtcNow).Within(TimeSpan.FromMinutes(5)));
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Assert.That(DateTimeOffset.Parse(records["blank"].StoredAt), Is.EqualTo(DateTimeOffset.UtcNow).Within(TimeSpan.FromMinutes(5)));
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}
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[Test]
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public void WriteDocumentMintsRandomIdsAndDecodeDocumentMintsTheSameIdsEveryTime()
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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string Written(string name)
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{
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var path = Path.Combine(_directory, name);
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var deck = new IdDeck { Name = "deck", Reels = { new IdReel { Label = "reel" } } };
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new SingleFileMessagePackBackingStore(path).WriteDocument(new CultRecordKey("deck"), deck, registry: registry);
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return deck.Reels[0].Id;
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}
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Assert.That(Written("one.cc"), Is.Not.EqualTo(Written("two.cc")), "a write mints random ids");
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var unset = CultDocumentMessagePackSerialization.SerializeUntyped(new IdDeck { Name = "deck", Reels = { new IdReel { Label = "reel" } } }, typeof(IdDeck), registry);
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var first = Codec(registry).DecodeDocument<IdDeck>(new CultRecordKey("deck"), unset).Reels[0].Id;
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var second = Codec(registry).DecodeDocument<IdDeck>(new CultRecordKey("deck"), unset).Reels[0].Id;
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Assert.That(first, Does.Match("^[0-9a-f]{12}$"));
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Assert.That(second, Is.EqualTo(first), "a load mints from the key and path, so every reader mints the same id");
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}
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// The write is under the store's lock and waits for it: a write that finds the lock held lands after it is released, and
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// never without it.
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[Test]
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public async Task WriteRecordWaitsForTheStoreLock()
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{
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var write = default(Task);
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using (new FileStream(_path + ".lock", FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
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{
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write = Task.Run(() => new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("a", One, 1), One));
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await Task.Delay(500);
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Assert.That(write.IsCompleted, Is.False, "the write waits while another holder has the lock");
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Assert.That(File.Exists(_path), Is.False);
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}
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await write;
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Assert.That(new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!.Records, Has.Length.EqualTo(1));
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}
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// The registry the payload was encoded with lets the write decide the header for the records it copies: another runtime may
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// have written ids under an unmarked header, and a write that can read them marks the store. Without a registry it decides
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// nothing for them.
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[TestCase(true, CultPersistedStoreSnapshot.FormatV3)]
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[TestCase(false, CultPersistedStoreSnapshot.FormatV1)]
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public async Task WriteRecordGivenARegistryMarksAStoreWhoseCopiedRecordHoldsIds(bool withRegistry, string expected)
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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using (var cache = new CultCache(registry))
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{
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cache.AddBackingStore(new SingleFileMessagePackBackingStore(_path));
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await cache.AddAsync(new IdDeck { Name = "deck", Reels = { new IdReel { Label = "reel" } } });
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cache.FlushAllBackingStores();
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}
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var written = CultDocumentMessagePackSerialization.DeserializeSnapshot(File.ReadAllBytes(_path));
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Assert.That(written.FormatVersion, Is.EqualTo(CultPersistedStoreSnapshot.FormatV3), "the cache marked the store it wrote ids into");
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written.FormatVersion = CultPersistedStoreSnapshot.FormatV1;
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File.WriteAllBytes(_path, CultDocumentMessagePackSerialization.SerializeSnapshot(written));
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("other", One, 1), One, holdsIds: false, registry: withRegistry ? registry : null);
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Assert.That(new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!.FormatVersion, Is.EqualTo(expected));
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}
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[Test]
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public void WriteDocumentMintsIdsMarksV3AndKeepsTheOtherRecord()
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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new SingleFileMessagePackBackingStore(_path).WriteRecord(Record("other", One, 1), One);
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var deck = new IdDeck { Name = "deck", Reels = { new IdReel { Label = "reel" } } };
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new SingleFileMessagePackBackingStore(_path).WriteDocument(new CultRecordKey("deck"), deck, registry: registry);
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var snapshot = new SingleFileMessagePackBackingStore(_path).ReadStoreSnapshot()!;
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Assert.That(snapshot.FormatVersion, Is.EqualTo(CultPersistedStoreSnapshot.FormatV3));
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Assert.That(snapshot.Records.Select(record => record.Key), Is.EquivalentTo(new[] { "other", "deck" }));
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Assert.That(deck.Reels[0].Id, Does.Match("^[0-9a-f]{12}$"), "the id the file holds was minted on the document");
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var read = Codec(registry).DecodeDocument<IdDeck>(new CultRecordKey("deck"), snapshot.Records.Single(record => record.Key == "deck").Payload);
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Assert.That(read.Reels[0].Id, Is.EqualTo(deck.Reels[0].Id));
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}
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[Test]
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public void WriteDocumentGivesMintedIdsBackWhenTheWriteIsRefused()
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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File.WriteAllBytes(_path, new byte[] { 0xC1 });
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var deck = new IdDeck { Name = "deck", Reels = { new IdReel { Label = "reel" } } };
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Assert.Throws<CultStoreUnreadableException>(() =>
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new SingleFileMessagePackBackingStore(_path).WriteDocument(new CultRecordKey("deck"), deck, registry: registry));
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Assert.That(deck.Reels[0].Id, Is.Null.Or.Empty, "a refused write leaves the document as it was");
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}
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[Test]
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public void WriteDocumentRefusesOnAStoreAttachedToACache()
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{
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var registry = CultDocumentRegistry.ForTypes(new[] { typeof(IdDeck) });
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var store = new SingleFileMessagePackBackingStore(_path);
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using var cache = new CultCache(registry);
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cache.AddBackingStore(store);
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Assert.That(Assert.Throws<InvalidOperationException>(() => store.WriteDocument(new CultRecordKey("deck"), new IdDeck { Name = "d" }))!.Message, Does.Contain("write through the cache"));
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Assert.That(File.Exists(_path), Is.False);
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}
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}
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}
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