mirror of
https://github.com/ppy/osu.git
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1258 lines
56 KiB
C#
1258 lines
56 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Threading;
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using System.Threading.Tasks;
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using osu.Framework;
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using osu.Framework.Allocation;
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using osu.Framework.Development;
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using osu.Framework.Extensions;
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using osu.Framework.Extensions.EnumExtensions;
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using osu.Framework.Input.Bindings;
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using osu.Framework.Logging;
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using osu.Framework.Platform;
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using osu.Framework.Statistics;
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using osu.Framework.Threading;
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using osu.Game.Beatmaps;
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using osu.Game.Beatmaps.Legacy;
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using osu.Game.Configuration;
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using osu.Game.Extensions;
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using osu.Game.Input.Bindings;
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using osu.Game.Models;
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using osu.Game.Online.API;
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using osu.Game.Online.API.Requests.Responses;
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using osu.Game.Rulesets;
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using osu.Game.Rulesets.Mods;
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using osu.Game.Scoring;
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using osu.Game.Scoring.Legacy;
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using osu.Game.Skinning;
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using Realms;
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using Realms.Exceptions;
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namespace osu.Game.Database
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{
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/// <summary>
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/// A factory which provides safe access to the realm storage backend.
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/// </summary>
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public class RealmAccess : IDisposable
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{
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private readonly Storage storage;
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/// <summary>
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/// The filename of this realm.
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/// </summary>
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public readonly string Filename;
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private readonly SynchronizationContext? updateThreadSyncContext;
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/// <summary>
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/// Version history:
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/// 6 ~2021-10-18 First tracked version.
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/// 7 2021-10-18 Changed OnlineID fields to non-nullable to add indexing support.
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/// 8 2021-10-29 Rebind scroll adjust keys to not have control modifier.
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/// 9 2021-11-04 Converted BeatmapMetadata.Author from string to RealmUser.
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/// 10 2021-11-22 Use ShortName instead of RulesetID for ruleset settings.
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/// 11 2021-11-22 Use ShortName instead of RulesetID for ruleset key bindings.
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/// 12 2021-11-24 Add Status to RealmBeatmapSet.
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/// 13 2022-01-13 Final migration of beatmaps and scores to realm (multiple new storage fields).
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/// 14 2022-03-01 Added BeatmapUserSettings to BeatmapInfo.
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/// 15 2022-07-13 Added LastPlayed to BeatmapInfo.
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/// 16 2022-07-15 Removed HasReplay from ScoreInfo.
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/// 17 2022-07-16 Added CountryCode to RealmUser.
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/// 18 2022-07-19 Added OnlineMD5Hash and LastOnlineUpdate to BeatmapInfo.
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/// 19 2022-07-19 Added DateSubmitted and DateRanked to BeatmapSetInfo.
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/// 20 2022-07-21 Added LastAppliedDifficultyVersion to RulesetInfo, changed default value of BeatmapInfo.StarRating to -1.
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/// 21 2022-07-27 Migrate collections to realm (BeatmapCollection).
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/// 22 2022-07-31 Added ModPreset.
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/// 23 2022-08-01 Added LastLocalUpdate to BeatmapInfo.
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/// 24 2022-08-22 Added MaximumStatistics to ScoreInfo.
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/// 25 2022-09-18 Remove skins to add with new naming.
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/// 26 2023-02-05 Added BeatmapHash to ScoreInfo.
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/// 27 2023-06-06 Added EditorTimestamp to BeatmapInfo.
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/// 28 2023-06-08 Added IsLegacyScore to ScoreInfo, parsed from replay files.
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/// 29 2023-06-12 Run migration of old lazer scores to be best-effort in the new scoring number space. No actual realm changes.
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/// 30 2023-06-16 Run migration of old lazer scores again. This time with more correct rounding considerations.
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/// 31 2023-06-26 Add Version and LegacyTotalScore to ScoreInfo, set Version to 30000002 and copy TotalScore into LegacyTotalScore for legacy scores.
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/// 32 2023-07-09 Populate legacy scores with the ScoreV2 mod (and restore TotalScore to the legacy total for such scores) using replay files.
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/// 33 2023-08-16 Reset default chat toggle key binding to avoid conflict with newly added leaderboard toggle key binding.
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/// 34 2023-08-21 Add BackgroundReprocessingFailed flag to ScoreInfo to track upgrade failures.
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/// </summary>
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private const int schema_version = 34;
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/// <summary>
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/// Lock object which is held during <see cref="BlockAllOperations"/> sections, blocking realm retrieval during blocking periods.
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/// </summary>
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private readonly SemaphoreSlim realmRetrievalLock = new SemaphoreSlim(1);
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/// <summary>
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/// <c>true</c> when the current thread has already entered the <see cref="realmRetrievalLock"/>.
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/// </summary>
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private readonly ThreadLocal<bool> currentThreadHasRealmRetrievalLock = new ThreadLocal<bool>();
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/// <summary>
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/// Holds a map of functions registered via <see cref="RegisterCustomSubscription"/> and <see cref="RegisterForNotifications{T}"/> and a coinciding action which when triggered,
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/// will unregister the subscription from realm.
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///
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/// Put another way, the key is an action which registers the subscription with realm. The returned <see cref="IDisposable"/> from the action is stored as the value and only
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/// used internally.
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///
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/// Entries in this dictionary are only removed when a consumer signals that the subscription should be permanently ceased (via their own <see cref="IDisposable"/>).
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/// </summary>
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private readonly Dictionary<Func<Realm, IDisposable?>, IDisposable?> customSubscriptionsResetMap = new Dictionary<Func<Realm, IDisposable?>, IDisposable?>();
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/// <summary>
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/// Holds a map of functions registered via <see cref="RegisterForNotifications{T}"/> and a coinciding action which when triggered,
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/// fires a change set event with an empty collection. This is used to inform subscribers when the main realm instance gets recycled, and ensure they don't use invalidated
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/// managed realm objects from a previous firing.
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/// </summary>
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private readonly Dictionary<Func<Realm, IDisposable?>, Action> notificationsResetMap = new Dictionary<Func<Realm, IDisposable?>, Action>();
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private static readonly GlobalStatistic<int> realm_instances_created = GlobalStatistics.Get<int>(@"Realm", @"Instances (Created)");
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private static readonly GlobalStatistic<int> total_subscriptions = GlobalStatistics.Get<int>(@"Realm", @"Subscriptions");
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private static readonly GlobalStatistic<int> total_reads_update = GlobalStatistics.Get<int>(@"Realm", @"Reads (Update)");
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private static readonly GlobalStatistic<int> total_reads_async = GlobalStatistics.Get<int>(@"Realm", @"Reads (Async)");
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private static readonly GlobalStatistic<int> total_writes_update = GlobalStatistics.Get<int>(@"Realm", @"Writes (Update)");
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private static readonly GlobalStatistic<int> total_writes_async = GlobalStatistics.Get<int>(@"Realm", @"Writes (Async)");
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private Realm? updateRealm;
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/// <summary>
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/// Tracks whether a realm was ever fetched from this instance.
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/// After a fetch occurs, blocking operations will be guaranteed to restore any subscriptions.
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/// </summary>
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private bool hasInitialisedOnce;
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private bool isSendingNotificationResetEvents;
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public Realm Realm => ensureUpdateRealm();
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private const string realm_extension = @".realm";
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private Realm ensureUpdateRealm()
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{
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if (isSendingNotificationResetEvents)
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throw new InvalidOperationException("Cannot retrieve a realm context from a notification callback during a blocking operation.");
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if (!ThreadSafety.IsUpdateThread)
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throw new InvalidOperationException(@$"Use {nameof(getRealmInstance)} when performing realm operations from a non-update thread");
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if (updateRealm == null)
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{
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updateRealm = getRealmInstance();
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hasInitialisedOnce = true;
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Logger.Log(@$"Opened realm ""{updateRealm.Config.DatabasePath}"" at version {updateRealm.Config.SchemaVersion}");
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// Resubscribe any subscriptions
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foreach (var action in customSubscriptionsResetMap.Keys.ToArray())
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registerSubscription(action);
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}
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Debug.Assert(updateRealm != null);
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return updateRealm;
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}
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internal static bool CurrentThreadSubscriptionsAllowed => current_thread_subscriptions_allowed.Value;
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private static readonly ThreadLocal<bool> current_thread_subscriptions_allowed = new ThreadLocal<bool>();
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/// <summary>
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/// Construct a new instance.
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/// </summary>
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/// <param name="storage">The game storage which will be used to create the realm backing file.</param>
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/// <param name="filename">The filename to use for the realm backing file. A ".realm" extension will be added automatically if not specified.</param>
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/// <param name="updateThread">The game update thread, used to post realm operations into a thread-safe context.</param>
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public RealmAccess(Storage storage, string filename, GameThread? updateThread = null)
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{
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this.storage = storage;
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updateThreadSyncContext = updateThread?.SynchronizationContext ?? SynchronizationContext.Current;
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Filename = filename;
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if (!Filename.EndsWith(realm_extension, StringComparison.Ordinal))
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Filename += realm_extension;
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#if DEBUG
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if (!DebugUtils.IsNUnitRunning)
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applyFilenameSchemaSuffix(ref Filename);
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#endif
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// `prepareFirstRealmAccess()` triggers the first `getRealmInstance` call, which will implicitly run realm migrations and bring the schema up-to-date.
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using (var realm = prepareFirstRealmAccess())
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cleanupPendingDeletions(realm);
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}
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/// <summary>
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/// Some developers may be annoyed if a newer version migration (ie. caused by testing a pull request)
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/// cause their test database to be unusable with previous versions.
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/// To get around this, store development databases against their realm version.
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/// Note that this means changes made on newer realm versions will disappear.
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/// </summary>
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private void applyFilenameSchemaSuffix(ref string filename)
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{
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string originalFilename = filename;
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filename = getVersionedFilename(schema_version);
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// First check if the current realm version already exists...
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if (storage.Exists(filename))
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return;
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// Check for a previous version we can use as a base database to migrate from...
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for (int i = schema_version - 1; i >= 0; i--)
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{
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string previousFilename = getVersionedFilename(i);
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if (storage.Exists(previousFilename))
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{
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copyPreviousVersion(previousFilename, filename);
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return;
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}
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}
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// Finally, check for a non-versioned file exists (aka before this method was added)...
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if (storage.Exists(originalFilename))
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copyPreviousVersion(originalFilename, filename);
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void copyPreviousVersion(string previousFilename, string newFilename)
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{
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using (var previous = storage.GetStream(previousFilename))
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using (var current = storage.CreateFileSafely(newFilename))
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{
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Logger.Log(@$"Copying previous realm database {previousFilename} to {newFilename} for migration to schema version {schema_version}");
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previous.CopyTo(current);
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}
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}
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string getVersionedFilename(int version) => originalFilename.Replace(realm_extension, $"_{version}{realm_extension}");
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}
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private void attemptRecoverFromFile(string recoveryFilename)
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{
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Logger.Log($@"Performing recovery from {recoveryFilename}", LoggingTarget.Database);
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// First check the user hasn't started to use the database that is in place..
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try
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{
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using (var realm = Realm.GetInstance(getConfiguration()))
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{
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if (realm.All<ScoreInfo>().Any())
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{
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Logger.Log(@"Recovery aborted as the existing database has scores set already.", LoggingTarget.Database);
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Logger.Log($@"To perform recovery, delete {OsuGameBase.CLIENT_DATABASE_FILENAME} while osu! is not running.", LoggingTarget.Database);
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return;
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}
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}
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}
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catch
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{
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// Even if reading the in place database fails, still attempt to recover.
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}
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// Then check that the database we are about to attempt recovery can actually be recovered on this version..
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try
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{
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using (Realm.GetInstance(getConfiguration(recoveryFilename)))
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{
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// Don't need to do anything, just check that opening the realm works correctly.
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}
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}
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catch
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{
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Logger.Log(@"Recovery aborted as the newer version could not be loaded by this osu! version.", LoggingTarget.Database);
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return;
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}
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// For extra safety, also store the temporarily-used database which we are about to replace.
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createBackup($"{Filename.Replace(realm_extension, string.Empty)}_{DateTimeOffset.UtcNow.ToUnixTimeSeconds()}_newer_version_before_recovery{realm_extension}");
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storage.Delete(Filename);
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using (var inputStream = storage.GetStream(recoveryFilename))
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using (var outputStream = storage.CreateFileSafely(Filename))
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inputStream.CopyTo(outputStream);
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storage.Delete(recoveryFilename);
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Logger.Log(@"Recovery complete!", LoggingTarget.Database);
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}
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private Realm prepareFirstRealmAccess()
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{
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string newerVersionFilename = $"{Filename.Replace(realm_extension, string.Empty)}_newer_version{realm_extension}";
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// Attempt to recover a newer database version if available.
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if (storage.Exists(newerVersionFilename))
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{
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Logger.Log(@"A newer realm database has been found, attempting recovery...", LoggingTarget.Database);
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attemptRecoverFromFile(newerVersionFilename);
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}
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try
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{
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return getRealmInstance();
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}
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catch (Exception e)
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{
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// See https://github.com/realm/realm-core/blob/master/src%2Frealm%2Fobject-store%2Fobject_store.cpp#L1016-L1022
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// This is the best way we can detect a schema version downgrade.
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if (e.Message.StartsWith(@"Provided schema version", StringComparison.Ordinal))
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{
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Logger.Error(e, "Your local database is too new to work with this version of osu!. Please close osu! and install the latest release to recover your data.");
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// If a newer version database already exists, don't backup again. We can presume that the first backup is the one we care about.
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if (!storage.Exists(newerVersionFilename))
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createBackup(newerVersionFilename);
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}
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else
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{
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Logger.Error(e, "Realm startup failed with unrecoverable error; starting with a fresh database. A backup of your database has been made.");
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createBackup($"{Filename.Replace(realm_extension, string.Empty)}_{DateTimeOffset.UtcNow.ToUnixTimeSeconds()}_corrupt{realm_extension}");
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}
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storage.Delete(Filename);
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return getRealmInstance();
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}
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}
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private void cleanupPendingDeletions(Realm realm)
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{
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try
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{
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using (var transaction = realm.BeginWrite())
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{
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var pendingDeleteScores = realm.All<ScoreInfo>().Where(s => s.DeletePending);
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foreach (var score in pendingDeleteScores)
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realm.Remove(score);
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var pendingDeleteSets = realm.All<BeatmapSetInfo>().Where(s => s.DeletePending);
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foreach (var beatmapSet in pendingDeleteSets)
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{
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foreach (var beatmap in beatmapSet.Beatmaps)
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{
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// Cascade delete related scores, else they will have a null beatmap against the model's spec.
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foreach (var score in beatmap.Scores)
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realm.Remove(score);
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realm.Remove(beatmap.Metadata);
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realm.Remove(beatmap);
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}
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realm.Remove(beatmapSet);
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}
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var pendingDeleteSkins = realm.All<SkinInfo>().Where(s => s.DeletePending);
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foreach (var s in pendingDeleteSkins)
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realm.Remove(s);
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var pendingDeletePresets = realm.All<ModPreset>().Where(s => s.DeletePending);
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foreach (var s in pendingDeletePresets)
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realm.Remove(s);
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transaction.Commit();
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}
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// clean up files after dropping any pending deletions.
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// in the future we may want to only do this when the game is idle, rather than on every startup.
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new RealmFileStore(this, storage).Cleanup();
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}
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catch (Exception e)
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{
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Logger.Error(e, "Failed to clean up unused files. This is not critical but please report if it happens regularly.");
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}
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}
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/// <summary>
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/// Compact this realm.
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/// </summary>
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/// <returns></returns>
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public bool Compact()
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{
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try
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{
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return Realm.Compact(getConfiguration());
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}
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// Catch can be removed along with entity framework. Is specifically to allow a failure message to arrive to the user (see similar catches in EFToRealmMigrator).
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catch (AggregateException ae) when (RuntimeInfo.OS == RuntimeInfo.Platform.macOS && ae.Flatten().InnerException is TypeInitializationException)
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{
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return true;
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}
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}
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/// <summary>
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/// Run work on realm with a return value.
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/// </summary>
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/// <param name="action">The work to run.</param>
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/// <typeparam name="T">The return type.</typeparam>
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public T Run<T>(Func<Realm, T> action)
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{
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if (ThreadSafety.IsUpdateThread)
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{
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total_reads_update.Value++;
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return action(Realm);
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}
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total_reads_async.Value++;
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using (var realm = getRealmInstance())
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return action(realm);
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}
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/// <summary>
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/// Run work on realm.
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/// </summary>
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/// <param name="action">The work to run.</param>
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public void Run(Action<Realm> action)
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{
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if (ThreadSafety.IsUpdateThread)
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{
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total_reads_update.Value++;
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action(Realm);
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}
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else
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{
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total_reads_async.Value++;
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using (var realm = getRealmInstance())
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action(realm);
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}
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}
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/// <summary>
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/// Write changes to realm.
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/// </summary>
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/// <param name="action">The work to run.</param>
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public T Write<T>(Func<Realm, T> action)
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{
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if (ThreadSafety.IsUpdateThread)
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{
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total_writes_update.Value++;
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return Realm.Write(action);
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}
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else
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{
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total_writes_async.Value++;
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using (var realm = getRealmInstance())
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return realm.Write(action);
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}
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}
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/// <summary>
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/// Write changes to realm.
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/// </summary>
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/// <param name="action">The work to run.</param>
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public void Write(Action<Realm> action)
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{
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if (ThreadSafety.IsUpdateThread)
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{
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total_writes_update.Value++;
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Realm.Write(action);
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}
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else
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{
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total_writes_async.Value++;
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using (var realm = getRealmInstance())
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realm.Write(action);
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}
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}
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private readonly CountdownEvent pendingAsyncWrites = new CountdownEvent(0);
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/// <summary>
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/// Write changes to realm asynchronously, guaranteeing order of execution.
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/// </summary>
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/// <param name="action">The work to run.</param>
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public Task WriteAsync(Action<Realm> action)
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{
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if (isDisposed)
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throw new ObjectDisposedException(nameof(RealmAccess));
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// Required to ensure the write is tracked and accounted for before disposal.
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// Can potentially be avoided if we have a need to do so in the future.
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if (!ThreadSafety.IsUpdateThread)
|
|
throw new InvalidOperationException(@$"{nameof(WriteAsync)} must be called from the update thread.");
|
|
|
|
// CountdownEvent will fail if already at zero.
|
|
if (!pendingAsyncWrites.TryAddCount())
|
|
pendingAsyncWrites.Reset(1);
|
|
|
|
// Regardless of calling Realm.GetInstance or Realm.GetInstanceAsync, there is a blocking overhead on retrieval.
|
|
// Adding a forced Task.Run resolves this.
|
|
var writeTask = Task.Run(async () =>
|
|
{
|
|
total_writes_async.Value++;
|
|
|
|
// Not attempting to use Realm.GetInstanceAsync as there's seemingly no benefit to us (for now) and it adds complexity due to locking
|
|
// concerns in getRealmInstance(). On a quick check, it looks to be more suited to cases where realm is connecting to an online sync
|
|
// server, which we don't use. May want to report upstream or revisit in the future.
|
|
using (var realm = getRealmInstance())
|
|
// ReSharper disable once AccessToDisposedClosure (WriteAsync should be marked as [InstantHandle]).
|
|
await realm.WriteAsync(() => action(realm)).ConfigureAwait(false);
|
|
|
|
pendingAsyncWrites.Signal();
|
|
});
|
|
|
|
return writeTask;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Subscribe to a realm collection and begin watching for asynchronous changes.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// This adds osu! specific thread and managed state safety checks on top of <see cref="IRealmCollection{T}.SubscribeForNotifications"/>.
|
|
///
|
|
/// In addition to the documented realm behaviour, we have the additional requirement of handling subscriptions over potential realm instance recycle.
|
|
/// When this happens, callback events will be automatically fired:
|
|
/// - On recycle start, a callback with an empty collection and <c>null</c> <see cref="ChangeSet"/> will be invoked.
|
|
/// - On recycle end, a standard initial realm callback will arrive, with <c>null</c> <see cref="ChangeSet"/> and an up-to-date collection.
|
|
/// </remarks>
|
|
/// <param name="query">The <see cref="IQueryable{T}"/> to observe for changes.</param>
|
|
/// <typeparam name="T">Type of the elements in the list.</typeparam>
|
|
/// <param name="callback">The callback to be invoked with the updated <see cref="IRealmCollection{T}"/>.</param>
|
|
/// <returns>
|
|
/// A subscription token. It must be kept alive for as long as you want to receive change notifications.
|
|
/// To stop receiving notifications, call <see cref="IDisposable.Dispose"/>.
|
|
/// </returns>
|
|
/// <seealso cref="IRealmCollection{T}.SubscribeForNotifications"/>
|
|
public IDisposable RegisterForNotifications<T>(Func<Realm, IQueryable<T>> query, NotificationCallbackDelegate<T> callback)
|
|
where T : RealmObjectBase
|
|
{
|
|
Func<Realm, IDisposable?> action = realm => query(realm).QueryAsyncWithNotifications(callback);
|
|
|
|
lock (notificationsResetMap)
|
|
{
|
|
// Store an action which is used when blocking to ensure consumers don't use results of a stale changeset firing.
|
|
notificationsResetMap.Add(action, () => callback(new EmptyRealmSet<T>(), null));
|
|
}
|
|
|
|
return RegisterCustomSubscription(action);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Subscribe to the property of a realm object to watch for changes.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// On subscribing, unless the <paramref name="modelAccessor"/> does not match an object, an initial invocation of <paramref name="onChanged"/> will occur immediately.
|
|
/// Further invocations will occur when the value changes, but may also fire on a realm recycle with no actual value change.
|
|
/// </remarks>
|
|
/// <param name="modelAccessor">A function to retrieve the relevant model from realm.</param>
|
|
/// <param name="propertyLookup">A function to traverse to the relevant property from the model.</param>
|
|
/// <param name="onChanged">A function to be invoked when a change of value occurs.</param>
|
|
/// <typeparam name="TModel">The type of the model.</typeparam>
|
|
/// <typeparam name="TProperty">The type of the property to be watched.</typeparam>
|
|
/// <returns>
|
|
/// A subscription token. It must be kept alive for as long as you want to receive change notifications.
|
|
/// To stop receiving notifications, call <see cref="IDisposable.Dispose"/>.
|
|
/// </returns>
|
|
public IDisposable SubscribeToPropertyChanged<TModel, TProperty>(Func<Realm, TModel?> modelAccessor, Expression<Func<TModel, TProperty>> propertyLookup, Action<TProperty> onChanged)
|
|
where TModel : RealmObjectBase
|
|
{
|
|
return RegisterCustomSubscription(_ =>
|
|
{
|
|
string propertyName = getMemberName(propertyLookup);
|
|
|
|
var model = Run(modelAccessor);
|
|
var propLookupCompiled = propertyLookup.Compile();
|
|
|
|
if (model == null)
|
|
return null;
|
|
|
|
model.PropertyChanged += onPropertyChanged;
|
|
|
|
// Update initial value immediately.
|
|
onChanged(propLookupCompiled(model));
|
|
|
|
return new InvokeOnDisposal(() => model.PropertyChanged -= onPropertyChanged);
|
|
|
|
void onPropertyChanged(object? sender, PropertyChangedEventArgs args)
|
|
{
|
|
if (args.PropertyName == propertyName)
|
|
onChanged(propLookupCompiled(model));
|
|
}
|
|
});
|
|
|
|
static string getMemberName(Expression<Func<TModel, TProperty>> expression)
|
|
{
|
|
if (!(expression is LambdaExpression lambda))
|
|
throw new ArgumentException("Outermost expression must be a lambda expression", nameof(expression));
|
|
|
|
if (!(lambda.Body is MemberExpression memberExpression))
|
|
throw new ArgumentException("Lambda body must be a member access expression", nameof(expression));
|
|
|
|
// TODO: nested access can be supported, with more iteration here
|
|
// (need to iteratively soft-cast `memberExpression.Expression` into `MemberExpression`s until `lambda.Parameters[0]` is hit)
|
|
if (memberExpression.Expression != lambda.Parameters[0])
|
|
throw new ArgumentException("Nested access expressions are not supported", nameof(expression));
|
|
|
|
return memberExpression.Member.Name;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Run work on realm that will be run every time the update thread realm instance gets recycled.
|
|
/// </summary>
|
|
/// <param name="action">The work to run. Return value should be an <see cref="IDisposable"/> from QueryAsyncWithNotifications, or an <see cref="InvokeOnDisposal"/> to clean up any bindings.</param>
|
|
/// <returns>An <see cref="IDisposable"/> which should be disposed to unsubscribe any inner subscription.</returns>
|
|
public IDisposable RegisterCustomSubscription(Func<Realm, IDisposable?> action)
|
|
{
|
|
if (updateThreadSyncContext == null)
|
|
throw new InvalidOperationException("Attempted to register a realm subscription before update thread registration.");
|
|
|
|
total_subscriptions.Value++;
|
|
|
|
if (ThreadSafety.IsUpdateThread)
|
|
updateThreadSyncContext.Send(_ => registerSubscription(action), null);
|
|
else
|
|
updateThreadSyncContext.Post(_ => registerSubscription(action), null);
|
|
|
|
// This token is returned to the consumer.
|
|
// When disposed, it will cause the registration to be permanently ceased (unsubscribed with realm and unregistered by this class).
|
|
return new InvokeOnDisposal(() =>
|
|
{
|
|
if (ThreadSafety.IsUpdateThread)
|
|
updateThreadSyncContext.Send(_ => unsubscribe(), null);
|
|
else
|
|
updateThreadSyncContext.Post(_ => unsubscribe(), null);
|
|
|
|
void unsubscribe()
|
|
{
|
|
if (customSubscriptionsResetMap.TryGetValue(action, out var unsubscriptionAction))
|
|
{
|
|
unsubscriptionAction?.Dispose();
|
|
customSubscriptionsResetMap.Remove(action);
|
|
|
|
lock (notificationsResetMap)
|
|
{
|
|
notificationsResetMap.Remove(action);
|
|
}
|
|
|
|
total_subscriptions.Value--;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
private void registerSubscription(Func<Realm, IDisposable?> action)
|
|
{
|
|
Debug.Assert(ThreadSafety.IsUpdateThread);
|
|
|
|
// Retrieve realm instance outside of flag update to ensure that the instance is retrieved,
|
|
// as attempting to access it inside the subscription if it's not constructed would lead to
|
|
// cyclic invocations of the subscription callback.
|
|
var realm = Realm;
|
|
|
|
Debug.Assert(!customSubscriptionsResetMap.TryGetValue(action, out var found) || found == null);
|
|
|
|
current_thread_subscriptions_allowed.Value = true;
|
|
customSubscriptionsResetMap[action] = action(realm);
|
|
current_thread_subscriptions_allowed.Value = false;
|
|
}
|
|
|
|
private Realm getRealmInstance()
|
|
{
|
|
if (isDisposed)
|
|
throw new ObjectDisposedException(nameof(RealmAccess));
|
|
|
|
bool tookSemaphoreLock = false;
|
|
|
|
try
|
|
{
|
|
// Ensure that the thread that currently has the `realmRetrievalLock` can retrieve nested contexts and not deadlock on itself.
|
|
if (!currentThreadHasRealmRetrievalLock.Value)
|
|
{
|
|
realmRetrievalLock.Wait();
|
|
currentThreadHasRealmRetrievalLock.Value = true;
|
|
tookSemaphoreLock = true;
|
|
}
|
|
else
|
|
{
|
|
// the semaphore is used to handle blocking of all realm retrieval during certain periods.
|
|
// once the semaphore has been taken by this code section, it is safe to retrieve further realm instances on the same thread.
|
|
// this can happen if a realm subscription is active and triggers a callback which has user code that calls `Run`.
|
|
}
|
|
|
|
realm_instances_created.Value++;
|
|
|
|
return Realm.GetInstance(getConfiguration());
|
|
}
|
|
// Catch can be removed along with entity framework. Is specifically to allow a failure message to arrive to the user (see similar catches in EFToRealmMigrator).
|
|
catch (AggregateException ae) when (RuntimeInfo.OS == RuntimeInfo.Platform.macOS && ae.Flatten().InnerException is TypeInitializationException)
|
|
{
|
|
return Realm.GetInstance();
|
|
}
|
|
finally
|
|
{
|
|
if (tookSemaphoreLock)
|
|
{
|
|
realmRetrievalLock.Release();
|
|
currentThreadHasRealmRetrievalLock.Value = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
private RealmConfiguration getConfiguration(string? filename = null)
|
|
{
|
|
// This is currently the only usage of temporary files at the osu! side.
|
|
// If we use the temporary folder in more situations in the future, this should be moved to a higher level (helper method or OsuGameBase).
|
|
string tempPathLocation = Path.Combine(Path.GetTempPath(), @"lazer");
|
|
if (!Directory.Exists(tempPathLocation))
|
|
Directory.CreateDirectory(tempPathLocation);
|
|
|
|
return new RealmConfiguration(storage.GetFullPath(filename ?? Filename, true))
|
|
{
|
|
SchemaVersion = schema_version,
|
|
MigrationCallback = onMigration,
|
|
FallbackPipePath = tempPathLocation,
|
|
};
|
|
}
|
|
|
|
private void onMigration(Migration migration, ulong lastSchemaVersion)
|
|
{
|
|
for (ulong i = lastSchemaVersion + 1; i <= schema_version; i++)
|
|
applyMigrationsForVersion(migration, i);
|
|
}
|
|
|
|
private void applyMigrationsForVersion(Migration migration, ulong targetVersion)
|
|
{
|
|
Logger.Log($"Running realm migration to version {targetVersion}...");
|
|
Stopwatch stopwatch = new Stopwatch();
|
|
|
|
var files = new RealmFileStore(this, storage);
|
|
|
|
stopwatch.Start();
|
|
|
|
switch (targetVersion)
|
|
{
|
|
case 7:
|
|
convertOnlineIDs<BeatmapInfo>();
|
|
convertOnlineIDs<BeatmapSetInfo>();
|
|
convertOnlineIDs<RulesetInfo>();
|
|
|
|
void convertOnlineIDs<T>() where T : RealmObject
|
|
{
|
|
string className = getMappedOrOriginalName(typeof(T));
|
|
|
|
// version was not bumped when the beatmap/ruleset models were added
|
|
// therefore we must manually check for their presence to avoid throwing on the `DynamicApi` calls.
|
|
if (!migration.OldRealm.Schema.TryFindObjectSchema(className, out _))
|
|
return;
|
|
|
|
var oldItems = migration.OldRealm.DynamicApi.All(className);
|
|
var newItems = migration.NewRealm.DynamicApi.All(className);
|
|
|
|
int itemCount = newItems.Count();
|
|
|
|
for (int i = 0; i < itemCount; i++)
|
|
{
|
|
dynamic oldItem = oldItems.ElementAt(i);
|
|
dynamic newItem = newItems.ElementAt(i);
|
|
|
|
long? nullableOnlineID = oldItem.OnlineID;
|
|
newItem.OnlineID = (int)(nullableOnlineID ?? -1);
|
|
}
|
|
}
|
|
|
|
break;
|
|
|
|
case 8:
|
|
{
|
|
// Ctrl -/+ now adjusts UI scale so let's clear any bindings which overlap these combinations.
|
|
// New defaults will be populated by the key store afterwards.
|
|
var keyBindings = migration.NewRealm.All<RealmKeyBinding>();
|
|
|
|
var increaseSpeedBinding = keyBindings.FirstOrDefault(k => k.ActionInt == (int)GlobalAction.IncreaseScrollSpeed);
|
|
if (increaseSpeedBinding != null && increaseSpeedBinding.KeyCombination.Keys.SequenceEqual(new[] { InputKey.Control, InputKey.Plus }))
|
|
migration.NewRealm.Remove(increaseSpeedBinding);
|
|
|
|
var decreaseSpeedBinding = keyBindings.FirstOrDefault(k => k.ActionInt == (int)GlobalAction.DecreaseScrollSpeed);
|
|
if (decreaseSpeedBinding != null && decreaseSpeedBinding.KeyCombination.Keys.SequenceEqual(new[] { InputKey.Control, InputKey.Minus }))
|
|
migration.NewRealm.Remove(decreaseSpeedBinding);
|
|
|
|
break;
|
|
}
|
|
|
|
case 9:
|
|
// Pretty pointless to do this as beatmaps aren't really loaded via realm yet, but oh well.
|
|
string metadataClassName = getMappedOrOriginalName(typeof(BeatmapMetadata));
|
|
|
|
// May be coming from a version before `RealmBeatmapMetadata` existed.
|
|
if (!migration.OldRealm.Schema.TryFindObjectSchema(metadataClassName, out _))
|
|
return;
|
|
|
|
var oldMetadata = migration.OldRealm.DynamicApi.All(metadataClassName);
|
|
var newMetadata = migration.NewRealm.All<BeatmapMetadata>();
|
|
|
|
int metadataCount = newMetadata.Count();
|
|
|
|
for (int i = 0; i < metadataCount; i++)
|
|
{
|
|
dynamic oldItem = oldMetadata.ElementAt(i);
|
|
var newItem = newMetadata.ElementAt(i);
|
|
|
|
string username = oldItem.Author;
|
|
newItem.Author = new RealmUser
|
|
{
|
|
Username = username
|
|
};
|
|
}
|
|
|
|
break;
|
|
|
|
case 10:
|
|
string rulesetSettingClassName = getMappedOrOriginalName(typeof(RealmRulesetSetting));
|
|
|
|
if (!migration.OldRealm.Schema.TryFindObjectSchema(rulesetSettingClassName, out _))
|
|
return;
|
|
|
|
var oldSettings = migration.OldRealm.DynamicApi.All(rulesetSettingClassName);
|
|
var newSettings = migration.NewRealm.All<RealmRulesetSetting>().ToList();
|
|
|
|
for (int i = 0; i < newSettings.Count; i++)
|
|
{
|
|
dynamic oldItem = oldSettings.ElementAt(i);
|
|
var newItem = newSettings.ElementAt(i);
|
|
|
|
long rulesetId = oldItem.RulesetID;
|
|
string? rulesetName = getRulesetShortNameFromLegacyID(rulesetId);
|
|
|
|
if (string.IsNullOrEmpty(rulesetName))
|
|
migration.NewRealm.Remove(newItem);
|
|
else
|
|
newItem.RulesetName = rulesetName;
|
|
}
|
|
|
|
break;
|
|
|
|
case 11:
|
|
{
|
|
string keyBindingClassName = getMappedOrOriginalName(typeof(RealmKeyBinding));
|
|
|
|
if (!migration.OldRealm.Schema.TryFindObjectSchema(keyBindingClassName, out _))
|
|
return;
|
|
|
|
var oldKeyBindings = migration.OldRealm.DynamicApi.All(keyBindingClassName);
|
|
var newKeyBindings = migration.NewRealm.All<RealmKeyBinding>().ToList();
|
|
|
|
for (int i = 0; i < newKeyBindings.Count; i++)
|
|
{
|
|
dynamic oldItem = oldKeyBindings.ElementAt(i);
|
|
var newItem = newKeyBindings.ElementAt(i);
|
|
|
|
if (oldItem.RulesetID == null)
|
|
continue;
|
|
|
|
long rulesetId = oldItem.RulesetID;
|
|
string? rulesetName = getRulesetShortNameFromLegacyID(rulesetId);
|
|
|
|
if (string.IsNullOrEmpty(rulesetName))
|
|
migration.NewRealm.Remove(newItem);
|
|
else
|
|
newItem.RulesetName = rulesetName;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case 14:
|
|
foreach (var beatmap in migration.NewRealm.All<BeatmapInfo>())
|
|
beatmap.UserSettings = new BeatmapUserSettings();
|
|
|
|
break;
|
|
|
|
case 20:
|
|
// As we now have versioned difficulty calculations, let's reset
|
|
// all star ratings and have `BackgroundBeatmapProcessor` recalculate them.
|
|
foreach (var beatmap in migration.NewRealm.All<BeatmapInfo>())
|
|
beatmap.StarRating = -1;
|
|
|
|
break;
|
|
|
|
case 21:
|
|
// Migrate collections from external file to inside realm.
|
|
// We use the "legacy" importer because that is how things were actually being saved out until now.
|
|
var legacyCollectionImporter = new LegacyCollectionImporter(this);
|
|
|
|
if (legacyCollectionImporter.GetAvailableCount(storage).GetResultSafely() > 0)
|
|
{
|
|
legacyCollectionImporter.ImportFromStorage(storage).ContinueWith(_ => storage.Move("collection.db", "collection.db.migrated"));
|
|
}
|
|
|
|
break;
|
|
|
|
case 25:
|
|
// Remove the default skins so they can be added back by SkinManager with updated naming.
|
|
migration.NewRealm.RemoveRange(migration.NewRealm.All<SkinInfo>().Where(s => s.Protected));
|
|
break;
|
|
|
|
case 26:
|
|
{
|
|
// Add ScoreInfo.BeatmapHash property to ensure scores correspond to the correct version of beatmap.
|
|
var scores = migration.NewRealm.All<ScoreInfo>();
|
|
|
|
foreach (var score in scores)
|
|
score.BeatmapHash = score.BeatmapInfo?.Hash ?? string.Empty;
|
|
|
|
break;
|
|
}
|
|
|
|
case 28:
|
|
{
|
|
var scores = migration.NewRealm.All<ScoreInfo>();
|
|
|
|
foreach (var score in scores)
|
|
{
|
|
score.PopulateFromReplay(files, sr =>
|
|
{
|
|
sr.ReadByte(); // Ruleset.
|
|
int version = sr.ReadInt32();
|
|
if (version < LegacyScoreEncoder.FIRST_LAZER_VERSION)
|
|
score.IsLegacyScore = true;
|
|
});
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case 29:
|
|
case 30:
|
|
{
|
|
var scores = migration.NewRealm
|
|
.All<ScoreInfo>()
|
|
.Where(s => !s.IsLegacyScore);
|
|
|
|
foreach (var score in scores)
|
|
{
|
|
try
|
|
{
|
|
if (StandardisedScoreMigrationTools.ShouldMigrateToNewStandardised(score))
|
|
{
|
|
try
|
|
{
|
|
long calculatedNew = StandardisedScoreMigrationTools.GetNewStandardised(score);
|
|
score.TotalScore = calculatedNew;
|
|
}
|
|
catch
|
|
{
|
|
}
|
|
}
|
|
}
|
|
catch { }
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case 31:
|
|
{
|
|
foreach (var score in migration.NewRealm.All<ScoreInfo>())
|
|
{
|
|
if (score.IsLegacyScore && score.Ruleset.IsLegacyRuleset())
|
|
{
|
|
// Scores with this version will trigger the score upgrade process in BackgroundBeatmapProcessor.
|
|
score.TotalScoreVersion = 30000002;
|
|
|
|
// Transfer known legacy scores to a permanent storage field for preservation.
|
|
score.LegacyTotalScore = score.TotalScore;
|
|
}
|
|
else
|
|
score.TotalScoreVersion = LegacyScoreEncoder.LATEST_VERSION;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case 32:
|
|
{
|
|
foreach (var score in migration.NewRealm.All<ScoreInfo>())
|
|
{
|
|
if (!score.IsLegacyScore || !score.Ruleset.IsLegacyRuleset())
|
|
continue;
|
|
|
|
score.PopulateFromReplay(files, sr =>
|
|
{
|
|
sr.ReadByte(); // Ruleset.
|
|
sr.ReadInt32(); // Version.
|
|
sr.ReadString(); // Beatmap hash.
|
|
sr.ReadString(); // Username.
|
|
sr.ReadString(); // MD5Hash.
|
|
sr.ReadUInt16(); // Count300.
|
|
sr.ReadUInt16(); // Count100.
|
|
sr.ReadUInt16(); // Count50.
|
|
sr.ReadUInt16(); // CountGeki.
|
|
sr.ReadUInt16(); // CountKatu.
|
|
sr.ReadUInt16(); // CountMiss.
|
|
|
|
// we should have this in LegacyTotalScore already, but if we're reading through this anyways...
|
|
int totalScore = sr.ReadInt32();
|
|
|
|
sr.ReadUInt16(); // Max combo.
|
|
sr.ReadBoolean(); // Perfect.
|
|
|
|
var legacyMods = (LegacyMods)sr.ReadInt32();
|
|
|
|
if (!legacyMods.HasFlagFast(LegacyMods.ScoreV2) || score.APIMods.Any(mod => mod.Acronym == @"SV2"))
|
|
return;
|
|
|
|
score.APIMods = score.APIMods.Append(new APIMod(new ModScoreV2())).ToArray();
|
|
score.LegacyTotalScore = score.TotalScore = totalScore;
|
|
});
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case 33:
|
|
{
|
|
// Clear default bindings for the chat focus toggle,
|
|
// as they would conflict with the newly-added leaderboard toggle.
|
|
var keyBindings = migration.NewRealm.All<RealmKeyBinding>();
|
|
|
|
var toggleChatBind = keyBindings.FirstOrDefault(bind => bind.ActionInt == (int)GlobalAction.ToggleChatFocus);
|
|
if (toggleChatBind != null && toggleChatBind.KeyCombination.Keys.SequenceEqual(new[] { InputKey.Tab }))
|
|
migration.NewRealm.Remove(toggleChatBind);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
Logger.Log($"Migration completed in {stopwatch.ElapsedMilliseconds}ms");
|
|
}
|
|
|
|
private string? getRulesetShortNameFromLegacyID(long rulesetId)
|
|
{
|
|
try
|
|
{
|
|
return new APIBeatmap.APIRuleset { OnlineID = (int)rulesetId }.ShortName;
|
|
}
|
|
catch
|
|
{
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Create a full realm backup.
|
|
/// </summary>
|
|
/// <param name="backupFilename">The filename for the backup.</param>
|
|
public void CreateBackup(string backupFilename)
|
|
{
|
|
if (realmRetrievalLock.CurrentCount != 0)
|
|
throw new InvalidOperationException($"Call {nameof(BlockAllOperations)} before creating a backup.");
|
|
|
|
createBackup(backupFilename);
|
|
}
|
|
|
|
private void createBackup(string backupFilename)
|
|
{
|
|
Logger.Log($"Creating full realm database backup at {backupFilename}", LoggingTarget.Database);
|
|
|
|
int attempts = 10;
|
|
|
|
while (true)
|
|
{
|
|
try
|
|
{
|
|
using (var source = storage.GetStream(Filename, mode: FileMode.Open))
|
|
{
|
|
// source may not exist.
|
|
if (source == null)
|
|
return;
|
|
|
|
using (var destination = storage.GetStream(backupFilename, FileAccess.Write, FileMode.CreateNew))
|
|
source.CopyTo(destination);
|
|
}
|
|
|
|
return;
|
|
}
|
|
catch (IOException)
|
|
{
|
|
if (attempts-- <= 0)
|
|
throw;
|
|
|
|
// file may be locked during use.
|
|
Thread.Sleep(500);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// Flush any active realm instances and block any further writes.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// This should be used in places we need to ensure no ongoing reads/writes are occurring with realm.
|
|
/// ie. to move the realm backing file to a new location.
|
|
/// </remarks>
|
|
/// <param name="reason">The reason for blocking. Used for logging purposes.</param>
|
|
/// <returns>An <see cref="IDisposable"/> which should be disposed to end the blocking section.</returns>
|
|
public IDisposable BlockAllOperations(string reason)
|
|
{
|
|
Logger.Log($@"Attempting to block all realm operations for {reason}.", LoggingTarget.Database);
|
|
|
|
if (!ThreadSafety.IsUpdateThread)
|
|
throw new InvalidOperationException(@$"{nameof(BlockAllOperations)} must be called from the update thread.");
|
|
|
|
if (isDisposed)
|
|
throw new ObjectDisposedException(nameof(RealmAccess));
|
|
|
|
SynchronizationContext? syncContext = null;
|
|
|
|
try
|
|
{
|
|
realmRetrievalLock.Wait();
|
|
|
|
if (hasInitialisedOnce)
|
|
{
|
|
syncContext = SynchronizationContext.Current;
|
|
|
|
// Before disposing the update context, clean up all subscriptions.
|
|
// Note that in the case of realm notification subscriptions, this is not really required (they will be cleaned up by disposal).
|
|
// In the case of custom subscriptions, we want them to fire before the update realm is disposed in case they do any follow-up work.
|
|
foreach (var action in customSubscriptionsResetMap.ToArray())
|
|
{
|
|
action.Value?.Dispose();
|
|
customSubscriptionsResetMap[action.Key] = null;
|
|
}
|
|
|
|
updateRealm?.Dispose();
|
|
updateRealm = null;
|
|
}
|
|
|
|
Logger.Log(@"Lock acquired for blocking operations", LoggingTarget.Database);
|
|
|
|
const int sleep_length = 200;
|
|
int timeSpent = 0;
|
|
|
|
try
|
|
{
|
|
// see https://github.com/realm/realm-dotnet/discussions/2657
|
|
while (!Compact())
|
|
{
|
|
Thread.Sleep(sleep_length);
|
|
timeSpent += sleep_length;
|
|
|
|
if (timeSpent > 5000)
|
|
throw new TimeoutException($@"Realm compact failed after {timeSpent / sleep_length} attempts over {timeSpent / 1000} seconds");
|
|
}
|
|
}
|
|
catch (RealmException e)
|
|
{
|
|
// Compact may fail if the realm is in a bad state.
|
|
// We still want to continue with the blocking operation, though.
|
|
Logger.Log($"Realm compact failed with error {e}", LoggingTarget.Database);
|
|
}
|
|
|
|
Logger.Log(@"Realm usage isolated via compact", LoggingTarget.Database);
|
|
|
|
// In order to ensure events arrive in the correct order, these *must* be fired post disposal of the update realm,
|
|
// and must be posted to the synchronization context.
|
|
// This is because realm may fire event callbacks between the `unregisterAllSubscriptions` and `updateRealm.Dispose`
|
|
// calls above.
|
|
syncContext?.Send(_ =>
|
|
{
|
|
// Flag ensures that we don't get in a deadlocked scenario due to a callback attempting to access `RealmAccess.Realm` or `RealmAccess.Run`
|
|
// and hitting `realmRetrievalLock` a second time. Generally such usages should not exist, and as such we throw when an attempt is made
|
|
// to use in this fashion.
|
|
isSendingNotificationResetEvents = true;
|
|
|
|
try
|
|
{
|
|
lock (notificationsResetMap)
|
|
{
|
|
foreach (var action in notificationsResetMap.Values)
|
|
action();
|
|
}
|
|
}
|
|
finally
|
|
{
|
|
isSendingNotificationResetEvents = false;
|
|
}
|
|
}, null);
|
|
}
|
|
catch
|
|
{
|
|
restoreOperation();
|
|
throw;
|
|
}
|
|
|
|
return new InvokeOnDisposal(restoreOperation);
|
|
|
|
void restoreOperation()
|
|
{
|
|
// Release of lock needs to happen here rather than on the update thread, as there may be another
|
|
// operation already blocking the update thread waiting for the blocking operation to complete.
|
|
Logger.Log(@"Restoring realm operations.", LoggingTarget.Database);
|
|
realmRetrievalLock.Release();
|
|
|
|
if (syncContext == null) return;
|
|
|
|
ManualResetEventSlim updateRealmReestablished = new ManualResetEventSlim();
|
|
|
|
// Post back to the update thread to revive any subscriptions.
|
|
// In the case we are on the update thread, let's also require this to run synchronously.
|
|
// This requirement is mostly due to test coverage, but shouldn't cause any harm.
|
|
if (ThreadSafety.IsUpdateThread)
|
|
{
|
|
syncContext.Send(_ =>
|
|
{
|
|
ensureUpdateRealm();
|
|
updateRealmReestablished.Set();
|
|
}, null);
|
|
}
|
|
else
|
|
{
|
|
syncContext.Post(_ =>
|
|
{
|
|
ensureUpdateRealm();
|
|
updateRealmReestablished.Set();
|
|
}, null);
|
|
}
|
|
|
|
// Wait for the post to complete to ensure a second `Migrate` operation doesn't start in the mean time.
|
|
// This is important to ensure `ensureUpdateRealm` is run before another blocking migration operation starts.
|
|
if (!updateRealmReestablished.Wait(10000))
|
|
throw new TimeoutException(@"Reestablishing update realm after block took too long");
|
|
}
|
|
}
|
|
|
|
// https://github.com/realm/realm-dotnet/blob/32f4ebcc88b3e80a3b254412665340cd9f3bd6b5/Realm/Realm/Extensions/ReflectionExtensions.cs#L46
|
|
private static string getMappedOrOriginalName(MemberInfo member) => member.GetCustomAttribute<MapToAttribute>()?.Mapping ?? member.Name;
|
|
|
|
private bool isDisposed;
|
|
|
|
public void Dispose()
|
|
{
|
|
if (!pendingAsyncWrites.Wait(10000))
|
|
Logger.Log("Realm took too long waiting on pending async writes", level: LogLevel.Error);
|
|
|
|
updateRealm?.Dispose();
|
|
|
|
if (!isDisposed)
|
|
{
|
|
// intentionally block realm retrieval indefinitely. this ensures that nothing can start consuming a new instance after disposal.
|
|
realmRetrievalLock.Wait();
|
|
realmRetrievalLock.Dispose();
|
|
|
|
isDisposed = true;
|
|
}
|
|
}
|
|
}
|
|
}
|