osu/osu.Game/Skinning/RealmBackedResourceStore.cs

79 lines
2.6 KiB
C#

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using osu.Framework.Extensions;
using osu.Framework.IO.Stores;
using osu.Game.Database;
using osu.Game.Extensions;
using Realms;
namespace osu.Game.Skinning
{
public class RealmBackedResourceStore<T> : ResourceStore<byte[]>
where T : RealmObject, IHasRealmFiles, IHasGuidPrimaryKey
{
private Lazy<Dictionary<string, string>> fileToStoragePathMapping;
private readonly Live<T> liveSource;
private readonly IDisposable? realmSubscription;
public RealmBackedResourceStore(Live<T> source, IResourceStore<byte[]> underlyingStore, RealmAccess? realm)
: base(underlyingStore)
{
liveSource = source;
invalidateCache();
Debug.Assert(fileToStoragePathMapping != null);
// Required local for iOS. Will cause runtime crash if inlined.
Guid id = source.ID;
realmSubscription = realm?.RegisterForNotifications(r => r.All<T>().Where(s => s.ID == id), skinChanged);
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
realmSubscription?.Dispose();
}
private void skinChanged(IRealmCollection<T> sender, ChangeSet? changes) => invalidateCache();
protected override IEnumerable<string> GetFilenames(string name)
{
foreach (string filename in base.GetFilenames(name))
{
string? path = getPathForFile(filename.ToStandardisedPath());
if (path != null)
yield return path;
}
}
private string? getPathForFile(string filename)
{
if (fileToStoragePathMapping.Value.TryGetValue(filename.ToLowerInvariant(), out string? path))
return path;
return null;
}
private void invalidateCache() => fileToStoragePathMapping = new Lazy<Dictionary<string, string>>(initialiseFileCache);
private Dictionary<string, string> initialiseFileCache() => liveSource.PerformRead(source =>
{
var dictionary = new Dictionary<string, string>();
dictionary.Clear();
foreach (var f in source.Files)
dictionary[f.Filename.ToLowerInvariant()] = f.File.GetStoragePath();
return dictionary;
});
public override IEnumerable<string> GetAvailableResources() => fileToStoragePathMapping.Value.Keys;
}
}