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osu-lazer/osu.Game/Beatmaps/BeatmapUpdater.cs

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// 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.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using osu.Framework.Extensions.ObjectExtensions;
using osu.Framework.Logging;
using osu.Framework.Platform;
using osu.Framework.Threading;
using osu.Game.Database;
using osu.Game.Online.API;
using osu.Game.Rulesets.Objects;
namespace osu.Game.Beatmaps
{
/// <summary>
/// Handles all processing required to ensure a local beatmap is in a consistent state with any changes.
/// </summary>
public class BeatmapUpdater : IDisposable
{
private readonly IWorkingBeatmapCache workingBeatmapCache;
private readonly BeatmapDifficultyCache difficultyCache;
private readonly BeatmapUpdaterMetadataLookup metadataLookup;
private const int update_queue_request_concurrency = 4;
private readonly ThreadedTaskScheduler updateScheduler = new ThreadedTaskScheduler(update_queue_request_concurrency, nameof(BeatmapUpdaterMetadataLookup));
public BeatmapUpdater(IWorkingBeatmapCache workingBeatmapCache, BeatmapDifficultyCache difficultyCache, IAPIProvider api, Storage storage)
{
this.workingBeatmapCache = workingBeatmapCache;
this.difficultyCache = difficultyCache;
metadataLookup = new BeatmapUpdaterMetadataLookup(api, storage);
}
/// <summary>
/// Queue a beatmap for background processing.
/// </summary>
/// <param name="beatmapSet">The managed beatmap set to update. A transaction will be opened to apply changes.</param>
/// <param name="preferOnlineFetch">Whether metadata from an online source should be preferred. If <c>true</c>, the local cache will be skipped to ensure the freshest data state possible.</param>
public void Queue(Live<BeatmapSetInfo> beatmapSet, bool preferOnlineFetch = false)
{
Logger.Log($"Queueing change for local beatmap {beatmapSet}");
Task.Factory.StartNew(() => beatmapSet.PerformRead(b => Process(b, preferOnlineFetch)), default, TaskCreationOptions.HideScheduler | TaskCreationOptions.RunContinuationsAsynchronously, updateScheduler);
}
/// <summary>
/// Run all processing on a beatmap immediately.
/// </summary>
/// <param name="beatmapSet">The managed beatmap set to update. A transaction will be opened to apply changes.</param>
/// <param name="preferOnlineFetch">Whether metadata from an online source should be preferred. If <c>true</c>, the local cache will be skipped to ensure the freshest data state possible.</param>
public void Process(BeatmapSetInfo beatmapSet, bool preferOnlineFetch = false) => beatmapSet.Realm.Write(r =>
{
// Before we use below, we want to invalidate.
workingBeatmapCache.Invalidate(beatmapSet);
metadataLookup.Update(beatmapSet, preferOnlineFetch);
foreach (var beatmap in beatmapSet.Beatmaps)
{
difficultyCache.Invalidate(beatmap);
var working = workingBeatmapCache.GetWorkingBeatmap(beatmap);
var ruleset = working.BeatmapInfo.Ruleset.CreateInstance();
Debug.Assert(ruleset != null);
var calculator = ruleset.CreateDifficultyCalculator(working);
beatmap.StarRating = calculator.Calculate().StarRating;
beatmap.Length = calculateLength(working.Beatmap);
beatmap.BPM = 60000 / working.Beatmap.GetMostCommonBeatLength();
}
// And invalidate again afterwards as re-fetching the most up-to-date database metadata will be required.
workingBeatmapCache.Invalidate(beatmapSet);
});
private double calculateLength(IBeatmap b)
{
if (!b.HitObjects.Any())
return 0;
var lastObject = b.HitObjects.Last();
//TODO: this isn't always correct (consider mania where a non-last object may last for longer than the last in the list).
double endTime = lastObject.GetEndTime();
double startTime = b.HitObjects.First().StartTime;
return endTime - startTime;
}
#region Implementation of IDisposable
public void Dispose()
{
if (metadataLookup.IsNotNull())
metadataLookup.Dispose();
if (updateScheduler.IsNotNull())
updateScheduler.Dispose();
}
#endregion
}
}