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

100 lines
3.5 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.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using osu.Framework.Extensions.ObjectExtensions;
using osu.Framework.Logging;
using osu.Framework.Platform;
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 BeatmapOnlineLookupQueue onlineLookupQueue;
private readonly BeatmapDifficultyCache difficultyCache;
public BeatmapUpdater(IWorkingBeatmapCache workingBeatmapCache, BeatmapDifficultyCache difficultyCache, IAPIProvider api, Storage storage)
{
this.workingBeatmapCache = workingBeatmapCache;
this.difficultyCache = difficultyCache;
onlineLookupQueue = new BeatmapOnlineLookupQueue(api, storage);
}
/// <summary>
/// Queue a beatmap for background processing.
/// </summary>
public void Queue(Live<BeatmapSetInfo> beatmap)
{
Logger.Log($"Queueing change for local beatmap {beatmap}");
Task.Factory.StartNew(() => beatmap.PerformRead(Process));
}
/// <summary>
/// Run all processing on a beatmap immediately.
/// </summary>
public void Process(BeatmapSetInfo beatmapSet) => beatmapSet.Realm.Write(r =>
{
// Before we use below, we want to invalidate.
workingBeatmapCache.Invalidate(beatmapSet);
// TODO: this call currently uses the local `online.db` lookup.
// We probably don't want this to happen after initial import (as the data may be stale).
onlineLookupQueue.Update(beatmapSet);
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 (onlineLookupQueue.IsNotNull())
onlineLookupQueue.Dispose();
}
#endregion
}
}