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Code Issues Releases Wiki Activity

Simplify tracking of beatmap sets in BeatmapCarousel

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Dean Herbert 2024-07-08 18:31:36 +09:00
parent e51d510ea3
commit 151c448535
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1 changed files with 19 additions and 54 deletions
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73
osu.Game/Screens/Select/BeatmapCarousel.cs
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@ -197,7 +197,6 @@ namespace osu.Game.Screens.Select
private CarouselRoot root;
private IDisposable? subscriptionSets;
private IDisposable? subscriptionDeletedSets;
private IDisposable? subscriptionBeatmaps;
private IDisposable? subscriptionHiddenBeatmaps;
@ -253,6 +252,11 @@ namespace osu.Game.Screens.Select
[Resolved]
private RealmAccess realm { get; set; } = null!;
/// <summary>
/// Track GUIDs of all sets in realm to allow handling deletions.
/// </summary>
private readonly List<Guid> realmBeatmapSets = new List<Guid>();
protected override void LoadComplete()
{
base.LoadComplete();
@ -262,45 +266,9 @@ namespace osu.Game.Screens.Select
// Can't use main subscriptions because we can't lookup deleted indices.
// https://github.com/realm/realm-dotnet/discussions/2634#discussioncomment-1605595.
subscriptionDeletedSets = realm.RegisterForNotifications(r => r.All<BeatmapSetInfo>().Where(s => s.DeletePending && !s.Protected), deletedBeatmapSetsChanged);
subscriptionHiddenBeatmaps = realm.RegisterForNotifications(r => r.All<BeatmapInfo>().Where(b => b.Hidden), beatmapsChanged);
}
private void deletedBeatmapSetsChanged(IRealmCollection<BeatmapSetInfo> sender, ChangeSet? changes)
{
// If loading test beatmaps, avoid overwriting with realm subscription callbacks.
if (loadedTestBeatmaps)
return;
if (changes == null)
return;
var removeableSets = changes.InsertedIndices.Select(i => sender[i].ID).ToHashSet();
// This schedule is required to retain selection of beatmaps over an ImportAsUpdate operation.
// This is covered by TestPlaySongSelect.TestSelectionRetainedOnBeatmapUpdate.
//
// In short, we have specialised logic in `beatmapSetsChanged` (directly below) to infer that an
// update operation has occurred. For this to work, we need to confirm the `DeletePending` flag
// of the current selection.
//
// If we don't schedule the following code, it is possible for the `deleteBeatmapSetsChanged` handler
// to be invoked before the `beatmapSetsChanged` handler (realm call order seems non-deterministic)
// which will lead to the currently selected beatmap changing via `CarouselGroupEagerSelect`.
//
// We need a better path forward here. A few ideas:
// - Avoid the necessity of having realm subscriptions on deleted/hidden items, maybe by storing all guids in realm
// to a local list so we can better look them up on receiving `DeletedIndices`.
// - Add a new property on `BeatmapSetInfo` to link to the pre-update set, and use that to handle the update case.
Schedule(() =>
{
foreach (var set in removeableSets)
removeBeatmapSet(set);
invalidateAfterChange();
});
}
private void beatmapSetsChanged(IRealmCollection<BeatmapSetInfo> sender, ChangeSet? changes)
{
// If loading test beatmaps, avoid overwriting with realm subscription callbacks.
@ -312,32 +280,30 @@ namespace osu.Game.Screens.Select
if (changes == null)
{
// During initial population, we must manually account for the fact that our original query was done on an async thread.
// Since then, there may have been imports or deletions.
// Here we manually catch up on any changes.
var realmSets = new HashSet<Guid>();
realmBeatmapSets.Clear();
realmBeatmapSets.AddRange(sender.Select(r => r.ID));
for (int i = 0; i < sender.Count; i++)
realmSets.Add(sender[i].ID);
foreach (var id in realmSets)
foreach (var id in realmBeatmapSets)
{
if (!root.BeatmapSetsByID.ContainsKey(id))
setsRequiringUpdate.Add(realm.Realm.Find<BeatmapSetInfo>(id)!.Detach());
}
foreach (var id in root.BeatmapSetsByID.Keys)
{
if (!realmSets.Contains(id))
setsRequiringRemoval.Add(id);
}
}
else
{
foreach (int i in changes.NewModifiedIndices)
setsRequiringUpdate.Add(sender[i].Detach());
foreach (int i in changes.DeletedIndices.OrderDescending())
{
setsRequiringRemoval.Add(realmBeatmapSets[i]);
realmBeatmapSets.RemoveAt(i);
}
foreach (int i in changes.InsertedIndices)
{
realmBeatmapSets.Insert(i, sender[i].ID);
setsRequiringUpdate.Add(sender[i].Detach());
}
foreach (int i in changes.NewModifiedIndices)
setsRequiringUpdate.Add(sender[i].Detach());
}
@ -1312,7 +1278,6 @@ namespace osu.Game.Screens.Select
base.Dispose(isDisposing);
subscriptionSets?.Dispose();
subscriptionDeletedSets?.Dispose();
subscriptionBeatmaps?.Dispose();
subscriptionHiddenBeatmaps?.Dispose();
}