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osu-lazer/osu.Game/Database/ModelManager.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.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using osu.Framework.Platform;
using osu.Game.Beatmaps;
using osu.Game.Extensions;
using osu.Game.Models;
using osu.Game.Overlays.Notifications;
using Realms;
namespace osu.Game.Database
{
public class ModelManager<TModel> : IModelManager<TModel>, IModelFileManager<TModel, RealmNamedFileUsage>
where TModel : RealmObject, IHasRealmFiles, IHasGuidPrimaryKey, ISoftDelete
{
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/// <summary>
/// Temporarily pause imports to avoid performance overheads affecting gameplay scenarios.
/// </summary>
public virtual bool PauseImports { get; set; }
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protected RealmAccess Realm { get; }
private readonly RealmFileStore realmFileStore;
public ModelManager(Storage storage, RealmAccess realm)
{
realmFileStore = new RealmFileStore(realm, storage);
Realm = realm;
}
public void DeleteFile(TModel item, RealmNamedFileUsage file) =>
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performFileOperation(item, managed => DeleteFile(managed, managed.Files.First(f => f.Filename == file.Filename), managed.Realm!));
public void ReplaceFile(TModel item, RealmNamedFileUsage file, Stream contents) =>
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performFileOperation(item, managed => ReplaceFile(file, contents, managed.Realm!));
public void AddFile(TModel item, Stream contents, string filename) =>
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performFileOperation(item, managed => AddFile(managed, contents, filename, managed.Realm!));
private void performFileOperation(TModel item, Action<TModel> operation)
{
// While we are detaching so often, this seems like the easiest way to keep things in sync.
// This method should be removed as soon as all the surrounding pieces support non-detached operations.
if (!item.IsManaged)
{
// Importantly, begin the realm write *before* re-fetching, else the update realm may not be in a consistent state
// (ie. if an async import finished very recently).
Realm.Realm.Write(realm =>
{
var managed = realm.FindWithRefresh<TModel>(item.ID);
Debug.Assert(managed != null);
operation(managed);
item.Files.Clear();
item.Files.AddRange(managed.Files.Detach());
});
}
else
operation(item);
}
/// <summary>
/// Delete a file from within an ongoing realm transaction.
/// </summary>
public void DeleteFile(TModel item, RealmNamedFileUsage file, Realm realm)
{
item.Files.Remove(file);
}
/// <summary>
/// Replace a file from within an ongoing realm transaction.
/// </summary>
public void ReplaceFile(RealmNamedFileUsage file, Stream contents, Realm realm)
{
file.File = realmFileStore.Add(contents, realm);
}
/// <summary>
/// Add a file from within an ongoing realm transaction. If the file already exists, it is overwritten.
/// </summary>
public void AddFile(TModel item, Stream contents, string filename, Realm realm)
{
var existing = item.GetFile(filename);
if (existing != null)
{
ReplaceFile(existing, contents, realm);
return;
}
var file = realmFileStore.Add(contents, realm);
var namedUsage = new RealmNamedFileUsage(file, filename);
item.Files.Add(namedUsage);
}
/// <summary>
/// Delete multiple items.
/// This will post notifications tracking progress.
/// </summary>
public void Delete(List<TModel> items, bool silent = false)
{
if (items.Count == 0)
{
if (!silent)
PostNotification?.Invoke(new ProgressCompletionNotification { Text = $"No {HumanisedModelName}s found to delete!" });
return;
}
var notification = new ProgressNotification
{
Progress = 0,
Text = $"Preparing to delete all {HumanisedModelName}s...",
CompletionText = $"Deleted all {HumanisedModelName}s!",
State = ProgressNotificationState.Active,
};
if (!silent)
PostNotification?.Invoke(notification);
int i = 0;
foreach (var b in items)
{
if (notification.State == ProgressNotificationState.Cancelled)
// user requested abort
return;
notification.Text = $"Deleting {HumanisedModelName}s ({++i} of {items.Count})";
Delete(b);
notification.Progress = (float)i / items.Count;
}
notification.State = ProgressNotificationState.Completed;
}
/// <summary>
/// Restore multiple items that were previously deleted.
/// This will post notifications tracking progress.
/// </summary>
public void Undelete(List<TModel> items, bool silent = false)
{
if (!items.Any())
{
if (!silent)
PostNotification?.Invoke(new ProgressCompletionNotification { Text = $"No {HumanisedModelName}s found to restore!" });
return;
}
var notification = new ProgressNotification
{
CompletionText = "Restored all deleted items!",
Progress = 0,
State = ProgressNotificationState.Active,
};
if (!silent)
PostNotification?.Invoke(notification);
int i = 0;
foreach (var item in items)
{
if (notification.State == ProgressNotificationState.Cancelled)
// user requested abort
return;
notification.Text = $"Restoring ({++i} of {items.Count})";
Undelete(item);
notification.Progress = (float)i / items.Count;
}
notification.State = ProgressNotificationState.Completed;
}
public bool Delete(TModel item)
{
// Importantly, begin the realm write *before* re-fetching, else the update realm may not be in a consistent state
// (ie. if an async import finished very recently).
return Realm.Write(realm =>
{
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TModel? processableItem = item;
if (!processableItem.IsManaged)
processableItem = realm.Find<TModel>(item.ID);
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if (processableItem?.DeletePending != false)
return false;
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processableItem.DeletePending = true;
return true;
});
}
public void Undelete(TModel item)
{
// Importantly, begin the realm write *before* re-fetching, else the update realm may not be in a consistent state
// (ie. if an async import finished very recently).
Realm.Write(realm =>
{
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TModel? processableItem = item;
if (!processableItem.IsManaged)
processableItem = realm.Find<TModel>(item.ID);
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if (processableItem?.DeletePending != true)
return;
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processableItem.DeletePending = false;
});
}
public virtual bool IsAvailableLocally(TModel model) => true;
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public Action<Notification>? PostNotification { get; set; }
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public virtual string HumanisedModelName => $"{typeof(TModel).Name.Replace(@"Info", "").ToLowerInvariant()}";
}
}