mirror of
https://github.com/jellyfin/jellyfin.git
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162 lines
5.2 KiB
C#
162 lines
5.2 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.Session;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Session;
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using Microsoft.Extensions.Hosting;
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namespace Emby.Server.Implementations.EntryPoints
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{
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/// <summary>
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/// <see cref="IHostedService"/> responsible for notifying users when associated item data is updated.
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/// </summary>
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public sealed class UserDataChangeNotifier : IHostedService, IDisposable
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{
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private const int UpdateDuration = 500;
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private readonly ISessionManager _sessionManager;
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private readonly IUserDataManager _userDataManager;
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private readonly IUserManager _userManager;
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private readonly Dictionary<Guid, List<BaseItem>> _changedItems = new();
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private readonly object _syncLock = new();
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private Timer? _updateTimer;
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/// <summary>
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/// Initializes a new instance of the <see cref="UserDataChangeNotifier"/> class.
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/// </summary>
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/// <param name="userDataManager">The <see cref="IUserDataManager"/>.</param>
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/// <param name="sessionManager">The <see cref="ISessionManager"/>.</param>
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/// <param name="userManager">The <see cref="IUserManager"/>.</param>
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public UserDataChangeNotifier(
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IUserDataManager userDataManager,
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ISessionManager sessionManager,
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IUserManager userManager)
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{
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_userDataManager = userDataManager;
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_sessionManager = sessionManager;
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_userManager = userManager;
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}
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/// <inheritdoc />
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public Task StartAsync(CancellationToken cancellationToken)
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{
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_userDataManager.UserDataSaved += OnUserDataManagerUserDataSaved;
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return Task.CompletedTask;
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}
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/// <inheritdoc />
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public Task StopAsync(CancellationToken cancellationToken)
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{
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_userDataManager.UserDataSaved -= OnUserDataManagerUserDataSaved;
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return Task.CompletedTask;
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}
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private void OnUserDataManagerUserDataSaved(object? sender, UserDataSaveEventArgs e)
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{
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if (e.SaveReason == UserDataSaveReason.PlaybackProgress)
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{
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return;
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}
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lock (_syncLock)
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{
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if (_updateTimer is null)
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{
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_updateTimer = new Timer(
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UpdateTimerCallback,
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null,
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UpdateDuration,
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Timeout.Infinite);
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}
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else
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{
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_updateTimer.Change(UpdateDuration, Timeout.Infinite);
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}
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if (!_changedItems.TryGetValue(e.UserId, out List<BaseItem>? keys))
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{
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keys = new List<BaseItem>();
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_changedItems[e.UserId] = keys;
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}
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keys.Add(e.Item);
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var baseItem = e.Item;
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// Go up one level for indicators
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if (baseItem is not null)
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{
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var parent = baseItem.GetOwner() ?? baseItem.GetParent();
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if (parent is not null)
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{
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keys.Add(parent);
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}
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}
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}
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}
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private async void UpdateTimerCallback(object? state)
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{
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List<KeyValuePair<Guid, List<BaseItem>>> changes;
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lock (_syncLock)
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{
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// Remove dupes in case some were saved multiple times
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changes = _changedItems.ToList();
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_changedItems.Clear();
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if (_updateTimer is not null)
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{
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_updateTimer.Dispose();
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_updateTimer = null;
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}
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}
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foreach (var (userId, changedItems) in changes)
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{
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await _sessionManager.SendMessageToUserSessions(
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[userId],
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SessionMessageType.UserDataChanged,
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() => GetUserDataChangeInfo(userId, changedItems),
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default).ConfigureAwait(false);
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}
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}
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private UserDataChangeInfo GetUserDataChangeInfo(Guid userId, List<BaseItem> changedItems)
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{
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var user = _userManager.GetUserById(userId);
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return new UserDataChangeInfo
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{
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UserId = userId.ToString("N", CultureInfo.InvariantCulture),
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UserDataList = changedItems
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.DistinctBy(x => x.Id)
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.Select(i =>
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{
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var dto = _userDataManager.GetUserDataDto(i, user);
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dto.ItemId = i.Id.ToString("N", CultureInfo.InvariantCulture);
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return dto;
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})
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.ToArray()
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};
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}
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/// <inheritdoc />
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public void Dispose()
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{
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_updateTimer?.Dispose();
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_updateTimer = null;
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}
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}
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}
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