refactor: use ConcurrentDictionary when IMemoryCache isn't needed

Emby.Server.Implementations/Library/LibraryManager.cs

@@ -3,6 +3,7 @@
 #pragma warning disable CS1591
 
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
@@ -63,7 +64,7 @@ namespace Emby.Server.Implementations.Library
         private const string ShortcutFileExtension = ".mblink";
 
         private readonly ILogger<LibraryManager> _logger;
-        private readonly IMemoryCache _memoryCache;
+        private readonly ConcurrentDictionary<Guid, BaseItem> _cache;
         private readonly ITaskManager _taskManager;
         private readonly IUserManager _userManager;
         private readonly IUserDataManager _userDataRepository;
@@ -111,7 +112,6 @@ namespace Emby.Server.Implementations.Library
         /// <param name="mediaEncoder">The media encoder.</param>
         /// <param name="itemRepository">The item repository.</param>
         /// <param name="imageProcessor">The image processor.</param>
-        /// <param name="memoryCache">The memory cache.</param>
         /// <param name="namingOptions">The naming options.</param>
         /// <param name="directoryService">The directory service.</param>
         public LibraryManager(
@@ -128,7 +128,6 @@ namespace Emby.Server.Implementations.Library
             IMediaEncoder mediaEncoder,
             IItemRepository itemRepository,
             IImageProcessor imageProcessor,
-            IMemoryCache memoryCache,
             NamingOptions namingOptions,
             IDirectoryService directoryService)
         {
@@ -145,7 +144,7 @@ namespace Emby.Server.Implementations.Library
             _mediaEncoder = mediaEncoder;
             _itemRepository = itemRepository;
             _imageProcessor = imageProcessor;
-            _memoryCache = memoryCache;
+            _cache = new ConcurrentDictionary<Guid, BaseItem>();
             _namingOptions = namingOptions;
 
             _extraResolver = new ExtraResolver(loggerFactory.CreateLogger<ExtraResolver>(), namingOptions, directoryService);
@@ -300,7 +299,7 @@ namespace Emby.Server.Implementations.Library
                 }
             }
 
-            _memoryCache.Set(item.Id, item);
+            _cache[item.Id] = item;
         }
 
         public void DeleteItem(BaseItem item, DeleteOptions options)
@@ -441,7 +440,7 @@ namespace Emby.Server.Implementations.Library
                 _itemRepository.DeleteItem(child.Id);
             }
 
-            _memoryCache.Remove(item.Id);
+            _cache.TryRemove(item.Id, out _);
 
             ReportItemRemoved(item, parent);
         }
@@ -1233,7 +1232,7 @@ namespace Emby.Server.Implementations.Library
                 throw new ArgumentException("Guid can't be empty", nameof(id));
             }
 
-            if (_memoryCache.TryGetValue(id, out BaseItem item))
+            if (_cache.TryGetValue(id, out BaseItem item))
             {
                 return item;
             }

Emby.Server.Implementations/LiveTv/TunerHosts/BaseTunerHost.cs

@@ -3,6 +3,7 @@
 #pragma warning disable CS1591
 
 using System;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -23,14 +24,14 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 {
     public abstract class BaseTunerHost
     {
-        private readonly IMemoryCache _memoryCache;
+        private readonly ConcurrentDictionary<string, List<ChannelInfo>> _cache;
 
-        protected BaseTunerHost(IServerConfigurationManager config, ILogger<BaseTunerHost> logger, IFileSystem fileSystem, IMemoryCache memoryCache)
+        protected BaseTunerHost(IServerConfigurationManager config, ILogger<BaseTunerHost> logger, IFileSystem fileSystem)
         {
             Config = config;
             Logger = logger;
-            _memoryCache = memoryCache;
             FileSystem = fileSystem;
+            _cache = new ConcurrentDictionary<string, List<ChannelInfo>>();
         }
 
         protected IServerConfigurationManager Config { get; }
@@ -51,7 +52,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
         {
             var key = tuner.Id;
 
-            if (enableCache && !string.IsNullOrEmpty(key) && _memoryCache.TryGetValue(key, out List<ChannelInfo> cache))
+            if (enableCache && !string.IsNullOrEmpty(key) && _cache.TryGetValue(key, out List<ChannelInfo> cache))
             {
                 return cache;
             }
@@ -61,7 +62,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 
             if (!string.IsNullOrEmpty(key) && list.Count > 0)
             {
-                _memoryCache.Set(key, list);
+                _cache[key] = list;
             }
 
             return list;

Emby.Server.Implementations/LiveTv/TunerHosts/HdHomerun/HdHomerunHost.cs

@@ -50,9 +50,8 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
             IHttpClientFactory httpClientFactory,
             IServerApplicationHost appHost,
             ISocketFactory socketFactory,
-            IStreamHelper streamHelper,
-            IMemoryCache memoryCache)
-            : base(config, logger, fileSystem, memoryCache)
+            IStreamHelper streamHelper)
+            : base(config, logger, fileSystem)
         {
             _httpClientFactory = httpClientFactory;
             _appHost = appHost;

Emby.Server.Implementations/LiveTv/TunerHosts/M3UTunerHost.cs

@@ -54,9 +54,8 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
             IHttpClientFactory httpClientFactory,
             IServerApplicationHost appHost,
             INetworkManager networkManager,
-            IStreamHelper streamHelper,
-            IMemoryCache memoryCache)
-            : base(config, logger, fileSystem, memoryCache)
+            IStreamHelper streamHelper)
+            : base(config, logger, fileSystem)
         {
             _httpClientFactory = httpClientFactory;
             _appHost = appHost;