From 4c7eca931390f82237273b39cc26381323623180 Mon Sep 17 00:00:00 2001
From: Patrick Barron <barronpm@gmail.com>
Date: Tue, 6 Feb 2024 16:35:38 -0500
Subject: [PATCH] Use IHostApplicationLifetime to start library monitor

---
 .../IO/LibraryMonitor.cs                      | 71 ++++++-------------
 .../IO/LibraryMonitorStartup.cs               | 35 ---------
 .../Library/ILibraryMonitor.cs                |  9 ++-
 3 files changed, 24 insertions(+), 91 deletions(-)
 delete mode 100644 Emby.Server.Implementations/IO/LibraryMonitorStartup.cs

diff --git a/Emby.Server.Implementations/IO/LibraryMonitor.cs b/Emby.Server.Implementations/IO/LibraryMonitor.cs
index dde38906f3..31617d1a5f 100644
--- a/Emby.Server.Implementations/IO/LibraryMonitor.cs
+++ b/Emby.Server.Implementations/IO/LibraryMonitor.cs
@@ -1,5 +1,3 @@
-#pragma warning disable CS1591
-
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
@@ -11,11 +9,13 @@ using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Library;
 using MediaBrowser.Model.IO;
+using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 
 namespace Emby.Server.Implementations.IO
 {
-    public class LibraryMonitor : ILibraryMonitor
+    /// <inheritdoc cref="ILibraryMonitor" />
+    public sealed class LibraryMonitor : ILibraryMonitor, IDisposable
     {
         private readonly ILogger<LibraryMonitor> _logger;
         private readonly ILibraryManager _libraryManager;
@@ -25,19 +25,19 @@ namespace Emby.Server.Implementations.IO
         /// <summary>
         /// The file system watchers.
         /// </summary>
-        private readonly ConcurrentDictionary<string, FileSystemWatcher> _fileSystemWatchers = new ConcurrentDictionary<string, FileSystemWatcher>(StringComparer.OrdinalIgnoreCase);
+        private readonly ConcurrentDictionary<string, FileSystemWatcher> _fileSystemWatchers = new(StringComparer.OrdinalIgnoreCase);
 
         /// <summary>
         /// The affected paths.
         /// </summary>
-        private readonly List<FileRefresher> _activeRefreshers = new List<FileRefresher>();
+        private readonly List<FileRefresher> _activeRefreshers = [];
 
         /// <summary>
         /// A dynamic list of paths that should be ignored.  Added to during our own file system modifications.
         /// </summary>
-        private readonly ConcurrentDictionary<string, string> _tempIgnoredPaths = new ConcurrentDictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        private readonly ConcurrentDictionary<string, string> _tempIgnoredPaths = new(StringComparer.OrdinalIgnoreCase);
 
-        private bool _disposed = false;
+        private bool _disposed;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="LibraryMonitor" /> class.
@@ -46,34 +46,31 @@ namespace Emby.Server.Implementations.IO
         /// <param name="libraryManager">The library manager.</param>
         /// <param name="configurationManager">The configuration manager.</param>
         /// <param name="fileSystem">The filesystem.</param>
+        /// <param name="appLifetime">The <see cref="IHostApplicationLifetime"/>.</param>
         public LibraryMonitor(
             ILogger<LibraryMonitor> logger,
             ILibraryManager libraryManager,
             IServerConfigurationManager configurationManager,
-            IFileSystem fileSystem)
+            IFileSystem fileSystem,
+            IHostApplicationLifetime appLifetime)
         {
             _libraryManager = libraryManager;
             _logger = logger;
             _configurationManager = configurationManager;
             _fileSystem = fileSystem;
-        }
 
-        /// <summary>
-        /// Add the path to our temporary ignore list.  Use when writing to a path within our listening scope.
-        /// </summary>
-        /// <param name="path">The path.</param>
-        private void TemporarilyIgnore(string path)
-        {
-            _tempIgnoredPaths[path] = path;
+            appLifetime.ApplicationStarted.Register(Start);
         }
 
+        /// <inheritdoc />
         public void ReportFileSystemChangeBeginning(string path)
         {
             ArgumentException.ThrowIfNullOrEmpty(path);
 
-            TemporarilyIgnore(path);
+            _tempIgnoredPaths[path] = path;
         }
 
+        /// <inheritdoc />
         public async void ReportFileSystemChangeComplete(string path, bool refreshPath)
         {
             ArgumentException.ThrowIfNullOrEmpty(path);
@@ -107,14 +104,10 @@ namespace Emby.Server.Implementations.IO
 
             var options = _libraryManager.GetLibraryOptions(item);
 
-            if (options is not null)
-            {
-                return options.EnableRealtimeMonitor;
-            }
-
-            return false;
+            return options is not null && options.EnableRealtimeMonitor;
         }
 
+        /// <inheritdoc />
         public void Start()
         {
             _libraryManager.ItemAdded += OnLibraryManagerItemAdded;
@@ -306,20 +299,11 @@ namespace Emby.Server.Implementations.IO
             {
                 if (removeFromList)
                 {
-                    RemoveWatcherFromList(watcher);
+                    _fileSystemWatchers.TryRemove(watcher.Path, out _);
                 }
             }
         }
 
-        /// <summary>
-        /// Removes the watcher from list.
-        /// </summary>
-        /// <param name="watcher">The watcher.</param>
-        private void RemoveWatcherFromList(FileSystemWatcher watcher)
-        {
-            _fileSystemWatchers.TryRemove(watcher.Path, out _);
-        }
-
         /// <summary>
         /// Handles the Error event of the watcher control.
         /// </summary>
@@ -352,6 +336,7 @@ namespace Emby.Server.Implementations.IO
             }
         }
 
+        /// <inheritdoc />
         public void ReportFileSystemChanged(string path)
         {
             ArgumentException.ThrowIfNullOrEmpty(path);
@@ -479,31 +464,15 @@ namespace Emby.Server.Implementations.IO
             }
         }
 
-        /// <summary>
-        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
-        /// </summary>
+        /// <inheritdoc />
         public void Dispose()
-        {
-            Dispose(true);
-            GC.SuppressFinalize(this);
-        }
-
-        /// <summary>
-        /// Releases unmanaged and - optionally - managed resources.
-        /// </summary>
-        /// <param name="disposing"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
-        protected virtual void Dispose(bool disposing)
         {
             if (_disposed)
             {
                 return;
             }
 
-            if (disposing)
-            {
-                Stop();
-            }
-
+            Stop();
             _disposed = true;
         }
     }
diff --git a/Emby.Server.Implementations/IO/LibraryMonitorStartup.cs b/Emby.Server.Implementations/IO/LibraryMonitorStartup.cs
deleted file mode 100644
index c51cf05459..0000000000
--- a/Emby.Server.Implementations/IO/LibraryMonitorStartup.cs
+++ /dev/null
@@ -1,35 +0,0 @@
-using System.Threading.Tasks;
-using MediaBrowser.Controller.Library;
-using MediaBrowser.Controller.Plugins;
-
-namespace Emby.Server.Implementations.IO
-{
-    /// <summary>
-    /// <see cref="IServerEntryPoint" /> which is responsible for starting the library monitor.
-    /// </summary>
-    public sealed class LibraryMonitorStartup : IServerEntryPoint
-    {
-        private readonly ILibraryMonitor _monitor;
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="LibraryMonitorStartup"/> class.
-        /// </summary>
-        /// <param name="monitor">The library monitor.</param>
-        public LibraryMonitorStartup(ILibraryMonitor monitor)
-        {
-            _monitor = monitor;
-        }
-
-        /// <inheritdoc />
-        public Task RunAsync()
-        {
-            _monitor.Start();
-            return Task.CompletedTask;
-        }
-
-        /// <inheritdoc />
-        public void Dispose()
-        {
-        }
-    }
-}
diff --git a/MediaBrowser.Controller/Library/ILibraryMonitor.cs b/MediaBrowser.Controller/Library/ILibraryMonitor.cs
index de74aa5a11..6d2f5b8738 100644
--- a/MediaBrowser.Controller/Library/ILibraryMonitor.cs
+++ b/MediaBrowser.Controller/Library/ILibraryMonitor.cs
@@ -1,10 +1,9 @@
-#pragma warning disable CS1591
-
-using System;
-
 namespace MediaBrowser.Controller.Library
 {
-    public interface ILibraryMonitor : IDisposable
+    /// <summary>
+    /// Service responsible for monitoring library filesystems for changes.
+    /// </summary>
+    public interface ILibraryMonitor
     {
         /// <summary>
         /// Starts this instance.