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https://github.com/jellyfin/jellyfin.git
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402 lines
13 KiB
C#
402 lines
13 KiB
C#
using MediaBrowser.Common.Implementations.Udp;
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using MediaBrowser.Common.Implementations.Updates;
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using MediaBrowser.Common.Implementations.WebSocket;
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using MediaBrowser.Common.Kernel;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Common.Plugins;
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using MediaBrowser.Common.ScheduledTasks;
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using MediaBrowser.Common.Updates;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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using SimpleInjector;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Threading;
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namespace MediaBrowser.Common.Implementations
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{
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public abstract class BaseApplicationHost
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{
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/// <summary>
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/// Gets or sets the logger.
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/// </summary>
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/// <value>The logger.</value>
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public ILogger Logger { get; protected set; }
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/// <summary>
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/// Gets or sets the plugins.
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/// </summary>
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/// <value>The plugins.</value>
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public IEnumerable<IPlugin> Plugins { get; protected set; }
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/// <summary>
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/// Gets or sets the log manager.
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/// </summary>
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/// <value>The log manager.</value>
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public ILogManager LogManager { get; protected set; }
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/// <summary>
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/// Gets the application paths.
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/// </summary>
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/// <value>The application paths.</value>
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protected IApplicationPaths ApplicationPaths { get; private set; }
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/// <summary>
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/// The container
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/// </summary>
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protected readonly Container Container = new Container();
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/// <summary>
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/// Gets assemblies that failed to load
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/// </summary>
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public List<string> FailedAssemblies { get; protected set; }
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/// <summary>
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/// Gets all types within all running assemblies
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/// </summary>
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/// <value>All types.</value>
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public Type[] AllTypes { get; protected set; }
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/// <summary>
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/// Gets all concrete types.
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/// </summary>
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/// <value>All concrete types.</value>
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public Type[] AllConcreteTypes { get; protected set; }
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/// <summary>
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/// The disposable parts
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/// </summary>
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protected readonly List<IDisposable> DisposableParts = new List<IDisposable>();
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/// <summary>
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/// Gets a value indicating whether this instance is first run.
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/// </summary>
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/// <value><c>true</c> if this instance is first run; otherwise, <c>false</c>.</value>
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public bool IsFirstRun { get; private set; }
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/// <summary>
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/// The _protobuf serializer initialized
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/// </summary>
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private bool _protobufSerializerInitialized;
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/// <summary>
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/// The _protobuf serializer sync lock
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/// </summary>
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private object _protobufSerializerSyncLock = new object();
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/// <summary>
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/// Gets a dynamically compiled generated serializer that can serialize protocontracts without reflection
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/// </summary>
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private IProtobufSerializer _protobufSerializer;
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/// <summary>
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/// Gets the protobuf serializer.
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/// </summary>
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/// <value>The protobuf serializer.</value>
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protected IProtobufSerializer ProtobufSerializer
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{
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get
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{
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// Lazy load
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LazyInitializer.EnsureInitialized(ref _protobufSerializer, ref _protobufSerializerInitialized, ref _protobufSerializerSyncLock, () => Serialization.ProtobufSerializer.Create(AllTypes));
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return _protobufSerializer;
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}
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private set
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{
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_protobufSerializer = value;
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_protobufSerializerInitialized = value != null;
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}
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="BaseApplicationHost" /> class.
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/// </summary>
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protected BaseApplicationHost()
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{
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FailedAssemblies = new List<string>();
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ApplicationPaths = GetApplicationPaths();
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LogManager = GetLogManager();
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Logger = LogManager.GetLogger("App");
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IsFirstRun = !File.Exists(ApplicationPaths.SystemConfigurationFilePath);
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DiscoverTypes();
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}
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/// <summary>
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/// Gets the composable part assemblies.
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/// </summary>
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/// <returns>IEnumerable{Assembly}.</returns>
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protected abstract IEnumerable<Assembly> GetComposablePartAssemblies();
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/// <summary>
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/// Gets the log manager.
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/// </summary>
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/// <returns>ILogManager.</returns>
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protected abstract ILogManager GetLogManager();
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/// <summary>
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/// Gets the application paths.
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/// </summary>
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/// <returns>IApplicationPaths.</returns>
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protected abstract IApplicationPaths GetApplicationPaths();
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/// <summary>
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/// Finds the parts.
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/// </summary>
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protected virtual void FindParts()
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{
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Resolve<IHttpServer>().Init(GetExports<IRestfulService>(false));
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Resolve<IServerManager>().AddWebSocketListeners(GetExports<IWebSocketListener>(false));
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Resolve<IServerManager>().Start();
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Resolve<ITaskManager>().AddTasks(GetExports<IScheduledTask>(false));
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Plugins = GetExports<IPlugin>();
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}
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/// <summary>
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/// Discovers the types.
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/// </summary>
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protected void DiscoverTypes()
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{
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FailedAssemblies.Clear();
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AllTypes = GetComposablePartAssemblies().SelectMany(GetTypes).ToArray();
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AllConcreteTypes = AllTypes.Where(t => t.IsClass && !t.IsAbstract && !t.IsInterface && !t.IsGenericType).ToArray();
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}
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/// <summary>
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/// Registers resources that classes will depend on
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/// </summary>
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protected virtual void RegisterResources(ITaskManager taskManager, INetworkManager networkManager, IServerManager serverManager)
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{
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RegisterSingleInstance(LogManager);
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RegisterSingleInstance(Logger);
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RegisterSingleInstance(ApplicationPaths);
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RegisterSingleInstance(taskManager);
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RegisterSingleInstance<IWebSocketServer>(() => new AlchemyServer(Logger));
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RegisterSingleInstance(ProtobufSerializer);
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RegisterSingleInstance<IUdpServer>(new UdpServer(Logger), false);
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RegisterSingleInstance<IPackageManager>(new PackageManager());
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RegisterSingleInstance<IHttpClient>(new HttpClientManager.HttpClientManager(ApplicationPaths, Logger));
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RegisterSingleInstance(networkManager);
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RegisterSingleInstance(serverManager);
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}
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/// <summary>
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/// Gets a list of types within an assembly
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/// This will handle situations that would normally throw an exception - such as a type within the assembly that depends on some other non-existant reference
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/// </summary>
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/// <param name="assembly">The assembly.</param>
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/// <returns>IEnumerable{Type}.</returns>
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/// <exception cref="System.ArgumentNullException">assembly</exception>
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protected IEnumerable<Type> GetTypes(Assembly assembly)
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{
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if (assembly == null)
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{
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throw new ArgumentNullException("assembly");
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}
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try
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{
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return assembly.GetTypes();
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}
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catch (ReflectionTypeLoadException ex)
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{
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// If it fails we can still get a list of the Types it was able to resolve
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return ex.Types.Where(t => t != null);
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}
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}
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/// <summary>
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/// Creates an instance of type and resolves all constructor dependancies
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>System.Object.</returns>
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public object CreateInstance(Type type)
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{
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try
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{
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return Container.GetInstance(type);
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}
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catch
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{
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Logger.Error("Error creating {0}", type.Name);
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throw;
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}
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}
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/// <summary>
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/// Registers the specified obj.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="obj">The obj.</param>
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/// <param name="manageLifetime">if set to <c>true</c> [manage lifetime].</param>
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protected void RegisterSingleInstance<T>(T obj, bool manageLifetime = true)
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where T : class
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{
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Container.RegisterSingle(obj);
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if (manageLifetime)
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{
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var disposable = obj as IDisposable;
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if (disposable != null)
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{
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Logger.Info("Registering " + disposable.GetType().Name);
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DisposableParts.Add(disposable);
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}
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}
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}
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/// <summary>
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/// Registers the single instance.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="func">The func.</param>
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protected void RegisterSingleInstance<T>(Func<T> func)
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where T : class
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{
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Container.RegisterSingle(func);
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}
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/// <summary>
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/// Resolves this instance.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <returns>``0.</returns>
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public T Resolve<T>()
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{
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return (T)Container.GetRegistration(typeof(T), true).GetInstance();
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}
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/// <summary>
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/// Resolves this instance.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <returns>``0.</returns>
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public T TryResolve<T>()
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{
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var result = Container.GetRegistration(typeof(T), false);
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if (result == null)
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{
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return default(T);
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}
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return (T)result.GetInstance();
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}
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/// <summary>
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/// Loads the assembly.
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/// </summary>
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/// <param name="file">The file.</param>
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/// <returns>Assembly.</returns>
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protected Assembly LoadAssembly(string file)
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{
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try
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{
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return Assembly.Load(File.ReadAllBytes((file)));
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}
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catch (Exception ex)
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{
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FailedAssemblies.Add(file);
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Logger.ErrorException("Error loading assembly {0}", ex, file);
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return null;
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}
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}
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/// <summary>
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/// Gets the exports.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="manageLiftime">if set to <c>true</c> [manage liftime].</param>
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/// <returns>IEnumerable{``0}.</returns>
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public IEnumerable<T> GetExports<T>(bool manageLiftime = true)
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{
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var currentType = typeof(T);
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Logger.Info("Composing instances of " + currentType.Name);
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var parts = AllConcreteTypes.Where(currentType.IsAssignableFrom).Select(CreateInstance).Cast<T>().ToArray();
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if (manageLiftime)
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{
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DisposableParts.AddRange(parts.OfType<IDisposable>());
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}
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return parts;
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}
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/// <summary>
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/// Gets the current application version
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/// </summary>
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/// <value>The application version.</value>
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public Version ApplicationVersion
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{
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get
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{
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return GetType().Assembly.GetName().Version;
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}
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}
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/// <summary>
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/// Configures the auto run at startup.
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/// </summary>
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/// <param name="autorun">if set to <c>true</c> [autorun].</param>
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public void ConfigureAutoRunAtStartup(bool autorun)
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{
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}
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/// <summary>
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/// Removes the plugin.
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/// </summary>
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/// <param name="plugin">The plugin.</param>
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public void RemovePlugin(IPlugin plugin)
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{
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var list = Plugins.ToList();
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list.Remove(plugin);
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Plugins = list;
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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}
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/// <summary>
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/// Releases unmanaged and - optionally - managed resources.
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/// </summary>
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/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected virtual void Dispose(bool dispose)
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{
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if (dispose)
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{
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var type = GetType();
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Logger.Info("Disposing " + type.Name);
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var parts = DisposableParts.Distinct().Where(i => i.GetType() != type).ToList();
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DisposableParts.Clear();
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foreach (var part in parts)
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{
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Logger.Info("Disposing " + part.GetType().Name);
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part.Dispose();
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}
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}
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}
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}
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}
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