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jellyfin/MediaBrowser.Common.Impleme.../BaseApplicationHost.cs

332 lines
10 KiB

using System.IO;
using System.Linq;
using System.Reflection;
using MediaBrowser.Common.Kernel;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Serialization;
using SimpleInjector;
using System;
using System.Collections.Generic;
using System.Threading;
namespace MediaBrowser.Common.Implementations
{
public abstract class BaseApplicationHost : IDisposable
{
/// <summary>
/// Gets or sets the logger.
/// </summary>
/// <value>The logger.</value>
public ILogger Logger { get; protected set; }
/// <summary>
/// Gets or sets the log manager.
/// </summary>
/// <value>The log manager.</value>
public ILogManager LogManager { get; protected set; }
/// <summary>
/// Gets the application paths.
/// </summary>
/// <value>The application paths.</value>
protected IApplicationPaths ApplicationPaths { get; private set; }
/// <summary>
/// The container
/// </summary>
protected readonly Container Container = new Container();
/// <summary>
/// Gets assemblies that failed to load
/// </summary>
public List<string> FailedAssemblies { get; protected set; }
/// <summary>
/// Gets all types within all running assemblies
/// </summary>
/// <value>All types.</value>
public Type[] AllTypes { get; protected set; }
/// <summary>
/// Gets all concrete types.
/// </summary>
/// <value>All concrete types.</value>
public Type[] AllConcreteTypes { get; protected set; }
/// <summary>
/// The disposable parts
/// </summary>
protected readonly List<IDisposable> DisposableParts = new List<IDisposable>();
/// <summary>
/// Gets a value indicating whether this instance is first run.
/// </summary>
/// <value><c>true</c> if this instance is first run; otherwise, <c>false</c>.</value>
public bool IsFirstRun { get; private set; }
/// <summary>
/// The _protobuf serializer initialized
/// </summary>
private bool _protobufSerializerInitialized;
/// <summary>
/// The _protobuf serializer sync lock
/// </summary>
private object _protobufSerializerSyncLock = new object();
/// <summary>
/// Gets a dynamically compiled generated serializer that can serialize protocontracts without reflection
/// </summary>
private IProtobufSerializer _protobufSerializer;
/// <summary>
/// Gets the protobuf serializer.
/// </summary>
/// <value>The protobuf serializer.</value>
protected IProtobufSerializer ProtobufSerializer
{
get
{
// Lazy load
LazyInitializer.EnsureInitialized(ref _protobufSerializer, ref _protobufSerializerInitialized, ref _protobufSerializerSyncLock, () => Serialization.ProtobufSerializer.Create(AllTypes));
return _protobufSerializer;
}
private set
{
_protobufSerializer = value;
_protobufSerializerInitialized = value != null;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="BaseApplicationHost" /> class.
/// </summary>
protected BaseApplicationHost()
{
FailedAssemblies = new List<string>();
ApplicationPaths = GetApplicationPaths();
LogManager = GetLogManager();
Logger = LogManager.GetLogger("App");
IsFirstRun = !File.Exists(ApplicationPaths.SystemConfigurationFilePath);
DiscoverTypes();
}
/// <summary>
/// Gets the composable part assemblies.
/// </summary>
/// <returns>IEnumerable{Assembly}.</returns>
protected abstract IEnumerable<Assembly> GetComposablePartAssemblies();
/// <summary>
/// Gets the log manager.
/// </summary>
/// <returns>ILogManager.</returns>
protected abstract ILogManager GetLogManager();
/// <summary>
/// Gets the application paths.
/// </summary>
/// <returns>IApplicationPaths.</returns>
protected abstract IApplicationPaths GetApplicationPaths();
/// <summary>
/// Discovers the types.
/// </summary>
protected void DiscoverTypes()
{
FailedAssemblies.Clear();
AllTypes = GetComposablePartAssemblies().SelectMany(GetTypes).ToArray();
AllConcreteTypes = AllTypes.Where(t => t.IsClass && !t.IsAbstract && !t.IsInterface && !t.IsGenericType).ToArray();
}
/// <summary>
/// Gets a list of types within an assembly
/// 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
/// </summary>
/// <param name="assembly">The assembly.</param>
/// <returns>IEnumerable{Type}.</returns>
/// <exception cref="System.ArgumentNullException">assembly</exception>
protected IEnumerable<Type> GetTypes(Assembly assembly)
{
if (assembly == null)
{
throw new ArgumentNullException("assembly");
}
try
{
return assembly.GetTypes();
}
catch (ReflectionTypeLoadException ex)
{
// If it fails we can still get a list of the Types it was able to resolve
return ex.Types.Where(t => t != null);
}
}
/// <summary>
/// Creates an instance of type and resolves all constructor dependancies
/// </summary>
/// <param name="type">The type.</param>
/// <returns>System.Object.</returns>
public object CreateInstance(Type type)
{
try
{
return Container.GetInstance(type);
}
catch
{
Logger.Error("Error creating {0}", type.Name);
throw;
}
}
/// <summary>
/// Registers the specified obj.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="obj">The obj.</param>
/// <param name="manageLifetime">if set to <c>true</c> [manage lifetime].</param>
protected void RegisterSingleInstance<T>(T obj, bool manageLifetime = true)
where T : class
{
Container.RegisterSingle(obj);
if (manageLifetime)
{
var disposable = obj as IDisposable;
if (disposable != null)
{
Logger.Info("Registering " + disposable.GetType().Name);
DisposableParts.Add(disposable);
}
}
}
/// <summary>
/// Registers the single instance.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="func">The func.</param>
protected void RegisterSingleInstance<T>(Func<T> func)
where T : class
{
Container.RegisterSingle(func);
}
/// <summary>
/// Resolves this instance.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns>``0.</returns>
public T Resolve<T>()
{
return (T)Container.GetRegistration(typeof(T), true).GetInstance();
}
/// <summary>
/// Resolves this instance.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns>``0.</returns>
public T TryResolve<T>()
{
var result = Container.GetRegistration(typeof(T), false);
if (result == null)
{
return default(T);
}
return (T)result.GetInstance();
}
/// <summary>
/// Loads the assembly.
/// </summary>
/// <param name="file">The file.</param>
/// <returns>Assembly.</returns>
protected Assembly LoadAssembly(string file)
{
try
{
return Assembly.Load(File.ReadAllBytes((file)));
}
catch (Exception ex)
{
FailedAssemblies.Add(file);
Logger.ErrorException("Error loading assembly {0}", ex, file);
return null;
}
}
/// <summary>
/// Gets the exports.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="manageLiftime">if set to <c>true</c> [manage liftime].</param>
/// <returns>IEnumerable{``0}.</returns>
public IEnumerable<T> GetExports<T>(bool manageLiftime = true)
{
var currentType = typeof(T);
Logger.Info("Composing instances of " + currentType.Name);
var parts = AllConcreteTypes.Where(currentType.IsAssignableFrom).Select(CreateInstance).Cast<T>().ToArray();
if (manageLiftime)
{
DisposableParts.AddRange(parts.OfType<IDisposable>());
}
return parts;
}
/// <summary>
/// Gets the current application version
/// </summary>
/// <value>The application version.</value>
public Version ApplicationVersion
{
get
{
return GetType().Assembly.GetName().Version;
}
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
}
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool dispose)
{
var type = GetType();
Logger.Info("Disposing " + type.Name);
foreach (var part in DisposableParts.Distinct().Where(i => i.GetType() != type).ToList())
{
Logger.Info("Disposing " + part.GetType().Name);
part.Dispose();
}
DisposableParts.Clear();
}
}
}