make more classes portable

Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs

@@ -0,0 +1,328 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Common.Events;
+using MediaBrowser.Common.Extensions;
+using MediaBrowser.Model.Configuration;
+using MediaBrowser.Model.IO;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Model.Serialization;
+
+namespace Emby.Server.Implementations.AppBase
+{
+    /// <summary>
+    /// Class BaseConfigurationManager
+    /// </summary>
+    public abstract class BaseConfigurationManager : IConfigurationManager
+    {
+        /// <summary>
+        /// Gets the type of the configuration.
+        /// </summary>
+        /// <value>The type of the configuration.</value>
+        protected abstract Type ConfigurationType { get; }
+
+        /// <summary>
+        /// Occurs when [configuration updated].
+        /// </summary>
+        public event EventHandler<EventArgs> ConfigurationUpdated;
+
+        /// <summary>
+        /// Occurs when [configuration updating].
+        /// </summary>
+        public event EventHandler<ConfigurationUpdateEventArgs> NamedConfigurationUpdating;
+
+        /// <summary>
+        /// Occurs when [named configuration updated].
+        /// </summary>
+        public event EventHandler<ConfigurationUpdateEventArgs> NamedConfigurationUpdated;
+
+        /// <summary>
+        /// Gets the logger.
+        /// </summary>
+        /// <value>The logger.</value>
+        protected ILogger Logger { get; private set; }
+        /// <summary>
+        /// Gets the XML serializer.
+        /// </summary>
+        /// <value>The XML serializer.</value>
+        protected IXmlSerializer XmlSerializer { get; private set; }
+
+        /// <summary>
+        /// Gets or sets the application paths.
+        /// </summary>
+        /// <value>The application paths.</value>
+        public IApplicationPaths CommonApplicationPaths { get; private set; }
+        public readonly IFileSystem FileSystem;
+
+        /// <summary>
+        /// The _configuration loaded
+        /// </summary>
+        private bool _configurationLoaded;
+        /// <summary>
+        /// The _configuration sync lock
+        /// </summary>
+        private object _configurationSyncLock = new object();
+        /// <summary>
+        /// The _configuration
+        /// </summary>
+        private BaseApplicationConfiguration _configuration;
+        /// <summary>
+        /// Gets the system configuration
+        /// </summary>
+        /// <value>The configuration.</value>
+        public BaseApplicationConfiguration CommonConfiguration
+        {
+            get
+            {
+                // Lazy load
+                LazyInitializer.EnsureInitialized(ref _configuration, ref _configurationLoaded, ref _configurationSyncLock, () => (BaseApplicationConfiguration)ConfigurationHelper.GetXmlConfiguration(ConfigurationType, CommonApplicationPaths.SystemConfigurationFilePath, XmlSerializer, FileSystem));
+                return _configuration;
+            }
+            protected set
+            {
+                _configuration = value;
+
+                _configurationLoaded = value != null;
+            }
+        }
+
+        private ConfigurationStore[] _configurationStores = { };
+        private IConfigurationFactory[] _configurationFactories = { };
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="BaseConfigurationManager" /> class.
+        /// </summary>
+        /// <param name="applicationPaths">The application paths.</param>
+        /// <param name="logManager">The log manager.</param>
+        /// <param name="xmlSerializer">The XML serializer.</param>
+        protected BaseConfigurationManager(IApplicationPaths applicationPaths, ILogManager logManager, IXmlSerializer xmlSerializer, IFileSystem fileSystem)
+        {
+            CommonApplicationPaths = applicationPaths;
+            XmlSerializer = xmlSerializer;
+            FileSystem = fileSystem;
+            Logger = logManager.GetLogger(GetType().Name);
+
+            UpdateCachePath();
+        }
+
+        public virtual void AddParts(IEnumerable<IConfigurationFactory> factories)
+        {
+            _configurationFactories = factories.ToArray();
+
+            _configurationStores = _configurationFactories
+                .SelectMany(i => i.GetConfigurations())
+                .ToArray();
+        }
+
+        /// <summary>
+        /// Saves the configuration.
+        /// </summary>
+        public void SaveConfiguration()
+        {
+            Logger.Info("Saving system configuration");
+            var path = CommonApplicationPaths.SystemConfigurationFilePath;
+
+            FileSystem.CreateDirectory(Path.GetDirectoryName(path));
+
+            lock (_configurationSyncLock)
+            {
+                XmlSerializer.SerializeToFile(CommonConfiguration, path);
+            }
+
+            OnConfigurationUpdated();
+        }
+
+        /// <summary>
+        /// Called when [configuration updated].
+        /// </summary>
+        protected virtual void OnConfigurationUpdated()
+        {
+            UpdateCachePath();
+
+            EventHelper.QueueEventIfNotNull(ConfigurationUpdated, this, EventArgs.Empty, Logger);
+        }
+
+        /// <summary>
+        /// Replaces the configuration.
+        /// </summary>
+        /// <param name="newConfiguration">The new configuration.</param>
+        /// <exception cref="System.ArgumentNullException">newConfiguration</exception>
+        public virtual void ReplaceConfiguration(BaseApplicationConfiguration newConfiguration)
+        {
+            if (newConfiguration == null)
+            {
+                throw new ArgumentNullException("newConfiguration");
+            }
+
+            ValidateCachePath(newConfiguration);
+
+            CommonConfiguration = newConfiguration;
+            SaveConfiguration();
+        }
+
+        /// <summary>
+        /// Updates the items by name path.
+        /// </summary>
+        private void UpdateCachePath()
+        {
+            string cachePath;
+
+            if (string.IsNullOrWhiteSpace(CommonConfiguration.CachePath))
+            {
+                cachePath = null;
+            }
+            else
+            {
+                cachePath = Path.Combine(CommonConfiguration.CachePath, "cache");
+            }
+
+            ((BaseApplicationPaths)CommonApplicationPaths).CachePath = cachePath;
+        }
+
+        /// <summary>
+        /// Replaces the cache path.
+        /// </summary>
+        /// <param name="newConfig">The new configuration.</param>
+        /// <exception cref="System.IO.DirectoryNotFoundException"></exception>
+        private void ValidateCachePath(BaseApplicationConfiguration newConfig)
+        {
+            var newPath = newConfig.CachePath;
+
+            if (!string.IsNullOrWhiteSpace(newPath)
+                && !string.Equals(CommonConfiguration.CachePath ?? string.Empty, newPath))
+            {
+                // Validate
+                if (!FileSystem.DirectoryExists(newPath))
+                {
+                    throw new FileNotFoundException(string.Format("{0} does not exist.", newPath));
+                }
+
+                EnsureWriteAccess(newPath);
+            }
+        }
+
+        protected void EnsureWriteAccess(string path)
+        {
+            var file = Path.Combine(path, Guid.NewGuid().ToString());
+
+            FileSystem.WriteAllText(file, string.Empty);
+            FileSystem.DeleteFile(file);
+        }
+
+        private readonly ConcurrentDictionary<string, object> _configurations = new ConcurrentDictionary<string, object>();
+
+        private string GetConfigurationFile(string key)
+        {
+            return Path.Combine(CommonApplicationPaths.ConfigurationDirectoryPath, key.ToLower() + ".xml");
+        }
+
+        public object GetConfiguration(string key)
+        {
+            return _configurations.GetOrAdd(key, k =>
+            {
+                var file = GetConfigurationFile(key);
+
+                var configurationInfo = _configurationStores
+                    .FirstOrDefault(i => string.Equals(i.Key, key, StringComparison.OrdinalIgnoreCase));
+
+                if (configurationInfo == null)
+                {
+                    throw new ResourceNotFoundException("Configuration with key " + key + " not found.");
+                }
+
+                var configurationType = configurationInfo.ConfigurationType;
+
+                lock (_configurationSyncLock)
+                {
+                    return LoadConfiguration(file, configurationType);
+                }
+            });
+        }
+
+        private object LoadConfiguration(string path, Type configurationType)
+        {
+            try
+            {
+                return XmlSerializer.DeserializeFromFile(configurationType, path);
+            }
+            catch (FileNotFoundException)
+            {
+                return Activator.CreateInstance(configurationType);
+            }
+            catch (IOException)
+            {
+                return Activator.CreateInstance(configurationType);
+            }
+            catch (Exception ex)
+            {
+                Logger.ErrorException("Error loading configuration file: {0}", ex, path);
+
+                return Activator.CreateInstance(configurationType);
+            }
+        }
+
+        public void SaveConfiguration(string key, object configuration)
+        {
+            var configurationStore = GetConfigurationStore(key);
+            var configurationType = configurationStore.ConfigurationType;
+
+            if (configuration.GetType() != configurationType)
+            {
+                throw new ArgumentException("Expected configuration type is " + configurationType.Name);
+            }
+
+            var validatingStore = configurationStore as IValidatingConfiguration;
+            if (validatingStore != null)
+            {
+                var currentConfiguration = GetConfiguration(key);
+
+                validatingStore.Validate(currentConfiguration, configuration);
+            }
+
+            EventHelper.FireEventIfNotNull(NamedConfigurationUpdating, this, new ConfigurationUpdateEventArgs
+            {
+                Key = key,
+                NewConfiguration = configuration
+
+            }, Logger);
+
+            _configurations.AddOrUpdate(key, configuration, (k, v) => configuration);
+
+            var path = GetConfigurationFile(key);
+            FileSystem.CreateDirectory(Path.GetDirectoryName(path));
+
+            lock (_configurationSyncLock)
+            {
+                XmlSerializer.SerializeToFile(configuration, path);
+            }
+
+            OnNamedConfigurationUpdated(key, configuration);
+        }
+
+        protected virtual void OnNamedConfigurationUpdated(string key, object configuration)
+        {
+            EventHelper.FireEventIfNotNull(NamedConfigurationUpdated, this, new ConfigurationUpdateEventArgs
+            {
+                Key = key,
+                NewConfiguration = configuration
+
+            }, Logger);
+        }
+
+        public Type GetConfigurationType(string key)
+        {
+            return GetConfigurationStore(key)
+                .ConfigurationType;
+        }
+
+        private ConfigurationStore GetConfigurationStore(string key)
+        {
+            return _configurationStores
+                .First(i => string.Equals(i.Key, key, StringComparison.OrdinalIgnoreCase));
+        }
+    }
+}