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using System.IO;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.Events;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Serialization;
using System;
using System.Threading;
namespace MediaBrowser.Common.Implementations.Configuration
{
/// <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>
/// 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; }
/// <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));
return _configuration;
}
protected set
{
_configuration = value;
_configurationLoaded = value != null;
}
}
/// <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)
{
CommonApplicationPaths = applicationPaths;
XmlSerializer = xmlSerializer;
Logger = logManager.GetLogger(GetType().Name);
UpdateCachePath();
}
/// <summary>
/// The _save lock
/// </summary>
private readonly object _configurationSaveLock = new object();
/// <summary>
/// Saves the configuration.
/// </summary>
public void SaveConfiguration()
{
var path = CommonApplicationPaths.SystemConfigurationFilePath;
Directory.CreateDirectory(Path.GetDirectoryName(path));
lock (_configurationSaveLock)
{
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()
{
((BaseApplicationPaths)CommonApplicationPaths).CachePath = string.IsNullOrEmpty(CommonConfiguration.CachePath) ?
null :
CommonConfiguration.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 (!Directory.Exists(newPath))
{
throw new DirectoryNotFoundException(string.Format("{0} does not exist.", newPath));
}
}
}
}
}
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