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using MediaBrowser.Common.IO;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Logging;
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.LocalMetadata
{
public abstract class BaseXmlProvider<T> : ILocalMetadataProvider<T>, IHasChangeMonitor
where T : IHasMetadata, new()
{
protected IFileSystem FileSystem;
public async Task<LocalMetadataResult<T>> GetMetadata(ItemInfo info, CancellationToken cancellationToken)
{
var result = new LocalMetadataResult<T>();
var file = GetXmlFile(info, new DirectoryService(new NullLogger()));
if (file == null)
{
return result;
}
var path = file.FullName;
await XmlProviderUtils.XmlParsingResourcePool.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
result.Item = new T();
Fetch(result, path, cancellationToken);
result.HasMetadata = true;
}
catch (FileNotFoundException)
{
result.HasMetadata = false;
}
catch (DirectoryNotFoundException)
{
result.HasMetadata = false;
}
finally
{
XmlProviderUtils.XmlParsingResourcePool.Release();
}
return result;
}
protected abstract void Fetch(LocalMetadataResult<T> result, string path, CancellationToken cancellationToken);
protected BaseXmlProvider(IFileSystem fileSystem)
{
FileSystem = fileSystem;
}
protected abstract FileSystemInfo GetXmlFile(ItemInfo info, IDirectoryService directoryService);
public bool HasChanged(IHasMetadata item, IDirectoryService directoryService, DateTime date)
{
var file = GetXmlFile(new ItemInfo { IsInMixedFolder = item.IsInMixedFolder, Path = item.Path }, directoryService);
if (file == null)
{
return false;
}
return file.Exists && FileSystem.GetLastWriteTimeUtc(file) > date;
}
public string Name
{
get
{
return "Media Browser Xml";
}
}
}
static class XmlProviderUtils
{
internal static readonly SemaphoreSlim XmlParsingResourcePool = new SemaphoreSlim(4, 4);
}
}
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