jellyfin/MediaBrowser.Providers/BaseXmlProvider.cs
2014-02-05 23:39:16 -05:00

84 lines
2.1 KiB
C#

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