jellyfin-server/Emby.Server.Implementations/LiveTv/EmbyTV/ItemDataProvider.cs

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using System;
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using System.Collections.Generic;
using System.IO;
using System.Linq;
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using MediaBrowser.Model.IO;
using MediaBrowser.Model.Serialization;
using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.LiveTv.EmbyTV
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{
public class ItemDataProvider<T>
where T : class
{
private readonly object _fileDataLock = new object();
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private List<T> _items;
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private readonly IJsonSerializer _jsonSerializer;
protected readonly ILogger Logger;
private readonly string _dataPath;
protected readonly Func<T, T, bool> EqualityComparer;
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private readonly IFileSystem _fileSystem;
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public ItemDataProvider(IFileSystem fileSystem, IJsonSerializer jsonSerializer, ILogger logger, string dataPath, Func<T, T, bool> equalityComparer)
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{
Logger = logger;
_dataPath = dataPath;
EqualityComparer = equalityComparer;
_jsonSerializer = jsonSerializer;
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_fileSystem = fileSystem;
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}
public IReadOnlyList<T> GetAll()
{
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lock (_fileDataLock)
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{
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if (_items == null)
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{
Logger.LogInformation("Loading live tv data from {0}", _dataPath);
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_items = GetItemsFromFile(_dataPath);
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}
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return _items.ToList();
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}
}
private List<T> GetItemsFromFile(string path)
{
var jsonFile = path + ".json";
try
{
return _jsonSerializer.DeserializeFromFile<List<T>>(jsonFile) ?? new List<T>();
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}
catch (FileNotFoundException)
{
}
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catch (IOException)
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{
}
catch (Exception ex)
{
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Logger.LogError(ex, "Error deserializing {jsonFile}", jsonFile);
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}
return new List<T>();
}
private void UpdateList(List<T> newList)
{
if (newList == null)
{
throw new ArgumentNullException(nameof(newList));
}
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var file = _dataPath + ".json";
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_fileSystem.CreateDirectory(_fileSystem.GetDirectoryName(file));
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lock (_fileDataLock)
{
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_jsonSerializer.SerializeToFile(newList, file);
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_items = newList;
}
}
public virtual void Update(T item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
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var list = GetAll().ToList();
var index = list.FindIndex(i => EqualityComparer(i, item));
if (index == -1)
{
throw new ArgumentException("item not found");
}
list[index] = item;
UpdateList(list);
}
public virtual void Add(T item)
{
if (item == null)
{
throw new ArgumentNullException(nameof(item));
}
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var list = GetAll().ToList();
if (list.Any(i => EqualityComparer(i, item)))
{
throw new ArgumentException("item already exists");
}
list.Add(item);
UpdateList(list);
}
public void AddOrUpdate(T item)
{
var list = GetAll().ToList();
if (!list.Any(i => EqualityComparer(i, item)))
{
Add(item);
}
else
{
Update(item);
}
}
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public virtual void Delete(T item)
{
var list = GetAll().Where(i => !EqualityComparer(i, item)).ToList();
UpdateList(list);
}
}
}