mirror of
https://github.com/jellyfin/jellyfin.git
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163 lines
4.2 KiB
C#
163 lines
4.2 KiB
C#
#nullable disable
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#pragma warning disable CS1591
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text.Json;
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using Jellyfin.Extensions.Json;
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using Microsoft.Extensions.Logging;
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namespace Emby.Server.Implementations.LiveTv.EmbyTV
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{
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public class ItemDataProvider<T>
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where T : class
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{
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private readonly string _dataPath;
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private readonly object _fileDataLock = new object();
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private readonly JsonSerializerOptions _jsonOptions = JsonDefaults.Options;
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private T[] _items;
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public ItemDataProvider(
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ILogger logger,
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string dataPath,
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Func<T, T, bool> equalityComparer)
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{
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Logger = logger;
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_dataPath = dataPath;
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EqualityComparer = equalityComparer;
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}
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protected ILogger Logger { get; }
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protected Func<T, T, bool> EqualityComparer { get; }
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private void EnsureLoaded()
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{
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if (_items != null)
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{
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return;
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}
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if (File.Exists(_dataPath))
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{
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Logger.LogInformation("Loading live tv data from {Path}", _dataPath);
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try
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{
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var bytes = File.ReadAllBytes(_dataPath);
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_items = JsonSerializer.Deserialize<T[]>(bytes, _jsonOptions);
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return;
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}
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catch (JsonException ex)
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{
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Logger.LogError(ex, "Error deserializing {Path}", _dataPath);
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}
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}
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_items = Array.Empty<T>();
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}
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private void SaveList()
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{
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Directory.CreateDirectory(Path.GetDirectoryName(_dataPath));
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var jsonString = JsonSerializer.Serialize(_items, _jsonOptions);
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File.WriteAllText(_dataPath, jsonString);
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}
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public IReadOnlyList<T> GetAll()
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{
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lock (_fileDataLock)
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{
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EnsureLoaded();
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return (T[])_items.Clone();
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}
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}
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public virtual void Update(T item)
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{
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if (item == null)
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{
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throw new ArgumentNullException(nameof(item));
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}
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lock (_fileDataLock)
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{
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EnsureLoaded();
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var index = Array.FindIndex(_items, i => EqualityComparer(i, item));
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if (index == -1)
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{
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throw new ArgumentException("item not found");
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}
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_items[index] = item;
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SaveList();
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}
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}
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public virtual void Add(T item)
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{
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if (item == null)
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{
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throw new ArgumentNullException(nameof(item));
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}
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lock (_fileDataLock)
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{
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EnsureLoaded();
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if (_items.Any(i => EqualityComparer(i, item)))
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{
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throw new ArgumentException("item already exists", nameof(item));
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}
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int oldLen = _items.Length;
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var newList = new T[oldLen + 1];
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_items.CopyTo(newList, 0);
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newList[oldLen] = item;
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_items = newList;
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SaveList();
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}
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}
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public virtual void AddOrUpdate(T item)
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{
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lock (_fileDataLock)
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{
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EnsureLoaded();
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int index = Array.FindIndex(_items, i => EqualityComparer(i, item));
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if (index == -1)
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{
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int oldLen = _items.Length;
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var newList = new T[oldLen + 1];
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_items.CopyTo(newList, 0);
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newList[oldLen] = item;
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_items = newList;
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}
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else
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{
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_items[index] = item;
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}
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SaveList();
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}
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}
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public virtual void Delete(T item)
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{
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lock (_fileDataLock)
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{
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EnsureLoaded();
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_items = _items.Where(i => !EqualityComparer(i, item)).ToArray();
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SaveList();
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}
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}
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}
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}
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