2015-07-20 20:32:55 +02:00
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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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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2015-10-04 06:23:11 +02:00
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using CommonIO;
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2015-07-20 20:32:55 +02:00
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namespace MediaBrowser.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 object _fileDataLock = new object();
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2016-02-24 06:36:58 +01:00
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private List<T> _items;
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2015-07-20 20:32:55 +02:00
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private readonly IJsonSerializer _jsonSerializer;
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protected readonly ILogger Logger;
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private readonly string _dataPath;
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protected readonly Func<T, T, bool> EqualityComparer;
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2015-09-14 01:07:54 +02:00
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private readonly IFileSystem _fileSystem;
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2015-07-20 20:32:55 +02:00
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2015-09-14 01:07:54 +02:00
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public ItemDataProvider(IFileSystem fileSystem, IJsonSerializer jsonSerializer, ILogger logger, string dataPath, Func<T, T, bool> equalityComparer)
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2015-07-20 20:32:55 +02:00
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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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_jsonSerializer = jsonSerializer;
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2015-09-14 01:07:54 +02:00
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_fileSystem = fileSystem;
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2015-07-20 20:32:55 +02:00
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}
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public IReadOnlyList<T> GetAll()
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{
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2016-02-24 06:36:58 +01:00
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lock (_fileDataLock)
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2015-07-20 20:32:55 +02:00
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{
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2016-02-24 06:36:58 +01:00
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if (_items == null)
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2015-07-20 20:32:55 +02:00
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{
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2016-03-13 08:34:17 +01:00
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Logger.Info("Loading live tv data from {0}", _dataPath);
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2016-02-24 06:36:58 +01:00
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_items = GetItemsFromFile(_dataPath);
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2015-07-20 20:32:55 +02:00
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}
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2016-03-13 08:34:17 +01:00
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return _items.ToList();
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2015-07-20 20:32:55 +02:00
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}
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}
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private List<T> GetItemsFromFile(string path)
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{
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var jsonFile = path + ".json";
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try
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{
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2016-03-13 04:30:23 +01:00
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return _jsonSerializer.DeserializeFromFile<List<T>>(jsonFile) ?? new List<T>();
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2015-07-20 20:32:55 +02:00
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}
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catch (FileNotFoundException)
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{
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}
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catch (DirectoryNotFoundException ex)
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{
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}
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catch (IOException ex)
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{
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Logger.ErrorException("Error deserializing {0}", ex, jsonFile);
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error deserializing {0}", ex, jsonFile);
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}
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return new List<T>();
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}
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private void UpdateList(List<T> newList)
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{
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2016-03-13 04:30:23 +01:00
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if (newList == null)
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{
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throw new ArgumentNullException("newList");
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}
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2015-07-24 01:40:54 +02:00
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var file = _dataPath + ".json";
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2015-11-21 05:55:26 +01:00
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_fileSystem.CreateDirectory(Path.GetDirectoryName(file));
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2015-07-24 01:40:54 +02:00
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2015-07-20 20:32:55 +02:00
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lock (_fileDataLock)
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{
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2015-07-24 01:40:54 +02:00
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_jsonSerializer.SerializeToFile(newList, file);
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2015-07-20 20:32:55 +02:00
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_items = newList;
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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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2016-03-13 04:30:23 +01:00
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if (item == null)
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{
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throw new ArgumentNullException("item");
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}
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2015-07-20 20:32:55 +02:00
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var list = GetAll().ToList();
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var index = list.FindIndex(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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list[index] = item;
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UpdateList(list);
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}
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public virtual void Add(T item)
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{
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2016-03-13 04:30:23 +01:00
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if (item == null)
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{
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throw new ArgumentNullException("item");
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}
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2015-07-20 20:32:55 +02:00
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var list = GetAll().ToList();
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if (list.Any(i => EqualityComparer(i, item)))
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{
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throw new ArgumentException("item already exists");
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}
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list.Add(item);
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UpdateList(list);
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}
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2015-11-18 05:18:51 +01:00
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public void AddOrUpdate(T item)
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{
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var list = GetAll().ToList();
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if (!list.Any(i => EqualityComparer(i, item)))
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{
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Add(item);
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}
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else
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{
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Update(item);
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}
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}
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2015-11-21 05:55:26 +01:00
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2015-07-20 20:32:55 +02:00
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public virtual void Delete(T item)
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{
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var list = GetAll().Where(i => !EqualityComparer(i, item)).ToList();
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UpdateList(list);
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}
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}
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}
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