From e677a57bf1cedc55214b0e457778311b8f1ea5ac Mon Sep 17 00:00:00 2001
From: Luke Pulverenti <luke.pulverenti@gmail.com>
Date: Mon, 17 Jun 2013 16:35:43 -0400
Subject: switch to flat file storage

---
 .../Persistence/JsonItemRepository.cs              | 235 +++++++++++++++++++++
 1 file changed, 235 insertions(+)
 create mode 100644 MediaBrowser.Server.Implementations/Persistence/JsonItemRepository.cs

(limited to 'MediaBrowser.Server.Implementations/Persistence/JsonItemRepository.cs')

diff --git a/MediaBrowser.Server.Implementations/Persistence/JsonItemRepository.cs b/MediaBrowser.Server.Implementations/Persistence/JsonItemRepository.cs
new file mode 100644
index 0000000000..d0333e334e
--- /dev/null
+++ b/MediaBrowser.Server.Implementations/Persistence/JsonItemRepository.cs
@@ -0,0 +1,235 @@
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Common.IO;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Persistence;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Model.Serialization;
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Server.Implementations.Persistence
+{
+    public class JsonItemRepository : IItemRepository
+    {
+        private readonly ConcurrentDictionary<string, SemaphoreSlim> _fileLocks = new ConcurrentDictionary<string, SemaphoreSlim>();
+
+        private SemaphoreSlim GetLock(string filename)
+        {
+            return _fileLocks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
+        }
+        
+        /// <summary>
+        /// Gets the name of the repository
+        /// </summary>
+        /// <value>The name.</value>
+        public string Name
+        {
+            get
+            {
+                return "Json";
+            }
+        }
+
+        /// <summary>
+        /// Gets the json serializer.
+        /// </summary>
+        /// <value>The json serializer.</value>
+        private readonly IJsonSerializer _jsonSerializer;
+
+        private readonly string _criticReviewsPath;
+
+        private readonly FileSystemRepository _itemRepo;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="JsonUserDataRepository" /> class.
+        /// </summary>
+        /// <param name="appPaths">The app paths.</param>
+        /// <param name="jsonSerializer">The json serializer.</param>
+        /// <param name="logManager">The log manager.</param>
+        /// <exception cref="System.ArgumentNullException">appPaths</exception>
+        public JsonItemRepository(IApplicationPaths appPaths, IJsonSerializer jsonSerializer, ILogManager logManager)
+        {
+            if (appPaths == null)
+            {
+                throw new ArgumentNullException("appPaths");
+            }
+            if (jsonSerializer == null)
+            {
+                throw new ArgumentNullException("jsonSerializer");
+            }
+
+            _jsonSerializer = jsonSerializer;
+
+            _criticReviewsPath = Path.Combine(appPaths.DataPath, "critic-reviews");
+
+            _itemRepo = new FileSystemRepository(Path.Combine(appPaths.DataPath, "library"));
+        }
+
+        /// <summary>
+        /// Opens the connection to the database
+        /// </summary>
+        /// <returns>Task.</returns>
+        public Task Initialize()
+        {
+            return Task.FromResult(true);
+        }
+
+        /// <summary>
+        /// Save a standard item in the repo
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        /// <exception cref="System.ArgumentNullException">item</exception>
+        public async Task SaveItem(BaseItem item, CancellationToken cancellationToken)
+        {
+            if (item == null)
+            {
+                throw new ArgumentNullException("item");
+            }
+
+            if (!Directory.Exists(_criticReviewsPath))
+            {
+                Directory.CreateDirectory(_criticReviewsPath);
+            }
+
+            var path = _itemRepo.GetResourcePath(item.Id + ".json");
+
+            var parentPath = Path.GetDirectoryName(path);
+            if (!Directory.Exists(parentPath))
+            {
+                Directory.CreateDirectory(parentPath);
+            }
+
+            var semaphore = GetLock(path);
+
+            await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
+
+            try
+            {
+                _jsonSerializer.SerializeToFile(item, path);
+            }
+            finally
+            {
+                semaphore.Release();
+            }
+        }
+
+        /// <summary>
+        /// Saves the items.
+        /// </summary>
+        /// <param name="items">The items.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        /// <exception cref="System.ArgumentNullException">
+        /// items
+        /// or
+        /// cancellationToken
+        /// </exception>
+        public Task SaveItems(IEnumerable<BaseItem> items, CancellationToken cancellationToken)
+        {
+            if (items == null)
+            {
+                throw new ArgumentNullException("items");
+            }
+
+            if (cancellationToken == null)
+            {
+                throw new ArgumentNullException("cancellationToken");
+            }
+
+            var tasks = items.Select(i => SaveItem(i, cancellationToken));
+
+            return Task.WhenAll(tasks);
+        }
+
+        /// <summary>
+        /// Retrieves the item.
+        /// </summary>
+        /// <param name="id">The id.</param>
+        /// <param name="type">The type.</param>
+        /// <returns>BaseItem.</returns>
+        /// <exception cref="System.ArgumentNullException">id</exception>
+        public BaseItem RetrieveItem(Guid id, Type type)
+        {
+            if (id == Guid.Empty)
+            {
+                throw new ArgumentNullException("id");
+            }
+
+            var path = _itemRepo.GetResourcePath(id + ".json");
+
+            try
+            {
+                return (BaseItem)_jsonSerializer.DeserializeFromFile(type, path);
+            }
+            catch (IOException)
+            {
+                // File doesn't exist or is currently bring written to
+                return null;
+            }
+        }
+
+        /// <summary>
+        /// Gets the critic reviews.
+        /// </summary>
+        /// <param name="itemId">The item id.</param>
+        /// <returns>Task{IEnumerable{ItemReview}}.</returns>
+        public Task<IEnumerable<ItemReview>> GetCriticReviews(Guid itemId)
+        {
+            return Task.Run<IEnumerable<ItemReview>>(() =>
+            {
+                var path = Path.Combine(_criticReviewsPath, itemId + ".json");
+
+                try
+                {
+                    return _jsonSerializer.DeserializeFromFile<List<ItemReview>>(path);
+                }
+                catch (IOException)
+                {
+                    // File doesn't exist or is currently bring written to
+                    return new List<ItemReview>();
+                }
+            });
+        }
+
+        /// <summary>
+        /// Saves the critic reviews.
+        /// </summary>
+        /// <param name="itemId">The item id.</param>
+        /// <param name="criticReviews">The critic reviews.</param>
+        /// <returns>Task.</returns>
+        public Task SaveCriticReviews(Guid itemId, IEnumerable<ItemReview> criticReviews)
+        {
+            return Task.Run(() =>
+            {
+                if (!Directory.Exists(_criticReviewsPath))
+                {
+                    Directory.CreateDirectory(_criticReviewsPath);
+                }
+
+                var path = Path.Combine(_criticReviewsPath, itemId + ".json");
+
+                _jsonSerializer.SerializeToFile(criticReviews.ToList(), path);
+            });
+        }
+
+        public void Dispose()
+        {
+            // Wait up to two seconds for any existing writes to finish
+            var locks = _fileLocks.Values.ToList()
+                                  .Where(i => i.CurrentCount == 1)
+                                  .Select(i => i.WaitAsync(2000));
+
+            var task = Task.WhenAll(locks);
+
+            Task.WaitAll(task);
+        }
+    }
+}
-- 
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