sqlite

MediaBrowser.Server.Implementations/Persistence/SqliteItemRepository.cs

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+using MediaBrowser.Common.Configuration;
+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.Generic;
+using System.Data;
+using System.Data.SQLite;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Server.Implementations.Persistence
+{
+    /// <summary>
+    /// Class SQLiteItemRepository
+    /// </summary>
+    public class SqliteItemRepository : SqliteRepository, IItemRepository
+    {
+        /// <summary>
+        /// The repository name
+        /// </summary>
+        public const string RepositoryName = "SQLite";
+
+        /// <summary>
+        /// Gets the name of the repository
+        /// </summary>
+        /// <value>The name.</value>
+        public string Name
+        {
+            get
+            {
+                return RepositoryName;
+            }
+        }
+
+        /// <summary>
+        /// Gets the json serializer.
+        /// </summary>
+        /// <value>The json serializer.</value>
+        private readonly IJsonSerializer _jsonSerializer;
+
+        /// <summary>
+        /// The _app paths
+        /// </summary>
+        private readonly IApplicationPaths _appPaths;
+
+        /// <summary>
+        /// The _save item command
+        /// </summary>
+        private SQLiteCommand _saveItemCommand;
+
+        private readonly string _criticReviewsPath;
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SqliteItemRepository"/> 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
+        /// or
+        /// jsonSerializer
+        /// </exception>
+        public SqliteItemRepository(IApplicationPaths appPaths, IJsonSerializer jsonSerializer, ILogManager logManager)
+            : base(logManager)
+        {
+            if (appPaths == null)
+            {
+                throw new ArgumentNullException("appPaths");
+            }
+            if (jsonSerializer == null)
+            {
+                throw new ArgumentNullException("jsonSerializer");
+            }
+
+            _appPaths = appPaths;
+            _jsonSerializer = jsonSerializer;
+
+            _criticReviewsPath = Path.Combine(_appPaths.DataPath, "critic-reviews");
+        }
+
+        /// <summary>
+        /// Opens the connection to the database
+        /// </summary>
+        /// <returns>Task.</returns>
+        public async Task Initialize()
+        {
+            var dbFile = Path.Combine(_appPaths.DataPath, "library.db");
+
+            await ConnectToDb(dbFile).ConfigureAwait(false);
+
+            string[] queries = {
+
+                                "create table if not exists baseitems (guid GUID primary key, data BLOB)",
+                                "create index if not exists idx_baseitems on baseitems(guid)",
+                                "create table if not exists schema_version (table_name primary key, version)",
+                                //pragmas
+                                "pragma temp_store = memory"
+                               };
+
+            RunQueries(queries);
+
+            PrepareStatements();
+        }
+
+        /// <summary>
+        /// The _write lock
+        /// </summary>
+        private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1, 1);
+
+        /// <summary>
+        /// Prepares the statements.
+        /// </summary>
+        private void PrepareStatements()
+        {
+            _saveItemCommand = new SQLiteCommand
+            {
+                CommandText = "replace into baseitems (guid, data) values (@1, @2)"
+            };
+
+            _saveItemCommand.Parameters.Add(new SQLiteParameter("@1"));
+            _saveItemCommand.Parameters.Add(new SQLiteParameter("@2"));
+        }
+
+        /// <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 Task SaveItem(BaseItem item, CancellationToken cancellationToken)
+        {
+            if (item == null)
+            {
+                throw new ArgumentNullException("item");
+            }
+
+            return SaveItems(new[] { item }, cancellationToken);
+        }
+
+        /// <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 async Task SaveItems(IEnumerable<BaseItem> items, CancellationToken cancellationToken)
+        {
+            if (items == null)
+            {
+                throw new ArgumentNullException("items");
+            }
+
+            if (cancellationToken == null)
+            {
+                throw new ArgumentNullException("cancellationToken");
+            }
+
+            cancellationToken.ThrowIfCancellationRequested();
+
+            await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
+
+            SQLiteTransaction transaction = null;
+
+            try
+            {
+                transaction = Connection.BeginTransaction();
+
+                foreach (var item in items)
+                {
+                    cancellationToken.ThrowIfCancellationRequested();
+
+                    _saveItemCommand.Parameters[0].Value = item.Id;
+                    _saveItemCommand.Parameters[1].Value = _jsonSerializer.SerializeToBytes(item);
+
+                    _saveItemCommand.Transaction = transaction;
+
+                    await _saveItemCommand.ExecuteNonQueryAsync(cancellationToken);
+                }
+
+                transaction.Commit();
+            }
+            catch (OperationCanceledException)
+            {
+                if (transaction != null)
+                {
+                    transaction.Rollback();
+                }
+
+                throw;
+            }
+            catch (Exception e)
+            {
+                Logger.ErrorException("Failed to save items:", e);
+
+                if (transaction != null)
+                {
+                    transaction.Rollback();
+                }
+
+                throw;
+            }
+            finally
+            {
+                if (transaction != null)
+                {
+                    transaction.Dispose();
+                }
+
+                _writeLock.Release();
+            }
+        }
+
+        /// <summary>
+        /// Internal retrieve from items or users table
+        /// </summary>
+        /// <param name="id">The id.</param>
+        /// <param name="type">The type.</param>
+        /// <returns>BaseItem.</returns>
+        /// <exception cref="System.ArgumentNullException">id</exception>
+        /// <exception cref="System.ArgumentException"></exception>
+        public BaseItem RetrieveItem(Guid id, Type type)
+        {
+            if (id == Guid.Empty)
+            {
+                throw new ArgumentNullException("id");
+            }
+
+            using (var cmd = Connection.CreateCommand())
+            {
+                cmd.CommandText = "select data from baseitems where guid = @guid";
+                var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
+                guidParam.Value = id;
+
+                using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult | CommandBehavior.SingleRow))
+                {
+                    if (reader.Read())
+                    {
+                        using (var stream = GetStream(reader, 0))
+                        {
+                            return _jsonSerializer.DeserializeFromStream(stream, type) as BaseItem;
+                        }
+                    }
+                }
+                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>>(() =>
+            {
+
+                try
+                {
+                    var path = Path.Combine(_criticReviewsPath, itemId + ".json");
+
+                    return _jsonSerializer.DeserializeFromFile<List<ItemReview>>(path);
+                }
+                catch (DirectoryNotFoundException)
+                {
+                    return new List<ItemReview>();
+                }
+                catch (FileNotFoundException)
+                {
+                    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);
+            });
+        }
+    }
+}