begin to rework repositories

Emby.Server.Implementations/Data/BaseSqliteRepository.cs

@@ -0,0 +1,123 @@
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Model.Logging;
+using SQLitePCL.pretty;
+
+namespace Emby.Server.Implementations.Data
+{
+    public abstract class BaseSqliteRepository : IDisposable
+    {
+        protected string DbFilePath { get; set; }
+        protected SemaphoreSlim WriteLock = new SemaphoreSlim(1, 1);
+        protected ILogger Logger { get; private set; }
+
+        protected BaseSqliteRepository(ILogger logger)
+        {
+            Logger = logger;
+        }
+
+        protected virtual bool EnableConnectionPooling
+        {
+            get { return true; }
+        }
+
+        protected virtual SQLiteDatabaseConnection CreateConnection(bool isReadOnly = false)
+        {
+            SQLite3.EnableSharedCache = false;
+
+            ConnectionFlags connectionFlags;
+
+            if (isReadOnly)
+            {
+                connectionFlags = ConnectionFlags.ReadOnly;
+                //connectionFlags = ConnectionFlags.Create;
+                //connectionFlags |= ConnectionFlags.ReadWrite;
+            }
+            else
+            {
+                connectionFlags = ConnectionFlags.Create;
+                connectionFlags |= ConnectionFlags.ReadWrite;
+            }
+
+            if (EnableConnectionPooling)
+            {
+                connectionFlags |= ConnectionFlags.SharedCached;
+            }
+            else
+            {
+                connectionFlags |= ConnectionFlags.PrivateCache;
+            }
+
+            connectionFlags |= ConnectionFlags.NoMutex;
+
+            var db = SQLite3.Open(DbFilePath, connectionFlags, null);
+
+            var queries = new[]
+            {
+                "PRAGMA page_size=4096",
+                "PRAGMA journal_mode=WAL",
+                "PRAGMA temp_store=memory",
+                "PRAGMA synchronous=Normal",
+                //"PRAGMA cache size=-10000"
+                };
+
+            //foreach (var query in queries)
+            //{
+            //    db.Execute(query);
+            //}
+
+            db.ExecuteAll(string.Join(";", queries));
+
+            return db;
+        }
+
+        private bool _disposed;
+        protected void CheckDisposed()
+        {
+            if (_disposed)
+            {
+                throw new ObjectDisposedException(GetType().Name + " has been disposed and cannot be accessed.");
+            }
+        }
+
+        public void Dispose()
+        {
+            _disposed = true;
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        private readonly object _disposeLock = new object();
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool dispose)
+        {
+            if (dispose)
+            {
+                try
+                {
+                    lock (_disposeLock)
+                    {
+                        WriteLock.Wait();
+
+                        CloseConnection();
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Logger.ErrorException("Error disposing database", ex);
+                }
+            }
+        }
+
+        protected virtual void CloseConnection()
+        {
+
+        }
+    }
+}