rework repo disposal

MediaBrowser.Server.Implementations/Persistence/BaseSqliteRepository.cs

@@ -0,0 +1,56 @@
+using MediaBrowser.Model.Logging;
+using System;
+using System.Threading;
+
+namespace MediaBrowser.Server.Implementations.Persistence
+{
+    public abstract class BaseSqliteRepository : IDisposable
+    {
+        protected readonly SemaphoreSlim WriteLock = new SemaphoreSlim(1, 1);
+        protected ILogger Logger;
+
+        protected BaseSqliteRepository(ILogManager logManager)
+        {
+            Logger = logManager.GetLogger(GetType().Name);
+        }
+
+        public void Dispose()
+        {
+            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 DisposeInternal()
+        {
+
+        }
+
+        protected abstract void CloseConnection();
+    }
+}