/// <summary> /// Assigns a new server driver to the connection object /// </summary> /// <param name="groupName">Group name</param> /// <param name="master">True if the server connection to assign must be a master</param> /// <param name="connection">MyCatConnection object where the new driver will be assigned</param> internal static void GetNewConnection(string groupName, bool master, MyCatConnection connection) { do { lock (thisLock) { if (!IsReplicationGroup(groupName)) { return; } ReplicationServerGroup group = GetGroup(groupName); ReplicationServer server = group.GetServer(master, connection.Settings); if (server == null) { throw new MyCatException(Properties.Resources.Replication_NoAvailableServer); } try { bool isNewServer = false; if (connection.driver == null || !connection.driver.IsOpen) { isNewServer = true; } else { MyCatConnectionStringBuilder msb = new MyCatConnectionStringBuilder(server.ConnectionString); if (!msb.Equals(connection.driver.Settings)) { isNewServer = true; } } if (isNewServer) { Driver driver = Driver.Create(new MyCatConnectionStringBuilder(server.ConnectionString)); connection.driver = driver; } return; } catch (MyCatException ex) { connection.driver = null; server.IsAvailable = false; MyCatTrace.LogError(ex.Number, ex.ToString()); if (ex.Number == 1042) { // retry to open a failed connection and update its status group.HandleFailover(server, ex); } else { throw; } } } } while (true); }
/// <summary> /// Handles a failed connection to a server. /// This method can be overrided to implement a custom failover handling /// </summary> /// <param name="server">The failed server</param> internal protected virtual void HandleFailover(ReplicationServer server) { BackgroundWorker worker = new BackgroundWorker(); worker.DoWork += delegate(object sender, DoWorkEventArgs e) { bool isRunning = false; ReplicationServer server1 = e.Argument as ReplicationServer; #if !RT System.Timers.Timer timer = new System.Timers.Timer(RetryTime * 1000.0); System.Timers.ElapsedEventHandler elapsedEvent = delegate(object sender1, System.Timers.ElapsedEventArgs e1) { if (isRunning) { return; } try { isRunning = true; using (MyCatConnection connectionFailed = new MyCatConnection(server.ConnectionString)) { connectionFailed.Open(); server1.IsAvailable = true; timer.Stop(); } } catch { MyCatTrace.LogWarning(0, string.Format(Properties.Resources.Replication_ConnectionAttemptFailed, server1.Name)); } finally { isRunning = false; } }; timer.Elapsed += elapsedEvent; timer.Start(); elapsedEvent(sender, null); #else Windows.UI.Xaml.DispatcherTimer timer = new Windows.UI.Xaml.DispatcherTimer(); TimeSpan ts = new TimeSpan(RetryTime * 1000); System.EventHandler <object> elapsedEvent = (TickSender, TickEventArgs) => { if (isRunning) { return; } try { isRunning = true; using (MyCatConnection connectionFailed = new MyCatConnection(server.ConnectionString)) { connectionFailed.Open(); server1.IsAvailable = true; timer.Stop(); } } catch { MyCatTrace.LogWarning(0, string.Format(Properties.Resources.Replication_ConnectionAttemptFailed, server1.Name)); } finally { isRunning = false; } }; timer.Tick += elapsedEvent; elapsedEvent(sender, null); timer.Start(); #endif }; worker.RunWorkerAsync(server); }