/// <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);
}
