private void HandleConnectionException(Exception ex)
{
var oldFactory = ConnectionFactory;
var nextFactory = _connectionFactories.GetNext();
if (++_nodeTried < _connectionFactories.All.Count())
{
_watcher.ErrorFormat("Failed to connect to Broker: '{0}:{1}', VHost: '{2}'. Failing over to '{3}:{4}'\nExceptionMessage: {5}",
oldFactory.HostName,
oldFactory.Port,
oldFactory.VirtualHost,
nextFactory.HostName,
nextFactory.Port,
ex.Message);
Connect();
}
else
{
_watcher.ErrorFormat("Failed to connect to Broker: '{0}:{1}', VHost: '{2}'. Failing over to '{3}{4}' after {5}ms\nExceptionMessage: {6}",
oldFactory.HostName,
oldFactory.Port,
oldFactory.VirtualHost,
nextFactory.HostName,
nextFactory.Port,
_retryPolicy.DelayTime,
ex.Message);
_retryPolicy.WaitForNextRetry(Connect);
}
}
/// <summary>
/// Initialize a <see cref="HaConnection"/> with a list of <see cref="ManagedConnectionFactory"/>
/// These connection factories are responsibile for creating <see cref="IConnection"/> to nodes in the clusters
/// </summary>
/// <param name="retryPolicy"></param>
/// <param name="watcher"></param>
/// <param name="connectionFactories"></param>
public HaConnection(IRetryPolicy retryPolicy, IRabbitWatcher watcher, IList <ManagedConnectionFactory> connectionFactories) : base(retryPolicy, watcher)
{
_connectionFactories = new RoundRobinList <ConnectionFactory>(connectionFactories);
ConnectionEstablished handler = (endpoint, virtualHost) =>
{
if (_connectionFactories.All.Any(f => f.Endpoint + f.VirtualHost == endpoint + virtualHost))
{
if (!IsConnected)
{
while (_connectionFactories.Current.Endpoint + _connectionFactories.Current.VirtualHost != endpoint + virtualHost)
{
//IF there are 2 different Tunnels using 2 HaConnection with 2 lists of cluster nodes in different orders:
//Example:
// ConnectionString1: host=q1;username=guest;password=guest|host=q2;username=guest;password=guest|host=q3;username=guest;password=guest
// ConnectionString2: host=q2;username=guest;password=guest|host=q3;username=guest;password=guest|host=q1;username=guest;password=guest
// When the first tunnel established the connection successfully to q1, it fires event and these lines of code is triggered.
// The 2nd HaConnection needs to set it's _connectionFactories.Current to q1 established by other tunnel. Before changing, _connectionFactories.Current is q3 by the order in the ConnectionString2
_connectionFactories.GetNext();
}
}
FireConnectedEvent();
}
};
ManagedConnectionFactory.ConnectionEstablished += handler;
_unsubscribeEvents = () => { ManagedConnectionFactory.ConnectionEstablished -= handler; };
}
