protected IObservable <T> GetResilientStream <T>(Func <IConnection, IObservable <T> > streamFactory, TimeSpan connectionTimeout)
{
var activeConnections = (from connection in _connectionProvider.GetActiveConnection()
from status in connection.StatusStream
where status.ConnectionStatus == ConnectionStatus.Connected || status.ConnectionStatus == ConnectionStatus.Reconnected
select connection)
.Publish()
.RefCount();
// get the first connection
var firstConnection = activeConnections.Take(1).Timeout(connectionTimeout);
// 1 - notifies when the first connection gets disconnected
var firstDisconnection = from connection in firstConnection
from status in connection.StatusStream
where status.ConnectionStatus == ConnectionStatus.Reconnecting || status.ConnectionStatus == ConnectionStatus.Closed
select Unit.Default;
// 2- connection provider created a new connection it means the active one has droped
var subsequentConnection = activeConnections.Skip(1).Select(_ => Unit.Default).Take(1);
// OnError when we get 1 or 2
var disconnected = firstDisconnection.Merge(subsequentConnection)
.Select(_ => Notification.CreateOnError <T>(new Exception("Connection was closed.")))
.Dematerialize();
// create a stream which will OnError as soon as the connection drops
return((from connection in firstConnection
from t in streamFactory(connection)
select t)
.Merge(disconnected)
.Publish()
.RefCount());
}
