public override Task Send(IConnection connection, string data, string connectionData)
{
if (connection == null)
{
throw new ArgumentNullException("connection");
}
var webSocket = _webSocket;
if (webSocket == null)
{
Exception ex;
if (connection.State != ConnectionState.Disconnected)
{
// Make this a faulted task and trigger the OnError even to maintain consistency with the HttpBasedTransports
ex = new InvalidOperationException(ResourcesStore.GetResourceString("Error_DataCannotBeSentDuringWebSocketReconnect"));
connection.OnError(ex);
}
else
{
ex = new InvalidOperationException(ResourcesStore.GetResourceString("Error_DataCannotBeSentDuringWebSocketReconnect"));
}
var tcs = new DispatchingTaskCompletionSource <object>();
tcs.SetException(ex);
return(tcs.Task);
}
return(Send(webSocket, data));
}
private void ResolveTransport(IConnection connection, string data, CancellationToken disconnectToken, DispatchingTaskCompletionSource <object> tcs, int index)
{
// Pick the current transport
IClientTransport transport = _transports[index];
transport.Start(connection, data, disconnectToken).ContinueWith(task =>
{
if (task.IsFaulted || task.IsCanceled)
{
Exception ex;
if (task.IsCanceled)
{
ex = new OperationCanceledException(Resources.Error_TaskCancelledException);
}
else
{
ex = task.Exception.GetBaseException();
}
connection.Trace(TraceLevels.Events, "Auto: Failed to connect to using transport {0}. {1}", transport.Name, ex);
// If that transport fails to initialize, then fallback.
// If it is that /start request that failed, do not fallback.
var next = index + 1;
if (next < _transports.Count && !(ex is StartException))
{
// Try the next transport
ResolveTransport(connection, data, disconnectToken, tcs, next);
}
else
{
// If there's nothing else to try then just fail
tcs.SetException(ex);
}
}
else
{
// Set the active transport
_transport = transport;
// Complete the process
tcs.SetResult(null);
}
},
TaskContinuationOptions.ExecuteSynchronously);
}
