private void PollingLoop(IConnection connection, string data, System.Action initializeCallback, Action <Exception> errorCallback, bool raiseReconnect)
{
string _url = connection.Url;
var _reconnectTokenSource = new CancellationTokenSource();
int _reconnectFired = 0;
if (connection.MessageId == null)
{
_url += "connect";
}
else if (raiseReconnect)
{
_url += "reconnect";
}
_url += GetReceiveQueryString(connection, data);
//Debug.WriteLine("LongPollingTransport: PollingLoop for [{0}]", _url);
var _signal = m_httpClient.PostAsync(
_url,
PrepareRequest(connection),
new Dictionary <string, string> {
{ "groups", GetSerializedGroups(connection) }
});
_signal.Finished += (sender, e) =>
{
// Clear the pending request
connection.Items.Remove(c_httpRequestKey);
bool _shouldRaiseReconnect = false;
bool _disconnectedReceived = false;
try
{
if (!e.Result.IsFaulted)
{
if (raiseReconnect)
{
// If the timeout for the reconnect hasn't fired as yet just fire the
// event here before any incoming messages are processed
FireReconnected(connection, _reconnectTokenSource, ref _reconnectFired);
}
// Get the response
var _raw = e.Result.ReadAsString();
//Debug.WriteLine("LongPollingTransport: Receive [{0}]", _raw);
if (!String.IsNullOrEmpty(_raw))
{
ProcessResponse(connection, _raw, out _shouldRaiseReconnect, out _disconnectedReceived);
}
}
}
finally
{
if (_disconnectedReceived)
{
connection.Stop();
}
else
{
bool _requestAborted = false;
if (e.Result.IsFaulted)
{
// Cancel the previous reconnect event
_reconnectTokenSource.Cancel();
// Raise the reconnect event if we successfully reconnect after failing
_shouldRaiseReconnect = true;
// Get the underlying exception
Exception exception = e.Result.Exception.GetBaseException();
// If the error callback isn't null then raise it and don't continue polling
if (errorCallback != null)
{
// Raise on error
connection.OnError(exception);
// Call the callback
errorCallback(exception);
}
else
{
// Figure out if the request was aborted
_requestAborted = IsRequestAborted(exception);
// Sometimes a connection might have been closed by the server before we get to write anything
// so just try again and don't raise OnError.
if (!_requestAborted && !(exception is IOException))
{
// Raise on error
connection.OnError(exception);
// If the connection is still active after raising the error event wait for 2 seconds
// before polling again so we aren't hammering the server
Thread.Sleep(m_errorDelay);
if (connection.IsActive)
{
PollingLoop(
connection,
data,
null, // initializeCallback
null, // errorCallback
_shouldRaiseReconnect); // raiseReconnect
}
}
}
}
else
{
// Continue polling if there was no error
if (connection.IsActive)
{
PollingLoop(
connection,
data,
null, // initializeCallback
null, // errorCallback
_shouldRaiseReconnect); // raiseReconnect
}
}
}
}
};
if (initializeCallback != null)
{
initializeCallback();
}
if (raiseReconnect)
{
Thread.Sleep(ReconnectDelay);
// Fire the reconnect event after the delay. This gives the
FireReconnected(connection, _reconnectTokenSource, ref _reconnectFired);
}
}