private void DataSource_DataAcquired(object sender, DataMessageEventArgs e)
{
try
{
// lock to prevent multiple simultaneous calls to the data channel from different threads
lock (_locker)
{
_logger.Trace("Received data from the data source: {0}", e.DataMessage.DataType);
if (_dataChannel != null && _dataChannel.IsConnected)
{
// for some messages, we need to do some clean-up here.
// explanation: we use two separate sockets to transfer data: TCP and UDP.
// some data messages require a logical sequence, e.g. PinchComplete must always occur after the last Pinch.
// the problem is that for performance reasons, data messages like Pinch are sent using UDP, whereas
// all "Complete" messages are sent using TCP (because their delivery must be guaranteed). This can lead
// to the situation that Pinch messages arrive _after_ PinchComplete messages on the server side.
// we avoid this here by purging all queued messages of a certain kind if we are about to send a corresponding
// "Complete" message.
switch (e.DataMessage.DataType)
{
case DataType.CustomDragComplete:
_dataChannel.PurgeFromQueue(DataType.CustomDrag);
break;
case DataType.DragComplete:
_dataChannel.PurgeFromQueue(DataType.FreeDrag);
_dataChannel.PurgeFromQueue(DataType.HorizontalDrag);
_dataChannel.PurgeFromQueue(DataType.VerticalDrag);
break;
case DataType.PinchComplete:
_dataChannel.PurgeFromQueue(DataType.Pinch);
break;
}
// now actually send the message
_dataChannel.Send(e.DataMessage);
}
}
}
catch (Exception ex)
{
State = PhoneControllerState.Error;
RaiseErrorEvent("Error while processing and sending acquired data: " + ex.Message, ex);
}
}
private void DataChannel_DataMessageReceived(object sender, DataMessageEventArgs e)
{
// do not report data if we are not ready
// (e.g. data may still drop in if the client version does not match the
// expected version and we've transitioned to Error state already,
// and until the consumer of the library does something like shutting down).
if (State != PhoneControllerState.Ready)
{
return;
}
_logger.Trace("Received DataMessageReceived event from data channel");
// check if we have a controller info data message
if (e.DataMessage.DataType == DataType.ControllerInfo)
{
// make sure that the version information fits what we expect
var controllerInfoData = e.DataMessage as ControllerInfoData;
if (controllerInfoData.ClientVersion != Constants.ControllerVersion)
{
_logger.Trace("Client controller version {0} does not match expected version {1}.", controllerInfoData.ClientVersion, Constants.ControllerVersion);
State = PhoneControllerState.Error;
var error = new ControllerVersionMismatchException(Constants.ControllerVersion, controllerInfoData.ClientVersion);
RaiseErrorEvent(error);
return;
}
}
// simply pass through
RaiseDataMessageReceivedEvent(e.DataMessage);
}