internal async Task <IncomingMessage> PerformRequestAsync(CancellationToken cancellationToken)
{
int retryCounter = 0;
IncomingMessage reply = null;
var reassembler = new MessageReassembler(ctrl, this);
Debug.WriteLine("timeout is " + waitRetryTimeout.TotalMilliseconds + "ms");
while (retryCounter++ <= retries)
{
// send message
if (await outgoingMsg.SendAsync().ConfigureAwait(false))
{
// if this request is for a reboot, we won't be able to receive the reply right away because the device is rebooting
if ((outgoingMsg.Header.m_cmd == Commands.c_Monitor_Reboot) && retryCounter == 1)
{
// wait here for
Task.Delay(2000).Wait();
}
CancellationTokenSource source = new CancellationTokenSource();
// add a cancellation token to force cancel
var timeoutCancelatioToken = source.Token.AddTimeout(waitRetryTimeout);
// because we have an external cancellation token and the above timeout cancellation token, need to combine both
var linkedCancelationToken = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, timeoutCancelatioToken).Token;
try
{
// need to have a timeout to cancel the process task otherwise it may end up waiting forever for this to return
// because we have an external cancellation token and the above timeout cancellation token, need to combine both
reply = await reassembler.ProcessAsync(linkedCancelationToken).ConfigureAwait(false);
}
catch { }
finally
{
// ALWAYS cancel reassembler task
source.Cancel();
}
if (reply != null)
{
return(reply);
}
}
else
{
// send failed
Debug.WriteLine("SEND FAILED...");
}
// something went wrong, retry with a progressive back-off strategy
Task.Delay(200 * retryCounter).Wait();
}
Debug.WriteLine("exceeded attempts count...");
return(null);
}
internal async Task <IncomingMessage> PerformRequestAsync(CancellationToken cancellationToken)
{
int retryCounter = 0;
IncomingMessage reply;
var reassembler = new MessageReassembler(ctrl, this);
while (retryCounter++ < retries)
{
// send message
if (await outgoingMsg.SendAsync().ConfigureAwait(false))
{
// need to have a timeout to cancel the process task otherwise it may end up waiting forever for this to return
// because we have an external cancellation token and the above timeout cancellation token, need to combine both
reply = await reassembler.ProcessAsync(cancellationToken.AddTimeout(waitRetryTimeout)).ConfigureAwait(false);
if (reply != null)
{
return(reply);
}
}
else
{
// send failed
Debug.WriteLine("SEND FAILED...");
}
// something went wrong, retry with a progressive back-off strategy
await Task.Delay(200 *retryCounter);
}
Debug.WriteLine("exceeded attempts count...");
return(null);
}
internal async Task <IncomingMessage> PerformRequestAsync()
{
int retryCounter = 0;
IncomingMessage reply = null;
var reassembler = new MessageReassembler(ctrl, this);
while (retryCounter++ <= retries)
{
//// TODO add cancel token argument here
//// check for cancelation request
//if (cancellationToken.IsCancellationRequested)
//{
// // cancellation requested
// Debug.WriteLine("cancelation requested");
// return null;
//}
Debug.WriteLine($"Performing {retryCounter}/{ (retries+1) } request attempt with {waitRetryTimeout.TotalMilliseconds}ms");
// create new cancelation token source
CancellationTokenSource cTSource = new CancellationTokenSource();
// send message
// add a cancellation token to force cancel, the send
if (await outgoingMsg.SendAsync(cTSource.Token))
{
// if this request is for a reboot, we won't be able to receive the reply right away because the device is rebooting
if (outgoingMsg.Header.Cmd == Commands.c_Monitor_Reboot)
{
// done here, no reply will come
return(reply);
}
Debug.WriteLine($"Processing reply now...");
// create new cancelation token for reply processor
cTSource = new CancellationTokenSource();
try
{
// need to have a timeout to cancel the process task otherwise it may end up waiting forever for this to return
// because we have an external cancellation token and the above timeout cancellation token, need to combine both
reply = await reassembler.ProcessAsync(cTSource.Token.AddTimeout(waitRetryTimeout));
}
catch (Exception ex)
{
Debug.WriteLine($"Exception occurred: {ex.Message}\r\n {ex.StackTrace}");
// ALWAYS cancel reassembler task on exception
cTSource.Cancel();
}
if (reply != null)
{
return(reply);
}
}
else
{
// send failed
Debug.WriteLine("SEND FAILED...");
}
// something went wrong, retry with a progressive back-off strategy
Task.Delay(200 * retryCounter).Wait();
}
Debug.WriteLine($"Performing request exceeded attempts count...");
return(reply);
}