private void SendHttpRequest()
{
// Tie the transport method to the ControlChannelTrigger object to push enable it.
// Note that if the transport's TCP connection is broken at a later point of time,
// the ControlChannelTrigger object can be reused to plug in a new transport by
// calling UsingTransport again.
Diag.DebugPrint("Calling UsingTransport() ...");
channel.UsingTransport(httpRequest);
// Call the SendRequestAsync function to kick start the TCP connection establishment
// process for this HTTP request.
Diag.DebugPrint("Calling SendRequestAsync() ...");
sendRequestOperation = httpClient.SendRequestAsync(httpRequest, HttpCompletionOption.ResponseHeadersRead);
sendRequestOperation.Completed += OnSendRequestCompleted;
// Call WaitForPushEnabled API to make sure the TCP connection has been established,
// which will mean that the OS will have allocated any hardware or software slot for this TCP connection.
ControlChannelTriggerStatus status = channel.WaitForPushEnabled();
Diag.DebugPrint("WaitForPushEnabled() completed with status: " + status);
if (status != ControlChannelTriggerStatus.HardwareSlotAllocated &&
status != ControlChannelTriggerStatus.SoftwareSlotAllocated)
{
throw new Exception("Hardware/Software slot not allocated");
}
Diag.DebugPrint("Transport is ready to read response from server.");
}
private void SendHttpRequest()
{
if (httpRequest == null)
{
throw new Exception("HttpRequest object is null");
}
// Tie the transport method to the controlchanneltrigger object to push enable it.
// Note that if the transport's TCP connection is broken at a later point of time,
// the controlchanneltrigger object can be reused to plugin a new transport by
// calling UsingTransport API again.
Diag.DebugPrint("Calling UsingTransport() ...");
channel.UsingTransport(httpRequest);
// Call the SendAsync function to kick start the TCP connection establishment
// process for this http request.
Task <HttpResponseMessage> httpResponseTask = httpClient.SendAsync(httpRequest);
// Call WaitForPushEnabled API to make sure the TCP connection has been established,
// which will mean that the OS will have allocated any hardware slot for this TCP connection.
ControlChannelTriggerStatus status = channel.WaitForPushEnabled();
Diag.DebugPrint("WaitForPushEnabled() completed with status: " + status);
if (status != ControlChannelTriggerStatus.HardwareSlotAllocated &&
status != ControlChannelTriggerStatus.SoftwareSlotAllocated)
{
throw new Exception("Hardware/Software slot not allocated");
}
Diag.DebugPrint("In SetupHttpRequestAndSendToHttpServer httpResponse is prepared to read response from server.");
// IMPORTANT: This sample is noticably different from other transports based on ControlChannelTrigger
// The HttpClient receive callback is delivered via a Task to the app since the HttpClient code is purely
// managed code based. This means push notification task will fire as soon as the data or error is dispatched
// to the application. Hence, in this sample we Enqueue the responseTask returned by httpClient.sendAsync
// into a queue that the push notify task will pick up and process inline.
AppContext.messageQueue.Enqueue(httpResponseTask);
}
