private CaptureInfo ProcessResponse(string response)
{
// Parse the response XML
XDocument xml;
try
{
xml = XDocument.Parse(response);
}
catch (System.Xml.XmlException ex)
{
throw new SimTemplateException("Failed to parse response XML", ex);
}
CaptureInfo capture;
// Expect one capture element (or none)
XElement captureEl = xml.Elements("capture").SingleOrDefault();
if (captureEl != null)
{
capture = SimTemplateServerHelper.ToCaptureInfo(captureEl);
}
else
{
throw new SimTemplateException("XML response contained no capture results");
}
return(capture);
}
protected override void StartSaveTask(long dbId, byte[] template, Guid guid, CancellationToken token)
{
// Make HTTP request
HttpContent content = new ByteArrayContent(template);
Task <HttpResponseMessage> saveResponse = m_Client.PostAsync(SimTemplateServerHelper.SaveTemplateUri(dbId), content);
// When task is complete, raise GetCaptureComplete event
// Pass the task the cancellation token so that this action may be skipped
saveResponse.ContinueWith((Task <HttpResponseMessage> sTT) =>
{
// Check for cancellation (race)
if (!token.IsCancellationRequested)
{
// HTTP requests are not cancellable
IntegrityCheck.IsFalse(sTT.IsCanceled);
if (sTT.IsCompleted)
{
HttpResponseMessage response = sTT.Result;
// Do some dealing with the response to check it was successful
OnSaveTemplateComplete(
new SaveTemplateEventArgs(guid, DataRequestResult.Success));
}
else if (sTT.IsFaulted)
{
// An exception was thrown during the request.
Log.Error("Save Template task failed: " + sTT.Exception.Message, sTT.Exception);
OnSaveTemplateComplete(
new SaveTemplateEventArgs(guid, DataRequestResult.TaskFailed));
}
}
}, token);
}
protected override void StartCaptureTask(ScannerType scannerType, Guid guid, CancellationToken token)
{
Log.DebugFormat("Starting task with Guid={0}", guid);
// Make HTTP request
Task <string> responseText = m_Client.GetStringAsync(
SimTemplateServerHelper.GetCaptureRequestUri(scannerType));
// When task is complete, raise GetCaptureComplete event
// Pass the task the cancellation token so that this action may be skipped
responseText.ContinueWith((Task <string> gCT) =>
{
// Check for cancellation (race)
if (!token.IsCancellationRequested)
{
// HTTP requests are not cancellable
IntegrityCheck.IsFalse(gCT.IsCanceled);
if (gCT.IsCompleted)
{
CaptureInfo capture;
try
{
capture = ProcessResponse(gCT.Result);
OnGetCaptureComplete(
new GetCaptureCompleteEventArgs(capture, guid, DataRequestResult.Success));
}
catch (SimTemplateException ex)
{
Log.Error("Failed to process xml response:", ex);
OnGetCaptureComplete(
new GetCaptureCompleteEventArgs(null, guid, DataRequestResult.Failed));
}
}
else if (gCT.IsFaulted)
{
// An exception was thrown during the request.
Log.Error("GetCapture task failed: " + gCT.Exception.Message, gCT.Exception);
OnGetCaptureComplete(
new GetCaptureCompleteEventArgs(null, guid, DataRequestResult.TaskFailed));
}
}
}, token);
}
