public static LockingSingleton GetInstance()
{
if (_instance == null)
{
_instance = new LockingSingleton();
}
return(_instance);
}
private void PulseSessionStartHandler(object sender, CriterionEventArgs e)
{
var locker = LockingSingleton.GetInstance();
if (Monitor.TryEnter(locker.lockObj))
{
try
{
if (!locker.isLocked)
{
locker.isLocked = true;
Debug.WriteLine("PulseSessionStartHandler(): START");
string ip = IpHelper.GetIPAddress(new HttpRequestWrapper(HttpContext.Current.Request));
Debug.WriteLine("PulseSessionStartHandler(): IP:" + ip);
CoordinatesModel coordinates = GeoLocationHelper.GetCoordinatesFromIp(IPAddress.Parse(ip));
if (coordinates == null)
{
e.HttpContext.Session["pulse_segments"] = new string[0];
locker.isLocked = false;
return;
}
QueryPulse(coordinates, e.HttpContext.Session, locker);
Debug.WriteLine("PulseSessionStartHandler(): END");
}
else
{
Debug.WriteLine("PulseSessionStartHandler(): Another thread already started");
}
}
finally
{
// Ensure that the lock is released.
Monitor.Exit(locker.lockObj);
Debug.WriteLine("PulseSessionStartHandler(): Lock released");
}
}
}
public static void QueryPulse(CoordinatesModel coordinates, HttpSessionStateBase sessionBase, LockingSingleton locker)
{
Debug.WriteLine("QueryPulse(): START");
HttpClient httpClient = HttpHelper.GetClient();
HttpSessionStateBase session = sessionBase;
if (httpClient == null)
{
locker.isLocked = false;
return;
}
httpClient.SendAsync(HttpHelper.GetHttpRequestMessage(coordinates)).ContinueWith((task) =>
{
var response = task.Result;
if (response.StatusCode == HttpStatusCode.OK)
{
Debug.WriteLine("QueryPulse(): Status: " + response.StatusCode);
var jsonTask = response.Content.ReadAsStringAsync();
jsonTask.Wait();
PulseSegmentListModel ps = JsonConvert.DeserializeObject <PulseSegmentListModel>(jsonTask.Result);
session["pulse_segments"] = ps.data;
Debug.WriteLine("QueryPulse(): Data: " + string.Join(", ", ps.data));
}
else
{
Debug.WriteLine("QueryPulse(): Error: {0}", response);
}
locker.isLocked = false;
});
Debug.WriteLine("QueryPulse(): END");
return;
}