/// <summary>
/// Long polling wait loop, incoming requests are slept until timeout or a new message
/// </summary>
/// <param name="topic">Message topic</param>
/// <param name="endDateTime">Ending time of sleep operation</param>
/// <param name="lastReceivedMsgDT">UTC DateTime value of the last send message</param>
/// <returns></returns>
private List <PushMessage> Internal_HandleRequest(string topic, DateTime endDateTime, DateTime?lastReceivedMsgDT)
{
lock (_waitHandleTransitionLock)
{
// Waitfor proper _waitHandle transition to avoid stackoverflow
}
var messages = _persistanceService.Get(topic, lastReceivedMsgDT);
if ((messages != null) && (messages.Count > 0))
{
return(messages);
}
else
{
int remaingWaitMiliseconds = (int)endDateTime.Subtract(DateTime.UtcNow).TotalMilliseconds;
if (remaingWaitMiliseconds == 0)
{
return(_persistanceService.Get(topic, lastReceivedMsgDT));
}
else if (remaingWaitMiliseconds < 0)
{
return(new List <DTOs.PushMessage>());
}
// Wait for any signal
_waitHandle.WaitOne(remaingWaitMiliseconds);
return(Internal_HandleRequest(topic, endDateTime, lastReceivedMsgDT));
}
}
