private static void RemoveFromSortedWakeUpList(WakeUpCallRequest request)
{
if (Monitor.TryEnter(_wakeupCallList, 5000))
{
try
{
LinkedListNode <WakeUpCallRequest> node;
if (_requestDict.TryGetValue(request.RoomNo, out node))
{
_wakeupCallList.Remove(node);
_requestDict.Remove(request.RoomNo);
}
}
finally
{
Monitor.Exit(_wakeupCallList);
}
}
}
private static LinkedListNode <WakeUpCallRequest> InsertIntoSortedWakeUpList(WakeUpCallRequest request)
{
if (request.WakeUpTime == null)
{
return(null);
}
DateTime dateTimeToInsert = request.WakeUpTime.Value;
LinkedListNode <WakeUpCallRequest> nodeToInsert = null;
if (Monitor.TryEnter(_wakeupCallList, 5000))
{
try
{
LinkedListNode <WakeUpCallRequest> node = _wakeupCallList.First;
// when the list is empty
if (node == null)
{
nodeToInsert = _wakeupCallList.AddFirst(request);
}
else // when the list is not empty
{
while (node != null)
{
if (node.Value.WakeUpTime.Value >= dateTimeToInsert)
{
break;
}
node = node.Next;
}
nodeToInsert = node == null?_wakeupCallList.AddLast(request) : _wakeupCallList.AddBefore(node, request);
}
_requestDict[request.RoomNo] = nodeToInsert;
}
finally
{
Monitor.Exit(_wakeupCallList);
}
}
return(nodeToInsert);
}
private static void Alarm()
{
if (Monitor.TryEnter(_wakeupCallList))
{
try
{
if (_wakeupCallList.First == null)
{
return;
}
WakeUpCallRequest firstCallRequest = _wakeupCallList.First.Value;
DateTime earliestCallTime = firstCallRequest.WakeUpTime.Value;
if (DateTime.Today + MockAPI.getCurrenTime() >= earliestCallTime)
{
MockAPI.sendAlarmCall(firstCallRequest.RoomNo);
RemoveFromSortedWakeUpList(firstCallRequest);
}
}
finally
{
Monitor.Exit(_wakeupCallList);
}
}
}
