// Adds obj to the tail of the queue. And possibly reorders the queue
//
public virtual void Enqueue(T obj)
{
WillEnqueue?.Invoke(this, new WillEnqueueEventArgs <T>(_array[_tail], obj));
if (_size == _array.Length)
{
int newcapacity = (int)((long)_array.Length * (long)_growFactor / 100);
if (newcapacity < _array.Length + _MinimumGrow)
{
newcapacity = _array.Length + _MinimumGrow;
}
SetCapacity(newcapacity);
}
DateTime?lastDateTime = null;
DateTime?currentDateTime = null;
if (_size > 0)
{
lastDateTime = _dateTimeGetter.Invoke(_array[_tail - 1]);
}
currentDateTime = _dateTimeGetter.Invoke(obj);
// ToDo: Make this behaviour configurable
if (_array.Any(q => q != null && _dateTimeGetter.Invoke(q) == currentDateTime.GetValueOrDefault()))
{
return; // Silently ignore double datetimestamps.
}
_array[_tail] = obj;
if (currentDateTime < lastDateTime)
{
// Add to the list and reshuffle.
List <T> list = new List <T>();
foreach (var item in _array)
{
list.Add(item);
}
_array = list.OrderBy(q => _dateTimeGetter.Invoke(q)).ToArray();
}
_tail = (_tail + 1) % _array.Length;
_size++;
_version++;
DidEnqueue?.Invoke(this, new DidEnqueueEventArgs <T>(_array[_tail], _array[_tail - 1]));
}
/// <summary>
/// Raises the WillEnqueue event.
/// </summary>
/// <param name="currentHeadOfQueue">Current head of queue.</param>
/// <param name="itemToEnqueue">Item to enqueue.</param>
protected virtual void OnWillEnqueue(T currentHeadOfQueue, T itemToEnqueue)
{
WillEnqueue?.Invoke(this, new WillEnqueueEventArgs <T>(currentHeadOfQueue, itemToEnqueue));
}