/// <summary>
/// Enqueues an association between the entity and the provided event and invokes the
/// operation of the event. Removes the same association from the queue if an
/// exception is thrown by the event.
/// </summary>
/// <param name="ev"></param>
private void EventPerform(Event ev)
{
EntityEventInvokeQueueItem item = new EntityEventInvokeQueueItem(this, ev);
evQueue.Enqueue(item);
try
{
ev.PerformOperation();
}
catch (Exception e)
{
Queue <EntityEventInvokeQueueItem> tmpQueue = new Queue <EntityEventInvokeQueueItem>();
while (evQueue.Count > 0)
{
if (evQueue.Peek() != item)
{
tmpQueue.Enqueue(evQueue.Dequeue());
}
}
while (tmpQueue.Count > 0)
{
evQueue.Enqueue(tmpQueue.Dequeue());
}
throw e;
}
}
/// <summary>
/// Causes an event to perform its operation and invokes all specific handlers.
/// </summary>
/// <param name="ev"></param>
protected void InvokeEvent(Event ev)
{
if (evQueue.Count == 0)
{
EventPerform(ev);
while (evQueue.Count > 0)
{
EntityEventInvokeQueueItem item = evQueue.Peek();
item.Entity.NotifyEvent(item.Event);
evQueue.Dequeue();
}
}
else
{
EventPerform(ev);
}
}