public virtual void AttachEvent(string eventName, IWeakEventTarget target)
{
bool eventFound = false;
if (target != null)
{
for (int i = 0; i < _weakEvents.Length; i++)
{
if (string.Compare(eventName, _weakEvents[i], true) == 0)
{
eventFound = true;
if (HasTarget(_listeners[i], target) == null)
{
_listeners[i].Add(new WeakReference(target));
if (_logger != null)
{
_logger(5, string.Format("WEAK_EVT_SRC {0}. Attmept to attach listener for event {1}... OK [target added]; Target ID = {2}", _sourceID, eventName, target.TargetFriendlyID));
}
}
else
{
if (_logger != null)
{
_logger(4, string.Format("WEAK_EVT_SRC {0}: Attmept to attach listener for event {1}... IGNORED [target already listening]; Target ID = {2}", _sourceID, eventName, target.TargetFriendlyID));
}
}
break;
}
}
if (!eventFound && _logger != null)
{
_logger(2, string.Format("WEAK_EVT_SRC {0}: Attmept to attach listener for event {1}... FAILED [no such event]; Target ID = {2}", _sourceID, eventName, target.TargetFriendlyID));
}
}
}
private WeakReference HasTarget(IList<WeakReference> listeners, IWeakEventTarget target)
{
WeakReference r = null;
for (int i = listeners.Count - 1; i >= 0; i--)
{
if (ReferenceEquals(listeners[i].Target, target))
{
r = listeners[i];
break;
}
else if (!listeners[i].IsAlive || listeners[i].Target == null)
{
listeners.RemoveAt(i);
}
}
return r;
}
public virtual void DetachEvent(string eventName, IWeakEventTarget target)
{
if (target != null)
{
int targetRemoved = 0;
for (int i = 0; i < _weakEvents.Length; i++)
{
if (string.Compare(eventName, _weakEvents[i], true) == 0)
{
WeakReference targetRef = null;
do
{
targetRef = HasTarget(_listeners[i], target);
if (targetRef != null)
{
_listeners[i].Remove(targetRef);
targetRemoved++;
}
} while (_listeners[i].Count > 0 && targetRef != null);
break;
}
}
if (targetRemoved > 0)
{
if (_logger != null)
{
_logger(4, string.Format("WEAK_EVT_SRC {0}: Attmept to detach listener for event {1}... OK [target removed {2} time(s)]; Target ID = {3}", _sourceID, eventName, targetRemoved, target.TargetFriendlyID));
}
}
else
{
if (_logger != null)
{
_logger(2, string.Format("WEAK_EVT_SRC {0}: Attmept to detach listener for event {1}... FAILED [target did not exist or no such event]; Target ID = {2}", _sourceID, eventName, target.TargetFriendlyID));
}
}
}
}
