internal IRequestHandler GetRequestHandler(RoutableReference rf, IObjectPrx proxy)
        {
            if (rf.GetCollocationOptimized())
            {
                ObjectAdapter?adapter = FindObjectAdapter(proxy);
                if (adapter != null)
                {
                    return(proxy.IceSetRequestHandler(new CollocatedRequestHandler(rf, adapter)));
                }
            }

            bool connect = false;
            ConnectRequestHandler handler;

            if (rf.GetCacheConnection())
            {
                lock (_handlers)
                {
                    if (!_handlers.TryGetValue(rf, out handler))
                    {
                        handler = new ConnectRequestHandler(rf, proxy);
                        _handlers.Add(rf, handler);
                        connect = true;
                    }
                }
            }
            else
            {
                handler = new ConnectRequestHandler(rf, proxy);
                connect = true;
            }

            if (connect)
            {
                rf.GetConnection(handler);
            }
            return(proxy.IceSetRequestHandler(handler.Connect(proxy)));
        }