+ {:stop, {:shutdown, err}, nil}
+ end
+ end
+
+ @impl true
+ def handle_cast({:add_client, client_pid}, state) do
+ case handle_call(:add_client, {client_pid, nil}, state) do
+ {:reply, conn_pid, state, :hibernate} ->
+ send(client_pid, {:conn_pid, conn_pid})
+ {:noreply, state, :hibernate}
+ end
+ end
+
+ @impl true
+ def handle_cast({:remove_client, client_pid}, state) do
+ case handle_call(:remove_client, {client_pid, nil}, state) do
+ {:reply, _, state, :hibernate} ->
+ {:noreply, state, :hibernate}