@Override
 public void removelocalUserRoleListener(ChatRoomLocalUserRoleListener listener) {
   localUserRoleListeners.remove(listener);
 }
 @Override
 public void removeMemberRoleListener(ChatRoomMemberRoleListener listener) {
   memberRoleListeners.remove(listener);
 }
 @Override
 public void removeMemberPresenceListener(ChatRoomMemberPresenceListener listener) {
   synchronized (memberListeners) {
     memberListeners.remove(listener);
   }
 }