public synchronized void removeItemListener(ItemListener<E> listener) {
   check(listener);
   itemListenerManager().removeListener(name, listener);
   Packet request = proxyHelper.createRequestPacket(ClusterOperation.REMOVE_LISTENER, null, null);
   Call c = proxyHelper.createCall(request);
   proxyHelper.doCall(c);
 }
 public Call createNewAddListenerCall(final ProxyHelper proxyHelper) {
   Packet request = proxyHelper.createRequestPacket(ClusterOperation.ADD_LISTENER, null, null);
   return proxyHelper.createCall(request);
 }