public static void tryShutdown(final HazelcastInstance hazelcastInstance) {
   if (hazelcastInstance == null) return;
   final FactoryImpl factory = (FactoryImpl) hazelcastInstance;
   closeSockets(factory);
   try {
     factory.node.doShutdown(true);
   } catch (Throwable ignored) {
   }
 }
 public static void tryCloseConnections(final HazelcastInstance hazelcastInstance) {
   if (hazelcastInstance == null) return;
   final FactoryImpl factory = (FactoryImpl) hazelcastInstance;
   closeSockets(factory);
 }