147 

   147 

   148         private static Set<SocketOption<?>> defaultOptions() {

   148         private static Set<SocketOption<?>> defaultOptions() {

   149             HashSet<SocketOption<?>> set = new HashSet<>();

   149             HashSet<SocketOption<?>> set = new HashSet<>();

   150             set.add(StandardSocketOptions.SO_SNDBUF);

   150             set.add(StandardSocketOptions.SO_SNDBUF);

   151             set.add(StandardSocketOptions.SO_RCVBUF);

   151             set.add(StandardSocketOptions.SO_RCVBUF);

   153             set.add(StandardSocketOptions.SO_KEEPALIVE);

   152             set.add(StandardSocketOptions.SO_KEEPALIVE);

   154             set.add(StandardSocketOptions.SO_LINGER);

   153             set.add(StandardSocketOptions.SO_LINGER);

   155             return Collections.unmodifiableSet(set);

   154             return Collections.unmodifiableSet(set);

   156         }

   155         }

   157     }

   156     }