Method Server

src/test/msgr/test_async_networkstack.cc:828–832

   public:
    Server(StressFactory *f, EventCenter *c, ConnectedSocket s):
        factory(f), center(c), socket(std::move(s)), read_ctxt(this), write_ctxt(this) {
      center->create_file_event(socket.fd(), EVENT_READABLE, &read_ctxt);
      center->dispatch_event_external(&read_ctxt);
    }
    void close() {
      ASSERT_FALSE(write_enabled);
      socket.shutdown();