code: public static ServerTransport getServerTransport(ServerTransportConfig serverConfig) {
          ServerTransport serverTransport = ExtensionLoaderFactory.getExtensionLoader(ServerTransport.class)
              .getExtension(serverConfig.getContainer(),
                  new Class[] { ServerTransportConfig.class },
                  new Object[] { serverConfig });
          if (serverTransport != null) {
              String key = Integer.toString(serverConfig.getPort());
              SERVER_TRANSPORT_MAP.put(key, serverTransport);
          }
          return serverTransport;
      }
docs: Get ServerTransport
  
  @param serverConfig ServerTransportConfig
  @return ServerTransport