apollo-client/src/main/java/com/ctrip/framework/apollo/ConfigService.java/ConfigService/setConfig
class ConfigService:  static void setConfig(String namespace, final Config config) {
    s_instance.getRegistry().register(namespace, new ConfigFactory() {
      @Override
      public Config create(String namespace) {
        return config;
      }

      @Override
      public ConfigFile createConfigFile(String namespace, ConfigFileFormat configFileFormat) {
        return null;
      }

    });
  }