apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/util/RoleUtils.java/RoleUtils/buildNamespaceRoleName
class RoleUtils:  public static String buildNamespaceRoleName(String appId, String namespaceName, String roleType, String env) {
    return STRING_JOINER.join(roleType, appId, namespaceName, env);
  }