apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/PermissionController.java/PermissionController/getNamespaceRoles
class PermissionController:  @GetMapping("/apps/{appId}/namespaces/{namespaceName}/role_users")
  public NamespaceRolesAssignedUsers getNamespaceRoles(@PathVariable String appId, @PathVariable String namespaceName) {

    NamespaceRolesAssignedUsers assignedUsers = new NamespaceRolesAssignedUsers();
    assignedUsers.setNamespaceName(namespaceName);
    assignedUsers.setAppId(appId);

    Set<UserInfo> releaseNamespaceUsers =
        rolePermissionService.queryUsersWithRole(RoleUtils.buildReleaseNamespaceRoleName(appId, namespaceName));
    assignedUsers.setReleaseRoleUsers(releaseNamespaceUsers);

    Set<UserInfo> modifyNamespaceUsers =
        rolePermissionService.queryUsersWithRole(RoleUtils.buildModifyNamespaceRoleName(appId, namespaceName));
    assignedUsers.setModifyRoleUsers(modifyNamespaceUsers);

    return assignedUsers;
  }