apollo-biz/src/main/java/com/ctrip/framework/apollo/biz/service/ReleaseService.java/ReleaseService/findAllReleases
class ReleaseService:  public List<Release> findAllReleases(String appId, String clusterName, String namespaceName, Pageable page) {
    List<Release> releases = releaseRepository.findByAppIdAndClusterNameAndNamespaceNameOrderByIdDesc(appId,
                                                                                                      clusterName,
                                                                                                      namespaceName,
                                                                                                      page);
    if (releases == null) {
      return Collections.emptyList();
    }
    return releases;
  }