java - 如何有效地从服务中调用 Spring 存储库方法？

Question

我有一个如下代码块:

@Repository
public class SummaryDao implements ISummaryDao {

    public List<Response> reportOfCategory(RequestObject obj){
       ...
    }

    public List<Response> reportOfGroup(RequestObject obj){
       ...
    }

    public List<Response> reportOfSubGroup(RequestObject obj){
       ...
    }

}

我的第二个存储库:

@Repository
public class ReportDao implements IReportDao {

    public List<Response> reportOfCategory(RequestObject obj){
       ...
    }

    public List<Response> reportOfGroup(RequestObject obj){
       ...
    }

    public List<Response> reportOfSubGroup(RequestObject obj){
       ...
    }

}

然后我从服务类中调用它们，如下所示:

@Service
public class ReportService {

@Autowired
ISummaryDao summaryDao;

@Autowired
IReportDao reportDao;

public List<Response> call(EnumType type, RequestObject obj){

   if(type == Category) {
     return obj.isSummary ? summaryDao.reportOfCategory : reportDao.reportOfCategory;
   }
   if(type == Group) {
     return obj.isSummary ? summaryDao.reportOfGroup : reportDao.reportOfGroup;
   }
   if(type == SubGroup) {
     return obj.isSummary ? summaryDao.reportOfSubGroup : reportDao.reportOfSubGroup;
   }
...
}

如何有效地调用它们？实际上我想逃避 if-else block 和 Enum 比较。

注意:枚举比较可以是 switch-case。

注意:在此代码中，我使用了 Spring-Boot EntityManager。我知道 JPARepository。这个问题与此无关。

Answer 1

我解决了这个问题，如下所示:

我创建了一个 IGeneralDao 来使用通用接口(interface)。

@Repository
public class SummaryDao implements IGeneralDao {

    public List<Response> reportOfCategory(RequestObject obj){
       ...
    }

    public List<Response> reportOfGroup(RequestObject obj){
       ...
    }

    public List<Response> reportOfSubGroup(RequestObject obj){
       ...
    }

}

第二个存储库:

@Repository
public class ReportDao implements IGeneralDao {

    public List<Response> reportOfCategory(RequestObject obj){
       ...
    }

    public List<Response> reportOfGroup(RequestObject obj){
       ...
    }

    public List<Response> reportOfSubGroup(RequestObject obj){
       ...
    }

}

调用它:

@Service
public class ReportService {

@Autowired
IGeneralDao reportDao, summaryDao;

public List<Response> call(EnumType type, RequestObject obj){
   IGeneralDao generalDao = isSummary ? summaryDao : reportDao;
   switch(type):
      case Category:
          return generalDao.reportOfCategory;
      case Group:
          return generalDao.reportOfGroup;
      case SubGroup:
          return generalDao.reportOfSubGroup;
...
}

逃避枚举比较:

public interface IGeneralDao {
    <T> T callReports(RequestDto requestDto);
    IGeneralDao setRequestType(EnumType type);
}

第一个存储库:

@Repository
public enum ReportDao implements IGeneralDao {
    Category {
        @Override
        public List<Response> callReports(RequestDto requestDto) {
            return ...;
        }
    },
    Group {
        @Override
        public List<Response> callReports(RequestDto requestDto) {
            return ...;
        }
    },
    SubGroup {
        @Override
        public List<Response> callReports(RequestDto requestDto) {
            return ...;
        }
    };

    @Override
    public IGenericDao setEnumType(EnumType type) {
        return valueOf(type.name());
    }
}

第二个存储库:

@Repository
public enum SummaryDao implements IGeneralDao {
    Category {
        @Override
        public Summary callReports(RequestDto requestDto) {
            return ...;
        }
    },
    Group {
        @Override
        public Summary callReports(RequestDto requestDto) {
            return ...;
        }
    },
    SubGroup {
        @Override
        public Summary callReports(RequestDto requestDto) {
            return ...;
        }
    };

    @Override
    public IGenericDao setEnumType(EnumType type) {
        return valueOf(type.name());
    }
}

然后从主服务调用它:

@Service
public class ReportService {

@Autowired
IGeneralDao reportDao, summaryDao;

public List<Response> call(EnumType type, RequestObject obj){
   IGeneralDao generalDao = isSummary ? summaryDao : reportDao;
   return generalDao.setEnumType(type).callReports(obj);
}