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Java代码设计双向关联

[英]Java code design bidirectional association

原文 2016-05-26 22:41:09 3 1 java/ spring/ associations/ bidirectional

This is a question about application code design. 这是有关应用程序代码设计的问题。 Here is my situation: 这是我的情况：
I have a db table named Report which represents the amount of time of work of a user during a given month. 我有一个名为Report的数据库表，它表示用户在给定月份内的工作时间。 I have a DAO to deal with database and a @Service which encapsulates dao's methods and do more stuff with reports. 我有一个DAO来处理数据库，还有一个@Service，它封装了dao的方法并在报告中做更多的事情。

In addition, I have a table Target , to assign goals to the users about their activities (goals can be monthly or yearly). 另外，我还有一个表Target ，可以为用户分配有关其活动的目标（目标可以是每月或每年）。 I have again a DAO and a @Service to use these entities. 我又有一个DAO和一个@Service来使用这些实体。

My question is about design, because i have a bidirectional association between the two services, especially for the following processes: 我的问题是关于设计的，因为我在两个服务之间存在双向关联，尤其是对于以下过程：

The Report service needs to update the target service when a report is added, modified or deleted.. 添加，修改或删除报告时，报告服务需要更新目标服务。
The target service needs the report service when we need to calculate the progression of a Target 当我们需要计算目标的进度时，目标服务需要报表服务

I'm refactoring my application and seeing the two beans beans who need each other makes me feel this is not so good... 我正在重构我的应用程序，看到彼此需要的两个bean令我感到这不太好...
Is there a way to design properly this situation (I mean the association between my two services) or should I stay with the bidirectional association? 有没有一种方法可以正确设计这种情况（我的意思是我的两个服务之间的关联），还是应该保留双向关联？

1 个解决方案

Finally, I solved my problem by making some changes in my ReportDAO and by calling it in my TargetService . 最后，我通过在我ReportDAO一些变化，并通过调用它在我TargetService解决我的问题。 By doing this, I could remove bidirectional association between my two services and have only an unidirectional association. 这样，我可以删除两个服务之间的双向关联，而只有一个单向关联。