如何有效地实施弹簧战略模式？ [英] How to efficiently implement a strategy pattern with spring?

问题描述

我有一个使用Spring框架在Java 1.5中开发的Web应用程序。应用程序包含仪表板，这些页面是简单的页面，其中一组信息被重新分组，用户可以在其中修改某些状态。管理人员希望我在数据库中为三个仪表板添加日志记录系统。每个仪表板都有不同的信息，但日志应该按日期和用户登录进行跟踪。

I have a web application developped in Java 1.5 with Spring framework. Application contains "dashboards" which are simple pages where a bunch of information are regrouped and where user can modify some status. Managers want me to add a logging system in database for three of theses dashboards. Each dashboard has different information but the log should be traced by date and user's login.

我想要做的是实现类似这样的策略模式：

What I'd like to do is to implement the Strategy pattern kind of like this :

interface DashboardLog {
   void createLog(String login, Date now);
}

// Implementation for one dashboard
class PrintDashboardLog implements DashboardLog {
  Integer docId;
  String status;

  void createLog(String login, Date now){
    // Some code
  }
}

class DashboardsManager {
  DashboardLog logger;
  String login;
  Date now;

  void createLog(){
     logger.log(login,now);
  }
}

class UpdateDocAction{
   DashboardsManager dbManager;

   void updateSomeField(){
      // Some action
      // Now it's time to log
      dbManagers.setLogger = new PrintDashboardLog(docId, status);
      dbManagers.createLog();
   } 
}

Appcontext.xml：

Appcontext.xml :

<bean id="dashboardManagers" class="...DashboardManagers" />

在这个解决方案中，我没有使用依赖注入。以这种方式做到这一点是正确的（良好做法，表现......）有没有更好的方法可以使用DI？

In this solution I'm therefore not using dependency injection. Is it "correct" (good practice, performance, ...) to do it this way ? Is there a better way where I could use DI ?

注意：我没有写基本的东西，比如构造函数和getter / setter。

推荐答案

尽管采用策略模式完全正确，但考虑到你使用Spring的事实 - 使用Spring提供的依赖注入机制将更好框架 - 也可以将您的框架提供的内容作为其核心优势之一。

While it is perfectly "correct" to employ the strategy pattern as you have, but considering the fact that you're using Spring - it would be better to employ the Dependency Injection mechanism provided by the Spring framework - might as well put to use what your framework has to offer as one of its core strengths.

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