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31天重构指南之二十九:去除中间人对象

Posted on 2009-11-06 11:25  张荣华  阅读(439)  评论(0编辑  收藏  举报

今天要说的重构来自于Folwers的重构目录,你可以在这里查看。

有时在你的代码会存在一些幽灵类,Fowler称它们为“中间人”,中间人类除了调用别的对象之外不做任何事情,所以中间人类没有存在的必要,我们可以将它们从代码中删除。

   1: public class Consumer
   2: {
   3:     public AccountManager AccountManager { get; set; }
   4:  
   5:     public Consumer(AccountManager accountManager)
   6:     {
   7:         AccountManager = accountManager;
   8:     }
   9:  
  10:     public void Get(int id)
  11:     {
  12:         Account account = AccountManager.GetAccount(id);
  13:     }
  14: }
  15:  
  16: public class AccountManager
  17: {
  18:     public AccountDataProvider DataProvider { get; set; }
  19:  
  20:     public AccountManager(AccountDataProvider dataProvider)
  21:     {
  22:         DataProvider = dataProvider;
  23:     }
  24:  
  25:     public Account GetAccount(int id)
  26:     {
  27:         return DataProvider.GetAccount(id);
  28:     }
  29: }
  30:  
  31: public class AccountDataProvider
  32: {
  33:     public Account GetAccount(int id)
  34:     {
  35:         // get account
  36:     }
  37: }
 
要对上面的代码应用重构是简单明了的,我们只需要移除掉中间人对象就可以了。
   1: public class Consumer
   2: {
   3:     public AccountDataProvider AccountDataProvider { get; set; }
   4:  
   5:     public Consumer(AccountDataProvider dataProvider)
   6:     {
   7:         AccountDataProvider = dataProvider;
   8:     }
   9:  
  10:     public void Get(int id)
  11:     {
  12:         Account account = AccountDataProvider.GetAccount(id);
  13:     }
  14: }
  15:  
  16: public class AccountDataProvider
  17: {
  18:     public Account GetAccount(int id)
  19:     {
  20:         // get account
  21:     }
  22: }

 

原文链接:http://www.lostechies.com/blogs/sean_chambers/archive/2009/08/28/refactoring-day-29-remove-middle-man.aspx