php设计模式 Command(命令模式)

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1. <?php
   
2. /**
   
3. * 命令模式
   
4. *
   
5. * 将一个请求封装为一个对象从而使你可用不同的请求对客户进行参数化,对请求排除或记录请求日志,以及支持可取消的操作
   
6. */
   
7. interface Command
   
8. {
   
9. publicfunction execute();
   
10. }
    
11. 
    
12. class Invoker
    
13. {
    
14. private$_command=array();
    
15. publicfunction setCommand($command) {
    
16. $this->_command[] =$command;
    
17.     }
    
18. 
    
19. publicfunction executeCommand()
    
20.     {
    
21. foreach($this->_command as$command)
    
22.         {
    
23. $command->execute();
    
24.         }
    
25.     }
    
26. 
    
27. publicfunction removeCommand($command)
    
28.     {
    
29. $key=array_search($command,$this->_command);
    
30. if($key!==false)
    
31.         {
    
32. unset($this->_command[$key]);
    
33.         }
    
34.     }
    
35. }
    
36. 
    
37. class Receiver
    
38. {
    
39. private$_name=null;
    
40. 
    
41. publicfunction __construct($name) {
    
42. $this->_name =$name;
    
43.     }
    
44. 
    
45. publicfunction action()
    
46.     {
    
47. echo$this->_name." action
    
48. ";
    
49.     }
    
50. 
    
51. publicfunction action1()
    
52.     {
    
53. echo$this->_name." action1
    
54. ";
    
55.     }
    
56. }
    
57. 
    
58. class ConcreteCommand implements Command
    
59. {
    
60. private$_receiver;
    
61. publicfunction __construct($receiver)
    
62.     {
    
63. $this->_receiver =$receiver;
    
64.     }
    
65. 
    
66. publicfunction execute()
    
67.     {
    
68. $this->_receiver->action();
    
69.     }
    
70. }
    
71. 
    
72. class ConcreteCommand1 implements Command
    
73. {
    
74. private$_receiver;
    
75. publicfunction __construct($receiver)
    
76.     {
    
77. $this->_receiver =$receiver;
    
78.     }
    
79. 
    
80. publicfunction execute()
    
81.     {
    
82. $this->_receiver->action1();
    
83.     }
    
84. }
    
85. 
    
86. class ConcreteCommand2 implements Command
    
87. {
    
88. private$_receiver;
    
89. publicfunction __construct($receiver)
    
90.     {
    
91. $this->_receiver =$receiver;
    
92.     }
    
93. 
    
94. publicfunction execute()
    
95.     {
    
96. $this->_receiver->action();
    
97. $this->_receiver->action1();
    
98.     }
    
99. }
    
100. 
     
101. 
     
102. $objRecevier=new Receiver("No.1");
     
103. $objRecevier1=new Receiver("No.2");
     
104. $objRecevier2=new Receiver("No.3");
     
105. 
     
106. $objCommand=new ConcreteCommand($objRecevier);
     
107. $objCommand1=new ConcreteCommand1($objRecevier);
     
108. $objCommand2=new ConcreteCommand($objRecevier1);
     
109. $objCommand3=new ConcreteCommand1($objRecevier1);
     
110. $objCommand4=new ConcreteCommand2($objRecevier2); // 使用 Recevier的两个方法
     
111. 
     
112. $objInvoker=new Invoker();
     
113. $objInvoker->setCommand($objCommand);
     
114. $objInvoker->setCommand($objCommand1);
     
115. $objInvoker->executeCommand();
     
116. $objInvoker->removeCommand($objCommand1);
     
117. $objInvoker->executeCommand();
     
118. 
     
119. $objInvoker->setCommand($objCommand2);
     
120. $objInvoker->setCommand($objCommand3);
     
121. $objInvoker->setCommand($objCommand4);
     
122. $objInvoker->executeCommand();

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本文摘自：http://www.cnblogs.com/bluefrog/archive/2011/06/16/2082252.html
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