PHP Design Pattern Command Pattern_PHP Tutorial

Command mode: Encapsulate a request as an object so that you can parameterize the client with different requests; queue or log requests, and support undoable operations. Command class: 1. Command role: declares an abstract interface for all specific command classes. This is an abstract role. 2. Specific command role: define a weak coupling between the acceptor and the behavior; implement the execute method, which is responsible for calling the corresponding operation of the acceptance. The execute() method is usually called the execution method 3. Customer role: Create a specific command object and determine its recipient. 4. Requester role: Responsible for calling the command object to execute the request. The related method is called the action method. 5. Acceptor role: Responsible for the specific implementation and execution of a request. Function: 1. Abstract the action to be performed to parameterize the object. 2. Specify, sequence and execute requests at different times. 3.Support cancellation operation 4.Support modification log ​

<?<span php
</span><span //</span><span 命令接口</span>
<span interface</span><span  Command{
     </span><span public</span> <span function</span><span  execute();
}
</span><span //</span><span 具体命令</span>
<span class</span> ConcreteCommand <span implements</span><span  Command{
     </span><span private</span> <span $_receiver</span><span ;
     </span><span public</span> <span function</span> __construct(<span $receiver</span><span ){
          </span><span $this</span>->_receiver = <span $receiver</span><span ;
     }
     </span><span public</span> <span function</span><span  execute(){
          </span><span $this</span>->_receiver-><span action();
     }
}
 
</span><span //</span><span 接受者</span>
<span class</span><span  Receiver{
     </span><span private</span> <span $_name</span><span ;
     </span><span public</span> <span function</span> __construct(<span $name</span><span ){
          </span><span $this</span>->_name = <span $name</span><span ;
     }
     </span><span //</span><span 行动方法</span>
     <span public</span> <span function</span><span  action(){
          </span><span echo</span> <span $this</span>->_name.'do action .<br/>'<span ;
     }
}
</span><span //</span><span 请求者</span>
<span class</span><span  Invoker{
     </span><span private</span> <span $_command</span><span ;
     </span><span public</span> <span function</span> __construct(<span $command</span><span ){
          </span><span $this</span>->_command = <span $command</span><span ;
     }
     </span><span public</span> <span function</span><span  action(){
          </span><span $this</span>->_command-><span execute();
     }
}
 
</span><span //</span><span 客户端</span>
<span class</span><span   Client{
     </span><span public</span> <span static</span> <span function</span><span  main(){
          </span><span $receiver</span> = <span new</span> Receiver('jaky'<span );
          </span><span $command</span> = <span new</span> ConcreteeCommand(<span $receiver</span><span );
          </span><span $invoker</span> = <span new</span> Invoker(<span $command</span><span );
          </span><span $invoker</span>-><span action();
     }
}
Client</span>::<span main();
</span>?>

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