(6) Object-oriented design principle two

one. Introduction:
Command mode: The command mode is divided into "requester of command" and "implementer of command". This completes the decoupling of command requests and implementation.

2. Example:

<?php
/*
 * 模拟服务员与厨师
 */
class MealCommand implements Command{
    private $cook;
    public function __construct(cook $cook){
        $this->cook = $cook;
    }
    public function execute(){
        $this->cook->meal();
    }
}

class DrinkCommand implements Command{
    private $cook;
    public function __construct(cook $cook){
        $this->cook = $cook;
    }

    public function execute(){
        $this->cook->drink();
    }
}

/*
 * 模拟类
 */
class cookControl{
    private $mealCommand;
    private $drinkCommand;

    public function addCommand(Command $mealCommand,Command $drinkCommand){
        $this->mealCommand = $mealCommand;
        $this->drinkCommand = $drinkCommand;
    }

    public function callMeal(){
        $this->mealCommand->execute();
    }

    public function callDrink(){
        $this->drinkCommand->execute();
    }
}

$control = new cookControl();
$cook = new cook;
$mealCommand = new MealCommand($cook);
$drinkCommand = new DrinkCommand($cook);
$control->addCommand($mealCommand,$drinkCommand);
$control->callMeal();
$control->callDrink();

Three. Principles of use:
1. Based on the business process, refine the business process. Abstraction step by step until 'appropriate'.
2. Pay attention to the classification of responsibilities.

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The above has introduced the second principle of (6) object-oriented design, including aspects of content. I hope it will be helpful to friends who are interested in PHP tutorials.