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注册 2007-5-24
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php面向对象设计模式(命令模式)
AppMain.php
<?
//+---------------------------------------命令（Command）模式------------------------------------------------
//一般性常见代码
require_once('Receiver.php');
require_once('ICommand.php');
require_once('Command.php');
require_once('Invoker.php');
//组件装配关系如下:
//构造命令接收者对象
$receiver = new Receiver();
$receiver->name = 'Receiver服务组件';
$receiver->desc = '提供XX业务处理';
//构造具体命令对象,并指定命令的接收者
$command = new Command();
$command->receiver = $receiver;
//构造命令调用者对象,并指定一个命令
$invoker = new Invoker();
$invoker->command = $command;
//调用命令
$invoker->executeCommand();
/*
以上代码属于强偶合关系，具体依赖文件路径、文件名、类名，可替换性很差(如果组件有新的实现，只有覆盖以前的代码文件)
以下代码引入IOC进行解偶(优点:没有具体的依赖，依赖控制在配置文件中)
*/
/*
引入IOC进行组件装配,装配过程就是把组件所依赖的零部件(对象)给组件安装上去
站在单个组件层面上看,它所需要的零部件是由外部给它安装的
*/
require_once('Ioc/ClassFactory.php');
$factory = new ClassFactory();
$factory->getObject('invoker')->executeCommand();
?>
组件配置信息
DAOConfig.php
<?
//+---------------------------------------------------------------------------------------------------
//Desc:各组件对象的配置信息
//命令接收者组件
$objects[] = array(
'id' => 'receiver', //容器通过id标识获取对象配置信息
'enable' => true, //true 代表启用该组件，false 代表禁用该组件
'source' => 'Receiver.php', //组件的路径(具有可替换性)
'className' => 'Receiver', //组件的类名(具有可替换性)
'property' => array(
'name' => 'Receiver服务组件',
'desc' => '提供XX业务处理'
));
//具体命令组件
$objects[] = array(
'id' => 'command',
'enable' => true,
'source' => 'Command.php',
'className' => 'Command',
'import' => array('ICommand.php'), //命令接口
'ref' => array('receiver'=>'receiver') //依赖的组件对象
);
//调用者组件
$objects[] = array(
'id' => 'invoker',
'enable' => true,
'source' => 'Invoker.php',
'className' => 'Invoker',
'ref' => array('command'=>'command') //依赖的组件对象
);
?>
级联配置文件
MapConfig.php
<?
$source[]['source'] = 'Config/IocConfig/DAOConfig.php'; //业务逻辑对象配置
?>
Receiver.php
<?
//负责具体实施和执行一个请求
class Receiver
{
private $name = null; //组件名称
private $desc = null; //组件描述
/**
+----------------------------------------------------------
* 类的构造子
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __construct()
{
}
/**
+----------------------------------------------------------
* 类的析构方法(负责资源的清理工作)
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __destruct()
{
$this->name = $this->desc = null;
}
/**
+----------------------------------------------------------
* 属性访问器(写)
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __set($name,$value)
{
if(property_exists($this,$name))
{
$this->$name = $value ;
}
}
/**
+----------------------------------------------------------
* 执行业务操作
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function action()
{
print "组件名称: $this->name <br>";
print "组件描述: $this->desc <br>";
print "执行业务逻辑的相关操作<br><br>";
}
}
?>
ICommand.php
<?
//声明一个给所有具体命令类的抽象接口
interface ICommand
{
//发送命令请求
function execute();
}
?>
Command.php
<?
//定义一个接受者和行为之间的弱耦合,负责调用接收者的相应操作
class Command implements ICommand
{
//命令接收对象
private $receiver = null;
/**
+----------------------------------------------------------
* 类的构造子
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __construct()
{
}
/**
+----------------------------------------------------------
* 类的析构方法(负责资源的清理工作)
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __destruct()
{
$this->receiver = null;
}
/**
+----------------------------------------------------------
* 属性访问器(写)
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __set($name,$value)
{
if(property_exists($this,$name))
{
$this->$name = is_object($value) ? $value : null;
}
}
/**
+----------------------------------------------------------
* 发送命令请求
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function execute()
{
if(is_object($this->receiver))
{
$this->receiver->action();
}
else
{
print "执行过程中出现异常<br>";
}
}
}
?>
Invoker.php
<?
//负责调用命令对象执行请求
class Invoker
{
//命令对象
private $command = null;
/**
+----------------------------------------------------------
* 类的构造子
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __construct()
{
}
/**
+----------------------------------------------------------
* 类的析构方法(负责资源的清理工作)
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __destruct()
{
$this->command = null;
}
/**
+----------------------------------------------------------
* 属性访问器(写)
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __set($name,$value)
{
if(property_exists($this,$name))
{
$this->$name = is_object($value) ? $value : null;
}
}
/**
+----------------------------------------------------------
* 调用命令对象执行请求
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function executeCommand()
{
if(is_object($this->command))
{
$this->command->execute();
}
else
{
print "执行过程中出现异常<br>";
}
}
}
?>
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