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php设计模式 Strategy(策略模式)

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">
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 2014-12-07 14:39:06 转载来源: 网络整理/侵权必删

本文为大家提供的是php设计模式中的 Strategy(策略模式)示例代码，感兴趣的同学参考下。 定义一系列算法,把它们一个个封装起来,并且使它们可相互替换,使用得算法的变化可独立于使用它的客户 <?php /** * 策略模式(Strategy.php) * * 定义一系列算法,把它们一个个封装起来,并且使它们可相互替换,使用得算法的变化可独立于使用它的客户 * */ // ---以下是一系列算法的封闭---- interface CacheTable { public function get($key); public function set($key,$value); public function del($key); } // 不使用缓存 class NoCache implements CacheTable { public function __construct(){ echo "Use NoCache<br/>"; } public function get(

本文为大家提供的是php设计模式中的 Strategy(策略模式)示例代码，感兴趣的同学参考下。

定义一系列算法,把它们一个个封装起来,并且使它们可相互替换,使用得算法的变化可独立于使用它的客户


<?php
/**
* 策略模式(Strategy.php)
*
* 定义一系列算法,把它们一个个封装起来,并且使它们可相互替换,使用得算法的变化可独立于使用它的客户
*
*/

// ---以下是一系列算法的封闭----
interface CacheTable
{
public function get($key);
public function set($key,$value);
public function del($key);
}

// 不使用缓存
class NoCache implements CacheTable
{
public function __construct(){
echo "Use NoCache<br/>";
}

public function get($key)
{
return false;
}

public function set($key,$value)
{
return true;
}

public function del($key)
{
return false;
}
}

// 文件缓存
class FileCache implements CacheTable
{
public function __construct()
{
echo "Use FileCache<br/>";
// 文件缓存构造函数
}

public function get($key)
{
// 文件缓存的get方法实现
}

public function set($key,$value)
{
// 文件缓存的set方法实现
}

public function del($key)
{
// 文件缓存的del方法实现
}
}

// TTServer
class TTCache implements CacheTable
{
public function __construct()
{
echo "Use TTCache<br/>";
// TTServer缓存构造函数
}

public function get($key)
{
// TTServer缓存的get方法实现
}

public function set($key,$value)
{
// TTServer缓存的set方法实现
}

public function del($key)
{
// TTServer缓存的del方法实现
}
}

// -- 以下是使用不用缓存的策略 ------
class Model
{
private $_cache;
public function __construct()
{
$this->_cache = new NoCache();
}

public function setCache($cache)
{
$this->_cache = $cache;
}
}

class UserModel extends Model
{
}

class PorductModel extends Model
{
public function __construct()
{
$this->_cache = new TTCache();
}
}

// -- 实例一下 ---
$mdlUser = new UserModel();
$mdlProduct = new PorductModel();
$mdlProduct->setCache(new FileCache()); // 改变缓存策略
?>

标签: php 设计模式 Strategy 策略 模式


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