php设计模式 Strategy(策略模式)
复制代码 代码如下:
/**
* 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
";
}
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
";
// 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
";
// 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
?>

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