}
}
class ProxySubject extends Subject
{
// 代理主题角色
private $_real_subject = NULL;
public function __construct()
{
}
public function action()
{
$this->_beforeAction();
if (is_null($this->_real_subject)) {
$this->_real_subject = new RealSubject();
}
$this->_real_subject->action();
$this->_afterAction();
}
private function _beforeAction()
{
echo '在action前,我想干点啥....';
}
private function _afterAction()
{
echo '在action后,我还想干点啥....';
}
}
// client
$subject = new ProxySubject();
$subject->action();