设计模式之策略模式

<?php
/**
 * 某个对象不必自身包含逻辑，而是能够应用其他对象的算法
 *
 */


class LogStrategy
{
    public $message;
    public $level;
    public $type;


    protected $_strategy;


    public function __construct($message, $level, $type)
    {
        $this->message = $message;
        $this->level = $level;
        $this->type = $type;
    }


    public function setStrategy($strategyObj)
    {
        $this->_strategy = $strategyObj;
    }


    public function log()
    {
        $this->_strategy->log($this);
    }
}


interface Log
{
    public function log($logObject);
}


class DBStrategy implements Log
{


    public function log($logObject)
    {
        $this->_logToDB($logObject);
    }


    private function _logToDB($logObject)
    {
        var_dump($logObject);
        echo "log to db\n";
    }
}


class QUEStrategy implements Log
{
    public function log($logObject)
    {
        $this->_logToQUE($logObject);
    }




    private function _logToQUE($logObject)
    {


        var_dump($logObject);
        echo "log to queue";
    }
}


echo "<pre>";
$log = new LogStrategy("can't find the file", "error", "user_error");
$log->setStrategy(new DBStrategy());
$log->log();


$log->setStrategy(new QUEStrategy());
$log->log();