基于yaf实现DI容器

DI设计与实现

方法	要求
createObject($config)	$config中必须有class节点，表示对象的类型
set($name,$config)	$config放入容器
get($name)	如果$name已经被实例化，直接返回，若未被实例化，则实例化放入容器并返回
insure($config,$defaultClass='')	动态组建

咱们一起来看一下yaf的Registry这个类，这是yaf代码提示中自带的类。

<?php
namespace Yaf ;

/**
 * <p>All methods of <b>\Yaf\Registry</b> declared as static, making it universally accessible. This provides the ability to get or set any custom data from anyway in your code as necessary.</p>
 * @link http://www.php.net/manual/en/class.yaf-registry.php
 */
final class Registry {

   /**
    * @var \Yaf\Registry
    */
   protected static $_instance;
   /**
    * @var array
    */
   protected $_entries;

   /**
    * @link http://www.php.net/manual/en/yaf-registry.construct.php
    */
   private function __construct(){ }

   /**
    * @link http://www.php.net/manual/en/yaf-registry.clone.php
    */
   private function __clone(){ }

   /**
    * Retrieve an item from registry
    *
    * @link http://www.php.net/manual/en/yaf-registry.get.php
    *
    * @param string $name
    *
    * @return mixed
    */
   public static function get($name){ }

   /**
    * Check whether an item exists
    *
    * @link http://www.php.net/manual/en/yaf-registry.has.php
    *
    * @param string $name
    *
    * @return bool
    */
   public static function has($name){ }

   /**
    * @link http://www.php.net/manual/en/yaf-registry.set.php
    *
    * @param string $name
    * @param mixed $value
    *
    * @return bool
    */
   public static function set($name, $value){ }

   /**
    * @link http://www.php.net/manual/en/yaf-registry.del.php
    *
    * @param string $name
    *
    * @return void|bool
    */
   public static function del($name){ }
}

下面咱们根据Registry这个类，创建实际项目中可以用到的DI容器

 

/**
 * Class ${小痴}
 * @package extend
 */
class Di
{
    private function __construct()
    {
    }
    private function __clone()
    {
        // TODO: Implement __clone() method.
    }

    /**
     * Notes:块赋值
     * User: 小痴
     * Date: 2019/3/18
     * Time: 13:17
     * @return void
     */
    public static function block($object,$properties=[])
    {
        foreach ($properties as $property => $value) {
            $object->$property = $value;
        }
    }

    /**
     * Notes:根据对象配置创建对象
     * User: 小痴
     * Date: 2019/3/18
     * Time: 13:16
     * @return mixed
     */
    public static function createObject($config)
    {
        $class = $config['class'];
        unset($config['class']);
        $object = new $class();
        self::block($object,$config);
        if(method_exists($object,'init')) {
            $object->init();
        }
        return $object;
    }

    /**
     * Notes:
     * User: 小痴
     * Date: 2019/3/18
     * Time: 13:17
     * @return bool
     */
    public static function set($name,$config)
    {
        return Registry::set($name,$config);
    }

    /**
     * Notes:
     * User: 小痴
     * Date: 2019/3/18
     * Time: 13:17
     * @return mixed
     */
    public static function get($name)
    {
        $object = Registry::get($name);
        if(is_array($object) && isset($object['class'])) {
            $instance = self::createObject($object);
            Registry::set($name,$instance);
            return $instance;
        }
        return $object;
    }

    /**
     * Notes:
     * User: 小痴
     * Date: 2019/3/18
     * Time: 13:17
     * @return array|mixed
     */
    public static function insure($config,$defaultClass=null)
    {
        if(is_array($config)) {
            if(isset($config['class'])) {
                return self::createObject($config);
            }
            if(isset($defaultClass)) {
                $config['class'] = $defaultClass;
                return self::createObject($config);
            }
        }
        return $config;
    }
}

举例：

在yaf中会有一个Bootstrap.php，在此文件中创建一个方法:

//获取一下DB

public function _initDb(\yaf\Dispatcher $dispatcher)

{

 $config = \Yaf\Application::$app()->getConfig();

\Yaf\Registry::set('config',$config);

}

我们在controller中创建一个testDb.php文件：

public function testAction（）

{

 $db = Di::get('config');

var_dumo（$db）；

}

这样就获取到了。

有想学习的同学们可以观看此视频： https://bbs.youkuaiyun.com/topics/392562522    https://edu.youkuaiyun.com/course/play/9933