拥有带参数/参数的PHP DI / IoC容器

时间:2015-04-08 10:26:38

标签: php dependency-injection inversion-of-control containers ioc-container

我正在制作自己的练习框架,我坚持使用DI / IoC容器,并在构造函数中发送参数。

Container.php

class Container
{
    private $registry = array();
    private $shared = array();

    public function set($name, Closure $resolve)
    {
        if (!$this->exists($name)) {
            $this->registry[$name] = $resolve;
        } else {
            throw new Exception('Class with name ' . $name . ' is already registered.');
        }
    }

    public function get($name, $arguments = array())
    {
        if (!$this->exists($name, 'shared')) {
            $this->shared[$name] = $this->getNew($name, $arguments);
        }

        return $this->shared[$name];
    }

    public function getNew($name, $arguments = array())
    {
        if ($this->exists($name, 'registry')) {
            $class = $this->registry[$name];
            return $class();
        }

        throw new Exception('Class with name ' . $name . ' does not exist.');
    }

    private function exists($name, $type = 'registry')
    {
        return array_key_exists($name, $this->$type);
    }
}

用法:

$container = new Container;

$container->set('file', function() {
    return new Application\Library\File();
});

$container->set('cache', function($path, $type = 'json') use ($container) {
    return new Application\Library\Cache($container->get('file'), $path, $type);
});

$params = array (
    'path/to/cache/',
    'json'
);
$cache = $container->get('cache', $params);

问题是:我如何使用 get() getNew()方法向构造函数发送参数/参数。我看到 ReflectionClass($ classname) newInstanceArgs($ args),但我不知道如何使用它以及放置它的位置。

编辑 - 也许是这样的:

public function getNew($name, $arguments = array())
{
    if ($this->exists($name, 'registry')) {
        if (count($arguments) > 0) {
            $object = new ReflectionClass($name);
            return $object->newInstanceArgs($arguments);
        } else {
            $class = $this->registry[$name];
            return $class();
        }
    }

    throw new Exception('Class with name ' . $name . ' does not exist.');
}

但它不起作用,因为为了创建缓存类,我只使用 $ container-> get()和$ params数组注入3个参数中的2个。第一个参数在 $ container-> set()中使用文件类修复,并且在实例创建时无法正确注入。有没有解决方案?

错误: 可捕获的致命错误:传递给Application \ Library \ Cache :: __ construct()的参数1必须是Application \ Library \ File的一个实例,给定的字符串

1 个答案:

答案 0 :(得分:0)

可行的解决方案有效,但我对它不满意:

public function getNew($name, $arguments = array())
{
    if ($this->exists($name, 'registry')) {
        $class = $this->registry[$name];
        $count = count($arguments);
        switch ($count) {
            case 1:
                $object = $class($arguments[0]);
                break;
            case 2:
                $object = $class($arguments[0], $arguments[1]);
                break;
            case 3:
                $object = $class($arguments[0], $arguments[1], $arguments[2]);
                break;
            case 4:
                $object = $class($arguments[0], $arguments[1], $arguments[2], $arguments[3]);
                break;
            default:
                $object = $class();
                break;
        }
        return $object;
    }

    throw new Exception('Class with name ' . $name . ' does not exist.');
}

计算$参数的数量,通过switch case并返回带有注入参数的$ classname实例。