用于函数驱动应用程序的PHPDI模式

我有一些类需要将依赖项注入到它们的构造函数中。这允许我为测试注入模拟（例如来自）

我对使用容器来帮助配置和访问这些对象感兴趣，我已经研究过了（我也研究过了，尽管我无法快速解决这些问题）

到目前为止一切都很好但是，我遇到的问题是，应用程序（Drupal 7）是围绕数千个函数构建的，这些函数不属于可以将依赖项注入的对象

因此，我需要这些函数才能从容器访问服务。此外，出于测试目的，我需要用mock和新mock替换服务

因此，模式如下所示：

<?php
/**
  * Some controller class that uses an injected mailing service.
  */
class Supporter
{
  protected $mailer;

  public function __construct(MailingServiceInterface $mailer) {
     $this->mailer = $mailer;
  }

  public function signUpForMalings($supporter_id) {
     $email = $this->getSupporterEmail($supporter_id);
     $this->mailer->signup($email);
  }
}

虽然我承认这是在各种全球功能中使用容器作为服务定位器，但鉴于平台的性质，我认为这是不可避免的。如果有更干净的方法，请告诉我

不过，我的主要问题是：

---

注入mock有一个问题，因为mock需要为各种测试进行更改。假设我调出了mailer服务（在Pimple中：

$container->offsetUnset（'mailer'）；$container['mailer']=$mock_mailer；

），但是如果Pimple已经实例化了

supporter

服务，那么该服务将拥有旧的、未修改的mailer对象。这是container软件或一般容器模式的局限性，还是我做得不对，还是因为旧的以功能为中心的应用程序造成了混乱？

在没有任何其他建议的情况下，这就是我所追求的

容器使用

Pimple\Psr11\ServiceLocator

我用的是粉刺，所以容器的工厂看起来像这样

<?php
use Pimple\Container;
use Pimple\Psr11\ServiceLocator;

$container = new Container();
$container['mailer'] = function ($c) { return new SomeMailer(); }
$container['supporters'] = function ($c) {
  // Create a service locator for the 'Supporters' class.
  $services = new ServiceLocator($c, ['mailer']);
  return new Supporter($services);
}

<?php
/**
  * example function requires mailer service.
  */
function is_signed_up($email) {
   global $container;
   return $container->get('mailer')->isSignedUp($email);
}

<?php
/**
  * example function that uses both the above functions
  */
function sign_em_up($email, $supporter_id) {
  if (!is_signed_up($email)) {
    my_form_submit(['supporter_id'=>$supporter_id);
    return TRUE;
  }
}

 <?php
public testSignUpNewPerson() {
   $mock_mailer = createAMockMailer()
     ->thatWill()
     ->return(FALSE)
     ->whenFunctionCalled('isSignedUp', 'wilma@example.com');

   // Somehow install the mock malier in the container.

   $result = sign_em_up('wilma@example.com', 123);
   $this->assertTrue($result);
}

// ... imagine other tests which also need to inject mocks.

<?php
use Pimple\Container;
use Pimple\Psr11\ServiceLocator;

$container = new Container();
$container['mailer'] = function ($c) { return new SomeMailer(); }
$container['supporters'] = function ($c) {
  // Create a service locator for the 'Supporters' class.
  $services = new ServiceLocator($c, ['mailer']);
  return new Supporter($services);
}

<?php
use \Pimple\Psr11\ServiceLocator;
/**
  * Some controller class that uses an injected mailing service.
  */
class Supporter
{
  protected $services;

  public function __construct(ServiceLocator $services) {
     $this->services = $services;
  }

  // This is a convenience function.
  public function __get($prop) {
    if ($prop == 'mailer') {
      return $this->services->get('mailer');
    }
    throw new \InvalidArgumentException("Unknown property '$prop'");
  }

  public function signUpForMalings($supporter_id) {
     $email = $this->getSupporterEmail($supporter_id);
     $this->mailer->signup($email);
  }
}

<?php
class SomeTest extends \PHPUnit\Framework\TestCase
{
   function testSupporterGetsMailed() {
      global $container;

      $supporter = $container['supporter'];

      // e.g. mock the mailer component
      $container->offsetUnset('mailer');
      $container['mailer'] = $this->getMockedMailer();

      // Do something with supporter.
      $supporter->doSomething();

      // ...
   }
}