Symfony2条件服务声明 [英] Symfony2 conditional service declaration

问题描述

我目前正试图找到一个可靠的解决方案来动态更改Symfony2服务的依赖关系.详细说明:我有一个使用HTTP驱动程序与外部API进行通信的服务.

I'm currently trying to find a solid solution to change the dependencies of a Symfony2 service dynamically. In detail: I have a Services which uses a HTTP-Driver to communicate with an external API.

class myAwesomeService
{
    private $httpDriver;

    public function __construct(
        HTTDriverInterface $httpDriver
    ) {
        $this->httpDriver = $httpDriver;
    }

    public function transmitData($data)
    {
        $this->httpDriver->dispatch($data);
    } 
}

在CI上运行Behat测试时，我想使用httpMockDriver代替真正的驱动程序，因为外部API可能会关闭，运行缓慢甚至中断，并且我不想中断构建.

While running the Behat tests on the CI, I'd like to use a httpMockDriver instead of the real driver because the external API might be down, slow or even broken and I don't want to break the build.

此刻我正在做这样的事情:

At the moment I'm doing something like this:

<?php
namespace MyAwesome\TestBundle\DependencyInjection;

class MyAwesomeTestExtension extends Extension
{
    /**
     * {@inheritDoc}
     */
    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        $loader = new Loader\YamlFileLoader($container, new       
                     FileLocator(__DIR__.'/../Resources/config'));
        $environment = //get environment
        if ($environment == 'test') {
            $loader->load('services_mock.yml');         
        } else {
            $loader->load('services.yml');          
        }
    }
}

这暂时有效，但肯定会中断.因此，有没有更优雅/更可靠的方法来动态更改HTTPDriver?

This works for now, but will break for sure. So, is there a more elegant/solid way to change the HTTPDriver dynamically?

推荐答案

我终于找到了对我来说很可靠的解决方案.从Symfony 2.4开始，您可以使用表达式语法:使用表达语言

I finally found a solution that looks solid to me. As of Symfony 2.4 you can use the expression syntax: Using the Expression Language

所以我以这种方式配置了我的服务.

So I configured my service this way.

service.yml
parameters:
  httpDriver.class:       HTTP\Driver\Driver
  httpMockDriver.class:   HTTP\Driver\MockDriver
  myAwesomeService.class: My\Awesome\Service
service:
  myAwesomeService:
    class:        "%myAwesomeService.class%"
    arguments:    
      - "@=service('service_container').get('kernel.environment') == 'test'? service('httpMockDriver) : service('httpDriver)"

这对我有用.

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