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Strategy pattern in Symfony2
$somePageType = new PageType(...);
$this->get('page.service')->render($somePagetype);

// This is the page.service class
class MyPageService {

    public function render(PageTypeInterface $page_type) {
        $page_type->setContainer($this->container);

        // do stuff
    }
}

// This is the type strategy
class MyStrategyType extends ContainerAware implements PageTypeInterface {
    // you can access the container after MyPageService has injected it.
}

class MyPageService {

    public function render(PageTypeInterface $page_type) {
        $page_type->setService($this->container->get('my_service'));

        // do stuff
    }
}