Configuring third party service in my CompilerPass - php

Question

I'm using Symfony 2.7 and I want to configure some service by adding configurator to it. I follow instructions on http://symfony.com/doc/current/components/dependency_injection/configurators.html, but I want to add my configurator to that service in my CompilerPass.
I wrote the following code:
$container->getDefinition('exercise_html_purifier.config.default')
->setConfigurator([
$container->getDefinition('application.exercise_html_purifier.config_configurator')->getClass(),
'configure'
]);
where application.exercise_html_purifier.config_configurator is id of my configurator service. This code works as expected, but of course it is also triggers php's warning:
DEPRECATED - Non-static method Application\Service\ExerciseHTMLPurifier\Configurator\ConfigConfigurator::configure() should not be called statically, assuming $this from incompatible context
because the configure method is not static in my case. I can't figure out, how to tell symfony to set non-static configurator callback.
I tried to set it like this:
$container->getDefinition('exercise_html_purifier.config.default')
->setConfigurator([
$container->get('application.exercise_html_purifier.config_configurator'),
'configure'
]);
but got this error:
ContextErrorException in XmlDumper.php line 201:
Warning: DOMElement::setAttribute() expects parameter 2 to be string, object given
I even tried to use the following syntax:
$container->getDefinition('exercise_html_purifier.config.default')
->setConfigurator([
'#application.exercise_html_purifier.config_configurator',
'configure'
]);
but also got error
FatalErrorException in appDevDebugProjectContainer.php line 2992:
Parse Error: syntax error, unexpected '#', expecting identifier (T_STRING)
What I'm doing wrong?
Thanks.

Answer 1

OK, I've read the source of \Symfony\Component\DependencyInjection\Dumper\XmlDumper::addService() and found that one of the solutions is to pass Definition instead of instance:
$container->getDefinition('exercise_html_purifier.config.default')
->setConfigurator([
$container->getDefinition('application.exercise_html_purifier.config_configurator'),
'configure'
]);