<?php

class CRelay {
    private $configReader;
    public function setConfigReader(ConfigReaderInterface $configReader)
    {
       $this->configReader = $configReader;
    }

    public function jakasTamAkcja()
    {
      $username = $this->configReader->get('username');
      $password = $this->configReader->get('password');
    }
}