gistfile1.php

<?php
class SomeController extends AbstractController
{

    protected $someService;

    public function indexAction()
    {
        $service = $this->getSomeService();
    }

    public function getSomeService()
    {
        if (!$this->someService) {
            $this->someService = $this->getServiceLocator()->get('Get\Your\Service');
        }
        return $this->someService;
    }
}