dep injection

lolcatz.php

protected $_serviceFactory;

/**
 *You can inject a mock factory here for unit testing
 *
 */
public function setServiceFactory(ServiceFactory $serviceFactory)
{
    $this->_serviceFactory = $serviceFactory;
}

/**
 *@returns Module\Service\A
 */
private function _getServiceA()
{
   if (null != $this->_serviceA) {
      $this->_serviceA = $this->_serviceFactory->get('module_service_a');
   }
   return $this->_serviceA;
}