basic protocol

<?php
/**
 * @namespace
 */
namespace Application\Service\Api\Protocol;
use Application\Service\Api as ApiService;
/**
 * Api Handler BasicProtocol
 *
 * @author miholeus
 */
class Basic extends AbstractProtocol
{
    /**
     *
     * @param string $action service and method name separated by "." symbol
     * @param array $params method params
     * @return mixed
     * @throws \Application\Service\Api\HandlerException
     * @throws \Application\Service\Api\Service\Exception
     */
    public function execute($action, $params)
    {
        $actionArr = explode(".", $action);
        $serviceName = $actionArr[0];
        // set default service action
        if(!isset($actionArr[1])) {
            $serviceAction = "version";
        } else {
            $serviceAction = $actionArr[1];
        }
        $className = '\\Application\\Service\\Api\\Service\\' . ucfirst($serviceName);
        if(!class_exists($className)) {
            throw new ApiService\HandlerException("Unknown service " . $serviceName);
        }
        /** @var $service \Application\Service\Api\Service\AbstractService */
        $service = new $className($this);

        if(!$service instanceof ApiService\ServiceInterface) {
            throw new ApiService\HandlerException("Service " . $serviceName . " should implement"
                    . " \\Application\\Service\\Api\\ServiceInterface");
        }

        if(!method_exists($service, $serviceAction)) {
            throw new ApiService\HandlerException(
                    sprintf("Unknown method %s in service %s", $serviceAction, $serviceName)
            );
        }

        $this->service = $service;
        $this->service->setParams($params);

        return call_user_func_array(array($service, $serviceAction), array($params));
    }
}