src/Router/HandlerMapping.php
private function getServiceKey(string $interfaceClass, string $version, string $method): string
    {
        return \sprintf('%s_%s_%s', $interfaceClass, $version, $method);
    }
private function getServiceKey(string $interfaceClass, string $version, string $method): string
    {
        return \sprintf('%s_%s_%s', $interfaceClass, $version, $method);
    }
private function getServiceKey ( string $ interfaceClass , string $ version , string $ method ) : string { return \ sprintf ( '%s_%s_%s' , $ interfaceClass , $ version , $ method ) ; }
Get service key

@param string $interfaceClass
@param string $version
@param string $method

@return string
Get service key