createLoggerHandler example

protected function processPlugin(ContainerBuilder $container, string $servicePrefix): void
    {
        if (!$container->hasParameter($logLevel = $this->getParameterNameLogLevel($servicePrefix))) {
            $container->setParameter($logLevel, $container->getParameter('shopware.logger.level'));
        }

        if (!$container->hasParameter($logMaxFiles = $this->getParameterNameLoggerMaxFiles($servicePrefix))) {
            $container->setParameter($logMaxFiles, 14);
        }

        $container->setDefinition($this->getServiceIdLoggerHandler($servicePrefix), $this->createLoggerHandler($servicePrefix));
        $container->setDefinition($this->getServiceIdLoggerFormatter($servicePrefix), $this->createLoggerFormatter());
        $container->setDefinition($this->getServiceIdLogger($servicePrefix), $this->createLogger($servicePrefix));
    }

    protected function createLoggerHandler(string $servicePrefix): Definition
    {
        return (new Definition(RotatingFileHandler::class, [
                sprintf('%%kernel.logs_dir%%/%s_%%kernel.environment%%.log', $servicePrefix),
                sprintf('%%%s%%', $this->getParameterNameLoggerMaxFiles($servicePrefix)),
                sprintf('%%%s%%', $this->getParameterNameLogLevel($servicePrefix)),
            ]))