AsseticBundle\Service::getAssetManager PHP Method

    public function getAssetManager()
    {
        if (null === $this->assetManager) {
            $this->assetManager = new AssetManager();
        }
        return $this->assetManager;
    }

 /**
  * Executes the current command.
  *
  * @param InputInterface  $input  An InputInterface instance
  * @param OutputInterface $output An OutputInterface instance
  *
  * @return null|int null or 0 if everything went fine, or an error code
  */
 protected function execute(InputInterface $input, OutputInterface $output)
 {
     $config = $this->assetic->getConfiguration();
     $config->setBuildOnRequest(true);
     $this->assetic->build();
     $this->assetic->getAssetWriter()->writeManagerAssets($this->assetic->getAssetManager());
 }