Sample Asset Manager handling upload

AssetManager.php

<?php
namespace RE\AssetBundle\Model;

use Knp\Bundle\GaufretteBundle\FilesystemMap;
use Doctrine\ORM\EntityManager;

use Symfony\Component\HttpFoundation\File\UploadedFile;
use Symfony\Component\EventDispatcher\EventDispatcher;

use Gaufrette\FileStream\Local; 	 
use Gaufrette\StreamMode;

use RE\AssetBundle\Entity\Asset;
use RE\AssetBundle\Event\AssetProcessedEvent;

use Defrag\PluploadBundle\Model\UploaderInterface;

class AssetManager implements UploaderInterface {

	protected $fs_map;
	protected $fs;
	protected $em;
	protected $eventDispacher;

	public function __construct(FilesystemMap $fs_map, EntityManager $em, EventDispatcher $eventDispacher)	
	{
		$this->fs_map = $fs_map;
		$this->fs = $this->fs_map->get('asset_fs');
		$this->em = $em;	
		$this->eventDispacher = $eventDispacher;	
	}

	public function upload(UploadedFile $file)
	{	
		$a = $this->createAssetFromUploadedFile($file);		
		$this->em->persist($a);
		$this->em->flush();

		$name = $a->createUploadPath(); 	
		$a->createDirectoryPath();
		$this->em->persist($a);
		$this->em->flush();
		
		$this->fs->write($name, file_get_contents($file->getPathname()));

    	$this->eventDispacher->dispatch('re.asset.asset_processed', new AssetProcessedEvent($a));


    	return array(
		    'id' => $a->getId(), 
		    'originalFileName' => $a->getOriginalFileName(), 
		    'path' => $a->getPath()
        );

		
	}
	
	public function getFileSystem()
	{
		return $this->fs;
	}

	public function processThumbnails(Asset $asset)
	{
		//TODO: apply thumbnail processing
	}

	protected function createAssetFromUploadedFile(UploadedFile $file)
	{
		$a = new Asset();
		$a
		 	->setOriginalFileName($file->getClientOriginalName())
			->setContentType($file->getClientMimeType())
			->setFileSize($file->getClientSize())
			->setExtension($file->guessExtension())
			->createFileName()
		;	
		return $a;
	}

}

gistfile1.yml

services:
    re.asset_manager:
        class: RE\AssetBundle\Model\AssetManager
        arguments: [ "@knp_gaufrette.filesystem_map", "@doctrine.orm.entity_manager", "@event_dispatcher" ]