ProfileFinder.php

<?php

namespace Acme\Services;

use Doctrine\Common\Cache\ArrayCache;
use Doctrine\Common\Cache\Cache;
use Doctrine\ORM\EntityRepository;
use Kunstmaan\AdminBundle\Entity\User;
use Acme\Entity\Profile;

class ProfileFinder
{
    /**
     * @var EntityRepository
     */
    private $repository;

    /**
     * @var Cache
     */
    private $cache;

    public function __construct(EntityRepository $repository, Cache $cache = null)
    {
        $this->repository = $repository;
        $this->cache = $cache ?: new ArrayCache();
    }

    /**
     * @param User|null $user
     * @return Profile
     */
    public function getProfile(User $user = null)
    {
        if (null !== $user && $this->cache->contains($user->getEmailCanonical())){
            return $this->cache->fetch($user->getEmailCanonical());
        }

        $profile = ($user ? $this->repository->findOneBy(['user' => $user]) : null) ?: new Profile;

        $this->cache->save($user->getEmailCanonical(), $profile);

        return $profile;
    }
}