gistfile1.php

<?php
use Bosnadev\Repositories\Contracts\RepositoryInterface;

class MovieCacheRepo implements RepositoryInterface
{
    public function __construct(RepositoryInterface $repo, MyCustomCache $cache, MyCustomCacheKeyGenerator $keygen)
    {
        $this->repo = $repo;
        $this->cache = $cache;
        $this->keygen = $keygen;
    }
    
    /*
     * @return \Illuminate\Support\Collection
     */
    public function findBy($attribute, $value, $columns = array('*'))
    {
        // here I will generate a cache key base on $attribute and $value
        // for example $attribute = 'category'  $value = 'horror'
        // my keygen will generate something like: move.list.category.horror 
        $key =  $this->keygen->getCacheKey($attribute, $value);

        // if my cache exists , no need to find in database
        if ($this->cache->has($key)) {

            return $this->cache->fetch($key);
        }
        // no cache, look into database
        $entries = $this->repo-findBy($attribute, $value, $columns);

        // cache the result
        $this->cache->remember($key, $entries, 30);

        return $entries;
    }
}

$repo = new MovieCacheRepo(new MyFakeMovieDatabaseRepository, new MyFakeCache, new MyFakeCacheKeyGenerator);
$repo->findBy('category', 'horror'); // no cache so it will queue database, cache key move.list.category.horror
$repo->findBy('category', 'horror'); // have cache so it only fetch cache data

// things getting complicate when I using Criteria
$criteria = new LengthOverTwoHours();  //$model->where('length', '>', 120);
$dbRepo = new MyFakeMovieDatabaseRepository;
$dbRepo->pushCriteria($criteria);
$repo = new MovieCacheRepo($dbRepo, new MyFakeCache, new MyFakeCacheKeyGenerator);
//MovieCacheRepo will never know what happen in criteria
$repo->findBy('category', 'horror'); // cache key still move.list.category.horror so it will still fetch from cache