New in Symfony 3.2: Tagged Cache
Contributed by
Nicolas Grekas
in #19047.
In Symfony 3.1 we added a new Cache component that was a strict implementation of the PSR-6: Caching Interface standard. In Symfony 3.2 we decided to improve the cache with some features not defined by the standard.
The first new feature is the tag-based invalidation to create tagged caches. Imagine that your application is an e-commerce application that stores users' reviews in the cache. When saving those reviews, you can now associate tags to them:
1 2 3 4 5 6 7 8 9 | use Symfony\Component\Cache\Adapter\FilesystemAdapter;
$cache = new FilesystemAdapter();
$review = $cache->getItem('reviews-'.$reviewId);
$review->set('...');
$review->tag(['reviews', 'products', 'product-'.$productId]);
$cache->save($review);
|
The cached review is associated with three different tags that can be used to invalidate related items:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | // the HTML structure of reviews has changed:
// invalidate all reviews
$cache->invalidateTags('reviews');
// a special sale is enabled in the store:
// invalidate anything related to products
$cache->invalidateTags('products');
// the data of the product #123 has changed:
// invalidate anything related to that product
$cache->invalidateTags('product-123');
// a major store update is being deployed:
// invalidate all the information related to products and reviews
$cache->invalidateTags(['products', 'reviews']);
// after invalidating any of the previous tags, the item is no longer
// available in the cache:
$cache->getItem('reviews-'.$reviewId)->isHit(); // returns false
|
The Cache component now defines a TagAwareAdapterInterface to add tag-based
invalidation to your own cache adapters and TaggedCacheItemInterface to
allow tagging cache items. In addition, it includes a TagAwareRedisAdapter
to enable tag-based invalidation when using Redis.
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