Symfony Cache: a premium recipe to fast apps

Introduced in version 3.1, the Symfony Cache component has 3 promises: performance, safety, and ease of use. Internally and by default, we are already using it out of the box for system caches. It started as a reference implementation of the PSR-6 standard. Along the years and by contributions from the community, it gained a battle-tested feature-set and adapters for many storages. But the next version, 4.2, is the bigger milestone. With some raw examples and benchmarks, let's review how to select the best backend for your needs, wire them in your apps, do tags-based invalidation, protect against cache stampede, etc. Caching might be the most efficient strategy to fast apps.

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1. Symfony Cache a premium recipe to fast apps #Symfony_Live @nicolasgrekas
3. PSR-6 Caching Interface PHP-FIG – Dec. 2015 Symfony 3.1 – May 2016
4. #Symfony_Live @nicolasgrekas • A common interface caching needs o With normalized error handling • Allow for multiple independent extensions PSR-6 Goals
5. #Symfony_Live @nicolasgrekas • doctrine/cache 70M • symfony/cache 6.5M • zendframework/zend-cache 4.5M • illuminate/cache 3.6M • tedivm/stash 1.4M Cache on Packagist
6. #Symfony_Live @nicolasgrekas PSR-6 CacheItemPoolInterface
7. #Symfony_Live @nicolasgrekas PSR-6 CacheItemInterface
8. #Symfony_Live @nicolasgrekas PSR-6 Typical Lifecycle
9. Symfony Cache What else?
10. #Symfony_Live @nicolasgrekas • A dual PSR-6 and PSR-16 implementation • With strict public API and error handling • With exclusive extra features • Tuned for performance • Following Symfony’s quality processes Symfony Cache
11. #Symfony_Live @nicolasgrekas • Runtime Memory • Filesystem • PHP code – one file per item • PHP code – one file with all items • APCu Symfony Cache – Local backends
12. #Symfony_Live @nicolasgrekas • Redis • Memcached • PDO/DBAL Symfony Cache – Remote backends
13. #Symfony_Live @nicolasgrekas • Chain • Doctrine • Proxy • Null • SimpleCache • Traceable Symfony Cache – Special backends
14. #Symfony_Live @nicolasgrekas Doctrine 834.863 items/ms PHP Cache 313.334 items/ms Stash PHP 55.346 items/ms Symfony 533.366 items/ms Symfony Cache – APCu Bench
15. #Symfony_Live @nicolasgrekas Doctrine 705.001 items/ms PHP Cache 362.477 items/ms Stash PHP 153.803 items/ms Symfony 845.910 items/ms Symfony Cache – APCu Bench
16. #Symfony_Live @nicolasgrekas Doctrine 34.061 items/ms Symfony 478.910 items/ms Symfony Cache – Redis Bench
17. #Symfony_Live @nicolasgrekas • by expiration • by tags • by versioning Symfony Cache – Invalidation strategies
18. #Symfony_Live @nicolasgrekas • igbinary compatibility • MarshallerInterface • Multi-hosts DSN Symfony Cache – Extra 4.2 features
19. Symfony Framework Wiring
20. #Symfony_Live @nicolasgrekas • cache.system = PHP7 array > APCu > files • Offline cache warm-ups for derived cache.validator/serializer/annotations • Fine tuned flex recipes for Doctrine Note: APCu warmup & reset handled properly Best wiring by default
21. Autowiring FTW! use Psr\Cache\CacheInterface; __construct(CacheInterface $cache) or @cache.app in yaml
22. #Symfony_Live @nicolasgrekas framework: cache: app: cache.adapter.redis default_redis_provider: 'redis://%env(REDIS_HOST)%' config/packages/framework.yaml
23. #Symfony_Live @nicolasgrekas framework: cache: pools: forecast.cache: adapter: cache.adapter.pdo config/packages/framework.yaml
24. @forecast.cache in yaml – 4.2 – CacheInterface $forecastCache
25. #Symfony_Live @nicolasgrekas Typical Cache Lifecycle
26. #Symfony_Live @nicolasgrekas Critical Cache Lifecycle
27. – 4.2 – $cache->get($key, $callback)
28. #Symfony_Live @nicolasgrekas
29. #Symfony_Live @nicolasgrekas Cache Stampede at Warm-up
30. #Symfony_Live @nicolasgrekas Cache Stampede at Warm-up
31. #Symfony_Live @nicolasgrekas
32. #Symfony_Live @nicolasgrekas Cache Stampede at Expiration https://en.wikipedia.org/wiki/Cache_stampede
33. – 4.2 – $cache->get($key, $callback, $beta = null)
34. #Symfony_Live @nicolasgrekas Get an item?
35. #Symfony_Live @nicolasgrekas Forcing NO-early expiration
36. #Symfony_Live @nicolasgrekas FORCING early expiration
37. #Symfony_Live @nicolasgrekas Deleting an item
38. $cache->get($key, $callback, $beta = null) – leverages PSR-6 under the hood – 99% of use cases covered!
39. #Symfony_Live @nicolasgrekas Deleting an item
40. – 4.2 – symfony/contracts
41. #Symfony_Live @nicolasgrekas • Cache\{CacheInterface, TagAwareInterface} • Translation\TranslatorInterface • Service\{ResetInterface, ServiceLocatorTrait, ServiceSubscriberInterface, ServiceSubscriberTrait} • v1.0 released at the end of November • README https://github.com/symfony/contracts Symfony\Contracts\
42. – 4.2 – use Symfony\Contracts\Cache\CacheInterface; public function __construct(CacheInterface $cache) $cache->get($key, $callback, $beta = null) $cache->delete($key)
43. #Symfony_Live @nicolasgrekas • Offline recomputation (DI+Messenger+Cache integration) • 1RTT Redis tag invalidation (joint effort with eZ Platform, they use it the most) What’s next?