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Caching with PSRs at PHP Tour

Caching with PSRs at PHP Tour

In this talk you will learn what PSR-6 and PSR-16 are, why they are designed like they are, what the differences are, and how to use them. From the provided interfaces, the virtual package on Packagist.org, to the implementations available. Everything will be explained for both beginners and more experienced developers. We will dive into implementations, cache stampede protection, all using libraries we can find on Packagist.org. We will also show how to start using it today in our current applications by using adapters. The entire talk will be accompanied with code samples and live demos, showing both working and failing caching systems.

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Hannes Van De Vreken

May 18, 2018
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Transcript

  1. Caching with PSRs PHP Tour Montpellier #phptour @hannesvdvreken

  2. Hi, my name is Hannes.

  3. Caching PSRs Caching in PHP anno 2018

  4. 1. Intro 2. Caching in 2015 3. Hello PSR-6 4.

    Hello PSR-16
  5. 1. Intro what is caching?

  6. WHAT IS CACHING Speeding up your app

  7. WHAT IS CACHING 1. Query stored value 2.Execute slow task

    3.Remember result
  8. WHAT IS CACHING Should not cause app failure

  9. WHAT IS CACHING - EXAMPLES • HTTP Request • Slow

    DB call • Process image/zip/…
  10. WHAT IS CACHING Should not cause app failure

  11. WHAT IS CACHING geocode IP check cache store result check

    cache
  12. WHAT IS CACHING Should not cause app failure

  13. WHAT IS CACHING At different layers: User-Agent Webserver (Varnish/Nginx) Application

    Opcache
  14. WHAT IS CACHING Should not cause app failure

  15. WHAT IS CACHING • cache busting • TTL • warming

    up
  16. 2. Caching in 2015 the state of caching (pre PSR-FIG)

  17. APPLICATION CACHING IN 2015 1. Libraries do it 2.Frameworks do

    it 3.Cache libs do it
  18. APPLICATION CACHING IN 2015 Frameworks & cache libs have their

    own: - set of supported caching back- ends - maybe an interface to allow custom implementations
  19. APPLICATION CACHING IN 2015 Adapters everywhere!

  20. APPLICATION CACHING IN 2015 Framework X cache Framework Y cache

    Package W cache Cache package Z Adapter W->X Adapter W->Y Adapter W->Z Adapter Y->Z
  21. APPLICATION CACHING IN 2015 If no adapter available - Write

    your own - Store in different cache stores
 (ops will not love you for that)
  22. 3. Hello PSR-6

  23. INTRODUCING PSR-6 Finalized & accepted in December 2015

  24. INTRODUCING PSR-6 Repository - Entity

  25. INTRODUCING PSR-6 use Psr\Cache\CacheItemPoolInterface; use Psr\Cache\CacheItemInterface; $item = $pool->getItem($key); $item->getKey();

    $item->get();
  26. INTRODUCING PSR-6 Item is an entity, it’s not immutable, but

    the Key is
  27. INTRODUCING PSR-6 Don’t instantiate your own Items. $item = $pool->getItem(‘key’)

    ->set($value) ->expiresAfter(3600); $pool->save($item);
  28. INTRODUCING PSR-6 Pool has support for multi-actions $pool->getItems($keys); $pool->saveDeferred($item); $pool->commit();

  29. INTRODUCING PSR-6 Repository - Entity model allows extensions

  30. INTRODUCING PSR-6 Allows future specced features by reserving characters -

    {}()/\@:
  31. INTRODUCING PSR-6 Cache features: - Stampede protection: Parallel incoming requests

    executing long process to update cache value
  32. STAMPEDE PROTECTION

  33. STAMPEDE PROTECTION

  34. STAMPEDE PROTECTION

  35. STAMPEDE PROTECTION

  36. STAMPEDE PROTECTION

  37. STAMPEDE PROTECTION

  38. STAMPEDE PROTECTION

  39. STAMPEDE PROTECTION

  40. STAMPEDE PROTECTION

  41. INTRODUCING PSR-6 Cache features: - Stampede protection - Taggable cache

    cache/taggable-cache
  42. INTRODUCING PSR-6 Cache features: - Stampede protection - Taggable cache

    $item->setTags([‘cat-1']); $pool->invalidateTags([‘cat-1’]);
  43. INTRODUCING PSR-6 Cache features: - Stampede protection - Taggable cache

    - Hierarchical cache cache/hierarchical-cache
  44. INTRODUCING PSR-6 Cache features: - Stampede protection - Taggable cache

    - Hierarchical cache $pool->hasItem('|users|4711|followers'); // true $pool->delete(‘|users|4711'); $pool->hasItem('|users|4711|followers'); // false
  45. Practical who uses it, and how can I use it?

  46. None
  47. None
  48. None
  49. START USING IT Integration tests for implementations: cache/integration-tests

  50. None
  51. START USING IT class PoolIntegrationTest extends CachePoolTest { public function

    createCachePool() { return new MyCustomCachePool(); } }
  52. START USING IT cache/taggable-cache cache/namespaced-cache cache/hierarchical-cache cache/chain-adapter cache/array-adapter cache/void-adapter cache/prefix-adapter

  53. START USING IT - UPGRADE Upgrade paths

  54. START USING IT - UPGRADE Libraries

  55. START USING IT - UPGRADE Libraries (next major versions) have

    a PSR-6 caching decorator
  56. START USING IT - UPGRADE Frameworks

  57. START USING IT - UPGRADE Start using PSR-6 enabled libraries

    with adapters for current FW’s implementation.
  58. START USING IT - UPGRADE Example: symfony/cache cache/illuminate-adapter

  59. START USING IT Adoption?

  60. None
  61. 4. Hello PSR-16

  62. INTRODUCING PSR-16 Finalised & accepted in December 2016

  63. One simple interface INTRODUCING PSR-16

  64. Psr\SimpleCache\CacheInterface INTRODUCING PSR-16

  65. // Returns null when not available. // Returns null when

    you set it to null. $cache->set($key, null); $value = $cache->get($key); // null INTRODUCING PSR-16
  66. $cache->set($key, new ValueObject()); INTRODUCING PSR-16

  67. CacheInterface::getMultiple CacheInterface::setMultiple CacheInterface::deleteMultiple INTRODUCING PSR-16

  68. Differences from PSR-6 - No `null` values - No deferring

    INTRODUCING PSR-16
  69. Also allows future extension thanks to reservation of characters -

    {}()/\@: INTRODUCING PSR-16
  70. Practical who uses it, and how can I use it?

  71. None
  72. None
  73. START USING IT Upgrade path? Same as PSR-6

  74. START USING IT Adoption?

  75. None
  76. None
  77. None
  78. $laravelCache = App::make(‘cache’); $psr6Cache = new IlluminateCachePool($laravelCache); $psr16Cache = new

    SimpleCacheBridge($psr6Cache); INTRODUCING PSR-16
  79. 1. Intro 2. Caching in 2015 3. Hello PSR-6 4.

    Hello PSR-16 RECAP
  80. Thank you! #phptour @hannesvdvreken

  81. Time for questions! #phptour @hannesvdvreken