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Data Cache Managementin PHP

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About me

https://www.facebook.com/yatsencohttps://github.com/anyt

about me…

Andrey Yatsenco

● PHP Developer at Oro Inc.● 3 years with Symfony ● 6 years with PHP

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Data Cache Management in PHP

In this presentation● Everything about cache● Full-page cache● Browser cache. HTTP cache● Basics about cache● About data cache● Common pitfalls

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Data Cache Management in PHP

Cache is the temporary storage where frequently asked or expensive computed data can be stored for faster access

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Data Cache Management in PHP

Caching concepts● Unique cache key● Lifetime● Clearing cache data by key

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Data Cache Management in PHP

Cache key● All data identified by the key● Key should be unique systemwide● It’s good idea to use key prefixes

(namespaces)○ Application namespace○ Specific data namespace

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Data Cache Management in PHP

Lifetime (TTL)● Expiration DateTime● In seconds from save

○ internally DateTime used too

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Data Cache Management in PHP

Clearing cache data by key:● Key should be unique● Cache systems should provide ability to

delete data by key

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Data Cache Management in PHP

Why to cache?● Reduce number of requests to database● Reduce number of requests to external

resources (API, etc)● Reduce number of requests to slow storage

(like file system)● Reduce expensive computing data

recalculation● You suppose to have high load

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Data Cache Management in PHP

Cache alternatives?● Code refactoring

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Data Cache Management in PHP

Cache strategies:● Frontend cache● Backend cache

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Data Cache Management in PHP

Frontend Cache strategies:● Page cache in browser● Offline website cache● Data cache

○ Cookie ○ Local Storage

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Data Cache Management in PHP

Backend Cache strategies:● Entire page cache● Parts of the page● Opcode-cache● Store sql-queries result● Store complex php computing result● You custom

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Data Cache Management in PHP

In Symfony before using data cache, it’s good idea to enable default cache that works out of the box

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Data Cache Management in PHP

Quick speed up Symfony application:

● Production mode for AppKernel● use AppCache in front controller● Doctrine Metadata cache● Doctrine Query cache (not query result)● composer dump-autoload --optimize● Enable OpCode cache

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Data Cache Management in PHP

Next: Symfony HTTP cache for shared pages:Based on HTTP request headers● Reverse proxy cache● ESI cache● Browser cache

http://symfony.com/doc/current/book/http_cache.html

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Data Cache Management in PHP

When to use Data cache?

● Displays different

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Data Cache Management in PHP

Doctrine Query Result cache

● You need to configure it per query

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Data Cache Management in PHP

Doctrine Query Result cache● Clearing cache by ID

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Data Cache Management in PHP

Custom Data Cache● Expensive data computing● External resources results● Your custom data

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Data Cache Management in PHP

Custom Data Cache● Doctrine Cache component● Symfony 3.1 Cache component (PSR-6)● PHP-Cache (PSR-6 + steroids)

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Data Cache Management in PHP

Doctrine Cache component● Use DoctrineCacheBundle to connect

with Symfony '< 3.1'● Used internally in Doctrine ORM● Can be used without Doctrine ORM at all

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Data Cache Management in PHP

Doctrine Cache componentSupported providers:

● APC● CouchBase● Filesystem● MongoDB● Memcache● Memcached

● Redis● Riak● SQLite3● WinCache● xCache● Zend Data Cache

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Data Cache Management in PHP

Doctrine Cache componentSupported providers:

● Array○ In memory cache that resets every request

● Chain○ Chain of several caches, from fast and expensive to slow and cheap

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Data Cache Management in PHPDoctrine Cache component usage example:

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PSR-6 standardThe goal of this PSR is to allow developers to create cache-aware libraries that can be integrated into existing frameworks and systems without the need for custom development.

Data Cache Management in PHP

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PSR-6 standardKey concepts:● Items● Pool

Data Cache Management in PHP

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Data Cache Management in PHPPSR-6 standard

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Data Cache Management in PHPPSR-6 standard

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Data Cache Management in PHP

Symfony cache component (from SF3.1)https://github.com/symfony/cache ● Strict PSR-6 implementation● Very simple and fast● Has doctrine/cache proxy adapter for

advanced features

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Extra cache features● Tags

○ Tags is used to control the invalidation of items.

● Hierarchy○ Think of a hierarchy like a file system. If you remove a folder "Foo",

all items and folders in "Foo" will also be removed

Data Cache Management in PHP

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Extra cache features● Tags● Hierarchy

Not supported by doctrine or symfony cache components● Perhaps will be implemented in

doctrine/cache 2.0

Data Cache Management in PHP

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Extra cache features● Tags● Hierarchy

PHP-Cache library (PSR-6)php-cache.com

Data Cache Management in PHP

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PHP-Cache Tags usage example:

Data Cache Management in PHP

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PHP-Cache Hierarchy usage example:

Data Cache Management in PHP

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Data Cache Management in PHP

Pitfalls● Premature optimization● Caching only optimization● Inability to easy invalidate cache item● Cache slam● Relying on cache data● Inconsistency● Cache works slower then cache target

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Data Cache Management in PHP

Links:Psr-6

● www.php-fig.org/psr/psr-6/ Doctrine cache

● http://doctrine-orm.readthedocs.io/projects/doctrine-orm/en/latest/reference/caching.html● http://symfony.com/doc/current/bundles/DoctrineCacheBundle/index.html

Symfony cache component● https://github.com/symfony/cache

PHP-Cache project● http://www.php-cache.com/en/latest/

Sergey Zhuravel presentation about scalability:● http://www.slideshare.net/sergeyz/scalability-58564573

Vitaly Berdylo presentation about Symfony Performance● http://www.slideshare.net/vitaliyberdylo/symfony2-performance-issues-and-improvements

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