How to cache in Symfony 2?

问题:

I need to cache some application specific data using Symfony 2's caching system so that I can run cache:clear to clear it. All the cache relies under app/cache but how do I actually go about caching data?

http://symfony.com/doc/current/cookbook/index.html

The only topic I see is about HTML caching with Varnish.

回答1:

If you are using Doctrine already just use those cache classes.

Add a service to config.yml:

services:
    cache:
        class: Doctrine\Common\Cache\ApcCache

And use it in your controller:

if ($fooString = $this->get('cache')->fetch('foo')) {
    $foo = unserialize($fooString);
} else {
    // do the work
    $this->get('cache')->save('foo', serialize($foo));
}

回答2:

Simple way use Doctrine cache providers. At first, register service(sample in config.yml):

services:
    memcached:
        class: Memcached
        calls:
            - [ addServer, ['localhost', 11211] ]
    memcached_cache:
        class: Doctrine\Common\Cache\MemcachedCache
        calls:
            - [ setMemcached, [@memcached] ]

Then to use get service, for example in controler:

$cache = $this->get('memcached_cache');

to send in another service use calls:

calls:
    - [ setCacheProvider, [@memcached_cache] ]

or arguments:

arguments:
    - @memcached_cache

In the same way, you can use other interfaces of Doctrine Cache package. Doctrine Cache provides a very simple interface for which several out of the box implementations are provided:

• ApcCache (requires ext/apc)
• ArrayCache (in memory, lifetime of the request)
• FilesystemCache (not optimal for high concurrency)
• MemcacheCache (requires ext/memcache)
• MemcachedCache (requires ext/memcached)
• PhpFileCache (not optimal for high concurrency)
• RedisCache.php (requires ext/phpredis)
• WinCacheCache.php (requires ext/wincache)
• XcacheCache.php (requires ext/xcache)
• ZendDataCache.php (requires Zend Server Platform)

If you do not already use Doctrine, you may require Common Library for Doctrine projects: php composer.phar require doctrine/common or require only Caching library offering an object-oriented API for many cache backends: php composer.phar require doctrine/cache

How to use Doctrine Caching you can read in Doctrine Common documentation on Doctrine Project web site

回答3:

Symfony 3.1 provide a new Cache component.

回答4:

Symfony2 does not provide any component for application layer caching.

Like you were already told, you can use the Doctrine Common caching library http://docs.doctrine-project.org/projects/doctrine-common/en/latest/reference/caching.html

If you want something more advanced, you can also use one of the cache bundle provided by the community. For instance, the https://github.com/TheBigBrainsCompany/TbbcCacheBundle#cachebundle which provides tools for a good caching strategy.

回答5:

There is no partial cache in Symfony2, the build-in cache is full HTTP only. You have to use a reverse proxy, and if you only want to cache a piece of code, you have to use ESI. It's maybe more work than with symfony 1 but performances worth it.

Anyway, nothing stop you to use a memcached and store some stuff in it, look at this Bundle i.e. If as your question state it, you only have data to store, that's perfect (and a memcache cache is much faster than a filesystem one).