Adapters For Interoperability between PSR-6 and PSR-16 Cache

Warning: You are browsing the documentation for Symfony 7.0, which is no longer maintained.

Read the updated version of this page for Symfony 7.1 (the current stable version).

Sometimes, you may have a Cache object that implements the PSR-16 standard, but need to pass it to an object that expects a PSR-6 cache adapter. Or, you might have the opposite situation. The cache component contains two classes for bidirectional interoperability between PSR-6 and PSR-16 caches.

Using a PSR-16 Cache Object as a PSR-6 Cache

Suppose you want to work with a class that requires a PSR-6 Cache pool object. For example:

        1
2
3
4
5
6
7
8
9
10
11
12
13
        use Psr\Cache\CacheItemPoolInterface;

// just a made-up class for the example
class GitHubApiClient
{
    // ...

    // this requires a PSR-6 cache object
    public function __construct(CacheItemPoolInterface $cachePool)
    {
        // ...
    }
}
    

But, you already have a PSR-16 cache object, and you'd like to pass this to the class instead. No problem! The Cache component provides the Psr16Adapter class for exactly this use-case:

        1
2
3
4
5
6
7
8
9
        use Symfony\Component\Cache\Adapter\Psr16Adapter;

// $psr16Cache is the PSR-16 object that you want to use as a PSR-6 one

// a PSR-6 cache that uses your cache internally!
$psr6Cache = new Psr16Adapter($psr16Cache);

// now use this wherever you want
$githubApiClient = new GitHubApiClient($psr6Cache);
    

Using a PSR-6 Cache Object as a PSR-16 Cache

Suppose you want to work with a class that requires a PSR-16 Cache object. For example:

        1
2
3
4
5
6
7
8
9
10
11
12
13
        use Psr\SimpleCache\CacheInterface;

// just a made-up class for the example
class GitHubApiClient
{
    // ...

    // this requires a PSR-16 cache object
    public function __construct(CacheInterface $cache)
    {
        // ...
    }
}
    

But, you already have a PSR-6 cache pool object, and you'd like to pass this to the class instead. No problem! The Cache component provides the Psr16Cache class for exactly this use-case:

        1
2
3
4
5
6
7
8
9
10
11
        use Symfony\Component\Cache\Adapter\FilesystemAdapter;
use Symfony\Component\Cache\Psr16Cache;

// the PSR-6 cache object that you want to use
$psr6Cache = new FilesystemAdapter();

// a PSR-16 cache that uses your cache internally!
$psr16Cache = new Psr16Cache($psr6Cache);

// now use this wherever you want
$githubApiClient = new GitHubApiClient($psr16Cache);
    

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

TOC

Version