README

Providing PSR-6 and PSR-16 caches for PHP applications.

Table of Contents

• Getting started
  • Requirements
  • Highlights
• Documentation
  • PSR 6 Cache
    • Available Cache Item Pools
      • File Storage Cache Item Pool
      • Storage Cache Item Pool
      • Array Cache Item Pool
      • Psr16 Cache Item Pool
    • Cache Item Pools
    • Interfaces
      • Cache Item Pool Factory Interface
      • Cache Item Pools Interface
  • PSR 16 Simple Cache
    • Available Caches
      • Psr6 Cache
    • Caches
    • Interfaces Simple
      • Cache Factory Interface
      • Caches Interface
  • Shared Interfaces
    • Can Delete Expired Items
• Credits

Getting started

Add the latest version of the cache service project running this command.

composer require tobento/service-cache

Requirements

• PHP 8.4 or greater

Highlights

• Framework-agnostic, will work with any project
• Decoupled design

Documentation

PSR 6 Cache

Available Cache Item Pools

File Storage Cache Item Pool

The file storage cache item pool using the File Storage Service to store the items.

First, you will need to install service-file-storage:

composer require tobento/service-file-storage

Then, create the File Storage you wish to use for pool:

use Tobento\Service\Cache\FileStorageCacheItemPool;
use Tobento\Service\Cache\CanDeleteExpiredItems;
use Tobento\Service\Clock\SystemClock;
use Tobento\Service\FileStorage\StorageInterface;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Clock\ClockInterface;

$pool = new FileStorageCacheItemPool(
    
    // Any storage where to store cache items:
    storage: $storage, // StorageInterface
    
    // A path used as the path prefix for the storage:
    path: 'cache', // string
    
    // The clock used for calculating expiration:
    clock: new SystemClock(), // ClockInterface
    
    // The default Time To Live in seconds, null forever:
    ttl: null, // null|int
);

var_dump($pool instanceof CacheItemPoolInterface);
// bool(true)

var_dump($pool instanceof CanDeleteExpiredItems);
// bool(true)

Check out the Can Delete Expired Items interface to learn more about it.

Storage Cache Item Pool

The storage cache item pool using the Storage Service to store the items.

First, you will need to install service-storage:

composer require tobento/service-storage

Then, create the Storage you wish to use for pool:

use Tobento\Service\Cache\StorageCacheItemPool;
use Tobento\Service\Cache\CanDeleteExpiredItems;
use Tobento\Service\Clock\SystemClock;
use Tobento\Service\Storage\StorageInterface;
use Tobento\Service\Storage\JsonFileStorage;
use Tobento\Service\Storage\Tables\Tables;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Clock\ClockInterface;

// Create the storage:
$tables = new Tables();
$tables->add('cache_items', ['id', 'data', 'expiration', 'namespace'], 'id');

$storage = new JsonFileStorage(
    dir: __DIR__.'/tmp/',
    tables: $tables
);

$pool = new StorageCacheItemPool(
    
    // Any storage where to store cache items:
    storage: $storage, // StorageInterface
    
    // A namespace used as prefix for cache item keys:
    namespace: 'default', // string
    
    // The clock used for calculating expiration:
    clock: new SystemClock(), // ClockInterface
    
    // The default Time To Live in seconds, null forever:
    ttl: null, // null|int
    
    // Specify the table name:
    table: 'cache_items', // string
);

var_dump($pool instanceof CacheItemPoolInterface);
// bool(true)

var_dump($pool instanceof CanDeleteExpiredItems);
// bool(true)

Check out the Can Delete Expired Items interface to learn more about it.

Recommended table column types for (database) storage

Array Cache Item Pool

The cache items will be stored in memory and not persisted outside the running PHP process in any way. Might be useful for testing purposes.

use Tobento\Service\Cache\ArrayCacheItemPool;
use Tobento\Service\Clock\SystemClock;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Clock\ClockInterface;

$pool = new ArrayCacheItemPool(
    
    // The clock used for calculating expiration:
    clock: new SystemClock(), // ClockInterface
    
    // The default Time To Live in seconds, null forever:
    ttl: null, // null|int
);

var_dump($pool instanceof CacheItemPoolInterface);
// bool(true)

Psr16 Cache Item Pool

The Psr16 cache item pool using the defined Psr16 cache to store items.

use Tobento\Service\Cache\Psr16CacheItemPool;
use Tobento\Service\Cache\CanDeleteExpiredItems;
use Tobento\Service\Clock\SystemClock;
use Psr\SimpleCache\CacheInterface;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Clock\ClockInterface;

$pool = new Psr16CacheItemPool(
    
    cache: $cache, // CacheInterface
    
    // A namespace used as prefix for cache item keys:
    namespace: 'default', // string
    
    // The clock used for calculating expiration:
    clock: new SystemClock(), // ClockInterface
    
    // The default Time To Live in seconds, null forever:
    ttl: null, // null|int
);

var_dump($pool instanceof CacheItemPoolInterface);
// bool(true)

var_dump($pool instanceof CanDeleteExpiredItems);
// bool(true)

Cache Item Pools

Create Pools

use Tobento\Service\Cache\CacheItemPools;
use Tobento\Service\Cache\CacheItemPoolsInterface;

$pools = new CacheItemPools();

var_dump($pools instanceof CacheItemPoolsInterface);
// bool(true)

Add Pools

add

use Psr\Cache\CacheItemPoolInterface;

$pools->add(
    name: 'primary',
    pool: $pool, // CacheItemPoolInterface
);

register

You may use the register method to only create the pool if requested.

use Psr\Cache\CacheItemPoolInterface;

$pools->register(
    name: 'name',
    pool: function(string $name): CacheItemPoolInterface {
        // create the pool:
        return $pool;
    },
);

Get Pool

If the pool does not exist or could not get created it throws a CacheException::class.

use Psr\Cache\CacheItemPoolInterface;
use Psr\Cache\CacheException;

$pool = $pools->get(name: 'file');

var_dump($pool instanceof CacheItemPoolInterface);
// bool(true)

$pools->get(name: 'unknown');
// throws CacheException

You may use the has method to check if a pool exists.

var_dump($pools->has('name'));
// bool(false)

You may use the getNames method to get all pool names.

var_dump($pools->getNames());
// array(1) { [0]=> string(4) "file" }

Default Pools

You may add default pools for your application design.

use Tobento\Service\Cache\CacheItemPools;
use Tobento\Service\Cache\CacheItemPoolsInterface;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Cache\CacheException;

$pools = new CacheItemPools();

// add "file" pool:
$pools->add(name: 'file', pool: $pool);

// add default:
$pools->addDefault(name: 'primary', pool: 'file');

// get default pool for the specified name.
$primaryPool = $pools->default('primary');

var_dump($primaryPool instanceof CacheItemPoolInterface);
// bool(true)

var_dump($pools->hasDefault('primary'));
// bool(true)

var_dump($pools->getDefaults());
// { ["primary"]=> string(4) "file" }

$pools->default('unknown');
// throws CacheException

Interfaces

Cache Item Pool Factory Interface

You may use this interface for creating pools.

namespace Tobento\Service\Cache;

use Psr\Cache\CacheItemPoolInterface;
use Psr\Cache\CacheException;

interface CacheItemPoolFactoryInterface
{
    /**
     * Create a new CacheItemPool based on the configuration.
     *
     * @param string $name
     * @param array $config
     * @return CacheItemPoolInterface
     * @throws CacheException
     */
    public function createCacheItemPool(string $name, array $config = []): CacheItemPoolInterface;
}

Cache Item Pools Interface

namespace Tobento\Service\Cache;

use Psr\Cache\CacheItemPoolInterface;
use Psr\Cache\CacheException;

interface CacheItemPoolsInterface
{
    /**
     * Add a pool.
     *
     * @param string $name The pool name.
     * @param CacheItemPoolInterface $pool
     * @return static $this
     */
    public function add(string $name, CacheItemPoolInterface $pool): static;
    
    /**
     * Register a pool.
     *
     * @param string $name The pool name.
     * @param callable $pool
     * @return static $this
     */
    public function register(string $name, callable $pool): static;
    
    /**
     * Returns the pool by name.
     *
     * @param string $name The pool name
     * @return CacheItemPoolInterface
     * @throws CacheException
     */
    public function get(string $name): CacheItemPoolInterface;
    
    /**
     * Returns true if the pool exists, otherwise false.
     *
     * @param string $name The pool name.
     * @return bool
     */
    public function has(string $name): bool;

    /**
     * Adds a default name for the specified pool.
     *
     * @param string $name The default name.
     * @param string $pool The pool name.
     * @return static $this
     */
    public function addDefault(string $name, string $pool): static;

    /**
     * Returns the default pools.
     *
     * @return array<string, string> ['general' => 'files']
     */
    public function getDefaults(): array;
    
    /**
     * Returns the pool for the specified default name.
     *
     * @param string $name The type such as pdo.
     * @return CacheItemPoolInterface
     * @throws CacheException
     */
    public function default(string $name): CacheItemPoolInterface;
    
    /**
     * Returns true if the default pool exists, otherwise false.
     *
     * @param string $name The default name.
     * @return bool
     */
    public function hasDefault(string $name): bool;
    
    /**
     * Returns the names.
     *
     * @return array<int, string>
     */
    public function getNames(): array;
}

PSR 16 Simple Cache

Available Caches

Psr6 Cache

The Psr6 cache using the defined Psr6 pool to store items.

use Tobento\Service\Cache\Simple\Psr6Cache;
use Tobento\Service\Cache\ArrayCacheItemPool;
use Tobento\Service\Cache\CanDeleteExpiredItems;
use Tobento\Service\Clock\SystemClock;
use Psr\Cache\CacheItemPoolInterface;
use Psr\SimpleCache\CacheInterface;
use Psr\Clock\ClockInterface;

$pool = new ArrayCacheItemPool(
    clock: new SystemClock(),
);

$cache = new Psr6Cache(
    
    pool: $pool, // CacheItemPoolInterface
    
    // A namespace used as prefix for cache item keys:
    namespace: 'default', // string
    
    // The default Time To Live in seconds, null forever:
    ttl: null, // null|int
);

var_dump($cache instanceof CacheInterface);
// bool(true)

var_dump($cache instanceof CanDeleteExpiredItems);
// bool(true)

Check out the Can Delete Expired Items interface to learn more about it.

Caches

Create Caches

use Tobento\Service\Cache\Simple\Caches;
use Tobento\Service\Cache\Simple\CachesInterface;

$caches = new Caches();

var_dump($caches instanceof CachesInterface);
// bool(true)

Add Caches

add

use Psr\SimpleCache\CacheInterface;

$caches->add(
    name: 'primary',
    cache: $cache, // CacheInterface
);

register

You may use the register method to only create the cache if requested.

use Psr\SimpleCache\CacheInterface;

$caches->register(
    name: 'name',
    cache: function(string $name): CacheInterface {
        // create the cache:
        return $cache;
    },
);

Get Cache

If the cache does not exist or could not get created it throws a CacheException::class.

use Psr\SimpleCache\CacheInterface;
use Psr\SimpleCache\CacheException;

$cache = $caches->get(name: 'file');

var_dump($cache instanceof CacheInterface);
// bool(true)

$caches->get(name: 'unknown');
// throws CacheException

You may use the has method to check if a cache exists.

var_dump($caches->has('name'));
// bool(false)

You may use the getNames method to get all cache names.

var_dump($caches->getNames());
// array(1) { [0]=> string(4) "file" }

Default Caches

You may add default caches for your application design.

$caches = new Caches();

// add "file" cache:
$caches->add(name: 'file', cache: $cache);

// add default:
$caches->addDefault(name: 'primary', cache: 'file');

// get default cache for the specified name.
$primaryPool = $caches->default('primary');

var_dump($primaryPool instanceof CacheInterface);
// bool(true)

var_dump($caches->hasDefault('primary'));
// bool(true)

var_dump($caches->getDefaults());
// { ["primary"]=> string(4) "file" }

$caches->default('unknown');
// throws CacheException

Interfaces Simple

Cache Factory Interface

You may use this interface for creating caches.

namespace Tobento\Service\Cache\Simple;

use Psr\SimpleCache\CacheInterface;
use Psr\SimpleCache\CacheException;

interface CacheFactoryInterface
{
    /**
     * Create a new Cache based on the configuration.
     *
     * @param string $name
     * @param array $config
     * @return CacheInterface
     * @throws CacheException
     */
    public function createCache(string $name, array $config = []): CacheInterface;
}

Caches Interface

namespace Tobento\Service\Cache\Simple;

use Psr\SimpleCache\CacheInterface;
use Psr\SimpleCache\CacheException;

interface CachesInterface
{
    /**
     * Add a cache.
     *
     * @param string $name The cache name.
     * @param CacheInterface $cache
     * @return static $this
     */
    public function add(string $name, CacheInterface $cache): static;
    
    /**
     * Register a cache.
     *
     * @param string $name The cache name.
     * @param callable $cache
     * @return static $this
     */
    public function register(string $name, callable $cache): static;
    
    /**
     * Returns the cache by name.
     *
     * @param string $name The cache name
     * @return CacheInterface
     * @throws CacheException
     */
    public function get(string $name): CacheInterface;
    
    /**
     * Returns true if the cache exists, otherwise false.
     *
     * @param string $name The cache name.
     * @return bool
     */
    public function has(string $name): bool;

    /**
     * Adds a default name for the specified cache.
     *
     * @param string $name The default name.
     * @param string $cache The cache name.
     * @return static $this
     */
    public function addDefault(string $name, string $cache): static;

    /**
     * Returns the default caches.
     *
     * @return array<string, string> ['general' => 'files']
     */
    public function getDefaults(): array;
    
    /**
     * Returns the cache for the specified default name.
     *
     * @param string $name The type such as pdo.
     * @return CacheInterface
     * @throws CacheException
     */
    public function default(string $name): CacheInterface;
    
    /**
     * Returns true if the default cache exists, otherwise false.
     *
     * @param string $name The default name.
     * @return bool
     */
    public function hasDefault(string $name): bool;
    
    /**
     * Returns the names.
     *
     * @return array<int, string>
     */
    public function getNames(): array;
}

Shared Interfaces

Can Delete Expired Items

namespace Tobento\Service\Cache;

interface CanDeleteExpiredItems
{
    /**
     * Removes all expired items from the pool or cache.
     *
     * @return bool
     *   True if the items were successfully removed. False if there was an error.
     */
    public function deleteExpiredItems(): bool;
}

Credits

• Tobias Strub
• All Contributors