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Commitb8da0dd

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feature#7265 [Cache] Memcached Adapter Docs and Cache Pool Docs Refactoring (robfrawley, javiereguiluz)
This PR was merged into the master branch.Discussion----------[Cache] Memcached Adapter Docs and Cache Pool Docs RefactoringDocumentation forsymfony/symfony#20863 andsymfony/symfony#20858. PRsymfony/symfony#20863 is still being written/finalized, so this is a WIP following that PR at this time.Resolves#7256.Commits-------7db929c corrected spelling/grammarc49d427 cleanup all cache adapter documentation, extend redis docse3eff5b Reviewed the entire articled4292b7 refactor cache pool documentation and add memcached adapter docs
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‎components/cache.rst‎

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single: Performance
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single: Components; Cache
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.. _`cache-component`:
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The Cache Component
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===================
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..index::
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single: Cache Pool
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single: APC Cache, APCu Cache
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.. _apcu-adapter:
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APCu Cache Adapter
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==================
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This adapter is a high-performance, shared memory cache. It can increase the
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application performance very significantly because the cache contents are
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stored in the shared memory of your server, a component that is much faster than
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others, such as the filesystem.
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..caution::
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**Requirement:** The `APCu extension`_ must be installed and active to use
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this adapter.
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This adapter can be provided an optional namespace string as its first parameter, a
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default cache lifetime as its second parameter, and a version string as its third
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parameter::
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use Symfony\Component\Cache\Adapter\ApcuAdapter;
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$cache = new ApcuAdapter(
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// a string prefixed to the keys of the items stored in this cache
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$namespace = '',
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// the default lifetime (in seconds) for cache items that do not define their
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// own lifetime, with a value 0 causing items to be stored indefinitely (i.e.
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// until the APCu memory is cleared)
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$defaultLifetime = 0,
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// when set, all keys prefixed by $namespace can be invalidated by changing
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// this $version string
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$version = null
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);
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..caution::
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It is *not* recommended to use this adapter when performing a large number of
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write and delete operations, as these operations result in fragmentation of the
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APCu memory, resulting in *significantly* degraded performance.
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..tip::
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Note that this adapter's CRUD operations are specific to the PHP SAPI it is running
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under. This means adding a cache item using the CLI will not result in the item
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appearing under FPM. Likewise, deletion of an item using CGI will not result in the
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item being deleted under the CLI.
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.. _`APCu extension`:https://pecl.php.net/package/APCu
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..index::
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single: Cache Pool
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single: Array Cache
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Array Cache Adapter
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===================
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Generally, this adapter is useful for testing purposes, as its contents are stored in memory
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and not persisted outside the running PHP process in any way. It can also be useful while
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warming up caches, due to the:method:`Symfony\\Component\\Cache\\Adapter\\ArrayAdapter::getValues`
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method.
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This adapter can be passed a default cache lifetime as its first parameter, and a boolean that
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toggles serialization as its second parameter::
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use Symfony\Component\Cache\Adapter\ArrayAdapter;
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$cache = new ArrayAdapter(
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// the default lifetime (in seconds) for cache items that do not define their
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// own lifetime, with a value 0 causing items to be stored indefinitely (i.e.
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// until the current PHP process finishes)
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$defaultLifetime = 0,
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// if ``true``, the values saved in the cache are serialized before storing them
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$storeSerialized = true
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);
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..index::
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single: Cache Pool
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single: Chain Cache
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Chain Cache Adapter
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===================
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This adapter allows to combine any number of the other available cache adapters.
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Cache items are fetched from the first adapter which contains them and cache items are
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saved in all the given adapters. This offers a simple way of creating a layered cache.
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This adapter expects an array of adapters as its first parameter, and optionally a
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maximum cache lifetime as its second parameter::
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use Symfony\Component\Cache\Adapter\ApcuAdapter;
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$cache = new ChainAdapter(array(
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// The ordered list of adapters used to fetch cached items
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array $adapters,
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// The max lifetime of items propagated from lower adapters to upper ones
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$maxLifetime = 0
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));
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..note::
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When an item is not found in the first adapter but is found in the next ones, this
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adapter ensures that the fetched item is saved in all the adapters where it was
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previously missing.
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The following example shows how to create a chain adapter instance using the fastest and
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slowest storage engines,:class:`Symfony\\Component\\Cache\\Adapter\\ApcuAdapter` and
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:class:`Symfony\\Component\\Cache\\Adapter\\FilesystemAdapter`, respectfully::
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use Symfony\Component\Cache\Adapter\ApcuAdapter;
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use Symfony\Component\Cache\Adapter\ChainAdapter;
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use Symfony\Component\Cache\Adapter\FilesystemAdapter;
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$cache = new ChainAdapter(array(
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new ApcuAdapter(),
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new FilesystemAdapter(),
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));
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..index::
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single: Cache Pool
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single: Doctrine Cache
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.. _`doctrine-adapter`:
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Doctrine Cache Adapter
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======================
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This adapter wraps any class extending the `Doctrine Cache`_ abstract provider, allowing
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you to use these providers in your application as if they were Symfony Cache adapters.
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This adapter expects a ``\Doctrine\Common\Cache\CacheProvider`` instance as its first
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parameter, and optionally a namespace and default cache lifetime as its second and
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third parameters::
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use Doctrine\Common\Cache\CacheProvider;
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use Doctrine\Common\Cache\SQLite3Cache;
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use Symfony\Component\Cache\Adapter\DoctrineAdapter;
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$provider = new SQLite3Cache(new \SQLite3(__DIR__.'/cache/data.sqlite'), 'youTableName');
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$symfonyCache = new DoctrineAdapter(
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// a cache provider instance
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CacheProvider $provider,
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// a string prefixed to the keys of the items stored in this cache
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$namespace = '',
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// the default lifetime (in seconds) for cache items that do not define their
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// own lifetime, with a value 0 causing items to be stored indefinitely (i.e.
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// until the database table is truncated or its rows are otherwise deleted)
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$defaultLifetime = 0
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);
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.. _`Doctrine Cache`:https://github.com/doctrine/cache
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..index::
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single: Cache Pool
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single: Filesystem Cache
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Filesystem Cache Adapter
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========================
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This adapter is useful when you want to improve the application performance but
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can't install tools like APCu or Redis on the server. This adapter stores the
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contents as regular files in a set of directories on the local file system.
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This adapter can optionally be provided a namespace, default cache lifetime, and
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directory path, as its first, second, and third parameters::
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use Symfony\Component\Cache\Adapter\FilesystemAdapter;
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$cache = new FilesystemAdapter(
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// a string used as the subdirectory of the root cache directory, where cache
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// items will be stored
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$namespace = '',
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// the default lifetime (in seconds) for cache items that do not define their
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// own lifetime, with a value 0 causing items to be stored indefinitely (i.e.
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// until the files are deleted)
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$defaultLifetime = 0,
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// the main cache directory (the application needs read-write permissions on it)
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// if none is specified, a directory is created inside the system temporary directory
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$directory = null
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);
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..tip::
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This adapter is generally the *slowest* due to the overhead of file IO. If throughput is paramount,
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the in-memory adapters (such as:ref:`APCu<apcu-adapter>`,:ref:`Memcached<memcached-adapter>`,
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and:ref:`Redis<redis-adapter>`) or the database adapters (such as
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:ref:`Doctrine<doctrine-adapter>` and:ref:`PDO & Doctrine<pdo-doctrine-adapter>`) are recommended.

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