TYPO3\CMS\Core\Cache\Backend\AbstractBackend Class Reference

Inheritance diagram for TYPO3\CMS\Core\Cache\Backend\AbstractBackend:

Public Member Functions
	__construct ($context, array $options=[])
	setCache (FrontendInterface $cache)
	setDefaultLifetime ($defaultLifetime)
	flushByTags (array $tags)
‪Public Member Functions inherited from ‪TYPO3\CMS\Core\Cache\Backend\BackendInterface
	set ($entryIdentifier, $data, array $tags=[], $lifetime=null)
mixed	get ($entryIdentifier)
bool	has ($entryIdentifier)
bool	remove ($entryIdentifier)
	flush ()
	collectGarbage ()

Public Attributes
const	DATETIME_EXPIRYTIME_UNLIMITED = '9999-12-31T23:59:59+0000'
const	UNLIMITED_LIFETIME = 0

Protected Member Functions
DateTime	calculateExpiryTime ($lifetime=null)

Protected Attributes
TYPO3 CMS Core Cache Frontend FrontendInterface	$cache
string	$cacheIdentifier
string	$context
int	$defaultLifetime = 3600

Detailed Description

An abstract caching backend

Definition at line 27 of file AbstractBackend.php.

Constructor & Destructor Documentation

__construct()

TYPO3\CMS\Core\Cache\Backend\AbstractBackend::__construct	(		$context,
		array	$options = []
	)

Constructs this backend

Parameters

string	$context	‪Unused, for backward compatibility only
array	$options	‪Configuration options - depends on the actual backend

Exceptions

Reimplemented in TYPO3\CMS\Core\Cache\Backend\RedisBackend, TYPO3\CMS\Core\Cache\Backend\MemcachedBackend, TYPO3\CMS\Core\Cache\Backend\ApcuBackend, and TYPO3\CMS\Core\Cache\Backend\WincacheBackend.

Definition at line 65 of file AbstractBackend.php.

References TYPO3\CMS\Core\Cache\Backend\AbstractBackend\$context.

Member Function Documentation

calculateExpiryTime()

DateTime TYPO3\CMS\Core\Cache\Backend\AbstractBackend::calculateExpiryTime (   $lifetime = null )

protected

Calculates the expiry time by the given lifetime. If no lifetime is specified, the default lifetime is used.

Parameters

int

$lifetime

‪The lifetime in seconds

Returns

‪\DateTime The expiry time

Definition at line 133 of file AbstractBackend.php.

References TYPO3\CMS\Core\Cache\Backend\AbstractBackend\$defaultLifetime.

flushByTags()

TYPO3\CMS\Core\Cache\Backend\AbstractBackend::flushByTags

(

array

$tags

)

Backwards compatibility safeguard since re-introducing flushByTags as API. See https://review.typo3.org/#/c/50537/ comments for patch set 14.

The method is here even though it is only required for TaggableBackendInterface. We add it here to ensure third party cache backends do not fail but instead delegate to a less efficient linear flushing behavior.

Parameters

string[]

$tags

Reimplemented in TYPO3\CMS\Core\Cache\Backend\Typo3DatabaseBackend.

Definition at line 119 of file AbstractBackend.php.

setCache()

TYPO3\CMS\Core\Cache\Backend\AbstractBackend::setCache

(

FrontendInterface

$cache

)

Sets a reference to the cache frontend which uses this backend

Parameters

\TYPO3\CMS\Core\Cache\Frontend\FrontendInterface

$cache

‪The frontend for this backend

Implements TYPO3\CMS\Core\Cache\Backend\BackendInterface.

Reimplemented in TYPO3\CMS\Core\Cache\Backend\MemcachedBackend, TYPO3\CMS\Core\Cache\Backend\FileBackend, TYPO3\CMS\Core\Cache\Backend\ApcuBackend, TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend, and TYPO3\CMS\Core\Cache\Backend\Typo3DatabaseBackend.

Definition at line 89 of file AbstractBackend.php.

References TYPO3\CMS\Core\Cache\Backend\AbstractBackend\$cache, and TYPO3\CMS\Core\Cache\Frontend\FrontendInterface\getIdentifier().

Referenced by TYPO3\CMS\Core\Cache\Frontend\AbstractFrontend\__construct().

setDefaultLifetime()

TYPO3\CMS\Core\Cache\Backend\AbstractBackend::setDefaultLifetime

(

$defaultLifetime

)

Sets the default lifetime for this cache backend

Parameters

int

$defaultLifetime

‪Default lifetime of this cache backend in seconds. If NULL is specified, the default lifetime is used. "0" means unlimited lifetime.

Exceptions

Definition at line 101 of file AbstractBackend.php.

References TYPO3\CMS\Core\Cache\Backend\AbstractBackend\$defaultLifetime.

Member Data Documentation

$cache

TYPO3 CMS Core Cache Frontend FrontendInterface TYPO3\CMS\Core\Cache\Backend\AbstractBackend::$cache

protected

Reference to the cache which uses this backend

Definition at line 37 of file AbstractBackend.php.

Referenced by TYPO3\CMS\Core\Cache\Backend\Typo3DatabaseBackend\setCache(), TYPO3\CMS\Core\Cache\Backend\SimpleFileBackend\setCache(), TYPO3\CMS\Core\Cache\Backend\AbstractBackend\setCache(), TYPO3\CMS\Core\Cache\Backend\ApcuBackend\setCache(), TYPO3\CMS\Core\Cache\Backend\FileBackend\setCache(), and TYPO3\CMS\Core\Cache\Backend\MemcachedBackend\setCache().

$cacheIdentifier

string TYPO3\CMS\Core\Cache\Backend\AbstractBackend::$cacheIdentifier

protected

Definition at line 41 of file AbstractBackend.php.

Referenced by TYPO3\CMS\Core\Cache\Backend\ApcuBackend\set(), TYPO3\CMS\Core\Cache\Backend\MemcachedBackend\set(), and TYPO3\CMS\Core\Cache\Backend\Typo3DatabaseBackend\setCache().

$context

string TYPO3\CMS\Core\Cache\Backend\AbstractBackend::$context

protected

The current application context

This variable is currently unused and set to "production" always. It is only kept to keep backwards compatibility.

Definition at line 50 of file AbstractBackend.php.

Referenced by TYPO3\CMS\Core\Cache\Backend\WincacheBackend\__construct(), TYPO3\CMS\Core\Cache\Backend\AbstractBackend\__construct(), TYPO3\CMS\Core\Cache\Backend\ApcuBackend\__construct(), TYPO3\CMS\Core\Cache\Backend\MemcachedBackend\__construct(), and TYPO3\CMS\Core\Cache\Backend\RedisBackend\__construct().

$defaultLifetime

int TYPO3\CMS\Core\Cache\Backend\AbstractBackend::$defaultLifetime = 3600

protected

Default lifetime of a cache entry in seconds

Definition at line 56 of file AbstractBackend.php.

Referenced by TYPO3\CMS\Core\Cache\Backend\AbstractBackend\calculateExpiryTime(), TYPO3\CMS\Core\Cache\Backend\WincacheBackend\set(), TYPO3\CMS\Core\Cache\Backend\Typo3DatabaseBackend\set(), TYPO3\CMS\Core\Cache\Backend\PdoBackend\set(), TYPO3\CMS\Core\Cache\Backend\ApcuBackend\set(), TYPO3\CMS\Core\Cache\Backend\MemcachedBackend\set(), TYPO3\CMS\Core\Cache\Backend\RedisBackend\set(), and TYPO3\CMS\Core\Cache\Backend\AbstractBackend\setDefaultLifetime().

DATETIME_EXPIRYTIME_UNLIMITED

const TYPO3\CMS\Core\Cache\Backend\AbstractBackend::DATETIME_EXPIRYTIME_UNLIMITED = '9999-12-31T23:59:59+0000'

Definition at line 31 of file AbstractBackend.php.

UNLIMITED_LIFETIME

const TYPO3\CMS\Core\Cache\Backend\AbstractBackend::UNLIMITED_LIFETIME = 0

Definition at line 32 of file AbstractBackend.php.