cache_data_source_versionable Interface Reference

Versionable cache data source. More...

Inheritance diagram for cache_data_source_versionable:

Public Member Functions
	load_for_cache ($key)
	Loads the data for the key provided ready formatted for caching.
	load_for_cache_versioned ($key, int $requiredversion, &$actualversion)
	Loads the data for the key provided ready formatted for caching.
	load_many_for_cache (array $keys)
	Loads several keys for the cache.

Static Public Member Functions
static	get_instance_for_cache (cache_definition $definition)
	Returns an instance of the data source class that the cache can use for loading data using the other methods specified by this interface.

Detailed Description

Versionable cache data source.

This interface extends the main cache data source interface to add an extra required method if the data source is to be used for a versioned cache.

Member Function Documentation

get_instance_for_cache()

static cache_data_source::get_instance_for_cache ( cache_definition $definition )

staticinherited

Returns an instance of the data source class that the cache can use for loading data using the other methods specified by this interface.

Parameters

cache_definition

$definition

Return values

object

Implemented in core_course\cache\course_image, mod_assign\cache\overrides, mod_lesson\cache\overrides, mod_quiz\cache\overrides, and question_finder.

load_for_cache()

cache_data_source::load_for_cache ( $key )

inherited

Loads the data for the key provided ready formatted for caching.

Parameters

string | int

$key

The key to load.

Return values

mixed

What ever data should be returned, or false if it can't be loaded.

Implemented in core_course\cache\course_image, core_message\time_last_message_between_users, mod_assign\cache\overrides, mod_lesson\cache\overrides, mod_quiz\cache\overrides, and question_finder.

load_for_cache_versioned()

cache_data_source_versionable::load_for_cache_versioned	(		$key,
		int	$requiredversion,
		&	$actualversion )

Loads the data for the key provided ready formatted for caching.

If there is no data for that key, or if the data for the required key has an older version than the specified $requiredversion, then this returns null.

If there is data then $actualversion should be set to the actual version number retrieved (may be the same as $requiredversion or newer).

Parameters

string | int	$key	The key to load.
int	$requiredversion	Minimum required version
mixed	$actualversion	Should be set to the actual version number retrieved

Return values

mixed

What ever data should be returned, or false if it can't be loaded.

load_many_for_cache()

cache_data_source::load_many_for_cache ( array $keys )

inherited

Loads several keys for the cache.

Parameters

array

$keys

An array of keys each of which will be string|int.

Return values

array

An array of matching data items.

Implemented in core_course\cache\course_image, core_message\time_last_message_between_users, mod_assign\cache\overrides, mod_lesson\cache\overrides, mod_quiz\cache\overrides, and question_finder.

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The documentation for this interface was generated from the following file:

• cache/classes/interfaces.php