Class yii\caching\TagDependency

Inheritanceyii\caching\TagDependency » yii\caching\Dependency » yii\base\Object
Implementsyii\base\Configurable
Available since version2.0
Source Code https://github.com/yiisoft/yii2/blob/master/framework/caching/TagDependency.php

TagDependency associates a cached data item with one or multiple $tags.

By calling invalidate(), you can invalidate all cached data items that are associated with the specified tag name(s).

// setting multiple cache keys to store data forever and tagging them with "user-123"
Yii::$app->cache->set('user_42_profile', '', 0, new TagDependency(['tags' => 'user-123']));
Yii::$app->cache->set('user_42_stats', '', 0, new TagDependency(['tags' => 'user-123']));

// invalidating all keys tagged with "user-123"
TagDependency::invalidate(Yii::$app->cache, 'user-123');

For more details and usage information on Cache, see the guide article on caching.

Public Properties

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PropertyTypeDescriptionDefined By
$data mixed The dependency data that is saved in cache and later is compared with the latest dependency data. yii\caching\Dependency
$reusable boolean Whether this dependency is reusable or not. yii\caching\Dependency
$tags string|array A list of tag names for this dependency. yii\caching\TagDependency

Public Methods

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MethodDescriptionDefined By
__call() Calls the named method which is not a class method. yii\base\Object
__construct() Constructor. yii\base\Object
__get() Returns the value of an object property. yii\base\Object
__isset() Checks if a property is set, i.e. defined and not null. yii\base\Object
__set() Sets value of an object property. yii\base\Object
__unset() Sets an object property to null. yii\base\Object
canGetProperty() Returns a value indicating whether a property can be read. yii\base\Object
canSetProperty() Returns a value indicating whether a property can be set. yii\base\Object
className() Returns the fully qualified name of this class. yii\base\Object
evaluateDependency() Evaluates the dependency by generating and saving the data related with dependency. yii\caching\Dependency
getHasChanged() Returns a value indicating whether the dependency has changed. yii\caching\Dependency
hasMethod() Returns a value indicating whether a method is defined. yii\base\Object
hasProperty() Returns a value indicating whether a property is defined. yii\base\Object
init() Initializes the object. yii\base\Object
invalidate() Invalidates all of the cached data items that are associated with any of the specified $tags. yii\caching\TagDependency
isChanged() Checks whether the dependency is changed yii\caching\TagDependency
resetReusableData() Resets all cached data for reusable dependencies. yii\caching\Dependency

Protected Methods

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MethodDescriptionDefined By
generateDependencyData() Generates the data needed to determine if dependency has been changed. yii\caching\TagDependency
generateReusableHash() Generates a unique hash that can be used for retrieving reusable dependency data. yii\caching\Dependency
getTimestamps() Returns the timestamps for the specified tags. yii\caching\TagDependency
touchKeys() Generates the timestamp for the specified cache keys. yii\caching\TagDependency

Property Details

$tags public property

A list of tag names for this dependency. For a single tag, you may specify it as a string.

public string|array $tags = []

Method Details

generateDependencyData() protected method

Generates the data needed to determine if dependency has been changed.

This method does nothing in this class.

protected mixed generateDependencyData ( $cache )
$cache yii\caching\CacheInterface

The cache component that is currently evaluating this dependency

return mixed

The data needed to determine if dependency has been changed.

getTimestamps() protected method

Returns the timestamps for the specified tags.

protected array getTimestamps ( $cache, $tags )
$cache yii\caching\CacheInterface
$tags string[]
return array

The timestamps indexed by the specified tags.

invalidate() public static method

Invalidates all of the cached data items that are associated with any of the specified $tags.

public static void invalidate ( $cache, $tags )
$cache yii\caching\CacheInterface

The cache component that caches the data items

$tags string|array
isChanged() public method

Checks whether the dependency is changed

public boolean isChanged ( $cache )
$cache yii\caching\CacheInterface

The cache component that is currently evaluating this dependency

return boolean

Whether the dependency has changed.

touchKeys() protected static method

Generates the timestamp for the specified cache keys.

protected static array touchKeys ( $cache, $keys )
$cache yii\caching\CacheInterface
$keys string[]
return array

The timestamp indexed by cache keys