# Class yii\caching\ChainedDependency

Inheritance | yii\caching\ChainedDependency » yii\caching\Dependency » yii\base\BaseObject
Implements | yii\base\Configurable
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/caching/ChainedDependency.php

ChainedDependency represents a dependency which is composed of a list of other dependencies.

When $dependOnAll is true, if any of the dependencies has changed, this dependency is considered changed; When $dependOnAll is false, if one of the dependencies has NOT changed, this dependency is considered NOT changed.

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

## Public Properties

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Property | Type | Description | Defined By
--- | --- | --- | ---
$data | mixed | The dependency data that is saved in cache and later is compared with the latest dependency data. | yii\caching\Dependency
$dependOnAll | boolean | Whether this dependency is depending on every dependency in $dependencies. | yii\caching\ChainedDependency
$dependencies | yii\caching\Dependency[] | List of dependencies that this dependency is composed of. | yii\caching\ChainedDependency
$reusable | boolean | Whether this dependency is reusable or not. | yii\caching\Dependency

## Public Methods

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Method | Description | Defined By
--- | --- | ---
__call() | Calls the named method which is not a class method. | yii\base\BaseObject
__construct() | Constructor. | yii\base\BaseObject
__get() | Returns the value of an object property. | yii\base\BaseObject
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\BaseObject
__set() | Sets value of an object property. | yii\base\BaseObject
__unset() | Sets an object property to null. | yii\base\BaseObject
canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\BaseObject
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\BaseObject
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
evaluateDependency() | Evaluates the dependency by generating and saving the data related with dependency. | yii\caching\ChainedDependency
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\BaseObject
hasProperty() | Returns a value indicating whether a property is defined. | yii\base\BaseObject
init() | Initializes the object. | yii\base\BaseObject
isChanged() | Checks whether the dependency is changed. | yii\caching\ChainedDependency
resetReusableData() | Resets all cached data for reusable dependencies. | yii\caching\Dependency

## Protected Methods

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Method | Description | Defined By
--- | --- | ---
generateDependencyData() | Generates the data needed to determine if dependency has been changed. | yii\caching\ChainedDependency
generateReusableHash() | Generates a unique hash that can be used for retrieving reusable dependency data. | yii\caching\Dependency

## Property Details

$dependOnAll public property

Whether this dependency is depending on every dependency in $dependencies. Defaults to true, meaning if any of the dependencies has changed, this dependency is considered changed. When it is set false, it means if one of the dependencies has NOT changed, this dependency is considered NOT changed.

public boolean $dependOnAll = true
$dependencies public property

List of dependencies that this dependency is composed of. Each array element must be a dependency object.

public yii\caching\Dependency[] $dependencies = []

## Method Details

evaluateDependency() public method

Evaluates the dependency by generating and saving the data related with dependency.

public void evaluateDependency ( $cache )
$cache | yii\caching\CacheInterface | The cache component that is currently evaluating this dependency

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.

isChanged() public method (available since version 2.0.11)

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.