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76 lines
2.5 KiB
PHP
76 lines
2.5 KiB
PHP
<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\caching;
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/**
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* ChainedDependency represents a dependency which is composed of a list of other dependencies.
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*
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* When [[dependOnAll]] is true, if any of the dependencies has changed, this dependency is
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* considered changed; When [[dependOnAll]] is false, if one of the dependencies has NOT changed,
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* this dependency is considered NOT changed.
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*
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* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class ChainedDependency extends Dependency
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{
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/**
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* @var Dependency[] list of dependencies that this dependency is composed of.
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* Each array element must be a dependency object.
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*/
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public $dependencies = [];
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/**
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* @var bool whether this dependency is depending on every dependency in [[dependencies]].
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* Defaults to true, meaning if any of the dependencies has changed, this dependency is considered changed.
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* When it is set false, it means if one of the dependencies has NOT changed, this dependency
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* is considered NOT changed.
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*/
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public $dependOnAll = true;
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/**
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* Evaluates the dependency by generating and saving the data related with dependency.
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* @param CacheInterface $cache the cache component that is currently evaluating this dependency
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*/
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public function evaluateDependency($cache)
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{
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foreach ($this->dependencies as $dependency) {
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$dependency->evaluateDependency($cache);
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}
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}
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/**
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* Generates the data needed to determine if dependency has been changed.
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* This method does nothing in this class.
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* @param CacheInterface $cache the cache component that is currently evaluating this dependency
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* @return mixed the data needed to determine if dependency has been changed.
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*/
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protected function generateDependencyData($cache)
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{
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return null;
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}
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/**
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* @inheritdoc
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*/
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public function isChanged($cache)
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{
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foreach ($this->dependencies as $dependency) {
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if ($this->dependOnAll && $dependency->isChanged($cache)) {
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return true;
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} elseif (!$this->dependOnAll && !$dependency->isChanged($cache)) {
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return false;
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}
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}
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return !$this->dependOnAll;
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}
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}
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