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<?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 <[email protected]> |
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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 Cache $cache the cache component that is currently evaluating this dependency |
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*/ |
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public function evaluateDependency($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 Cache $cache the cache component that is currently evaluating this dependency |
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* @return mixed the data needed to determine if dependency has been changed. |
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*/ |
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protected function generateDependencyData($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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rob006 /
yii2-dev
