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54 lines
1.4 KiB
54 lines
1.4 KiB
<?php |
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/** |
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* Dependency class file. |
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* |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright © 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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* Dependency is the base class for cache dependency classes. |
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* |
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* Child classes should override its [[generateDependencyData()]] for generating |
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* the actual dependency data. |
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* |
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* @property boolean $hasChanged Whether the dependency has changed. |
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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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abstract class Dependency extends \yii\base\Object |
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{ |
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/** |
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* @var mixed the dependency data that is saved in cache and later is compared with the |
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* latest dependency data. |
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*/ |
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public $data; |
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/** |
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* Evaluates the dependency by generating and saving the data related with dependency. |
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* This method is invoked by cache before writing data into it. |
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*/ |
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public function evaluateDependency() |
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{ |
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$this->data = $this->generateDependencyData(); |
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} |
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/** |
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* @return boolean whether the dependency has changed. |
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*/ |
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public function getHasChanged() |
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{ |
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return $this->generateDependencyData() !== $this->data; |
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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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* Derived classes should override this method to generate the actual dependency data. |
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* @return mixed the data needed to determine if dependency has been changed. |
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*/ |
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abstract protected function generateDependencyData(); |
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} |