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55 lines
1.6 KiB
PHP
55 lines
1.6 KiB
PHP
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<?php
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/**
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* CGlobalStateCacheDependency class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright 2008-2013 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CGlobalStateCacheDependency represents a dependency based on a global state value.
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*
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* CGlobalStateCacheDependency checks if a global state is changed or not.
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* If the global state is changed, the dependency is reported as changed.
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* To specify which global state this dependency should check with,
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* set {@link stateName} to the name of the global state.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @package system.caching.dependencies
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* @since 1.0
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*/
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class CGlobalStateCacheDependency extends CCacheDependency
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{
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/**
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* @var string the name of the global state whose value is to check
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* if the dependency has changed.
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* @see CApplication::setGlobalState
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*/
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public $stateName;
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/**
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* Constructor.
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* @param string $name the name of the global state
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*/
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public function __construct($name=null)
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{
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$this->stateName=$name;
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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 returns the value of the global state.
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* @throws CException if {@link stateName} is empty
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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 generateDependentData()
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{
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if($this->stateName!==null)
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return Yii::app()->getGlobalState($this->stateName);
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else
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throw new CException(Yii::t('yii','CGlobalStateCacheDependency.stateName cannot be empty.'));
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}
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}
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