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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\caching;
/**
* 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](guide:caching-overview).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class ChainedDependency extends Dependency
{
/**
* @var Dependency[] list of dependencies that this dependency is composed of.
* Each array element must be a dependency object.
*/
public $dependencies = [];
/**
* @var bool 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 $dependOnAll = true;
/**
* Evaluates the dependency by generating and saving the data related with dependency.
* @param Cache $cache the cache component that is currently evaluating this dependency
*/
public function evaluateDependency($cache)
{
foreach ($this->dependencies as $dependency) {
$dependency->evaluateDependency($cache);
}
}
/**
* Generates the data needed to determine if dependency has been changed.
* This method does nothing in this class.
* @param Cache $cache the cache component that is currently evaluating this dependency
* @return mixed the data needed to determine if dependency has been changed.
*/
protected function generateDependencyData($cache)
{
return null;
}
/**
* @inheritdoc
*/
public function isChanged($cache)
{
foreach ($this->dependencies as $dependency) {
if ($this->dependOnAll && $dependency->isChanged($cache)) {
return true;
} elseif (!$this->dependOnAll && !$dependency->isChanged($cache)) {
return false;
}
}
return !$this->dependOnAll;
}
}
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