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83 lines
2.8 KiB
83 lines
2.8 KiB
<?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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* ZendDataCache provides Zend data caching in terms of an application component. |
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* |
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* To use this application component, the [Zend Data Cache PHP extension](http://www.zend.com/en/products/server/) |
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* must be loaded. |
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* |
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* See [[Cache]] for common cache operations that ZendDataCache supports. |
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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 ZendDataCache extends Cache |
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{ |
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/** |
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* Retrieves a value from cache with a specified key. |
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* This is the implementation of the method declared in the parent class. |
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* @param string $key a unique key identifying the cached value |
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* @return string|boolean the value stored in cache, false if the value is not in the cache or expired. |
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*/ |
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protected function getValue($key) |
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{ |
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$result = zend_shm_cache_fetch($key); |
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return $result === null ? false : $result; |
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} |
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/** |
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* Stores a value identified by a key in cache. |
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* This is the implementation of the method declared in the parent class. |
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* |
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* @param string $key the key identifying the value to be cached |
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* @param string $value the value to be cached |
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. |
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* @return boolean true if the value is successfully stored into cache, false otherwise |
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*/ |
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protected function setValue($key, $value, $expire) |
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{ |
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return zend_shm_cache_store($key, $value, $expire); |
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} |
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/** |
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* Stores a value identified by a key into cache if the cache does not contain this key. |
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* This is the implementation of the method declared in the parent class. |
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* |
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* @param string $key the key identifying the value to be cached |
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* @param string $value the value to be cached |
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* @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire. |
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* @return boolean true if the value is successfully stored into cache, false otherwise |
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*/ |
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protected function addValue($key, $value, $expire) |
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{ |
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return zend_shm_cache_fetch($key) === null ? $this->setValue($key, $value, $expire) : false; |
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} |
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/** |
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* Deletes a value with the specified key from cache |
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* This is the implementation of the method declared in the parent class. |
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* @param string $key the key of the value to be deleted |
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* @return boolean if no error happens during deletion |
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*/ |
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protected function deleteValue($key) |
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{ |
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return zend_shm_cache_delete($key); |
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} |
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/** |
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* Deletes all values from cache. |
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* This is the implementation of the method declared in the parent class. |
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* @return boolean whether the flush operation was successful. |
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*/ |
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protected function flushValues() |
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{ |
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return zend_shm_cache_clear(); |
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} |
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}
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