164 lines
6.4 KiB
PHP
164 lines
6.4 KiB
PHP
<?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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use yii\base\InvalidConfigException;
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/**
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* ApcCache provides APC caching in terms of an application component.
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*
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* To use this application component, the [APC PHP extension](https://secure.php.net/apc) must be loaded.
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* Alternatively [APCu PHP extension](https://secure.php.net/apcu) could be used via setting `useApcu` to `true`.
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* In order to enable APC or APCu for CLI you should add "apc.enable_cli = 1" to your php.ini.
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*
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* See [[Cache]] for common cache operations that ApcCache supports.
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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 <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class ApcCache extends Cache
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{
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/**
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* @var bool whether to use apcu or apc as the underlying caching extension.
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* If true, [apcu](https://pecl.php.net/package/apcu) will be used.
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* If false, [apc](https://pecl.php.net/package/apc) will be used.
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* Defaults to false.
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* @since 2.0.7
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*/
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public $useApcu = false;
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/**
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* Initializes this application component.
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* It checks if extension required is loaded.
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*/
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public function init()
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{
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parent::init();
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$extension = $this->useApcu ? 'apcu' : 'apc';
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if (!extension_loaded($extension)) {
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throw new InvalidConfigException("ApcCache requires PHP $extension extension to be loaded.");
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}
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}
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/**
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* Checks whether a specified key exists in the cache.
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* This can be faster than getting the value from the cache if the data is big.
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* Note that this method does not check whether the dependency associated
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* with the cached data, if there is any, has changed. So a call to [[get]]
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* may return false while exists returns true.
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* @param mixed $key a key identifying the cached value. This can be a simple string or
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* a complex data structure consisting of factors representing the key.
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* @return bool true if a value exists in cache, false if the value is not in the cache or expired.
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*/
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public function exists($key)
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{
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$key = $this->buildKey($key);
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return $this->useApcu ? apcu_exists($key) : apc_exists($key);
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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 $key a unique key identifying the cached value
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* @return mixed|false the value stored in cache, false if the value is not in the cache or expired.
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*/
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protected function getValue($key)
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{
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return $this->useApcu ? apcu_fetch($key) : apc_fetch($key);
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}
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/**
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* Retrieves multiple values from cache with the specified keys.
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* @param array $keys a list of keys identifying the cached values
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* @return array a list of cached values indexed by the keys
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*/
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protected function getValues($keys)
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{
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$values = $this->useApcu ? apcu_fetch($keys) : apc_fetch($keys);
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return is_array($values) ? $values : [];
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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 mixed $value the value to be cached. Most often it's a string. If you have disabled [[serializer]],
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* it could be something else.
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* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @return bool true if the value is successfully stored into cache, false otherwise.
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*/
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protected function setValue($key, $value, $duration)
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{
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return $this->useApcu ? apcu_store($key, $value, $duration) : apc_store($key, $value, $duration);
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}
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/**
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* Stores multiple key-value pairs in cache.
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* @param array $data array where key corresponds to cache key while value
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* @param int $duration the number of seconds in which the cached values will expire. 0 means never expire.
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* @return array array of failed keys
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*/
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protected function setValues($data, $duration)
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{
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$result = $this->useApcu ? apcu_store($data, null, $duration) : apc_store($data, null, $duration);
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return is_array($result) ? array_keys($result) : [];
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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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* @param string $key the key identifying the value to be cached
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* @param mixed $value the value to be cached. Most often it's a string. If you have disabled [[serializer]],
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* it could be something else.
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* @param int $duration the number of seconds in which the cached value will expire. 0 means never expire.
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* @return bool true if the value is successfully stored into cache, false otherwise
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*/
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protected function addValue($key, $value, $duration)
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{
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return $this->useApcu ? apcu_add($key, $value, $duration) : apc_add($key, $value, $duration);
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}
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/**
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* Adds multiple key-value pairs to cache.
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* @param array $data array where key corresponds to cache key while value is the value stored
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* @param int $duration the number of seconds in which the cached values will expire. 0 means never expire.
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* @return array array of failed keys
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*/
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protected function addValues($data, $duration)
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{
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$result = $this->useApcu ? apcu_add($data, null, $duration) : apc_add($data, null, $duration);
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return is_array($result) ? array_keys($result) : [];
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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 $key the key of the value to be deleted
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* @return bool if no error happens during deletion
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*/
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protected function deleteValue($key)
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{
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return $this->useApcu ? apcu_delete($key) : apc_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 bool 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 $this->useApcu ? apcu_clear_cache() : apc_clear_cache('user');
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}
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}
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