/libs/Zend/Cache/Backend/TwoLevels.php
PHP | 536 lines | 248 code | 36 blank | 252 comment | 40 complexity | a0f3d47a82ca81aed51b7a29d86e7353 MD5 | raw file
- <?php
- /**
- * Zend Framework
- *
- * LICENSE
- *
- * This source file is subject to the new BSD license that is bundled
- * with this package in the file LICENSE.txt.
- * It is also available through the world-wide-web at this URL:
- * http://framework.zend.com/license/new-bsd
- * If you did not receive a copy of the license and are unable to
- * obtain it through the world-wide-web, please send an email
- * to license@zend.com so we can send you a copy immediately.
- *
- * @category Zend
- * @package Zend_Cache
- * @subpackage Zend_Cache_Backend
- * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: TwoLevels.php 24254 2011-07-22 12:04:41Z mabe $
- */
- /**
- * @see Zend_Cache_Backend_ExtendedInterface
- */
- // require_once 'Zend/Cache/Backend/ExtendedInterface.php';
- /**
- * @see Zend_Cache_Backend
- */
- // require_once 'Zend/Cache/Backend.php';
- /**
- * @package Zend_Cache
- * @subpackage Zend_Cache_Backend
- * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- */
- class Zend_Cache_Backend_TwoLevels extends Zend_Cache_Backend implements Zend_Cache_Backend_ExtendedInterface
- {
- /**
- * Available options
- *
- * =====> (string) slow_backend :
- * - Slow backend name
- * - Must implement the Zend_Cache_Backend_ExtendedInterface
- * - Should provide a big storage
- *
- * =====> (string) fast_backend :
- * - Flow backend name
- * - Must implement the Zend_Cache_Backend_ExtendedInterface
- * - Must be much faster than slow_backend
- *
- * =====> (array) slow_backend_options :
- * - Slow backend options (see corresponding backend)
- *
- * =====> (array) fast_backend_options :
- * - Fast backend options (see corresponding backend)
- *
- * =====> (int) stats_update_factor :
- * - Disable / Tune the computation of the fast backend filling percentage
- * - When saving a record into cache :
- * 1 => systematic computation of the fast backend filling percentage
- * x (integer) > 1 => computation of the fast backend filling percentage randomly 1 times on x cache write
- *
- * =====> (boolean) slow_backend_custom_naming :
- * =====> (boolean) fast_backend_custom_naming :
- * =====> (boolean) slow_backend_autoload :
- * =====> (boolean) fast_backend_autoload :
- * - See Zend_Cache::factory() method
- *
- * =====> (boolean) auto_refresh_fast_cache
- * - If true, auto refresh the fast cache when a cache record is hit
- *
- * @var array available options
- */
- protected $_options = array(
- 'slow_backend' => 'File',
- 'fast_backend' => 'Apc',
- 'slow_backend_options' => array(),
- 'fast_backend_options' => array(),
- 'stats_update_factor' => 10,
- 'slow_backend_custom_naming' => false,
- 'fast_backend_custom_naming' => false,
- 'slow_backend_autoload' => false,
- 'fast_backend_autoload' => false,
- 'auto_refresh_fast_cache' => true
- );
- /**
- * Slow Backend
- *
- * @var Zend_Cache_Backend_ExtendedInterface
- */
- protected $_slowBackend;
- /**
- * Fast Backend
- *
- * @var Zend_Cache_Backend_ExtendedInterface
- */
- protected $_fastBackend;
- /**
- * Cache for the fast backend filling percentage
- *
- * @var int
- */
- protected $_fastBackendFillingPercentage = null;
- /**
- * Constructor
- *
- * @param array $options Associative array of options
- * @throws Zend_Cache_Exception
- * @return void
- */
- public function __construct(array $options = array())
- {
- parent::__construct($options);
- if ($this->_options['slow_backend'] === null) {
- Zend_Cache::throwException('slow_backend option has to set');
- } elseif ($this->_options['slow_backend'] instanceof Zend_Cache_Backend_ExtendedInterface) {
- $this->_slowBackend = $this->_options['slow_backend'];
- } else {
- $this->_slowBackend = Zend_Cache::_makeBackend(
- $this->_options['slow_backend'],
- $this->_options['slow_backend_options'],
- $this->_options['slow_backend_custom_naming'],
- $this->_options['slow_backend_autoload']
- );
- if (!in_array('Zend_Cache_Backend_ExtendedInterface', class_implements($this->_slowBackend))) {
- Zend_Cache::throwException('slow_backend must implement the Zend_Cache_Backend_ExtendedInterface interface');
- }
- }
- if ($this->_options['fast_backend'] === null) {
- Zend_Cache::throwException('fast_backend option has to set');
- } elseif ($this->_options['fast_backend'] instanceof Zend_Cache_Backend_ExtendedInterface) {
- $this->_fastBackend = $this->_options['fast_backend'];
- } else {
- $this->_fastBackend = Zend_Cache::_makeBackend(
- $this->_options['fast_backend'],
- $this->_options['fast_backend_options'],
- $this->_options['fast_backend_custom_naming'],
- $this->_options['fast_backend_autoload']
- );
- if (!in_array('Zend_Cache_Backend_ExtendedInterface', class_implements($this->_fastBackend))) {
- Zend_Cache::throwException('fast_backend must implement the Zend_Cache_Backend_ExtendedInterface interface');
- }
- }
- $this->_slowBackend->setDirectives($this->_directives);
- $this->_fastBackend->setDirectives($this->_directives);
- }
- /**
- * Test if a cache is available or not (for the given id)
- *
- * @param string $id cache id
- * @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record
- */
- public function test($id)
- {
- $fastTest = $this->_fastBackend->test($id);
- if ($fastTest) {
- return $fastTest;
- } else {
- return $this->_slowBackend->test($id);
- }
- }
- /**
- * Save some string datas into a cache record
- *
- * Note : $data is always "string" (serialization is done by the
- * core not by the backend)
- *
- * @param string $data Datas to cache
- * @param string $id Cache id
- * @param array $tags Array of strings, the cache record will be tagged by each string entry
- * @param int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
- * @param int $priority integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
- * @return boolean true if no problem
- */
- public function save($data, $id, $tags = array(), $specificLifetime = false, $priority = 8)
- {
- $usage = $this->_getFastFillingPercentage('saving');
- $boolFast = true;
- $lifetime = $this->getLifetime($specificLifetime);
- $preparedData = $this->_prepareData($data, $lifetime, $priority);
- if (($priority > 0) && (10 * $priority >= $usage)) {
- $fastLifetime = $this->_getFastLifetime($lifetime, $priority);
- $boolFast = $this->_fastBackend->save($preparedData, $id, array(), $fastLifetime);
- $boolSlow = $this->_slowBackend->save($preparedData, $id, $tags, $lifetime);
- } else {
- $boolSlow = $this->_slowBackend->save($preparedData, $id, $tags, $lifetime);
- if ($boolSlow === true) {
- $boolFast = $this->_fastBackend->remove($id);
- if (!$boolFast && !$this->_fastBackend->test($id)) {
- // some backends return false on remove() even if the key never existed. (and it won't if fast is full)
- // all we care about is that the key doesn't exist now
- $boolFast = true;
- }
- }
- }
- return ($boolFast && $boolSlow);
- }
- /**
- * Test if a cache is available for the given id and (if yes) return it (false else)
- *
- * Note : return value is always "string" (unserialization is done by the core not by the backend)
- *
- * @param string $id Cache id
- * @param boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
- * @return string|false cached datas
- */
- public function load($id, $doNotTestCacheValidity = false)
- {
- $res = $this->_fastBackend->load($id, $doNotTestCacheValidity);
- if ($res === false) {
- $res = $this->_slowBackend->load($id, $doNotTestCacheValidity);
- if ($res === false) {
- // there is no cache at all for this id
- return false;
- }
- }
- $array = unserialize($res);
- // maybe, we have to refresh the fast cache ?
- if ($this->_options['auto_refresh_fast_cache']) {
- if ($array['priority'] == 10) {
- // no need to refresh the fast cache with priority = 10
- return $array['data'];
- }
- $newFastLifetime = $this->_getFastLifetime($array['lifetime'], $array['priority'], time() - $array['expire']);
- // we have the time to refresh the fast cache
- $usage = $this->_getFastFillingPercentage('loading');
- if (($array['priority'] > 0) && (10 * $array['priority'] >= $usage)) {
- // we can refresh the fast cache
- $preparedData = $this->_prepareData($array['data'], $array['lifetime'], $array['priority']);
- $this->_fastBackend->save($preparedData, $id, array(), $newFastLifetime);
- }
- }
- return $array['data'];
- }
- /**
- * Remove a cache record
- *
- * @param string $id Cache id
- * @return boolean True if no problem
- */
- public function remove($id)
- {
- $boolFast = $this->_fastBackend->remove($id);
- $boolSlow = $this->_slowBackend->remove($id);
- return $boolFast && $boolSlow;
- }
- /**
- * Clean some cache records
- *
- * Available modes are :
- * Zend_Cache::CLEANING_MODE_ALL (default) => remove all cache entries ($tags is not used)
- * Zend_Cache::CLEANING_MODE_OLD => remove too old cache entries ($tags is not used)
- * Zend_Cache::CLEANING_MODE_MATCHING_TAG => remove cache entries matching all given tags
- * ($tags can be an array of strings or a single string)
- * Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags}
- * ($tags can be an array of strings or a single string)
- * Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG => remove cache entries matching any given tags
- * ($tags can be an array of strings or a single string)
- *
- * @param string $mode Clean mode
- * @param array $tags Array of tags
- * @throws Zend_Cache_Exception
- * @return boolean true if no problem
- */
- public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
- {
- switch($mode) {
- case Zend_Cache::CLEANING_MODE_ALL:
- $boolFast = $this->_fastBackend->clean(Zend_Cache::CLEANING_MODE_ALL);
- $boolSlow = $this->_slowBackend->clean(Zend_Cache::CLEANING_MODE_ALL);
- return $boolFast && $boolSlow;
- break;
- case Zend_Cache::CLEANING_MODE_OLD:
- return $this->_slowBackend->clean(Zend_Cache::CLEANING_MODE_OLD);
- case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
- $ids = $this->_slowBackend->getIdsMatchingTags($tags);
- $res = true;
- foreach ($ids as $id) {
- $bool = $this->remove($id);
- $res = $res && $bool;
- }
- return $res;
- break;
- case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
- $ids = $this->_slowBackend->getIdsNotMatchingTags($tags);
- $res = true;
- foreach ($ids as $id) {
- $bool = $this->remove($id);
- $res = $res && $bool;
- }
- return $res;
- break;
- case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
- $ids = $this->_slowBackend->getIdsMatchingAnyTags($tags);
- $res = true;
- foreach ($ids as $id) {
- $bool = $this->remove($id);
- $res = $res && $bool;
- }
- return $res;
- break;
- default:
- Zend_Cache::throwException('Invalid mode for clean() method');
- break;
- }
- }
- /**
- * Return an array of stored cache ids
- *
- * @return array array of stored cache ids (string)
- */
- public function getIds()
- {
- return $this->_slowBackend->getIds();
- }
- /**
- * Return an array of stored tags
- *
- * @return array array of stored tags (string)
- */
- public function getTags()
- {
- return $this->_slowBackend->getTags();
- }
- /**
- * Return an array of stored cache ids which match given tags
- *
- * In case of multiple tags, a logical AND is made between tags
- *
- * @param array $tags array of tags
- * @return array array of matching cache ids (string)
- */
- public function getIdsMatchingTags($tags = array())
- {
- return $this->_slowBackend->getIdsMatchingTags($tags);
- }
- /**
- * Return an array of stored cache ids which don't match given tags
- *
- * In case of multiple tags, a logical OR is made between tags
- *
- * @param array $tags array of tags
- * @return array array of not matching cache ids (string)
- */
- public function getIdsNotMatchingTags($tags = array())
- {
- return $this->_slowBackend->getIdsNotMatchingTags($tags);
- }
- /**
- * Return an array of stored cache ids which match any given tags
- *
- * In case of multiple tags, a logical AND is made between tags
- *
- * @param array $tags array of tags
- * @return array array of any matching cache ids (string)
- */
- public function getIdsMatchingAnyTags($tags = array())
- {
- return $this->_slowBackend->getIdsMatchingAnyTags($tags);
- }
- /**
- * Return the filling percentage of the backend storage
- *
- * @return int integer between 0 and 100
- */
- public function getFillingPercentage()
- {
- return $this->_slowBackend->getFillingPercentage();
- }
- /**
- * Return an array of metadatas for the given cache id
- *
- * The array must include these keys :
- * - expire : the expire timestamp
- * - tags : a string array of tags
- * - mtime : timestamp of last modification time
- *
- * @param string $id cache id
- * @return array array of metadatas (false if the cache id is not found)
- */
- public function getMetadatas($id)
- {
- return $this->_slowBackend->getMetadatas($id);
- }
- /**
- * Give (if possible) an extra lifetime to the given cache id
- *
- * @param string $id cache id
- * @param int $extraLifetime
- * @return boolean true if ok
- */
- public function touch($id, $extraLifetime)
- {
- return $this->_slowBackend->touch($id, $extraLifetime);
- }
- /**
- * Return an associative array of capabilities (booleans) of the backend
- *
- * The array must include these keys :
- * - automatic_cleaning (is automating cleaning necessary)
- * - tags (are tags supported)
- * - expired_read (is it possible to read expired cache records
- * (for doNotTestCacheValidity option for example))
- * - priority does the backend deal with priority when saving
- * - infinite_lifetime (is infinite lifetime can work with this backend)
- * - get_list (is it possible to get the list of cache ids and the complete list of tags)
- *
- * @return array associative of with capabilities
- */
- public function getCapabilities()
- {
- $slowBackendCapabilities = $this->_slowBackend->getCapabilities();
- return array(
- 'automatic_cleaning' => $slowBackendCapabilities['automatic_cleaning'],
- 'tags' => $slowBackendCapabilities['tags'],
- 'expired_read' => $slowBackendCapabilities['expired_read'],
- 'priority' => $slowBackendCapabilities['priority'],
- 'infinite_lifetime' => $slowBackendCapabilities['infinite_lifetime'],
- 'get_list' => $slowBackendCapabilities['get_list']
- );
- }
- /**
- * Prepare a serialized array to store datas and metadatas informations
- *
- * @param string $data data to store
- * @param int $lifetime original lifetime
- * @param int $priority priority
- * @return string serialize array to store into cache
- */
- private function _prepareData($data, $lifetime, $priority)
- {
- $lt = $lifetime;
- if ($lt === null) {
- $lt = 9999999999;
- }
- return serialize(array(
- 'data' => $data,
- 'lifetime' => $lifetime,
- 'expire' => time() + $lt,
- 'priority' => $priority
- ));
- }
- /**
- * Compute and return the lifetime for the fast backend
- *
- * @param int $lifetime original lifetime
- * @param int $priority priority
- * @param int $maxLifetime maximum lifetime
- * @return int lifetime for the fast backend
- */
- private function _getFastLifetime($lifetime, $priority, $maxLifetime = null)
- {
- if ($lifetime <= 0) {
- // if no lifetime, we have an infinite lifetime
- // we need to use arbitrary lifetimes
- $fastLifetime = (int) (2592000 / (11 - $priority));
- } else {
- // prevent computed infinite lifetime (0) by ceil
- $fastLifetime = (int) ceil($lifetime / (11 - $priority));
- }
- if ($maxLifetime >= 0 && $fastLifetime > $maxLifetime) {
- return $maxLifetime;
- }
- return $fastLifetime;
- }
- /**
- * PUBLIC METHOD FOR UNIT TESTING ONLY !
- *
- * Force a cache record to expire
- *
- * @param string $id cache id
- */
- public function ___expire($id)
- {
- $this->_fastBackend->remove($id);
- $this->_slowBackend->___expire($id);
- }
- private function _getFastFillingPercentage($mode)
- {
- if ($mode == 'saving') {
- // mode saving
- if ($this->_fastBackendFillingPercentage === null) {
- $this->_fastBackendFillingPercentage = $this->_fastBackend->getFillingPercentage();
- } else {
- $rand = rand(1, $this->_options['stats_update_factor']);
- if ($rand == 1) {
- // we force a refresh
- $this->_fastBackendFillingPercentage = $this->_fastBackend->getFillingPercentage();
- }
- }
- } else {
- // mode loading
- // we compute the percentage only if it's not available in cache
- if ($this->_fastBackendFillingPercentage === null) {
- $this->_fastBackendFillingPercentage = $this->_fastBackend->getFillingPercentage();
- }
- }
- return $this->_fastBackendFillingPercentage;
- }
- }