546 lines
17 KiB
PHP
Executable File
546 lines
17 KiB
PHP
Executable File
<?php
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/**
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Cache
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* @since CakePHP(tm) v 1.2.0.4933
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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App::uses('Inflector', 'Utility');
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App::uses('CacheEngine', 'Cache');
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/**
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* Cache provides a consistent interface to Caching in your application. It allows you
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* to use several different Cache engines, without coupling your application to a specific
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* implementation. It also allows you to change out cache storage or configuration without effecting
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* the rest of your application.
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*
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* You can configure Cache engines in your application's `bootstrap.php` file. A sample configuration would
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* be
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*
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* {{{
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* Cache::config('shared', array(
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* 'engine' => 'Apc',
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* 'prefix' => 'my_app_'
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* ));
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* }}}
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*
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* This would configure an APC cache engine to the 'shared' alias. You could then read and write
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* to that cache alias by using it for the `$config` parameter in the various Cache methods. In
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* general all Cache operations are supported by all cache engines. However, Cache::increment() and
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* Cache::decrement() are not supported by File caching.
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*
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* @package Cake.Cache
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*/
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class Cache {
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/**
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* Cache configuration stack
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* Keeps the permanent/default settings for each cache engine.
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* These settings are used to reset the engines after temporary modification.
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*
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* @var array
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*/
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protected static $_config = array();
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/**
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* Group to Config mapping
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*
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* @var array
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*/
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protected static $_groups = array();
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/**
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* Whether to reset the settings with the next call to Cache::set();
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*
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* @var array
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*/
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protected static $_reset = false;
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/**
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* Engine instances keyed by configuration name.
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*
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* @var array
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*/
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protected static $_engines = array();
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/**
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* Set the cache configuration to use. config() can
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* both create new configurations, return the settings for already configured
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* configurations.
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*
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* To create a new configuration, or to modify an existing configuration permanently:
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*
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* `Cache::config('my_config', array('engine' => 'File', 'path' => TMP));`
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*
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* If you need to modify a configuration temporarily, use Cache::set().
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* To get the settings for a configuration:
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*
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* `Cache::config('default');`
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*
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* There are 5 built-in caching engines:
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*
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* - `FileEngine` - Uses simple files to store content. Poor performance, but good for
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* storing large objects, or things that are not IO sensitive.
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* - `ApcEngine` - Uses the APC object cache, one of the fastest caching engines.
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* - `MemcacheEngine` - Uses the PECL::Memcache extension and Memcached for storage.
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* Fast reads/writes, and benefits from memcache being distributed.
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* - `XcacheEngine` - Uses the Xcache extension, an alternative to APC.
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* - `WincacheEngine` - Uses Windows Cache Extension for PHP. Supports wincache 1.1.0 and higher.
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*
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* The following keys are used in core cache engines:
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*
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* - `duration` Specify how long items in this cache configuration last.
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* - `groups` List of groups or 'tags' associated to every key stored in this config.
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* handy for deleting a complete group from cache.
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* - `prefix` Prefix appended to all entries. Good for when you need to share a keyspace
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* with either another cache config or another application.
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* - `probability` Probability of hitting a cache gc cleanup. Setting to 0 will disable
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* cache::gc from ever being called automatically.
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* - `servers' Used by memcache. Give the address of the memcached servers to use.
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* - `compress` Used by memcache. Enables memcache's compressed format.
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* - `serialize` Used by FileCache. Should cache objects be serialized first.
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* - `path` Used by FileCache. Path to where cachefiles should be saved.
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* - `lock` Used by FileCache. Should files be locked before writing to them?
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* - `user` Used by Xcache. Username for XCache
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* - `password` Used by Xcache/Redis. Password for XCache/Redis
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*
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* @see app/Config/core.php for configuration settings
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* @param string $name Name of the configuration
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* @param array $settings Optional associative array of settings passed to the engine
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* @return array array(engine, settings) on success, false on failure
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* @throws CacheException
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*/
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public static function config($name = null, $settings = array()) {
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if (is_array($name)) {
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$settings = $name;
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}
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$current = array();
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if (isset(self::$_config[$name])) {
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$current = self::$_config[$name];
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}
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if (!empty($settings)) {
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self::$_config[$name] = array_merge($current, $settings);
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}
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if (empty(self::$_config[$name]['engine'])) {
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return false;
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}
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if (!empty(self::$_config[$name]['groups'])) {
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foreach (self::$_config[$name]['groups'] as $group) {
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self::$_groups[$group][] = $name;
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sort(self::$_groups[$group]);
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self::$_groups[$group] = array_unique(self::$_groups[$group]);
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}
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}
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$engine = self::$_config[$name]['engine'];
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if (!isset(self::$_engines[$name])) {
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self::_buildEngine($name);
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$settings = self::$_config[$name] = self::settings($name);
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} elseif ($settings = self::set(self::$_config[$name], null, $name)) {
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self::$_config[$name] = $settings;
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}
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return compact('engine', 'settings');
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}
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/**
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* Finds and builds the instance of the required engine class.
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*
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* @param string $name Name of the config array that needs an engine instance built
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* @return boolean
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* @throws CacheException
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*/
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protected static function _buildEngine($name) {
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$config = self::$_config[$name];
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list($plugin, $class) = pluginSplit($config['engine'], true);
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$cacheClass = $class . 'Engine';
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App::uses($cacheClass, $plugin . 'Cache/Engine');
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if (!class_exists($cacheClass)) {
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throw new CacheException(__d('cake_dev', 'Cache engine %s is not available.', $name));
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}
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$cacheClass = $class . 'Engine';
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if (!is_subclass_of($cacheClass, 'CacheEngine')) {
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throw new CacheException(__d('cake_dev', 'Cache engines must use %s as a base class.', 'CacheEngine'));
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}
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self::$_engines[$name] = new $cacheClass();
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if (!self::$_engines[$name]->init($config)) {
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throw new CacheException(__d('cake_dev', 'Cache engine %s is not properly configured.', $name));
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}
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if (self::$_engines[$name]->settings['probability'] && time() % self::$_engines[$name]->settings['probability'] === 0) {
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self::$_engines[$name]->gc();
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}
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return true;
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}
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/**
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* Returns an array containing the currently configured Cache settings.
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*
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* @return array Array of configured Cache config names.
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*/
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public static function configured() {
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return array_keys(self::$_config);
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}
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/**
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* Drops a cache engine. Deletes the cache configuration information
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* If the deleted configuration is the last configuration using an certain engine,
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* the Engine instance is also unset.
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*
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* @param string $name A currently configured cache config you wish to remove.
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* @return boolean success of the removal, returns false when the config does not exist.
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*/
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public static function drop($name) {
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if (!isset(self::$_config[$name])) {
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return false;
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}
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unset(self::$_config[$name], self::$_engines[$name]);
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return true;
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}
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/**
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* Temporarily change the settings on a cache config. The settings will persist for the next write
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* operation (write, decrement, increment, clear). Any reads that are done before the write, will
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* use the modified settings. If `$settings` is empty, the settings will be reset to the
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* original configuration.
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*
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* Can be called with 2 or 3 parameters. To set multiple values at once.
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*
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* `Cache::set(array('duration' => '+30 minutes'), 'my_config');`
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*
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* Or to set one value.
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*
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* `Cache::set('duration', '+30 minutes', 'my_config');`
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*
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* To reset a config back to the originally configured values.
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*
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* `Cache::set(null, 'my_config');`
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*
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* @param string|array $settings Optional string for simple name-value pair or array
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* @param string $value Optional for a simple name-value pair
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* @param string $config The configuration name you are changing. Defaults to 'default'
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* @return array Array of settings.
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*/
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public static function set($settings = array(), $value = null, $config = 'default') {
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if (is_array($settings) && $value !== null) {
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$config = $value;
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}
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if (!isset(self::$_config[$config]) || !isset(self::$_engines[$config])) {
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return false;
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}
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if (!empty($settings)) {
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self::$_reset = true;
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}
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if (self::$_reset === true) {
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if (empty($settings)) {
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self::$_reset = false;
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$settings = self::$_config[$config];
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} else {
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if (is_string($settings) && $value !== null) {
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$settings = array($settings => $value);
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}
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$settings = array_merge(self::$_config[$config], $settings);
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if (isset($settings['duration']) && !is_numeric($settings['duration'])) {
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$settings['duration'] = strtotime($settings['duration']) - time();
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}
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}
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self::$_engines[$config]->settings = $settings;
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}
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return self::settings($config);
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}
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/**
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* Garbage collection
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*
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* Permanently remove all expired and deleted data
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*
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* @param string $config [optional] The config name you wish to have garbage collected. Defaults to 'default'
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* @param integer $expires [optional] An expires timestamp. Defaults to NULL
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* @return void
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*/
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public static function gc($config = 'default', $expires = null) {
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self::$_engines[$config]->gc($expires);
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}
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/**
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* Write data for key into cache. Will automatically use the currently
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* active cache configuration. To set the currently active configuration use
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* Cache::config()
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*
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* ### Usage:
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*
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* Writing to the active cache config:
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*
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* `Cache::write('cached_data', $data);`
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*
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* Writing to a specific cache config:
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*
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* `Cache::write('cached_data', $data, 'long_term');`
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*
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* @param string $key Identifier for the data
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* @param mixed $value Data to be cached - anything except a resource
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* @param string $config Optional string configuration name to write to. Defaults to 'default'
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* @return boolean True if the data was successfully cached, false on failure
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*/
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public static function write($key, $value, $config = 'default') {
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$settings = self::settings($config);
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if (empty($settings)) {
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return false;
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}
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if (!self::isInitialized($config)) {
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return false;
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}
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$key = self::$_engines[$config]->key($key);
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if (!$key || is_resource($value)) {
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return false;
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}
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$success = self::$_engines[$config]->write($settings['prefix'] . $key, $value, $settings['duration']);
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self::set(null, $config);
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if ($success === false && $value !== '') {
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trigger_error(
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__d('cake_dev',
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"%s cache was unable to write '%s' to %s cache",
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$config,
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$key,
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self::$_engines[$config]->settings['engine']
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),
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E_USER_WARNING
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);
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}
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return $success;
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}
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/**
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* Read a key from the cache. Will automatically use the currently
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* active cache configuration. To set the currently active configuration use
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* Cache::config()
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*
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* ### Usage:
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*
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* Reading from the active cache configuration.
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*
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* `Cache::read('my_data');`
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*
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* Reading from a specific cache configuration.
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*
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* `Cache::read('my_data', 'long_term');`
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*
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* @param string $key Identifier for the data
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* @param string $config optional name of the configuration to use. Defaults to 'default'
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* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
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*/
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public static function read($key, $config = 'default') {
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$settings = self::settings($config);
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if (empty($settings)) {
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return false;
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}
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if (!self::isInitialized($config)) {
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return false;
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}
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$key = self::$_engines[$config]->key($key);
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if (!$key) {
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return false;
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}
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return self::$_engines[$config]->read($settings['prefix'] . $key);
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}
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/**
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* Increment a number under the key and return incremented value.
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*
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* @param string $key Identifier for the data
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* @param integer $offset How much to add
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* @param string $config Optional string configuration name. Defaults to 'default'
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* @return mixed new value, or false if the data doesn't exist, is not integer,
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* or if there was an error fetching it.
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*/
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public static function increment($key, $offset = 1, $config = 'default') {
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$settings = self::settings($config);
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if (empty($settings)) {
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return false;
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}
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if (!self::isInitialized($config)) {
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return false;
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}
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$key = self::$_engines[$config]->key($key);
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if (!$key || !is_int($offset) || $offset < 0) {
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return false;
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}
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$success = self::$_engines[$config]->increment($settings['prefix'] . $key, $offset);
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self::set(null, $config);
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return $success;
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}
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/**
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* Decrement a number under the key and return decremented value.
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*
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* @param string $key Identifier for the data
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* @param integer $offset How much to subtract
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* @param string $config Optional string configuration name. Defaults to 'default'
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* @return mixed new value, or false if the data doesn't exist, is not integer,
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* or if there was an error fetching it
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*/
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public static function decrement($key, $offset = 1, $config = 'default') {
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$settings = self::settings($config);
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if (empty($settings)) {
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return false;
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}
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if (!self::isInitialized($config)) {
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return false;
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}
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$key = self::$_engines[$config]->key($key);
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if (!$key || !is_int($offset) || $offset < 0) {
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return false;
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}
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$success = self::$_engines[$config]->decrement($settings['prefix'] . $key, $offset);
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self::set(null, $config);
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return $success;
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}
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/**
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* Delete a key from the cache.
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*
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* ### Usage:
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*
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* Deleting from the active cache configuration.
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*
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* `Cache::delete('my_data');`
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*
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* Deleting from a specific cache configuration.
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*
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* `Cache::delete('my_data', 'long_term');`
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*
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* @param string $key Identifier for the data
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* @param string $config name of the configuration to use. Defaults to 'default'
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* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
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*/
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public static function delete($key, $config = 'default') {
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$settings = self::settings($config);
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if (empty($settings)) {
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return false;
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}
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if (!self::isInitialized($config)) {
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return false;
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}
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$key = self::$_engines[$config]->key($key);
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if (!$key) {
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return false;
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}
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$success = self::$_engines[$config]->delete($settings['prefix'] . $key);
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self::set(null, $config);
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return $success;
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}
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/**
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* Delete all keys from the cache.
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*
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* @param boolean $check if true will check expiration, otherwise delete all
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* @param string $config name of the configuration to use. Defaults to 'default'
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* @return boolean True if the cache was successfully cleared, false otherwise
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*/
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public static function clear($check = false, $config = 'default') {
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if (!self::isInitialized($config)) {
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return false;
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}
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$success = self::$_engines[$config]->clear($check);
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self::set(null, $config);
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return $success;
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}
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/**
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* Delete all keys from the cache belonging to the same group.
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*
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* @param string $group name of the group to be cleared
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* @param string $config name of the configuration to use. Defaults to 'default'
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* @return boolean True if the cache group was successfully cleared, false otherwise
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*/
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public static function clearGroup($group, $config = 'default') {
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if (!self::isInitialized($config)) {
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return false;
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}
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$success = self::$_engines[$config]->clearGroup($group);
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self::set(null, $config);
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return $success;
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}
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/**
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* Check if Cache has initialized a working config for the given name.
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*
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* @param string $config name of the configuration to use. Defaults to 'default'
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* @return boolean Whether or not the config name has been initialized.
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*/
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public static function isInitialized($config = 'default') {
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if (Configure::read('Cache.disable')) {
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return false;
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}
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return isset(self::$_engines[$config]);
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}
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/**
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* Return the settings for the named cache engine.
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*
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* @param string $name Name of the configuration to get settings for. Defaults to 'default'
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* @return array list of settings for this engine
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* @see Cache::config()
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*/
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public static function settings($name = 'default') {
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if (!empty(self::$_engines[$name])) {
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return self::$_engines[$name]->settings();
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}
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return array();
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}
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/**
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* Retrieve group names to config mapping.
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*
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* {{{
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* Cache::config('daily', array(
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* 'duration' => '1 day', 'groups' => array('posts')
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|
* ));
|
|
* Cache::config('weekly', array(
|
|
* 'duration' => '1 week', 'groups' => array('posts', 'archive')
|
|
* ));
|
|
* $configs = Cache::groupConfigs('posts');
|
|
* }}}
|
|
*
|
|
* $config will equal to `array('posts' => array('daily', 'weekly'))`
|
|
*
|
|
* @param string $group group name or null to retrieve all group mappings
|
|
* @return array map of group and all configuration that has the same group
|
|
* @throws CacheException
|
|
*/
|
|
public static function groupConfigs($group = null) {
|
|
if ($group === null) {
|
|
return self::$_groups;
|
|
}
|
|
if (isset(self::$_groups[$group])) {
|
|
return array($group => self::$_groups[$group]);
|
|
}
|
|
throw new CacheException(__d('cake_dev', 'Invalid cache group %s', $group));
|
|
}
|
|
|
|
}
|