mirror of
https://github.com/kamilwylegala/cakephp2-php8.git
synced 2024-11-15 11:28:25 +00:00
589 lines
17 KiB
PHP
589 lines
17 KiB
PHP
<?php
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/**
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* Caching for CakePHP.
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*
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*
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* PHP 5
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package cake.libs
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* @since CakePHP(tm) v 1.2.0.4933
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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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.libs
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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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* 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:
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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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* To get the settings for a configuration, and set it as the currently selected configuration
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*
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* `Cache::config('default');`
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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 $settings Optional associative array of settings passed to the engine
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* @return array(engine, settings) on success, false on failure
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* @throws CacheException
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*/
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public static function config($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[$name]['engine'])) {
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return false;
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}
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$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 $name Name of the config array that needs an engine instance built
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* @return void
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*/
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protected static function _buildEngine($name) {
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$config = self::$_config[$name];
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list($plugin, $class) = pluginSplit($config['engine']);
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$cacheClass = $class . 'Engine';
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if (!class_exists($cacheClass) && self::_loadEngine($class, $plugin) === false) {
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return false;
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}
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$cacheClass = $class . 'Engine';
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if (!is_subclass_of($cacheClass, 'CacheEngine')) {
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throw new CacheException(__('Cache engines must use CacheEngine as a base class.'));
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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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if (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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return false;
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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 $name A currently configured cache config you wish to remove.
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* @return boolen success of the removal, returns false when the config does not exist.
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*/
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public static function drop($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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* Tries to find and include a file for a cache engine and returns object instance
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*
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* @param $name Name of the engine (without 'Engine')
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* @return mixed $engine object or null
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*/
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protected static function _loadEngine($name, $plugin = null) {
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if ($plugin) {
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return App::import('Lib', $plugin . '.cache' . DS . $name, false);
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} else {
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$core = App::core();
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$path = $core['libs'][0] . 'cache' . DS . strtolower($name) . '.php';
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if (file_exists($path)) {
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require $path;
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return true;
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}
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return App::import('Lib', 'cache' . DS . $name, false);
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}
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}
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/**
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* Temporarily change the settings on a cache config. The settings will persist for the next write
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* operation (write, decrement, increment, clear). Any reads that are done before the write, will
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* use the modified settings. If `$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 mixed $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 $config The config name you wish to have garbage collected. Defaults to 'default'
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* @return void
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*/
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public static function gc($config = 'default') {
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self::$_engines[$config]->gc();
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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 null;
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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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__("%s cache was unable to write '%s' to cache", $config, $key),
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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 null;
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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 null;
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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_integer($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 substract
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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 null;
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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_integer($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 $config name of the configuration to use. Defaults to 'default'
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* @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed
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*/
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public static function delete($key, $config = 'default') {
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$settings = self::settings($config);
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if (empty($settings)) {
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return null;
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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 $config name of the configuration to use. Defaults to 'default'
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* @return boolean True if the cache was succesfully cleared, false otherwise
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*/
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public static function clear($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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* Check if Cache has initialized a working config for the given name.
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*
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* @param string $engine Name of the engine, Defaults to default
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* @param string $config Name of the configuration setting
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* @return bool Whether or not the config name has been initialized.
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*/
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public static function isInitialized($name = '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::$_engines[$name]);
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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 $engine Name of the configuration to get settings for. Defaults to 'default'
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* @return array list of settings for this engine
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* @see Cache::config()
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* @access public
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* @static
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*/
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public static function settings($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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/**
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* Storage engine for CakePHP caching
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*
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* @package cake.libs
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*/
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abstract class CacheEngine {
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/**
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* Settings of current engine instance
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*
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* @var int
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* @access public
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*/
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public $settings = array();
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/**
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* Initialize the cache engine
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*
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* Called automatically by the cache frontend
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*
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* @param array $params Associative array of parameters for the engine
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* @return boolean True if the engine has been succesfully initialized, false if not
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*/
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public function init($settings = array()) {
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$this->settings = array_merge(
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array('prefix' => 'cake_', 'duration'=> 3600, 'probability'=> 100),
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$this->settings,
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$settings
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);
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if (!is_numeric($this->settings['duration'])) {
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$this->settings['duration'] = strtotime($this->settings['duration']) - time();
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}
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return true;
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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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* @return void
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*/
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public function gc() { }
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/**
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* Write value for a key into cache
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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
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* @param mixed $duration How long to cache for.
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* @return boolean True if the data was succesfully cached, false on failure
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*/
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abstract public function write($key, $value, $duration);
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/**
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* Read a key from the cache
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*
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* @param string $key Identifier for the data
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* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
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*/
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abstract public function read($key);
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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 $offset How much to add
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* @return New incremented value, false otherwise
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*/
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abstract public function increment($key, $offset = 1);
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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 $value How much to substract
|
|
* @return New incremented value, false otherwise
|
|
*/
|
|
abstract public function decrement($key, $offset = 1);
|
|
|
|
/**
|
|
* Delete a key from the cache
|
|
*
|
|
* @param string $key Identifier for the data
|
|
* @return boolean True if the value was succesfully deleted, false if it didn't exist or couldn't be removed
|
|
*/
|
|
abstract public function delete($key);
|
|
|
|
/**
|
|
* Delete all keys from the cache
|
|
*
|
|
* @param boolean $check if true will check expiration, otherwise delete all
|
|
* @return boolean True if the cache was succesfully cleared, false otherwise
|
|
*/
|
|
abstract public function clear($check);
|
|
|
|
/**
|
|
* Cache Engine settings
|
|
*
|
|
* @return array settings
|
|
*/
|
|
public function settings() {
|
|
return $this->settings;
|
|
}
|
|
|
|
/**
|
|
* Generates a safe key for use with cache engine storage engines.
|
|
*
|
|
* @param string $key the key passed over
|
|
* @return mixed string $key or false
|
|
*/
|
|
public function key($key) {
|
|
if (empty($key)) {
|
|
return false;
|
|
}
|
|
$key = Inflector::underscore(str_replace(array(DS, '/', '.'), '_', strval($key)));
|
|
return $key;
|
|
}
|
|
}
|