2011-07-20 12:57:07 +00:00
|
|
|
<?php defined('SYSPATH') or die('No direct script access.');
|
|
|
|
/**
|
|
|
|
* Kohana Cache provides a common interface to a variety of caching engines. Tags are
|
2013-04-13 06:17:56 +00:00
|
|
|
* supported where available natively to the cache system. Kohana Cache supports multiple
|
2011-07-20 12:57:07 +00:00
|
|
|
* instances of cache engines through a grouped singleton pattern.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* ### Supported cache engines
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* * [APC](http://php.net/manual/en/book.apc.php)
|
|
|
|
* * [eAccelerator](http://eaccelerator.net/)
|
|
|
|
* * File
|
|
|
|
* * [Memcache](http://memcached.org/)
|
|
|
|
* * [Memcached-tags](http://code.google.com/p/memcached-tags/)
|
|
|
|
* * [SQLite](http://www.sqlite.org/)
|
|
|
|
* * [Xcache](http://xcache.lighttpd.net/)
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* ### Introduction to caching
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Caching should be implemented with consideration. Generally, caching the result of resources
|
|
|
|
* is faster than reprocessing them. Choosing what, how and when to cache is vital. PHP APC is
|
|
|
|
* presently one of the fastest caching systems available, closely followed by Memcache. SQLite
|
|
|
|
* and File caching are two of the slowest cache methods, however usually faster than reprocessing
|
|
|
|
* a complex set of instructions.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Caching engines that use memory are considerably faster than the file based alternatives. But
|
|
|
|
* memory is limited whereas disk space is plentiful. If caching large datasets it is best to use
|
|
|
|
* file caching.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* ### Configuration settings
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Kohana Cache uses configuration groups to create cache instances. A configuration group can
|
|
|
|
* use any supported driver, with successive groups using the same driver type if required.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* #### Configuration example
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Below is an example of a _memcache_ server configuration.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* return array(
|
|
|
|
* 'default' => array( // Default group
|
|
|
|
* 'driver' => 'memcache', // using Memcache driver
|
|
|
|
* 'servers' => array( // Available server definitions
|
|
|
|
* array(
|
|
|
|
* 'host' => 'localhost',
|
|
|
|
* 'port' => 11211,
|
|
|
|
* 'persistent' => FALSE
|
|
|
|
* )
|
|
|
|
* ),
|
|
|
|
* 'compression' => FALSE, // Use compression?
|
|
|
|
* ),
|
|
|
|
* )
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* In cases where only one cache group is required, if the group is named `default` there is
|
|
|
|
* no need to pass the group name when instantiating a cache instance.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* #### General cache group configuration settings
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Below are the settings available to all types of cache driver.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Name | Required | Description
|
|
|
|
* -------------- | -------- | ---------------------------------------------------------------
|
|
|
|
* driver | __YES__ | (_string_) The driver type to use
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Details of the settings specific to each driver are available within the drivers documentation.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* ### System requirements
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* * Kohana 3.0.x
|
|
|
|
* * PHP 5.2.4 or greater
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* @package Kohana/Cache
|
|
|
|
* @category Base
|
|
|
|
* @version 2.0
|
|
|
|
* @author Kohana Team
|
2013-04-13 06:17:56 +00:00
|
|
|
* @copyright (c) 2009-2012 Kohana Team
|
2011-07-20 12:57:07 +00:00
|
|
|
* @license http://kohanaphp.com/license
|
|
|
|
*/
|
|
|
|
abstract class Kohana_Cache {
|
|
|
|
|
|
|
|
const DEFAULT_EXPIRE = 3600;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @var string default driver to use
|
|
|
|
*/
|
|
|
|
public static $default = 'file';
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @var Kohana_Cache instances
|
|
|
|
*/
|
|
|
|
public static $instances = array();
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Creates a singleton of a Kohana Cache group. If no group is supplied
|
|
|
|
* the __default__ cache group is used.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Create an instance of the default group
|
|
|
|
* $default_group = Cache::instance();
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Create an instance of a group
|
|
|
|
* $foo_group = Cache::instance('foo');
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Access an instantiated group directly
|
|
|
|
* $foo_group = Cache::$instances['default'];
|
|
|
|
*
|
2013-04-13 06:17:56 +00:00
|
|
|
* @param string $group the name of the cache group to use [Optional]
|
|
|
|
* @return Cache
|
|
|
|
* @throws Cache_Exception
|
2011-07-20 12:57:07 +00:00
|
|
|
*/
|
|
|
|
public static function instance($group = NULL)
|
|
|
|
{
|
|
|
|
// If there is no group supplied
|
|
|
|
if ($group === NULL)
|
|
|
|
{
|
|
|
|
// Use the default setting
|
|
|
|
$group = Cache::$default;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (isset(Cache::$instances[$group]))
|
|
|
|
{
|
|
|
|
// Return the current group if initiated already
|
|
|
|
return Cache::$instances[$group];
|
|
|
|
}
|
|
|
|
|
2013-04-13 06:17:56 +00:00
|
|
|
$config = Kohana::$config->load('cache');
|
2011-07-20 12:57:07 +00:00
|
|
|
|
|
|
|
if ( ! $config->offsetExists($group))
|
|
|
|
{
|
2013-04-13 06:17:56 +00:00
|
|
|
throw new Cache_Exception(
|
|
|
|
'Failed to load Kohana Cache group: :group',
|
|
|
|
array(':group' => $group)
|
|
|
|
);
|
2011-07-20 12:57:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
$config = $config->get($group);
|
|
|
|
|
|
|
|
// Create a new cache type instance
|
|
|
|
$cache_class = 'Cache_'.ucfirst($config['driver']);
|
|
|
|
Cache::$instances[$group] = new $cache_class($config);
|
|
|
|
|
|
|
|
// Return the instance
|
|
|
|
return Cache::$instances[$group];
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @var Config
|
|
|
|
*/
|
2013-04-13 06:17:56 +00:00
|
|
|
protected $_config = array();
|
2011-07-20 12:57:07 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* Ensures singleton pattern is observed, loads the default expiry
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
|
|
|
* @param array $config configuration
|
2011-07-20 12:57:07 +00:00
|
|
|
*/
|
|
|
|
protected function __construct(array $config)
|
|
|
|
{
|
2013-04-13 06:17:56 +00:00
|
|
|
$this->config($config);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Getter and setter for the configuration. If no argument provided, the
|
|
|
|
* current configuration is returned. Otherwise the configuration is set
|
|
|
|
* to this class.
|
|
|
|
*
|
|
|
|
* // Overwrite all configuration
|
|
|
|
* $cache->config(array('driver' => 'memcache', '...'));
|
|
|
|
*
|
|
|
|
* // Set a new configuration setting
|
|
|
|
* $cache->config('servers', array(
|
|
|
|
* 'foo' => 'bar',
|
|
|
|
* '...'
|
|
|
|
* ));
|
|
|
|
*
|
|
|
|
* // Get a configuration setting
|
|
|
|
* $servers = $cache->config('servers);
|
|
|
|
*
|
|
|
|
* @param mixed key to set to array, either array or config path
|
|
|
|
* @param mixed value to associate with key
|
|
|
|
* @return mixed
|
|
|
|
*/
|
|
|
|
public function config($key = NULL, $value = NULL)
|
|
|
|
{
|
|
|
|
if ($key === NULL)
|
|
|
|
return $this->_config;
|
|
|
|
|
|
|
|
if (is_array($key))
|
|
|
|
{
|
|
|
|
$this->_config = $key;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
if ($value === NULL)
|
|
|
|
return Arr::get($this->_config, $key);
|
|
|
|
|
|
|
|
$this->_config[$key] = $value;
|
|
|
|
}
|
|
|
|
|
|
|
|
return $this;
|
2011-07-20 12:57:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Overload the __clone() method to prevent cloning
|
|
|
|
*
|
|
|
|
* @return void
|
2013-04-13 06:17:56 +00:00
|
|
|
* @throws Cache_Exception
|
2011-07-20 12:57:07 +00:00
|
|
|
*/
|
2013-04-13 06:17:56 +00:00
|
|
|
final public function __clone()
|
2011-07-20 12:57:07 +00:00
|
|
|
{
|
2013-04-13 06:17:56 +00:00
|
|
|
throw new Cache_Exception('Cloning of Kohana_Cache objects is forbidden');
|
2011-07-20 12:57:07 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Retrieve a cached value entry by id.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Retrieve cache entry from default group
|
|
|
|
* $data = Cache::instance()->get('foo');
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Retrieve cache entry from default group and return 'bar' if miss
|
|
|
|
* $data = Cache::instance()->get('foo', 'bar');
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Retrieve cache entry from memcache group
|
|
|
|
* $data = Cache::instance('memcache')->get('foo');
|
|
|
|
*
|
2013-04-13 06:17:56 +00:00
|
|
|
* @param string $id id of cache to entry
|
|
|
|
* @param string $default default value to return if cache miss
|
2011-07-20 12:57:07 +00:00
|
|
|
* @return mixed
|
2013-04-13 06:17:56 +00:00
|
|
|
* @throws Cache_Exception
|
2011-07-20 12:57:07 +00:00
|
|
|
*/
|
|
|
|
abstract public function get($id, $default = NULL);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Set a value to cache with id and lifetime
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* $data = 'bar';
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Set 'bar' to 'foo' in default group, using default expiry
|
|
|
|
* Cache::instance()->set('foo', $data);
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Set 'bar' to 'foo' in default group for 30 seconds
|
|
|
|
* Cache::instance()->set('foo', $data, 30);
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Set 'bar' to 'foo' in memcache group for 10 minutes
|
|
|
|
* if (Cache::instance('memcache')->set('foo', $data, 600))
|
|
|
|
* {
|
|
|
|
* // Cache was set successfully
|
|
|
|
* return
|
|
|
|
* }
|
|
|
|
*
|
2013-04-13 06:17:56 +00:00
|
|
|
* @param string $id id of cache entry
|
|
|
|
* @param string $data data to set to cache
|
|
|
|
* @param integer $lifetime lifetime in seconds
|
2011-07-20 12:57:07 +00:00
|
|
|
* @return boolean
|
|
|
|
*/
|
|
|
|
abstract public function set($id, $data, $lifetime = 3600);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Delete a cache entry based on id
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Delete 'foo' entry from the default group
|
|
|
|
* Cache::instance()->delete('foo');
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Delete 'foo' entry from the memcache group
|
|
|
|
* Cache::instance('memcache')->delete('foo')
|
|
|
|
*
|
2013-04-13 06:17:56 +00:00
|
|
|
* @param string $id id to remove from cache
|
2011-07-20 12:57:07 +00:00
|
|
|
* @return boolean
|
|
|
|
*/
|
|
|
|
abstract public function delete($id);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Delete all cache entries.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* Beware of using this method when
|
|
|
|
* using shared memory cache systems, as it will wipe every
|
|
|
|
* entry within the system for all clients.
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Delete all cache entries in the default group
|
|
|
|
* Cache::instance()->delete_all();
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
2011-07-20 12:57:07 +00:00
|
|
|
* // Delete all cache entries in the memcache group
|
|
|
|
* Cache::instance('memcache')->delete_all();
|
|
|
|
*
|
|
|
|
* @return boolean
|
|
|
|
*/
|
|
|
|
abstract public function delete_all();
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Replaces troublesome characters with underscores.
|
|
|
|
*
|
|
|
|
* // Sanitize a cache id
|
|
|
|
* $id = $this->_sanitize_id($id);
|
2013-04-13 06:17:56 +00:00
|
|
|
*
|
|
|
|
* @param string $id id of cache to sanitize
|
2011-07-20 12:57:07 +00:00
|
|
|
* @return string
|
|
|
|
*/
|
|
|
|
protected function _sanitize_id($id)
|
|
|
|
{
|
|
|
|
// Change slashes and spaces to underscores
|
|
|
|
return str_replace(array('/', '\\', ' '), '_', $id);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// End Kohana_Cache
|