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<?php defined('SYSPATH') OR die('No direct access allowed.');
/**
* Provides a driver-based interface for finding, creating, and deleting cached
* resources. Caches are identified by a unique string. Tagging of caches is
* also supported, and caches can be found and deleted by id or tag.
*
* @package Kohana
* @author Kohana Team
* @copyright (c) 2007-2009 Kohana Team
* @license http://kohanaphp.com/license
*/
class Cache_Core {
protected static $instances = array();
// Configuration
protected $config;
// Driver object
protected $driver;
/**
* Returns a singleton instance of Cache.
*
* @param string configuration
* @return Cache_Core
*/
public static function & instance($config = FALSE)
{
if ( ! isset(Cache::$instances[$config]))
{
// Create a new instance
Cache::$instances[$config] = new Cache($config);
}
return Cache::$instances[$config];
}
/**
* Loads the configured driver and validates it.
*
* @param array|string custom configuration or config group name
* @return void
*/
public function __construct($config = FALSE)
{
if (is_string($config))
{
$name = $config;
// Test the config group name
if (($config = Kohana::config('cache.'.$config)) === NULL)
throw new Cache_Exception('The :group: group is not defined in your configuration.', array(':group:' => $name));
}
if (is_array($config))
{
// Append the default configuration options
$config += Kohana::config('cache.default');
}
else
{
// Load the default group
$config = Kohana::config('cache.default');
}
// Cache the config in the object
$this->config = $config;
// Set driver name
$driver = 'Cache_'.ucfirst($this->config['driver']).'_Driver';
// Load the driver
if ( ! Kohana::auto_load($driver))
throw new Cache_Exception('The :driver: driver for the :class: library could not be found',
array(':driver:' => $this->config['driver'], ':class:' => get_class($this)));
// Initialize the driver
$this->driver = new $driver($this->config['params']);
// Validate the driver
if ( ! ($this->driver instanceof Cache_Driver))
throw new Cache_Exception('The :driver: driver for the :library: library must implement the :interface: interface',
array(':driver:' => $this->config['driver'], ':library:' => get_class($this), ':interface:' => 'Cache_Driver'));
Kohana_Log::add('debug', 'Cache Library initialized');
}
/**
* Set cache items
*/
public function set($key, $value = NULL, $tags = NULL, $lifetime = NULL)
{
if ($lifetime === NULL)
{
$lifetime = $this->config['lifetime'];
}
if ( ! is_array($key))
{
$key = array($key => $value);
}
if ($this->config['prefix'] !== NULL)
{
$key = $this->add_prefix($key);
if ($tags !== NULL)
{
$tags = $this->add_prefix($tags, FALSE);
}
}
return $this->driver->set($key, $tags, $lifetime);
}
/**
* Get a cache items by key
*/
public function get($keys)
{
$single = FALSE;
if ( ! is_array($keys))
{
$keys = array($keys);
$single = TRUE;
}
if ($this->config['prefix'] !== NULL)
{
$keys = $this->add_prefix($keys, FALSE);
if ( ! $single)
{
return $this->strip_prefix($this->driver->get($keys, $single));
}
}
return $this->driver->get($keys, $single);
}
/**
* Get cache items by tags
*/
public function get_tag($tags)
{
if ( ! is_array($tags))
{
$tags = array($tags);
}
if ($this->config['prefix'] !== NULL)
{
$tags = $this->add_prefix($tags, FALSE);
return $this->strip_prefix($this->driver->get_tag($tags));
}
else
{
return $this->driver->get_tag($tags);
}
}
/**
* Delete cache item by key
*/
public function delete($keys)
{
if ( ! is_array($keys))
{
$keys = array($keys);
}
if ($this->config['prefix'] !== NULL)
{
$keys = $this->add_prefix($keys, FALSE);
}
return $this->driver->delete($keys);
}
/**
* Delete cache items by tag
*/
public function delete_tag($tags)
{
if ( ! is_array($tags))
{
$tags = array($tags);
}
if ($this->config['prefix'] !== NULL)
{
$tags = $this->add_prefix($tags, FALSE);
}
return $this->driver->delete_tag($tags);
}
/**
* Empty the cache
*/
public function delete_all()
{
return $this->driver->delete_all();
}
/**
* Add a prefix to keys or tags
*/
protected function add_prefix($array, $to_key = TRUE)
{
$out = array();
foreach($array as $key => $value)
{
if ($to_key)
{
$out[$this->config['prefix'].$key] = $value;
}
else
{
$out[$key] = $this->config['prefix'].$value;
}
}
return $out;
}
/**
* Strip a prefix to keys or tags
*/
protected function strip_prefix($array)
{
$out = array();
$start = strlen($this->config['prefix']);
foreach($array as $key => $value)
{
$out[substr($key, $start)] = $value;
}
return $out;
}
} // End Cache Library
|
