Kohana Cache APC driver. Provides an opcode based driver for the Kohana Cache library.
Below is an example of an apc server configuration.
return array(
'apc' => array( // Driver group
'driver' => 'apc', // using APC driver
),
)
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.
Below are the settings available to all types of cache driver.
| Name | Required | Description |
|---|---|---|
| driver | YES | (string) The driver type to use |
Class declared in MODPATH/cache/classes/kohana/cache/apc.php on line 39.
integer 3600
string $defaultdefault driver to use
string(4) "file"Kohana_Cache $instancesinstances
array(0) Config $_configDelete a cache entry based on id
// Delete 'foo' entry from the apc group
Cache::instance('apc')->delete('foo');
string
$id
required - Id to remove from cachebooleanpublic function delete($id)
{
return apc_delete($this->_sanitize_id($id));
}Delete all cache entries.
Beware of using this method when using shared memory cache systems, as it will wipe every entry within the system for all clients.
// Delete all cache entries in the apc group
Cache::instance('apc')->delete_all();
booleanpublic function delete_all()
{
return apc_clear_cache('user');
}Retrieve a cached value entry by id.
// Retrieve cache entry from apc group
$data = Cache::instance('apc')->get('foo');
// Retrieve cache entry from apc group and return 'bar' if miss
$data = Cache::instance('apc')->get('foo', 'bar');
string
$id
required - Id of cache to entrystring
$default
= NULL - Default value to return if cache missmixedpublic function get($id, $default = NULL)
{
$data = apc_fetch($this->_sanitize_id($id), $success);
return $success ? $data : $default;
}Set a value to cache with id and lifetime
$data = 'bar';
// Set 'bar' to 'foo' in apc group, using default expiry
Cache::instance('apc')->set('foo', $data);
// Set 'bar' to 'foo' in apc group for 30 seconds
Cache::instance('apc')->set('foo', $data, 30);
string
$id
required - Id of cache entrystring
$data
required - Data to set to cacheinteger
$lifetime
= NULL - Lifetime in secondsbooleanpublic function set($id, $data, $lifetime = NULL)
{
if ($lifetime === NULL)
{
$lifetime = Arr::get($this->_config, 'default_expire', Cache::DEFAULT_EXPIRE);
}
return apc_store($this->_sanitize_id($id), $data, $lifetime);
}Overload the __clone() method to prevent cloning
voidpublic function __clone()
{
throw new Kohana_Cache_Exception('Cloning of Kohana_Cache objects is forbidden');
}Creates a singleton of a Kohana Cache group. If no group is supplied the default cache group is used.
// Create an instance of the default group
$default_group = Cache::instance();
// Create an instance of a group
$foo_group = Cache::instance('foo');
// Access an instantiated group directly
$foo_group = Cache::$instances['default'];
string
$group
= NULL - The name of the cache group to use [Optional]Cachepublic static function instance($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];
}
$config = Kohana::config('cache');
if ( ! $config->offsetExists($group))
{
throw new Kohana_Cache_Exception('Failed to load Kohana Cache group: :group', array(':group' => $group));
}
$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];
}Check for existence of the APC extension This method cannot be invoked externally. The driver must
be instantiated using the Cache::instance() method.
array
$config
required - Configurationprotected function __construct(array $config)
{
if ( ! extension_loaded('apc'))
{
throw new Kohana_Cache_Exception('PHP APC extension is not available.');
}
parent::__construct($config);
}Replaces troublesome characters with underscores.
// Sanitize a cache id
$id = $this->_sanitize_id($id);
string
$id
required - Id of cache to sanitizestringprotected function _sanitize_id($id)
{
// Change slashes and spaces to underscores
return str_replace(array('/', '\\', ' '), '_', $id);
}