/**
* 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 Kohana_Exception('cache.undefined_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 Kohana_Exception('core.driver_not_found', $this->config['driver'], get_class($this));
}
// Initialize the driver
$this->driver = new $driver($this->config['params']);
// Validate the driver
if (!$this->driver instanceof Cache_Driver) {
throw new Kohana_Exception('core.driver_implements', $this->config['driver'], get_class($this), 'Cache_Driver');
}
Kohana::log('debug', 'Cache Library initialized');
if (self::$loaded !== TRUE) {
$this->config['requests'] = (int) $this->config['requests'];
if ($this->config['requests'] > 0 and mt_rand(1, $this->config['requests']) === 1) {
// Do garbage collection
$this->driver->delete_expired();
Kohana::log('debug', 'Cache: Expired caches deleted.');
}
// Cache has been loaded once
self::$loaded = TRUE;
}
}
