Pgache

Pgcache.php

<?php

/**
 * Pgcache is a library used for caching elements using the built-in cache driver
 *
 * @author Demostenes Garcia <me@demogar.com>
 */
class Pgcache
{

	// CI Object
	protected $ci;
	
	/**
	 * Constructor, get the instance of codeigniter's singleton object
	 */
	function __construct()
	{
		$this->ci =& get_instance();
		$this->ci->load->driver('cache', array('adapter' => 'file'));

		log_message('debug', "Pgcache initialized");
	}

	/**
	 * Generate the name for the cache file. Internally used
	 *
	 * @param prefix
	 * @param class
	 * @param method
	 * @param params
	 */
	private function _generate_name($prefix, $class, $method, $params)
	{
		return $class . "_" . $prefix . "_" . $method . "_" . str_replace( ",", "_", implode($params) );
	}

	/**
	 * Method that caches a model call result
	 *
	 * @param model
	 * @param method
	 * @param params
	 * @param expires
	 */
	public function model($model, $method, $params = array(), $expires = NULL)
	{
		$this->ci->load->model($model);

		if (! is_array($params)) $params = (array) $params;

		$params		= array_values($params);
		$cache_name	= $this->_generate_name( "m", $model, $method, $params );
		$item		= $this->ci->cache->get($cache_name);

		if ($item)
		{
			return unserialize($item);
		}
		else
		{
			$item = call_user_func_array( array($this->ci->$model, $method), $params );
			$this->ci->cache->save( $cache_name, serialize($item), $expires );
			return $item;
		}
	}
}

/* End of file: Pgcache.php */