<?php

	class kCache extends Params {
	
		/**
		* Connection to database
		*
		* @var kDBConnection
		* @access public
		*/
		var $Conn;
		
		var $statistics = Array();
		var $debugCache = false;
		
		function kCache($params_str = null) {
			parent::Params($params_str);
			$this->Conn =& $this->Application->GetADODBConnection();
			
			$this->debugCache = $this->Application->isDebugMode() && dbg_ConstOn('DBG_CACHE');
		}
		
		/**
		 * Adds new value to cache $cache_name and identified by key $key
		 *
		 * @param string $cache_name cache name
		 * @param int $key key name to add to cache
		 * @param mixed $value value of chached record
		 */
		function setCache($cache_name, $key, $value)
		{
			$cache = $this->Get($cache_name, Array());
			$cache[$key] = $value;
			$this->Set($cache_name, $cache);
		}
		
		/**
		 * Returns cached $key value from cache named $cache_name
		 *
		 * @param string $cache_name cache name
		 * @param int $key key name from cache
		 * @return mixed
		 */
		function getCache($cache_name, $key)
		{
			$cache = $this->Get($cache_name, Array());
			$ret = getArrayValue($cache, $key);
			
			$this->setStatistics($cache_name, $key, $ret);
			
			return $ret;
		}
		
		function setStatistics($cache_name, $key, $found)
		{
			if (!$this->debugCache) return true;
			
			if (!isset($this->statistics[$cache_name])) {
				$this->statistics[$cache_name] = Array();
			}
			
			if (!isset($this->statistics[$cache_name][$key])) {
				$this->statistics[$cache_name][$key] = Array();
			}
			
			$status_key = $found ? 'found' : 'not_found';
			if (!isset($this->statistics[$cache_name][$key][$status_key])) {
				$this->statistics[$cache_name][$key][$status_key] = 0;
			}
			
			$this->statistics[$cache_name][$key][$status_key]++;
		}
		
		function printStatistics()
		{
			foreach ($this->statistics as $cache_name => $cache_data) {
				foreach ($cache_data as $key => $value) {
					if (!isset($value['found']) || $value['found'] == 1) {
						// remove cached records, that were used only 1 or 2 times
						unset($this->statistics[$cache_name][$key]);
					}
				}
			}
			
			print_pre($this->statistics);
		}
	}

?>