class.arObjectCache.php

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<?php
require_once(dirname(__FILE__) . '/../Exception/class.arException.php');

class arObjectCache {

        protected static $cache = array();


        public static function isCached($class, $id) {
                if (!isset(self::$cache[$class])) {
                        return false;
                }
                if (!isset(self::$cache[$class][$id]) || !self::$cache[$class][$id] instanceof ActiveRecord) {
                        return false;
                }

                return in_array($id, array_keys(self::$cache[$class]));
        }


        public static function store(ActiveRecord $object) {
                if (!isset($object->is_new)) {
                        self::$cache[get_class($object)][$object->getPrimaryFieldValue()] = $object;
                }
        }


        public static function printStats() {
                foreach (self::$cache as $class => $objects) {
                        echo $class;
                        echo ": ";
                        echo count($objects);
                        echo " Objects<br>";
                }
        }


        public static function get($class, $id) {
                if (!self::isCached($class, $id)) {
                        throw new arException(arException::GET_UNCACHED_OBJECT, $class . ': ' . $id);
                }

                return self::$cache[$class][$id];
        }


        public static function purge(ActiveRecord $object) {
                unset(self::$cache[get_class($object)][$object->getPrimaryFieldValue()]);
        }


        public static function flush($class_name) {
                if ($class_name instanceof ActiveRecord) {
                        $class_name = get_class($class_name);
                }
                unset(self::$cache[$class_name]);
        }
}

?>