class.ilMailUserCache.php

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<?php
/* Copyright (c) 1998-2012 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilMailUserCache
{
        protected static $user_instances = array();

        protected static $requested_usr_ids = array();

        protected static $requested_usr_ids_key_map = array();

        public static function preloadUserObjects(array $usr_ids)
        {
                global $ilDB;

                $usr_ids_to_request              = array_diff($usr_ids, self::$requested_usr_ids);
                self::$requested_usr_ids         = array_merge(self::$requested_usr_ids, $usr_ids_to_request);
                self::$requested_usr_ids_key_map = array_flip(self::$requested_usr_ids);

                if($usr_ids_to_request)
                {
                        $in    = $ilDB->in('ud.usr_id', $usr_ids_to_request, false, 'integer');
                        $query = "
                                SELECT ud.usr_id, login, firstname, lastname, title, gender, pprof.value public_profile,pup.value public_upload
                                FROM usr_data ud
                                LEFT JOIN usr_pref pprof ON pprof.usr_id = ud.usr_id AND pprof.keyword = %s
                                LEFT JOIN usr_pref pup ON pup.usr_id = ud.usr_id AND pup.keyword = %s
                                WHERE $in
                        ";

                        $res = $ilDB->queryF(
                                $query,
                                array('text', 'text', 'text'),
                                array('public_profile', 'public_gender', 'public_upload')
                        );

                        while($row = $ilDB->fetchAssoc($res))
                        {
                                $user = new ilObjUser;
                                $user->setId($row['usr_id']);
                                $user->setLogin($row['login']);
                                $user->setGender($row['gender']);
                                $user->setTitle($row['title']);
                                $user->setFirstname($row['firstname']);
                                $user->setLastname($row['lastname']);
                                $user->setPref('public_profile', $row['public_profile']);
                                $user->setPref('public_upload', $row['public_upload']);

                                self::$user_instances[$row['usr_id']] = $user;
                        }
                }
        }

        public static function getUserObjectById($usr_id)
        {
                if(!$usr_id)
                {
                        return NULL;
                }
                
                if(!array_key_exists($usr_id, self::$requested_usr_ids_key_map))
                {
                        self::preloadUserObjects(array($usr_id));
                }

                return isset(self::$user_instances[$usr_id]) ? self::$user_instances[$usr_id] : NULL;
        }
}