<?php

require_once 'SessionInterface.php';
require_once 'services/MyResearch/lib/Session.php';

class MySQLSession extends SessionInterface {
   static public function read($sess_id) {
      $s = new Session();
      $s->session_id = $sess_id;

      if ($s->find(true)) {
         // enforce lifetime of this session data
         if ($s->last_used + self::$lifetime > time()) {
            $s->last_used = time();
            $s->update();
            return $s->data;
         } else {
            $s->delete();
            return '';
         }
      } else {
         // in seconds - easier for calcuating duration
         $s->last_used = time();
         // in date format - easier to read
         $s->created = date('Y-m-d h:i:s');
         $s->insert();
         return '';
      }
   }

   static public function write($sess_id, $data) {
      $s = new Session();
      $s->session_id = $sess_id;
      if ($s->find(true)) {
         $s->data = $data;
         return $s->update();
      } else {
         return false;
      }
   }

   static public function destroy($sess_id) {
      // Perform standard actions required by all session methods:
      parent::destroy($sess_id);
      
      // Now do database-specific destruction:
      $s = new Session();
      $s->session_id = $sess_id;
      return $s->delete();
   }

   static public function gc($sess_maxlifetime) {
      $s = new Session();
      $s->whereAdd('last_used + ' . $sess_maxlifetime . ' < ' . time());
      $s->delete(true);
   }

}


?>