<?php

require_once 'services/MyResearch/lib/Search.php';

class SessionInterface {
    
    static public $lifetime = 3600;
    
    public function init($lt) {
        self::$lifetime = $lt;
        session_set_save_handler(array(get_class($this), 'open'), array(get_class($this),'close'), array(get_class($this),'read'), array(get_class($this),'write'), array(get_class($this),'destroy'), array(get_class($this),'gc'));
        session_start();
    }
    
    // the following need to be static since they are used as callback functions
    static public function open($sess_path, $sess_name) { return true; }
    static public function close() { return true; }
    static public function read($sess_id) { }
    static public function write($sess_id, $data) { }
    
    // IMPORTANT:  The functionality defined in this method is global to all session
    //      mechanisms.  If you override this method, be sure to still call
    //      parent::destroy() in addition to any new behavior.
    static public function destroy($sess_id)
    {
        // Delete the searches stored for this session
        $search = new SearchEntry();
        $searchList = $search->getSearches($sess_id);
        // Make sure there are some
        if (count($searchList) > 0) {
            foreach ($searchList as $oldSearch) {
                // And make sure they aren't saved
                if ($oldSearch->saved == 0) {
                    $oldSearch->delete();
                }
            }
        }
    }
    
   // how often does this get called (if at all)?

   // *** 08/Oct/09 - Greg Pendlebury
   // Clearly this is being called. Production installs with
   //   thousands of sessions active are showing no old sessions.
   // What I can't do is reproduce for testing. It might need the
   //   search delete code from 'destroy()' if it is not calling it.
   // *** 09/Oct/09 - Greg Pendlebury
   // Anecdotal testing Today and Yesterday seems to indicate destroy()
   //   is called by the garbage collector and everything is good.
   // Something to keep in mind though.
    static public function gc($sess_maxlifetime) { }
}

?>