File: time.vsp

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<?vsp 
--  
--  $Id$
--  
--  This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
--  project.
--  
--  Copyright (C) 1998-2012 OpenLink Software
--  
--  This project is free software; you can redistribute it and/or modify it
--  under the terms of the GNU General Public License as published by the
--  Free Software Foundation; only version 2 of the License, dated June 1991.
--  
--  This program is distributed in the hope that it will be useful, but
--  WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
--  General Public License for more details.
--  
--  You should have received a copy of the GNU General Public License along
--  with this program; if not, write to the Free Software Foundation, Inc.,
--  51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
--  
--  

  -- disconnect the client immediately
  set isolation='repeatable';
  http_flush ();

  declare reqs, ct any;
  reqs := http_pending_req ();
  ct := 0;
  foreach (any x in reqs) do
    {
      if (x[1] = http_path ())
        ct := ct + 1;
    }

  -- no more than one thread must run the time wait queue
  if (ct > 1)
    {
      return;
    }

  declare inst, node, scp, scp_inst, ts, conn, unt, cnt, scp_id any;
  declare cr cursor for select tw_inst, tw_node, tw_until, tw_script, tw_scope_inst, tw_script_id
	from BPEL..time_wait where tw_sec > 0;
  whenever not found goto nf;
again:
  cnt := 0;
  ts := now ();
  --dbg_obj_print ('start pooling', ts);
  open cr (exclusive, prefetch 1);
  while (1)
    {
      fetch cr into inst, node, unt, scp, scp_inst, scp_id;
      if (unt < ts)
	{
	  --dbg_obj_print ('expired', inst, node);
	  update BPEL..time_wait set tw_sec = 0 where current of cr;
	  conn := ses_connect ('localhost:' || server_http_port ());
	  ses_write (' \r\n\r\n', conn);
	  http_on_message (conn, 'BPEL.BPEL.ALARM_CALLBACK', vector (inst, node, scp, scp_inst, scp_id));
	  close cr;
	  commit work;
	  goto again;
	}
      cnt := cnt + 1;
   }
nf:
  close cr;
  -- if no in the queue leave the thread
  if (cnt = 0)
    return;
  -- wait a second (resolution is 1 sec)
  commit work; -- release the locks
  delay (1);
  goto again;
?>