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<?php
/*
* Laconica - a distributed open-source microblogging tool
* Copyright (C) 2008, 2009, Control Yourself, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
if (!defined('LACONICA')) { exit(1); }
require_once(INSTALLDIR.'/lib/daemon.php');
require_once(INSTALLDIR.'/classes/Queue_item.php');
require_once(INSTALLDIR.'/classes/Notice.php');
define('CLAIM_TIMEOUT', 1200);
define('QUEUE_HANDLER_MISS_IDLE', 10);
define('QUEUE_HANDLER_HIT_IDLE', 10);
class QueueHandler extends Daemon
{
var $_id = 'generic';
function QueueHandler($id=null)
{
if ($id) {
$this->set_id($id);
}
}
function timeout()
{
return null;
}
function class_name()
{
return ucfirst($this->transport()) . 'Handler';
}
function name()
{
return strtolower($this->class_name().'.'.$this->get_id());
}
function get_id()
{
return $this->_id;
}
function set_id($id)
{
$this->_id = $id;
}
function transport()
{
return null;
}
function start()
{
}
function finish()
{
}
function handle_notice($notice)
{
return true;
}
function run()
{
if (!$this->start()) {
return false;
}
$this->log(LOG_INFO, 'checking for queued notices');
$queue = $this->transport();
$timeout = $this->timeout();
$qm = QueueManager::get();
while (true) {
$this->log(LOG_DEBUG, 'Checking for notices...');
$notice = $qm->nextItem($queue, $timeout);
if (empty($notice)) {
$this->log(LOG_DEBUG, 'No notices waiting; idling.');
// Nothing in the queue. Do you
// have other tasks, like servicing your
// XMPP connection, to do?
$this->idle(QUEUE_HANDLER_MISS_IDLE);
} else {
$this->log(LOG_INFO, 'Got notice '. $notice->id);
// Yay! Got one!
if ($this->handle_notice($notice)) {
$this->log(LOG_INFO, 'Successfully handled notice '. $notice->id);
$qm->done($notice, $queue);
} else {
$this->log(LOG_INFO, 'Failed to handle notice '. $notice->id);
$qm->fail($notice, $queue);
}
// Chance to e.g. service your XMPP connection
$this->log(LOG_DEBUG, 'Idling after success.');
$this->idle(QUEUE_HANDLER_HIT_IDLE);
}
// XXX: when do we give up?
}
if (!$this->finish()) {
return false;
}
return true;
}
function idle($timeout=0)
{
if ($timeout > 0) {
sleep($timeout);
}
}
function log($level, $msg)
{
common_log($level, $this->class_name() . ' ('. $this->get_id() .'): '.$msg);
}
}
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