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<?php
/*
* Laconica - a distributed open-source microblogging tool
* Copyright (C) 2008, Controlez-Vous, 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/>.
*/
define('CLAIM_TIMEOUT', 1200);
class QueueHandler {
var $_id = 'generic';
function QueueHandler($id=NULL) {
if ($id) {
$this->set_id($id);
}
}
function class_name() {
return ucfirst($this->transport()) . 'Handler';
}
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 handle_queue() {
$this->log(LOG_INFO, 'checking for queued notices');
$transport = $this->transport();
do {
$qi = Queue_item::top($transport);
if ($qi) {
$this->log(LOG_INFO, 'Got item enqueued '.common_exact_date($qi->created));
$notice = Notice::staticGet($qi->notice_id);
if ($notice) {
$this->log(LOG_INFO, 'broadcasting notice ID = ' . $notice->id);
# XXX: what to do if broadcast fails?
$result = $this->handle_notice($notice);
if (!$result) {
$this->log(LOG_WARNING, 'Failed broadcast for notice ID = ' . $notice->id);
$orig = $qi;
$qi->claimed = NULL;
$qi->update($orig);
$this->log(LOG_WARNING, 'Abandoned claim for notice ID = ' . $notice->id);
continue;
}
$this->log(LOG_INFO, 'finished broadcasting notice ID = ' . $notice->id);
$notice = NULL;
} else {
$this->log(LOG_WARNING, 'queue item for notice that does not exist');
}
$qi->delete();
$this->idle();
} else {
$this->clear_old_claims();
$start = microtime();
$this->idle();
$used = microtime() - $start;
if ($used < 5000000) {
usleep(5000000 - $used);
}
}
} while (true);
}
function idle() {
return true;
}
function clear_old_claims() {
$qi = new Queue_item();
$qi->transport = $this->transport();
$qi->whereAdd('now() - claimed > '.CLAIM_TIMEOUT);
$qi->update(DB_DATAOBJECT_WHEREADD_ONLY);
}
function log($level, $msg) {
common_log($level, $this->class_name() . ' ('. $this->get_id() .'): '.$msg);
}
}
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