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<?php
/**
* StatusNet, the distributed open-source microblogging tool
*
* Wrapper for fetching lists of popular notices.
*
* PHP version 5
*
* LICENCE: 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/>.
*
* @category Widget
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @author Brion Vibber <brion@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET') && !defined('LACONICA')) {
exit(1);
}
/**
* Wrapper for fetching notices ranked according to popularity,
* broken out so it can be called from multiple actions with
* less code duplication.
*/
class Popularity
{
public $limit = NOTICES_PER_PAGE;
public $offset = 0;
public $tag = false;
public $expiry = 600;
/**
* Run a cached query to fetch notices, whee!
*
* @return Notice
*/
function getNotices()
{
// @fixme there should be a common func for this
if (common_config('db', 'type') == 'pgsql') {
if (!empty($this->out->tag)) {
$tag = pg_escape_string($this->out->tag);
}
} else {
if (!empty($this->out->tag)) {
$tag = mysql_escape_string($this->out->tag);
}
}
$weightexpr = common_sql_weight('fave.modified', common_config('popular', 'dropoff'));
$cutoff = sprintf("fave.modified > '%s'",
common_sql_date(time() - common_config('popular', 'cutoff')));
$qry = "SELECT notice.*, $weightexpr as weight ";
if(isset($tag)) {
$qry .= 'FROM notice_tag, notice JOIN fave ON notice.id = fave.notice_id ' .
"WHERE $cutoff and notice.id = notice_tag.notice_id and '$tag' = notice_tag.tag";
} else {
$qry .= 'FROM notice JOIN fave ON notice.id = fave.notice_id ' .
"WHERE $cutoff";
}
$qry .= ' GROUP BY notice.id,notice.profile_id,notice.content,notice.uri,' .
'notice.rendered,notice.url,notice.created,notice.modified,' .
'notice.reply_to,notice.is_local,notice.source,notice.conversation, ' .
'notice.lat,notice.lon,location_id,location_ns,notice.repeat_of';
$qry .= ' ORDER BY weight DESC';
$offset = $this->offset;
$limit = $this->limit + 1;
$qry .= ' LIMIT ' . $limit . ' OFFSET ' . $offset;
$notice = Memcached_DataObject::cachedQuery('Notice',
$qry,
1200);
return $notice;
}
}
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