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<?php
/**
* This program 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; either version 2 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 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @author Aaron Schulz
*/
/**
* @since 1.24
*/
class BloomFilterTitleHasLogs {
public static function mergeAndCheck(
BloomCache $bcache, $domain, $virtualKey, array $status
) {
$age = microtime( true ) - $status['asOfTime']; // seconds
$scopedLock = ( mt_rand( 1, (int)pow( 3, max( 0, 5 - $age ) ) ) == 1 )
? $bcache->getScopedLock( $virtualKey )
: false;
if ( $scopedLock ) {
$updates = self::merge( $bcache, $domain, $virtualKey, $status );
if ( isset( $updates['asOfTime'] ) ) {
$age = ( microtime( true ) - $updates['asOfTime'] );
}
}
return ( $age < 30 );
}
public static function merge(
BloomCache $bcache, $domain, $virtualKey, array $status
) {
$limit = 1000;
$dbr = wfGetDB( DB_SLAVE, array(), $domain );
$res = $dbr->select( 'logging',
array( 'log_namespace', 'log_title', 'log_id', 'log_timestamp' ),
array( 'log_id > ' . $dbr->addQuotes( (int)$status['lastID'] ) ),
__METHOD__,
array( 'ORDER BY' => 'log_id', 'LIMIT' => $limit )
);
$updates = array();
if ( $res->numRows() > 0 ) {
$members = array();
foreach ( $res as $row ) {
$members[] = "$virtualKey:{$row->log_namespace}:{$row->log_title}";
}
$lastID = $row->log_id;
$lastTime = $row->log_timestamp;
if ( !$bcache->add( 'shared', $members ) ) {
return false;
}
$updates['lastID'] = $lastID;
$updates['asOfTime'] = wfTimestamp( TS_UNIX, $lastTime );
} else {
$updates['asOfTime'] = microtime( true );
}
$updates['epoch'] = $status['epoch'] ?: microtime( true );
$bcache->setStatus( $virtualKey, $updates );
return $updates;
}
}
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