1 files changed, 79 insertions, 0 deletions
diff --git a/includes/cache/bloom/BloomFilters.php b/includes/cache/bloom/BloomFilters.php
new file mode 100644
index 00000000..9b710d79
--- /dev/null
+++ b/includes/cache/bloom/BloomFilters.php
@@ -0,0 +1,79 @@
+<?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;
+	}
+}