Merge "Moved ChronologyProtector to its own file."

[lhc/web/wiklou.git] / includes / db / LBFactory.php

diff --git a/includes/db/LBFactory.php b/includes/db/LBFactory.php
index 23af35d..55d1850 100644 (file)
--- a/includes/db/LBFactory.php
+++ b/includes/db/LBFactory.php
@@ -324,76 +324,3 @@ class DBAccessError extends MWException {
                parent::__construct( "Mediawiki tried to access the database via wfGetDB(). This is not allowed." );
        }
 }
-
-/**
- * Class for ensuring a consistent ordering of events as seen by the user, despite replication.
- * Kind of like Hawking's [[Chronology Protection Agency]].
- */
-class ChronologyProtector {
-       var $startupPos;
-       var $shutdownPos = array();
-
-       /**
-        * Initialise a LoadBalancer to give it appropriate chronology protection.
-        *
-        * @param $lb LoadBalancer
-        */
-       function initLB( $lb ) {
-               if ( $this->startupPos === null ) {
-                       if ( !empty( $_SESSION[__CLASS__] ) ) {
-                               $this->startupPos = $_SESSION[__CLASS__];
-                       }
-               }
-               if ( !$this->startupPos ) {
-                       return;
-               }
-               $masterName = $lb->getServerName( 0 );
-
-               if ( $lb->getServerCount() > 1 && !empty( $this->startupPos[$masterName] ) ) {
-                       $info = $lb->parentInfo();
-                       $pos = $this->startupPos[$masterName];
-                       wfDebug( __METHOD__ . ": LB " . $info['id'] . " waiting for master pos $pos\n" );
-                       $lb->waitFor( $this->startupPos[$masterName] );
-               }
-       }
-
-       /**
-        * Notify the ChronologyProtector that the LoadBalancer is about to shut
-        * down. Saves replication positions.
-        *
-        * @param $lb LoadBalancer
-        */
-       function shutdownLB( $lb ) {
-               // Don't start a session, don't bother with non-replicated setups
-               if ( strval( session_id() ) == '' || $lb->getServerCount() <= 1 ) {
-                       return;
-               }
-               $masterName = $lb->getServerName( 0 );
-               if ( isset( $this->shutdownPos[$masterName] ) ) {
-                       // Already done
-                       return;
-               }
-               // Only save the position if writes have been done on the connection
-               $db = $lb->getAnyOpenConnection( 0 );
-               $info = $lb->parentInfo();
-               if ( !$db || !$db->doneWrites() ) {
-                       wfDebug( __METHOD__ . ": LB {$info['id']}, no writes done\n" );
-                       return;
-               }
-               $pos = $db->getMasterPos();
-               wfDebug( __METHOD__ . ": LB {$info['id']} has master pos $pos\n" );
-               $this->shutdownPos[$masterName] = $pos;
-       }
-
-       /**
-        * Notify the ChronologyProtector that the LBFactory is done calling shutdownLB() for now.
-        * May commit chronology data to persistent storage.
-        */
-       function shutdown() {
-               if ( session_id() != '' && count( $this->shutdownPos ) ) {
-                       wfDebug( __METHOD__ . ": saving master pos for " .
-                               count( $this->shutdownPos ) . " master(s)\n" );
-                       $_SESSION[__CLASS__] = $this->shutdownPos;
-               }
-       }
-}