MediaWiki  1.23.8
ChronologyProtector.php
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1 <?php
30  protected $startupPositions = array();
31 
33  protected $shutdownPositions = array();
34 
36  protected $initialized = false;
37 
49  public function initLB( LoadBalancer $lb ) {
50  if ( $lb->getServerCount() <= 1 ) {
51  return; // non-replicated setup
52  }
53  if ( !$this->initialized ) {
54  $this->initialized = true;
55  if ( isset( $_SESSION[__CLASS__] ) && is_array( $_SESSION[__CLASS__] ) ) {
56  $this->startupPositions = $_SESSION[__CLASS__];
57  }
58  }
59  $masterName = $lb->getServerName( 0 );
60  if ( !empty( $this->startupPositions[$masterName] ) ) {
61  $info = $lb->parentInfo();
62  $pos = $this->startupPositions[$masterName];
63  wfDebug( __METHOD__ . ": LB " . $info['id'] . " waiting for master pos $pos\n" );
64  $lb->waitFor( $pos );
65  }
66  }
67 
75  public function shutdownLB( LoadBalancer $lb ) {
76  if ( session_id() == '' || $lb->getServerCount() <= 1 ) {
77  return; // don't start a session; don't bother with non-replicated setups
78  }
79  $masterName = $lb->getServerName( 0 );
80  if ( isset( $this->shutdownPositions[$masterName] ) ) {
81  return; // already done
82  }
83  // Only save the position if writes have been done on the connection
84  $db = $lb->getAnyOpenConnection( 0 );
85  $info = $lb->parentInfo();
86  if ( !$db || !$db->doneWrites() ) {
87  wfDebug( __METHOD__ . ": LB {$info['id']}, no writes done\n" );
88 
89  return;
90  }
91  $pos = $db->getMasterPos();
92  wfDebug( __METHOD__ . ": LB {$info['id']} has master pos $pos\n" );
93  $this->shutdownPositions[$masterName] = $pos;
94  }
95 
102  public function shutdown() {
103  if ( session_id() != '' && count( $this->shutdownPositions ) ) {
104  wfDebug( __METHOD__ . ": saving master pos for " .
105  count( $this->shutdownPositions ) . " master(s)\n" );
106  $_SESSION[__CLASS__] = $this->shutdownPositions;
107  }
108  }
109 }
php
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Definition: skin.txt:62
ChronologyProtector\$startupPositions
array $startupPositions
(DB master name => position) *
Definition: ChronologyProtector.php:29
ChronologyProtector
Class for ensuring a consistent ordering of events as seen by the user, despite replication.
Definition: ChronologyProtector.php:28
$lb
if( $wgAPIRequestLog) $lb
Definition: api.php:126
ChronologyProtector\initLB
initLB(LoadBalancer $lb)
Initialise a LoadBalancer to give it appropriate chronology protection.
Definition: ChronologyProtector.php:46
array
the array() calling protocol came about after MediaWiki 1.4rc1.
List of Api Query prop modules.
LoadBalancer
Database load balancing object.
Definition: LoadBalancer.php:30
wfDebug
wfDebug( $text, $dest='all')
Sends a line to the debug log if enabled or, optionally, to a comment in output.
Definition: GlobalFunctions.php:933
ChronologyProtector\$shutdownPositions
array $shutdownPositions
(DB master name => position) *
Definition: ChronologyProtector.php:31
ChronologyProtector\shutdownLB
shutdownLB(LoadBalancer $lb)
Notify the ChronologyProtector that the LoadBalancer is about to shut down.
Definition: ChronologyProtector.php:72
ChronologyProtector\$initialized
bool $initialized
Whether the session data was loaded *.
Definition: ChronologyProtector.php:33
ChronologyProtector\shutdown
shutdown()
Notify the ChronologyProtector that the LBFactory is done calling shutdownLB() for now.
Definition: ChronologyProtector.php:99