} elseif ( $this->hasOption( 'type' ) ) {
$types = array( $this->getOption( 'type' ) );
} else {
- $types = false;
+ $types = JobQueueGroup::singleton()->getDefaultQueueTypes();
}
+ // Handle any required periodic queue maintenance
+ $this->executeReadyPeriodicTasks();
+
$memcKey = 'jobqueue:dbs:v3';
$pendingDbInfo = $wgMemc->get( $memcKey );
do {
$again = false;
- if ( $types === false ) {
- $candidates = call_user_func_array( 'array_merge', $pendingDBs );
- } else {
- $candidates = array();
- $possTypes = array_intersect( $types, array_keys( $pendingDBs ) );
- if ( $possTypes ) {
- $possTypes = array_values( $possTypes );
- $type = $possTypes[ mt_rand( 0, count( $possTypes ) - 1 ) ];
- $candidates = $pendingDBs[$type];
+ $candidates = array(); // list of (type, db)
+ // Flatten the tree of candidates into a flat list so that a random
+ // item can be selected, weighing each queue (type/db tuple) equally.
+ foreach ( $pendingDBs as $type => $dbs ) {
+ if ( in_array( $type, $types ) ) {
+ foreach ( $dbs as $db ) {
+ $candidates[] = array( $type, $db );
+ }
}
}
- if ( !$candidates ) {
+ if ( !count( $candidates ) ) {
return; // no jobs for this type
}
- $candidates = array_values( $candidates );
- $db = $candidates[ mt_rand( 0, count( $candidates ) - 1 ) ];
- if ( !$this->checkJob( $type, $db ) ) {
+ list( $type, $db ) = $candidates[ mt_rand( 0, count( $candidates ) - 1 ) ];
+ if ( !$this->checkJob( $type, $db ) ) { // queue is actually empty?
$pendingDBs = $this->delistDB( $pendingDBs, $db, $type );
// Update the cache to remove the outdated information.
// Make sure that this does not race (especially with full rebuilds).
}
}
+ /**
+ * Remove a type/DB entry from the list of queues with jobs
+ *
+ * @param $pendingDBs array
+ * @param $db string
+ * @param $type string
+ * @return Array
+ */
private function delistDB( array $pendingDBs, $db, $type ) {
- if ( $type === false ) {
- // There are no jobs available in the current database
- foreach ( $pendingDBs as $type2 => $dbs ) {
- $pendingDBs[$type2] = array_diff( $pendingDBs[$type2], array( $db ) );
- }
- } else {
- // There are no jobs of this type available in the current database
- $pendingDBs[$type] = array_diff( $pendingDBs[$type], array( $db ) );
- }
+ $pendingDBs[$type] = array_diff( $pendingDBs[$type], array( $db ) );
return $pendingDBs;
}
* @return bool
*/
private function checkJob( $type, $dbName ) {
- $group = JobQueueGroup::singleton( $dbName );
- if ( $type === false ) {
- foreach ( $group->getDefaultQueueTypes() as $type ) {
- if ( !$group->get( $type )->isEmpty() ) {
- return true;
- }
- }
- return false;
- } else {
- return !$group->get( $type )->isEmpty();
- }
+ return !JobQueueGroup::singleton( $dbName )->get( $type )->isEmpty();
}
/**
$pendingDBs = array(); // (job type => (db list))
foreach ( $wgLocalDatabases as $db ) {
- $types = JobQueueGroup::singleton( $db )->getQueuesWithJobs();
- foreach ( $types as $type ) {
+ foreach ( JobQueueGroup::singleton( $db )->getQueuesWithJobs() as $type ) {
$pendingDBs[$type][] = $db;
}
}
return $pendingDBs;
}
+
+ /**
+ * Do all ready periodic jobs for all databases every 5 minutes (and .1% of the time)
+ * @return integer
+ */
+ private function executeReadyPeriodicTasks() {
+ global $wgLocalDatabases, $wgMemc;
+
+ $count = 0;
+ $memcKey = 'jobqueue:periodic:lasttime';
+ $timestamp = (int)$wgMemc->get( $memcKey ); // UNIX timestamp or 0
+ if ( ( time() - $timestamp ) > 300 || mt_rand( 0, 999 ) == 0 ) { // 5 minutes
+ if ( $wgMemc->add( "$memcKey:rebuild", 1, 1800 ) ) { // lock
+ foreach ( $wgLocalDatabases as $db ) {
+ $count += JobQueueGroup::singleton( $db )->executeReadyPeriodicTasks();
+ }
+ $wgMemc->set( $memcKey, time() );
+ $wgMemc->delete( "$memcKey:rebuild" ); // unlock
+ }
+ }
+
+ return $count;
+ }
}
$maintClass = "nextJobDb";