5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
21 * @author Aaron Schulz
25 * Class to handle enqueueing of background jobs
32 protected static $instances = array();
34 protected $wiki; // string; wiki ID
36 const TYPE_DEFAULT
= 1; // integer; job not in $wgJobTypesExcludedFromDefaultQueue
37 const TYPE_ANY
= 2; // integer; any job
40 * @param $wiki string Wiki ID
42 protected function __construct( $wiki ) {
47 * @param $wiki string Wiki ID
48 * @return JobQueueGroup
50 public static function singleton( $wiki = false ) {
51 $wiki = ( $wiki === false ) ?
wfWikiID() : $wiki;
52 if ( !isset( self
::$instances[$wiki] ) ) {
53 self
::$instances[$wiki] = new self( $wiki );
55 return self
::$instances[$wiki];
60 * @return JobQueue Job queue object for a given queue type
62 public function get( $type ) {
63 global $wgJobTypeConf;
65 $conf = array( 'wiki' => $this->wiki
, 'type' => $type );
66 if ( isset( $wgJobTypeConf[$type] ) ) {
67 $conf = $conf +
$wgJobTypeConf[$type];
69 $conf = $conf +
$wgJobTypeConf['default'];
72 return JobQueue
::factory( $conf );
76 * Insert jobs into the respective queues of with the belong
78 * @param $jobs Job|array A single Job or a list of Jobs
81 public function push( $jobs ) {
82 $jobs = is_array( $jobs ) ?
$jobs : array( $jobs );
84 $jobsByType = array(); // (job type => list of jobs)
85 foreach ( $jobs as $job ) {
86 if ( $job instanceof Job
) {
87 $jobsByType[$job->getType()][] = $job;
89 throw new MWException( "Attempted to push a non-Job object into a queue." );
94 foreach ( $jobsByType as $type => $jobs ) {
95 if ( !$this->get( $type )->batchPush( $jobs ) ) {
104 * Pop a job off one of the job queues
106 * @param $type integer JobQueueGroup::TYPE_* constant
107 * @return Job|bool Returns false on failure
109 public function pop( $type = self
::TYPE_DEFAULT
) {
110 $types = ( $type == self
::TYPE_DEFAULT
)
111 ?
$this->getDefaultQueueTypes()
112 : $this->getQueueTypes();
113 shuffle( $types ); // avoid starvation
115 foreach ( $types as $type ) { // for each queue...
116 $job = $this->get( $type )->pop();
118 return $job; // found
122 return false; // no jobs found
126 * Acknowledge that a job was completed
131 public function ack( Job
$job ) {
132 return $this->get( $job->getType() )->ack( $job );
136 * Get the list of queue types
138 * @return array List of strings
140 public function getQueueTypes() {
141 global $wgJobClasses;
143 return array_keys( $wgJobClasses );
147 * Get the list of default queue types
149 * @return array List of strings
151 public function getDefaultQueueTypes() {
152 global $wgJobTypesExcludedFromDefaultQueue;
154 return array_diff( $this->getQueueTypes(), $wgJobTypesExcludedFromDefaultQueue );