includes/jobqueue/JobSpecification.php

   1 <?php
   2 /**
   3  * Job queue task description base code.
   4  *
   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.
   9  *
  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.
  14  *
  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
  19  *
  20  * @file
  21  * @ingroup JobQueue
  22  */
  23
  24 /**
  25  * Job queue task description interface
  26  *
  27  * @ingroup JobQueue
  28  * @since 1.23
  29  */
  30 interface IJobSpecification {
  31         /**
  32          * @return string Job type
  33          */
  34         public function getType();
  35
  36         /**
  37          * @return array
  38          */
  39         public function getParams();
  40
  41         /**
  42          * @return int|null UNIX timestamp to delay running this job until, otherwise null
  43          */
  44         public function getReleaseTimestamp();
  45
  46         /**
  47          * @return bool Whether only one of each identical set of jobs should be run
  48          */
  49         public function ignoreDuplicates();
  50
  51         /**
  52          * Subclasses may need to override this to make duplication detection work.
  53          * The resulting map conveys everything that makes the job unique. This is
  54          * only checked if ignoreDuplicates() returns true, meaning that duplicate
  55          * jobs are supposed to be ignored.
  56          *
  57          * @return array Map of key/values
  58          */
  59         public function getDeduplicationInfo();
  60
  61         /**
  62          * @see JobQueue::deduplicateRootJob()
  63          * @return array
  64          * @since 1.26
  65          */
  66         public function getRootJobParams();
  67
  68         /**
  69          * @see JobQueue::deduplicateRootJob()
  70          * @return bool
  71          * @since 1.22
  72          */
  73         public function hasRootJobParams();
  74
  75         /**
  76          * @see JobQueue::deduplicateRootJob()
  77          * @return bool Whether this is job is a root job
  78          */
  79         public function isRootJob();
  80
  81         /**
  82          * @return Title Descriptive title (this can simply be informative)
  83          */
  84         public function getTitle();
  85 }
  86
  87 /**
  88  * Job queue task description base code
  89  *
  90  * Example usage:
  91  * @code
  92  * $job = new JobSpecification(
  93  *              'null',
  94  *              array( 'lives' => 1, 'usleep' => 100, 'pi' => 3.141569 ),
  95  *              array( 'removeDuplicates' => 1 ),
  96  *              Title::makeTitle( NS_SPECIAL, 'nullity' )
  97  * );
  98  * JobQueueGroup::singleton()->push( $job )
  99  * @endcode
 100  *
 101  * @ingroup JobQueue
 102  * @since 1.23
 103  */
 104 class JobSpecification implements IJobSpecification {
 105         /** @var string */
 106         protected $type;
 107
 108         /** @var array Array of job parameters or false if none */
 109         protected $params;
 110
 111         /** @var Title */
 112         protected $title;
 113
 114         /** @var array */
 115         protected $opts;
 116
 117         /**
 118          * @param string $type
 119          * @param array $params Map of key/values
 120          * @param array $opts Map of key/values; includes 'removeDuplicates'
 121          * @param Title $title Optional descriptive title
 122          */
 123         public function __construct(
 124                 $type, array $params, array $opts = array(), Title $title = null
 125         ) {
 126                 $this->validateParams( $params );
 127                 $this->validateParams( $opts );
 128
 129                 $this->type = $type;
 130                 $this->params = $params;
 131                 $this->title = $title ?: Title::makeTitle( NS_SPECIAL, 'Badtitle/' . get_class( $this ) );
 132                 $this->opts = $opts;
 133         }
 134
 135         /**
 136          * @param array $params
 137          */
 138         protected function validateParams( array $params ) {
 139                 foreach ( $params as $p => $v ) {
 140                         if ( is_array( $v ) ) {
 141                                 $this->validateParams( $v );
 142                         } elseif ( !is_scalar( $v ) && $v !== null ) {
 143                                 throw new UnexpectedValueException( "Job parameter $p is not JSON serializable." );
 144                         }
 145                 }
 146         }
 147
 148         public function getType() {
 149                 return $this->type;
 150         }
 151
 152         public function getTitle() {
 153                 return $this->title;
 154         }
 155
 156         public function getParams() {
 157                 return $this->params;
 158         }
 159
 160         public function getReleaseTimestamp() {
 161                 return isset( $this->params['jobReleaseTimestamp'] )
 162                         ? wfTimestampOrNull( TS_UNIX, $this->params['jobReleaseTimestamp'] )
 163                         : null;
 164         }
 165
 166         public function ignoreDuplicates() {
 167                 return !empty( $this->opts['removeDuplicates'] );
 168         }
 169
 170         public function getDeduplicationInfo() {
 171                 $info = array(
 172                         'type' => $this->getType(),
 173                         'namespace' => $this->getTitle()->getNamespace(),
 174                         'title' => $this->getTitle()->getDBkey(),
 175                         'params' => $this->getParams()
 176                 );
 177                 if ( is_array( $info['params'] ) ) {
 178                         // Identical jobs with different "root" jobs should count as duplicates
 179                         unset( $info['params']['rootJobSignature'] );
 180                         unset( $info['params']['rootJobTimestamp'] );
 181                         // Likewise for jobs with different delay times
 182                         unset( $info['params']['jobReleaseTimestamp'] );
 183                 }
 184
 185                 return $info;
 186         }
 187
 188         public function getRootJobParams() {
 189                 return array(
 190                         'rootJobSignature' => isset( $this->params['rootJobSignature'] )
 191                                 ? $this->params['rootJobSignature']
 192                                 : null,
 193                         'rootJobTimestamp' => isset( $this->params['rootJobTimestamp'] )
 194                                 ? $this->params['rootJobTimestamp']
 195                                 : null
 196                 );
 197         }
 198
 199         public function hasRootJobParams() {
 200                 return isset( $this->params['rootJobSignature'] )
 201                         && isset( $this->params['rootJobTimestamp'] );
 202         }
 203
 204         public function isRootJob() {
 205                 return $this->hasRootJobParams() && !empty( $this->params['rootJobIsSelf'] );
 206         }
 207
 208         /**
 209          * @return array Field/value map that can immediately be serialized
 210          * @since 1.25
 211          */
 212         public function toSerializableArray() {
 213                 return array(
 214                         'type'   => $this->type,
 215                         'params' => $this->params,
 216                         'opts'   => $this->opts,
 217                         'title'  => array(
 218                                 'ns'  => $this->title->getNamespace(),
 219                                 'key' => $this->title->getDbKey()
 220                         )
 221                 );
 222         }
 223
 224         /**
 225          * @param array $map Field/value map
 226          * @return JobSpecification
 227          * @since 1.25
 228          */
 229         public static function newFromArray( array $map ) {
 230                 $title = Title::makeTitle( $map['title']['ns'], $map['title']['key'] );
 231
 232                 return new self( $map['type'], $map['params'], $map['opts'], $title );
 233         }
 234 }