includes/WatchedItemStore.php

   1 <?php
   2
   3 use Wikimedia\Assert\Assert;
   4
   5 /**
   6  * Storage layer class for WatchedItems.
   7  * Database interaction.
   8  *
   9  * @author Addshore
  10  *
  11  * @since 1.27
  12  */
  13 class WatchedItemStore {
  14
  15         /**
  16          * @var LoadBalancer
  17          */
  18         private $loadBalancer;
  19
  20         /**
  21          * @var HashBagOStuff
  22          */
  23         private $cache;
  24
  25         /**
  26          * @var array[] Looks like $cacheIndex[Namespace ID][Target DB Key][User Id] => 'key'
  27          * The index is needed so that on mass changes all relevant items can be un-cached.
  28          * For example: Clearing a users watchlist of all items or updating notification timestamps
  29          *              for all users watching a single target.
  30          */
  31         private $cacheIndex = [];
  32
  33         /**
  34          * @var callable|null
  35          */
  36         private $deferredUpdatesAddCallableUpdateCallback;
  37
  38         /**
  39          * @var callable|null
  40          */
  41         private $revisionGetTimestampFromIdCallback;
  42
  43         /**
  44          * @var self|null
  45          */
  46         private static $instance;
  47
  48         /**
  49          * @param LoadBalancer $loadBalancer
  50          * @param HashBagOStuff $cache
  51          */
  52         public function __construct(
  53                 LoadBalancer $loadBalancer,
  54                 HashBagOStuff $cache
  55         ) {
  56                 $this->loadBalancer = $loadBalancer;
  57                 $this->cache = $cache;
  58                 $this->deferredUpdatesAddCallableUpdateCallback = [ 'DeferredUpdates', 'addCallableUpdate' ];
  59                 $this->revisionGetTimestampFromIdCallback = [ 'Revision', 'getTimestampFromId' ];
  60         }
  61
  62         /**
  63          * Overrides the DeferredUpdates::addCallableUpdate callback
  64          * This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
  65          *
  66          * @param callable $callback
  67          * @see DeferredUpdates::addCallableUpdate for callback signiture
  68          *
  69          * @throws MWException
  70          */
  71         public function overrideDeferredUpdatesAddCallableUpdateCallback( $callback ) {
  72                 if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
  73                         throw new MWException(
  74                                 'Cannot override DeferredUpdates::addCallableUpdate callback in operation.'
  75                         );
  76                 }
  77                 Assert::parameterType( 'callable', $callback, '$callback' );
  78                 $this->deferredUpdatesAddCallableUpdateCallback = $callback;
  79         }
  80
  81         /**
  82          * Overrides the Revision::getTimestampFromId callback
  83          * This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
  84          *
  85          * @param callable $callback
  86          * @see Revision::getTimestampFromId for callback signiture
  87          *
  88          * @throws MWException
  89          */
  90         public function overrideRevisionGetTimestampFromIdCallback( $callback ) {
  91                 if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
  92                         throw new MWException(
  93                                 'Cannot override Revision::getTimestampFromId callback in operation.'
  94                         );
  95                 }
  96                 Assert::parameterType( 'callable', $callback, '$callback' );
  97                 $this->revisionGetTimestampFromIdCallback = $callback;
  98         }
  99
 100         /**
 101          * Overrides the default instance of this class
 102          * This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
 103          *
 104          * @param WatchedItemStore $store
 105          *
 106          * @throws MWException
 107          */
 108         public static function overrideDefaultInstance( WatchedItemStore $store ) {
 109                 if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
 110                         throw new MWException(
 111                                 'Cannot override ' . __CLASS__ . 'default instance in operation.'
 112                         );
 113                 }
 114                 self::$instance = $store;
 115         }
 116
 117         /**
 118          * @return self
 119          */
 120         public static function getDefaultInstance() {
 121                 if ( !self::$instance ) {
 122                         self::$instance = new self(
 123                                 wfGetLB(),
 124                                 new HashBagOStuff( [ 'maxKeys' => 100 ] )
 125                         );
 126                 }
 127                 return self::$instance;
 128         }
 129
 130         private function getCacheKey( User $user, LinkTarget $target ) {
 131                 return $this->cache->makeKey(
 132                         (string)$target->getNamespace(),
 133                         $target->getDBkey(),
 134                         (string)$user->getId()
 135                 );
 136         }
 137
 138         private function cache( WatchedItem $item ) {
 139                 $user = $item->getUser();
 140                 $target = $item->getLinkTarget();
 141                 $key = $this->getCacheKey( $user, $target );
 142                 $this->cache->set( $key, $item );
 143                 $this->cacheIndex[$target->getNamespace()][$target->getDBkey()][$user->getId()] = $key;
 144         }
 145
 146         private function uncache( User $user, LinkTarget $target ) {
 147                 $this->cache->delete( $this->getCacheKey( $user, $target ) );
 148                 unset( $this->cacheIndex[$target->getNamespace()][$target->getDBkey()][$user->getId()] );
 149         }
 150
 151         private function uncacheLinkTarget( LinkTarget $target ) {
 152                 if ( !isset( $this->cacheIndex[$target->getNamespace()][$target->getDBkey()] ) ) {
 153                         return;
 154                 }
 155                 foreach ( $this->cacheIndex[$target->getNamespace()][$target->getDBkey()] as $key ) {
 156                         $this->cache->delete( $key );
 157                 }
 158         }
 159
 160         /**
 161          * @param User $user
 162          * @param LinkTarget $target
 163          *
 164          * @return WatchedItem|null
 165          */
 166         private function getCached( User $user, LinkTarget $target ) {
 167                 return $this->cache->get( $this->getCacheKey( $user, $target ) );
 168         }
 169
 170         /**
 171          * Return an array of conditions to select or update the appropriate database
 172          * row.
 173          *
 174          * @param User $user
 175          * @param LinkTarget $target
 176          *
 177          * @return array
 178          */
 179         private function dbCond( User $user, LinkTarget $target ) {
 180                 return [
 181                         'wl_user' => $user->getId(),
 182                         'wl_namespace' => $target->getNamespace(),
 183                         'wl_title' => $target->getDBkey(),
 184                 ];
 185         }
 186
 187         /**
 188          * @param LinkTarget $target
 189          *
 190          * @return int
 191          */
 192         public function countWatchers( LinkTarget $target ) {
 193                 $dbr = $this->loadBalancer->getConnection( DB_SLAVE, [ 'watchlist' ] );
 194                 $return = (int)$dbr->selectField(
 195                         'watchlist',
 196                         'COUNT(*)',
 197                         [
 198                                 'wl_namespace' => $target->getNamespace(),
 199                                 'wl_title' => $target->getDBkey(),
 200                         ],
 201                         __METHOD__
 202                 );
 203                 $this->loadBalancer->reuseConnection( $dbr );
 204
 205                 return $return;
 206         }
 207
 208         /**
 209          * Number of page watchers who also visited a "recent" edit
 210          *
 211          * @param LinkTarget $target
 212          * @param mixed $threshold timestamp accepted by wfTimestamp
 213          *
 214          * @return int
 215          * @throws DBUnexpectedError
 216          * @throws MWException
 217          */
 218         public function countVisitingWatchers( LinkTarget $target, $threshold ) {
 219                 $dbr = $this->loadBalancer->getConnection( DB_SLAVE, [ 'watchlist' ] );
 220                 $visitingWatchers = (int)$dbr->selectField(
 221                         'watchlist',
 222                         'COUNT(*)',
 223                         [
 224                                 'wl_namespace' => $target->getNamespace(),
 225                                 'wl_title' => $target->getDBkey(),
 226                                 'wl_notificationtimestamp >= ' .
 227                                 $dbr->addQuotes( $dbr->timestamp( $threshold ) ) .
 228                                 ' OR wl_notificationtimestamp IS NULL'
 229                         ],
 230                         __METHOD__
 231                 );
 232                 $this->loadBalancer->reuseConnection( $dbr );
 233
 234                 return $visitingWatchers;
 235         }
 236
 237         /**
 238          * @param LinkTarget[] $targets
 239          * @param array $options Allowed keys:
 240          *        'minimumWatchers' => int
 241          *
 242          * @return array multi dimensional like $return[$namespaceId][$titleString] = int $watchers
 243          *         All targets will be present in the result. 0 either means no watchers or the number
 244          *         of watchers was below the minimumWatchers option if passed.
 245          */
 246         public function countWatchersMultiple( array $targets, array $options = [] ) {
 247                 $dbOptions = [ 'GROUP BY' => [ 'wl_namespace', 'wl_title' ] ];
 248
 249                 $dbr = $this->loadBalancer->getConnection( DB_SLAVE, [ 'watchlist' ] );
 250
 251                 if ( array_key_exists( 'minimumWatchers', $options ) ) {
 252                         $dbOptions['HAVING'] = 'COUNT(*) >= ' . (int)$options['minimumWatchers'];
 253                 }
 254
 255                 $lb = new LinkBatch( $targets );
 256                 $res = $dbr->select(
 257                         'watchlist',
 258                         [ 'wl_title', 'wl_namespace', 'watchers' => 'COUNT(*)' ],
 259                         [ $lb->constructSet( 'wl', $dbr ) ],
 260                         __METHOD__,
 261                         $dbOptions
 262                 );
 263
 264                 $this->loadBalancer->reuseConnection( $dbr );
 265
 266                 $watchCounts = [];
 267                 foreach ( $targets as $linkTarget ) {
 268                         $watchCounts[$linkTarget->getNamespace()][$linkTarget->getDBkey()] = 0;
 269                 }
 270
 271                 foreach ( $res as $row ) {
 272                         $watchCounts[$row->wl_namespace][$row->wl_title] = (int)$row->watchers;
 273                 }
 274
 275                 return $watchCounts;
 276         }
 277
 278         /**
 279          * Get an item (may be cached)
 280          *
 281          * @param User $user
 282          * @param LinkTarget $target
 283          *
 284          * @return WatchedItem|false
 285          */
 286         public function getWatchedItem( User $user, LinkTarget $target ) {
 287                 if ( $user->isAnon() ) {
 288                         return false;
 289                 }
 290
 291                 $cached = $this->getCached( $user, $target );
 292                 if ( $cached ) {
 293                         return $cached;
 294                 }
 295                 return $this->loadWatchedItem( $user, $target );
 296         }
 297
 298         /**
 299          * Loads an item from the db
 300          *
 301          * @param User $user
 302          * @param LinkTarget $target
 303          *
 304          * @return WatchedItem|false
 305          */
 306         public function loadWatchedItem( User $user, LinkTarget $target ) {
 307                 // Only loggedin user can have a watchlist
 308                 if ( $user->isAnon() ) {
 309                         return false;
 310                 }
 311
 312                 $dbr = $this->loadBalancer->getConnection( DB_SLAVE, [ 'watchlist' ] );
 313                 $row = $dbr->selectRow(
 314                         'watchlist',
 315                         'wl_notificationtimestamp',
 316                         $this->dbCond( $user, $target ),
 317                         __METHOD__
 318                 );
 319                 $this->loadBalancer->reuseConnection( $dbr );
 320
 321                 if ( !$row ) {
 322                         return false;
 323                 }
 324
 325                 $item = new WatchedItem(
 326                         $user,
 327                         $target,
 328                         $row->wl_notificationtimestamp
 329                 );
 330                 $this->cache( $item );
 331
 332                 return $item;
 333         }
 334
 335         /**
 336          * Must be called separately for Subject & Talk namespaces
 337          *
 338          * @param User $user
 339          * @param LinkTarget $target
 340          *
 341          * @return bool
 342          */
 343         public function isWatched( User $user, LinkTarget $target ) {
 344                 return (bool)$this->getWatchedItem( $user, $target );
 345         }
 346
 347         /**
 348          * Must be called separately for Subject & Talk namespaces
 349          *
 350          * @param User $user
 351          * @param LinkTarget $target
 352          */
 353         public function addWatch( User $user, LinkTarget $target ) {
 354                 $this->addWatchBatch( [ [ $user, $target ] ] );
 355         }
 356
 357         /**
 358          * @param array[] $userTargetCombinations array of arrays containing [0] => User [1] => LinkTarget
 359          *
 360          * @return bool success
 361          */
 362         public function addWatchBatch( array $userTargetCombinations ) {
 363                 if ( $this->loadBalancer->getReadOnlyReason() !== false ) {
 364                         return false;
 365                 }
 366
 367                 $rows = [];
 368                 foreach ( $userTargetCombinations as list( $user, $target ) ) {
 369                         /**
 370                          * @var User $user
 371                          * @var LinkTarget $target
 372                          */
 373
 374                         // Only loggedin user can have a watchlist
 375                         if ( $user->isAnon() ) {
 376                                 continue;
 377                         }
 378                         $rows[] = [
 379                                 'wl_user' => $user->getId(),
 380                                 'wl_namespace' => $target->getNamespace(),
 381                                 'wl_title' => $target->getDBkey(),
 382                                 'wl_notificationtimestamp' => null,
 383                         ];
 384                         $this->uncache( $user, $target );
 385                 }
 386
 387                 if ( !$rows ) {
 388                         return false;
 389                 }
 390
 391                 $dbw = $this->loadBalancer->getConnection( DB_MASTER, [ 'watchlist' ] );
 392                 foreach ( array_chunk( $rows, 100 ) as $toInsert ) {
 393                         // Use INSERT IGNORE to avoid overwriting the notification timestamp
 394                         // if there's already an entry for this page
 395                         $dbw->insert( 'watchlist', $toInsert, __METHOD__, 'IGNORE' );
 396                 }
 397                 $this->loadBalancer->reuseConnection( $dbw );
 398
 399                 return true;
 400         }
 401
 402         /**
 403          * Removes the an entry for the User watching the LinkTarget
 404          * Must be called separately for Subject & Talk namespaces
 405          *
 406          * @param User $user
 407          * @param LinkTarget $target
 408          *
 409          * @return bool success
 410          * @throws DBUnexpectedError
 411          * @throws MWException
 412          */
 413         public function removeWatch( User $user, LinkTarget $target ) {
 414                 // Only logged in user can have a watchlist
 415                 if ( $this->loadBalancer->getReadOnlyReason() !== false || $user->isAnon() ) {
 416                         return false;
 417                 }
 418
 419                 $this->uncache( $user, $target );
 420
 421                 $dbw = $this->loadBalancer->getConnection( DB_MASTER, [ 'watchlist' ] );
 422                 $dbw->delete( 'watchlist',
 423                         [
 424                                 'wl_user' => $user->getId(),
 425                                 'wl_namespace' => $target->getNamespace(),
 426                                 'wl_title' => $target->getDBkey(),
 427                         ], __METHOD__
 428                 );
 429                 $success = (bool)$dbw->affectedRows();
 430                 $this->loadBalancer->reuseConnection( $dbw );
 431
 432                 return $success;
 433         }
 434
 435         /**
 436          * @param User $editor The editor that triggered the update. Their notification
 437          *  timestamp will not be updated(they have already seen it)
 438          * @param LinkTarget $target The target to update timestamps for
 439          * @param string $timestamp Set the update timestamp to this value
 440          *
 441          * @return int[] Array of user IDs the timestamp has been updated for
 442          */
 443         public function updateNotificationTimestamp( User $editor, LinkTarget $target, $timestamp ) {
 444                 $dbw = $this->loadBalancer->getConnection( DB_MASTER, [ 'watchlist' ] );
 445                 $res = $dbw->select( [ 'watchlist' ],
 446                         [ 'wl_user' ],
 447                         [
 448                                 'wl_user != ' . intval( $editor->getId() ),
 449                                 'wl_namespace' => $target->getNamespace(),
 450                                 'wl_title' => $target->getDBkey(),
 451                                 'wl_notificationtimestamp IS NULL',
 452                         ], __METHOD__
 453                 );
 454
 455                 $watchers = [];
 456                 foreach ( $res as $row ) {
 457                         $watchers[] = intval( $row->wl_user );
 458                 }
 459
 460                 if ( $watchers ) {
 461                         // Update wl_notificationtimestamp for all watching users except the editor
 462                         $fname = __METHOD__;
 463                         $dbw->onTransactionIdle(
 464                                 function () use ( $dbw, $timestamp, $watchers, $target, $fname ) {
 465                                         $dbw->update( 'watchlist',
 466                                                 [ /* SET */
 467                                                         'wl_notificationtimestamp' => $dbw->timestamp( $timestamp )
 468                                                 ], [ /* WHERE */
 469                                                         'wl_user' => $watchers,
 470                                                         'wl_namespace' => $target->getNamespace(),
 471                                                         'wl_title' => $target->getDBkey(),
 472                                                 ], $fname
 473                                         );
 474                                         $this->uncacheLinkTarget( $target );
 475                                 }
 476                         );
 477                 }
 478
 479                 $this->loadBalancer->reuseConnection( $dbw );
 480
 481                 return $watchers;
 482         }
 483
 484         /**
 485          * Reset the notification timestamp of this entry
 486          *
 487          * @param User $user
 488          * @param Title $title
 489          * @param string $force Whether to force the write query to be executed even if the
 490          *    page is not watched or the notification timestamp is already NULL.
 491          *    'force' in order to force
 492          * @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
 493          *
 494          * @return bool success
 495          */
 496         public function resetNotificationTimestamp( User $user, Title $title, $force = '', $oldid = 0 ) {
 497                 // Only loggedin user can have a watchlist
 498                 if ( $this->loadBalancer->getReadOnlyReason() !== false || $user->isAnon() ) {
 499                         return false;
 500                 }
 501
 502                 $item = null;
 503                 if ( $force != 'force' ) {
 504                         $item = $this->loadWatchedItem( $user, $title );
 505                         if ( !$item || $item->getNotificationTimestamp() === null ) {
 506                                 return false;
 507                         }
 508                 }
 509
 510                 // If the page is watched by the user (or may be watched), update the timestamp
 511                 $job = new ActivityUpdateJob(
 512                         $title,
 513                         [
 514                                 'type'      => 'updateWatchlistNotification',
 515                                 'userid'    => $user->getId(),
 516                                 'notifTime' => $this->getNotificationTimestamp( $user, $title, $item, $force, $oldid ),
 517                                 'curTime'   => time()
 518                         ]
 519                 );
 520
 521                 // Try to run this post-send
 522                 // Calls DeferredUpdates::addCallableUpdate in normal operation
 523                 call_user_func(
 524                         $this->deferredUpdatesAddCallableUpdateCallback,
 525                         function() use ( $job ) {
 526                                 $job->run();
 527                         }
 528                 );
 529
 530                 $this->uncache( $user, $title );
 531
 532                 return true;
 533         }
 534
 535         private function getNotificationTimestamp( User $user, Title $title, $item, $force, $oldid ) {
 536                 if ( !$oldid ) {
 537                         // No oldid given, assuming latest revision; clear the timestamp.
 538                         return null;
 539                 }
 540
 541                 if ( !$title->getNextRevisionID( $oldid ) ) {
 542                         // Oldid given and is the latest revision for this title; clear the timestamp.
 543                         return null;
 544                 }
 545
 546                 if ( $item === null ) {
 547                         $item = $this->loadWatchedItem( $user, $title );
 548                 }
 549
 550                 if ( !$item ) {
 551                         // This can only happen if $force is enabled.
 552                         return null;
 553                 }
 554
 555                 // Oldid given and isn't the latest; update the timestamp.
 556                 // This will result in no further notification emails being sent!
 557                 // Calls Revision::getTimestampFromId in normal operation
 558                 $notificationTimestamp = call_user_func(
 559                         $this->revisionGetTimestampFromIdCallback,
 560                         $title,
 561                         $oldid
 562                 );
 563
 564                 // We need to go one second to the future because of various strict comparisons
 565                 // throughout the codebase
 566                 $ts = new MWTimestamp( $notificationTimestamp );
 567                 $ts->timestamp->add( new DateInterval( 'PT1S' ) );
 568                 $notificationTimestamp = $ts->getTimestamp( TS_MW );
 569
 570                 if ( $notificationTimestamp < $item->getNotificationTimestamp() ) {
 571                         if ( $force != 'force' ) {
 572                                 return false;
 573                         } else {
 574                                 // This is a little silly…
 575                                 return $item->getNotificationTimestamp();
 576                         }
 577                 }
 578
 579                 return $notificationTimestamp;
 580         }
 581
 582         /**
 583          * @param User $user
 584          * @param int $unreadLimit
 585          *
 586          * @return int|bool The number of unread notifications
 587          *                  true if greater than or equal to $unreadLimit
 588          */
 589         public function countUnreadNotifications( User $user, $unreadLimit = null ) {
 590                 $queryOptions = [];
 591                 if ( $unreadLimit !== null ) {
 592                         $unreadLimit = (int)$unreadLimit;
 593                         $queryOptions['LIMIT'] = $unreadLimit;
 594                 }
 595
 596                 $dbr = $this->loadBalancer->getConnection( DB_SLAVE, [ 'watchlist' ] );
 597                 $rowCount = $dbr->selectRowCount(
 598                         'watchlist',
 599                         '1',
 600                         [
 601                                 'wl_user' => $user->getId(),
 602                                 'wl_notificationtimestamp IS NOT NULL',
 603                         ],
 604                         __METHOD__,
 605                         $queryOptions
 606                 );
 607                 $this->loadBalancer->reuseConnection( $dbr );
 608
 609                 if ( !isset( $unreadLimit ) ) {
 610                         return $rowCount;
 611                 }
 612
 613                 if ( $rowCount >= $unreadLimit ) {
 614                         return true;
 615                 }
 616
 617                 return $rowCount;
 618         }
 619
 620         /**
 621          * Check if the given title already is watched by the user, and if so
 622          * add a watch for the new title.
 623          *
 624          * To be used for page renames and such.
 625          *
 626          * @param LinkTarget $oldTarget
 627          * @param LinkTarget $newTarget
 628          */
 629         public function duplicateAllAssociatedEntries( LinkTarget $oldTarget, LinkTarget $newTarget ) {
 630                 if ( !$oldTarget instanceof Title ) {
 631                         $oldTarget = Title::newFromLinkTarget( $oldTarget );
 632                 }
 633                 if ( !$newTarget instanceof Title ) {
 634                         $newTarget = Title::newFromLinkTarget( $newTarget );
 635                 }
 636
 637                 $this->duplicateEntry( $oldTarget->getSubjectPage(), $newTarget->getSubjectPage() );
 638                 $this->duplicateEntry( $oldTarget->getTalkPage(), $newTarget->getTalkPage() );
 639         }
 640
 641         /**
 642          * Check if the given title already is watched by the user, and if so
 643          * add a watch for the new title.
 644          *
 645          * To be used for page renames and such.
 646          * This must be called separately for Subject and Talk pages
 647          *
 648          * @param LinkTarget $oldTarget
 649          * @param LinkTarget $newTarget
 650          */
 651         public function duplicateEntry( LinkTarget $oldTarget, LinkTarget $newTarget ) {
 652                 $dbw = $this->loadBalancer->getConnection( DB_MASTER, [ 'watchlist' ] );
 653
 654                 $result = $dbw->select(
 655                         'watchlist',
 656                         [ 'wl_user', 'wl_notificationtimestamp' ],
 657                         [
 658                                 'wl_namespace' => $oldTarget->getNamespace(),
 659                                 'wl_title' => $oldTarget->getDBkey(),
 660                         ],
 661                         __METHOD__,
 662                         [ 'FOR UPDATE' ]
 663                 );
 664
 665                 $newNamespace = $newTarget->getNamespace();
 666                 $newDBkey = $newTarget->getDBkey();
 667
 668                 # Construct array to replace into the watchlist
 669                 $values = [];
 670                 foreach ( $result as $row ) {
 671                         $values[] = [
 672                                 'wl_user' => $row->wl_user,
 673                                 'wl_namespace' => $newNamespace,
 674                                 'wl_title' => $newDBkey,
 675                                 'wl_notificationtimestamp' => $row->wl_notificationtimestamp,
 676                         ];
 677                 }
 678
 679                 if ( !empty( $values ) ) {
 680                         # Perform replace
 681                         # Note that multi-row replace is very efficient for MySQL but may be inefficient for
 682                         # some other DBMSes, mostly due to poor simulation by us
 683                         $dbw->replace(
 684                                 'watchlist',
 685                                 [ [ 'wl_user', 'wl_namespace', 'wl_title' ] ],
 686                                 $values,
 687                                 __METHOD__
 688                         );
 689                 }
 690
 691                 $this->loadBalancer->reuseConnection( $dbw );
 692         }
 693
 694 }