HTMLCacheUpdate.php

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<?php
class HTMLCacheUpdate implements DeferrableUpdate {
    public $mTitle;

    public $mTable;

    function __construct( Title $titleTo, $table ) {
        $this->mTitle = $titleTo;
        $this->mTable = $table;
    }

    public function doUpdate() {
        wfProfileIn( __METHOD__ );

        $job = new HTMLCacheUpdateJob(
            $this->mTitle,
            array(
                'table' => $this->mTable,
            ) + Job::newRootJobParams( // "overall" refresh links job info
                "htmlCacheUpdate:{$this->mTable}:{$this->mTitle->getPrefixedText()}"
            )
        );

        $count = $this->mTitle->getBacklinkCache()->getNumLinks( $this->mTable, 100 );
        if ( $count >= 100 ) { // many backlinks
            JobQueueGroup::singleton()->push( $job );
            JobQueueGroup::singleton()->deduplicateRootJob( $job );
        } else { // few backlinks ($count might be off even if 0)
            $dbw = wfGetDB( DB_MASTER );
            $dbw->onTransactionIdle( function () use ( $job ) {
                $job->run(); // just do the purge query now
            } );
        }

        wfProfileOut( __METHOD__ );
    }
}