PoolWorkArticleView.php

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<?php
class PoolWorkArticleView extends PoolCounterWork {
    private $page;

    private $cacheKey;

    private $revid;

    private $parserOptions;

    private $content = null;

    private $parserOutput = false;

    private $isDirty = false;

    private $error = false;

    public function __construct( WikiPage $page, ParserOptions $parserOptions,
        $revid, $useParserCache, $content = null
    ) {
        if ( is_string( $content ) ) { // BC: old style call
            $modelId = $page->getRevision()->getContentModel();
            $format = $page->getRevision()->getContentFormat();
            $content = ContentHandler::makeContent( $content, $page->getTitle(), $modelId, $format );
        }

        $this->page = $page;
        $this->revid = $revid;
        $this->cacheable = $useParserCache;
        $this->parserOptions = $parserOptions;
        $this->content = $content;
        $this->cacheKey = ParserCache::singleton()->getKey( $page, $parserOptions );
        $keyPrefix = $this->cacheKey ?: wfMemcKey( 'articleview', 'missingcachekey' );
        parent::__construct( 'ArticleView', $keyPrefix . ':revid:' . $revid );
    }

    public function getParserOutput() {
        return $this->parserOutput;
    }

    public function getIsDirty() {
        return $this->isDirty;
    }

    public function getError() {
        return $this->error;
    }

    public function doWork() {
        global $wgUseFileCache;

        // @todo several of the methods called on $this->page are not declared in Page, but present
        //        in WikiPage and delegated by Article.

        $isCurrent = $this->revid === $this->page->getLatest();

        if ( $this->content !== null ) {
            $content = $this->content;
        } elseif ( $isCurrent ) {
            // XXX: why use RAW audience here, and PUBLIC (default) below?
            $content = $this->page->getContent( Revision::RAW );
        } else {
            $rev = Revision::newFromTitle( $this->page->getTitle(), $this->revid );

            if ( $rev === null ) {
                $content = null;
            } else {
                // XXX: why use PUBLIC audience here (default), and RAW above?
                $content = $rev->getContent();
            }
        }

        if ( $content === null ) {
            return false;
        }

        // Reduce effects of race conditions for slow parses (bug 46014)
        $cacheTime = wfTimestampNow();

        $time = - microtime( true );
        $this->parserOutput = $content->getParserOutput(
            $this->page->getTitle(),
            $this->revid,
            $this->parserOptions
        );
        $time += microtime( true );

        // Timing hack
        if ( $time > 3 ) {
            // TODO: Use Parser's logger (once it has one)
            $logger = MediaWiki\Logger\LoggerFactory::getInstance( 'slow-parse' );
            $logger->info( '{time} {title}', [
                'time' => number_format( $time, 2 ),
                'title' => $this->page->getTitle()->getPrefixedDBkey(),
                'trigger' => 'view',
            ] );
        }

        if ( $this->cacheable && $this->parserOutput->isCacheable() && $isCurrent ) {
            ParserCache::singleton()->save(
                $this->parserOutput, $this->page, $this->parserOptions, $cacheTime, $this->revid );
        }

        // Make sure file cache is not used on uncacheable content.
        // Output that has magic words in it can still use the parser cache
        // (if enabled), though it will generally expire sooner.
        if ( !$this->parserOutput->isCacheable() ) {
            $wgUseFileCache = false;
        }

        if ( $isCurrent ) {
            $this->page->triggerOpportunisticLinksUpdate( $this->parserOutput );
        }

        return true;
    }

    public function getCachedWork() {
        $this->parserOutput = ParserCache::singleton()->get( $this->page, $this->parserOptions );

        if ( $this->parserOutput === false ) {
            wfDebug( __METHOD__ . ": parser cache miss\n" );
            return false;
        } else {
            wfDebug( __METHOD__ . ": parser cache hit\n" );
            return true;
        }
    }

    public function fallback() {
        $this->parserOutput = ParserCache::singleton()->getDirty( $this->page, $this->parserOptions );

        if ( $this->parserOutput === false ) {
            wfDebugLog( 'dirty', 'dirty missing' );
            wfDebug( __METHOD__ . ": no dirty cache\n" );
            return false;
        } else {
            wfDebug( __METHOD__ . ": sending dirty output\n" );
            wfDebugLog( 'dirty', "dirty output {$this->cacheKey}" );
            $this->isDirty = true;
            return true;
        }
    }

    public function error( $status ) {
        $this->error = $status;
        return false;
    }
}