PHP Revision::newKnownCurrent方法代码示例

 /**
  * Wrapper around Revision::newFromTitle to allow passing additional parameters
  * without passing them on to it.
  *
  * @since 1.24
  * @param Title $title
  * @param Parser|bool $parser
  * @return Revision|bool False if missing
  */
 public static function statelessFetchRevision(Title $title, $parser = false)
 {
     $pageId = $title->getArticleID();
     $revId = $title->getLatestRevID();
     $rev = Revision::newKnownCurrent(wfGetDB(DB_REPLICA), $pageId, $revId);
     if ($rev) {
         $rev->setTitle($title);
     }
     return $rev;
 }

 /**
  * Loads everything except the text
  * This isn't necessary for all uses, so it's only done if needed.
  */
 protected function loadLastEdit()
 {
     if ($this->mLastRevision !== null) {
         return;
         // already loaded
     }
     $latest = $this->getLatest();
     if (!$latest) {
         return;
         // page doesn't exist or is missing page_latest info
     }
     if ($this->mDataLoadedFrom == self::READ_LOCKING) {
         // Bug 37225: if session S1 loads the page row FOR UPDATE, the result always
         // includes the latest changes committed. This is true even within REPEATABLE-READ
         // transactions, where S1 normally only sees changes committed before the first S1
         // SELECT. Thus we need S1 to also gets the revision row FOR UPDATE; otherwise, it
         // may not find it since a page row UPDATE and revision row INSERT by S2 may have
         // happened after the first S1 SELECT.
         // http://dev.mysql.com/doc/refman/5.0/en/set-transaction.html#isolevel_repeatable-read
         $flags = Revision::READ_LOCKING;
         $revision = Revision::newFromPageId($this->getId(), $latest, $flags);
     } elseif ($this->mDataLoadedFrom == self::READ_LATEST) {
         // Bug T93976: if page_latest was loaded from the master, fetch the
         // revision from there as well, as it may not exist yet on a replica DB.
         // Also, this keeps the queries in the same REPEATABLE-READ snapshot.
         $flags = Revision::READ_LATEST;
         $revision = Revision::newFromPageId($this->getId(), $latest, $flags);
     } else {
         $dbr = wfGetDB(DB_REPLICA);
         $revision = Revision::newKnownCurrent($dbr, $this->getId(), $latest);
     }
     if ($revision) {
         // sanity
         $this->setLastEdit($revision);
     }
 }

 /**
  * Get a message from the MediaWiki namespace, with caching. The key must
  * first be converted to two-part lang/msg form if necessary.
  *
  * Unlike self::get(), this function doesn't resolve fallback chains, and
  * some callers require this behavior. LanguageConverter::parseCachedTable()
  * and self::get() are some examples in core.
  *
  * @param string $title Message cache key with initial uppercase letter.
  * @param string $code Code denoting the language to try.
  * @return string|bool The message, or false if it does not exist or on error
  */
 public function getMsgFromNamespace($title, $code)
 {
     $this->load($code);
     if (isset($this->mCache[$code][$title])) {
         $entry = $this->mCache[$code][$title];
         if (substr($entry, 0, 1) === ' ') {
             // The message exists, so make sure a string
             // is returned.
             return (string) substr($entry, 1);
         } elseif ($entry === '!NONEXISTENT') {
             return false;
         } elseif ($entry === '!TOO BIG') {
             // Fall through and try invididual message cache below
         }
     } else {
         // XXX: This is not cached in process cache, should it?
         $message = false;
         Hooks::run('MessagesPreLoad', [$title, &$message]);
         if ($message !== false) {
             return $message;
         }
         return false;
     }
     // Try the individual message cache
     $titleKey = wfMemcKey('messages', 'individual', $title);
     $curTTL = null;
     $entry = $this->wanCache->get($titleKey, $curTTL, [wfMemcKey('messages', $code)]);
     $entry = $curTTL >= 0 ? $entry : false;
     if ($entry) {
         if (substr($entry, 0, 1) === ' ') {
             $this->mCache[$code][$title] = $entry;
             // The message exists, so make sure a string is returned
             return (string) substr($entry, 1);
         } elseif ($entry === '!NONEXISTENT') {
             $this->mCache[$code][$title] = '!NONEXISTENT';
             return false;
         } else {
             // Corrupt/obsolete entry, delete it
             $this->wanCache->delete($titleKey);
         }
     }
     // Try loading it from the database
     $dbr = wfGetDB(DB_REPLICA);
     $cacheOpts = Database::getCacheSetOptions($dbr);
     // Use newKnownCurrent() to avoid querying revision/user tables
     $titleObj = Title::makeTitle(NS_MEDIAWIKI, $title);
     if ($titleObj->getLatestRevID()) {
         $revision = Revision::newKnownCurrent($dbr, $titleObj->getArticleID(), $titleObj->getLatestRevID());
     } else {
         $revision = false;
     }
     if ($revision) {
         $content = $revision->getContent();
         if (!$content) {
             // A possibly temporary loading failure.
             wfDebugLog('MessageCache', __METHOD__ . ": failed to load message page text for {$title} ({$code})");
             $message = null;
             // no negative caching
         } else {
             // XXX: Is this the right way to turn a Content object into a message?
             // NOTE: $content is typically either WikitextContent, JavaScriptContent or
             //       CssContent. MessageContent is *not* used for storing messages, it's
             //       only used for wrapping them when needed.
             $message = $content->getWikitextForTransclusion();
             if ($message === false || $message === null) {
                 wfDebugLog('MessageCache', __METHOD__ . ": message content doesn't provide wikitext " . "(content model: " . $content->getModel() . ")");
                 $message = false;
                 // negative caching
             } else {
                 $this->mCache[$code][$title] = ' ' . $message;
                 $this->wanCache->set($titleKey, ' ' . $message, $this->mExpiry, $cacheOpts);
             }
         }
     } else {
         $message = false;
         // negative caching
     }
     if ($message === false) {
         // negative caching
         $this->mCache[$code][$title] = '!NONEXISTENT';
         $this->wanCache->set($titleKey, '!NONEXISTENT', $this->mExpiry, $cacheOpts);
     }
     return $message;
 }