wikimedia/mediawiki-extensions-DiscussionTools
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Avoid primary DB query for non-talk page edits

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While investigating primary database queries as part of T370304,
we found that EventDispatcher currently issues a primary DB query
to fetch the previous revision of the newly created revision on
every edit, but discards the result for non-talk pages. So, as an
optimization, have it fetch the previous revision only after the page
has been established to be a talk page.

Bug: T370304
Change-Id: I301f5c3c002c6953ef0b3919a33667a809342b84
This commit is contained in:
Máté Szabó 2024-08-14 18:18:02 +02:00
parent 5bf38331de
commit 55665a3f93
1 changed files with 3 additions and 3 deletions
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6
includes/Notifications/EventDispatcher.php
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@ -53,9 +53,6 @@ class EventDispatcher {
public static function generateEventsForRevision( array &$events, RevisionRecord $newRevRecord ): void {
$services = MediaWikiServices::getInstance();
$revisionStore = $services->getRevisionStore();
$oldRevRecord = $revisionStore->getPreviousRevision( $newRevRecord, IDBAccessObject::READ_LATEST );
$title = Title::newFromLinkTarget(
$newRevRecord->getPageAsLinkTarget()
);
@ -71,6 +68,9 @@ class EventDispatcher {
return;
}
$revisionStore = $services->getRevisionStore();
$oldRevRecord = $revisionStore->getPreviousRevision( $newRevRecord, IDBAccessObject::READ_LATEST );
if ( $oldRevRecord !== null ) {
$oldItemSet = static::getParsedRevision( $oldRevRecord );
} else {