MessageCacheUpdate.php

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<?php
use MediaWiki\MediaWikiServices;
use Wikimedia\Assert\Assert;
 
class MessageCacheUpdate implements DeferrableUpdate, MergeableUpdate {
    private $replacements = [];
 
    public function __construct( $code, $title, $msg ) {
        $this->replacements[$code][] = [ $title, $msg ];
    }
 
    public function merge( MergeableUpdate $update ) {
        Assert::parameterType( __CLASS__, $update, '$update' );
        '@phan-var self $update';
 
        foreach ( $update->replacements as $code => $messages ) {
            $this->replacements[$code] = array_merge( $this->replacements[$code] ?? [], $messages );
        }
    }
 
    public function doUpdate() {
        $messageCache = MediaWikiServices::getInstance()->getMessageCache();
        foreach ( $this->replacements as $code => $replacements ) {
            $messageCache->refreshAndReplaceInternal( $code, $replacements );
        }
    }
}