SalesChannelIndexerEvent example

$ids = $message->getData();

        $ids = array_unique(array_filter($ids));
        if (empty($ids)) {
            return;
        }

        if ($message->allow(self::MANY_TO_MANY_UPDATER)) {
            $this->manyToManyUpdater->update(SalesChannelDefinition::ENTITY_NAME, $ids, $message->getContext());
        }

        $this->eventDispatcher->dispatch(new SalesChannelIndexerEvent($ids, $message->getContext(), $message->getSkip()));
    }

    public function getTotal(): int
    {
        return $this->iteratorFactory->createIterator($this->repository->getDefinition())->fetchCount();
    }

    public function getDecorated(): EntityIndexer
    {
        throw new DecorationPatternException(static::class);
    }