How to use

topicExists

method

in

pl.allegro.tech.hermes.domain.topic.TopicRepository

public TopicMetrics getTopicMetrics(TopicName topicName) {
  return topicRepository.topicExists(topicName) ? metricRepository.loadMetrics(topicName) : TopicMetrics.unavailable();
}

private void ensureTopicDoesNotExist(Topic topic) {
  if (topicRepository.topicExists(topic.getName())) {
    throw new TopicAlreadyExistsException(topic.getName());
  }
}

private SubscriptionName createSubscription(SubscriptionName subscriptionName) {
  Subscription subscription = subscription(subscriptionName).build();
  Group group = Group.from(subscription.getTopicName().getGroupName());
  if (!groupRepository.groupExists(group.getGroupName())) {
    groupRepository.createGroup(group);
  }
  if (!topicRepository.topicExists(subscription.getTopicName())) {
    topicRepository.createTopic(topic(subscription.getTopicName()).build());
  }
  subscriptionRepository.createSubscription(subscription);
  await().atMost(adjust(ONE_SECOND)).until(
      () -> {
        subscriptionRepository.subscriptionExists(subscription.getTopicName(), subscription.getName());
        subscriptionsCaches.forEach(subscriptionsCache ->
            subscriptionsCache.listActiveSubscriptionNames().contains(subscriptionName));
      }
  );
  return subscription.getQualifiedName();
}