discourse/lib/post_jobs_enqueuer.rb

class PostJobsEnqueuer
  def initialize(post, topic, new_topic)
    @post = post
    @topic = topic
    @new_topic = new_topic
  end

  def enqueue_jobs
    # We need to enqueue jobs after the transaction. Otherwise they might begin before the data has
    # been comitted.
    feature_topic_users
    trigger_post_post_process
    unless skip_after_create?
      after_post_create
      after_topic_create
    end
  end


  private

  def feature_topic_users
    Jobs.enqueue(:feature_topic_users, topic_id: @topic.id)
  end

  def trigger_post_post_process
    @post.trigger_post_process
  end

  def after_post_create
    if @post.post_number > 1
      TopicTrackingState.publish_unread(@post)
    end

    if SiteSetting.enable_mailing_list_mode
      Jobs.enqueue_in(
          SiteSetting.email_time_window_mins.minutes,
          :notify_mailing_list_subscribers,
          post_id: @post.id
      )
    end
  end

  def after_topic_create
    return unless @new_topic
    # Don't publish invisible topics
    return unless @topic.visible?

    @topic.posters = @topic.posters_summary
    @topic.posts_count = 1

    TopicTrackingState.publish_new(@topic)
  end

  def skip_after_create?
    @topic.private_message? || @post.post_type == Post.types[:moderator_action]
  end
end