You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: queue.rb
    path of file: ./repos/rails_event_store/contrib/dres_rails/app/models/dres_rails
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module DresRails
  class Queue < ::ActiveRecord::Base
    has_many :jobs, -> { order(:id) }

    def self.last_processed_event_id_for(app_name)
      where(name: app_name).pluck(:last_processed_event_id).first
    end

    def process(event_id, &job)
      error = nil
      with_lock do
        return if already_processed
    
    def process(event_id, &job)
      error = nil
      with_lock do
        return if already_processed?(event_id)
        begin
          transaction(requires_new: true) do
            job.call
            jobs.create!(event_id: event_id, state: "success")
          end
        rescue => x
          jobs.create!(event_id: event_id, state: "failure")
          error = x
        ensure
          update!(last_processed_event_id: event_id)
        end
      end