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: project_cache_worker.rb
    path of file: ./repos/gitlabhq/app/workers
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Worker for updating any project specific caches.
class ProjectCacheWorker
  include ApplicationWorker

  data_consistency :
    
  def update_statistics(project, statistics = [])
    return if Gitlab::Database.read_only?
    return unless try_obtain_lease_for(project.id, statistics)

    Projects::UpdateStatisticsService.new(project, nil, statistics: statistics).execute

    lease_key = project_cache_worker_key(project.id, statistics)
    UpdateProjectStatisticsWorker.perform_in(LEASE_TIMEOUT, lease_key, project.id, statistics)
  end