module Scrivito
module Backend

module ObjLoad
  def self.load(revision, ids)
    cache = Backend::ObjDataCache.view_for_revision(revision)

    missing_ids = []
    results_from_cache = ids.map do |id|
      result = cache.read_obj(id)

      missing_ids << id unless result

      result
    end

    overall_results =
      if missing_ids.blank?
        results_from_cache
      else
        raw_results = revision.obj_mget_request(missing_ids)

        results_from_backend = raw_results.map do |result|
          ObjDataCache.convert_from_backend(result)
        end

        results_from_backend.each_with_index do |result, index|
          cache.write_obj(missing_ids[index], result)
        end

        results_from_cache.map do |result|
          result || results_from_backend.shift
        end
      end

    overall_results.map do |raw_data|
      if raw_data != ObjDataCache::NONEXISTENT_OBJ
        Backend::ObjDataFromRest.new(raw_data)
      end
    end
  end
end

end
end