OpenNebula

The method find_by_ref walks over the xml pool extracting info using xpath. This is too slow when several calls are made as each do the same xpath calls. This info can be cached in a hash.

    def self.find_by_ref(the_class, attribute, ref, vcenter_uuid, pool = nil)
        pool = one_pool(the_class, false) if pool.nil?
        element = pool.find{|e|
            e["#{attribute}"] == ref &&
            (!e["TEMPLATE/OPENNEBULA_MANAGED"] || e["TEMPLATE/OPENNEBULA_MANAGED"] != "NO") &&
            (e["TEMPLATE/VCENTER_INSTANCE_ID"] == vcenter_uuid ||
             e["USER_TEMPLATE/VCENTER_INSTANCE_ID"] == vcenter_uuid)}

        return element
    end