+import time
from types import StringTypes
from collections import defaultdict
from sfa.rspecs.rspec import RSpec
from sfa.planetlab.vlink import VLink
from sfa.planetlab.topology import Topology
-from sfa.planetlab.plxrn import PlXrn, hrn_to_pl_slicename
+from sfa.planetlab.plxrn import PlXrn, hrn_to_pl_slicename, xrn_to_hostname
from sfa.storage.model import SliverAllocation
from sfa.storage.alchemy import dbsession