<commit_before>"""
Module for checking resource reservations by chutes.

One idea motivating this design is to reduce the amount of state
in memory for resource reservations.  We have the chute list, which
contains information about what devices the chute is using.  If we also
maintain a separate list of devices used by chutes, we need to keep
them synchronized.  This becomes messy when a chute fails to install
or uninstall correctly.  The getDeviceReservations function iterates
over the chute list and returns an up-to-date view of device usage.
This can be called as needed.
"""
import collections

from paradrop.core.config.devices import getWirelessPhyName
from paradrop.core.config.hostconfig import prepareHostConfig
from paradrop.core.chute.chute_storage import ChuteStorage


class DeviceReservations(object):
    def __init__(self):
        self.reservations = []<commit_msg>Fixed missing import.<commit_after>"""
Module for checking resource reservations by chutes.

One idea motivating this design is to reduce the amount of state
in memory for resource reservations.  We have the chute list, which
contains information about what devices the chute is using.  If we also
maintain a separate list of devices used by chutes, we need to keep
them synchronized.  This becomes messy when a chute fails to install
or uninstall correctly.  The getDeviceReservations function iterates
over the chute list and returns an up-to-date view of device usage.
This can be called as needed.
"""
import collections


from paradrop.base import settings
from paradrop.core.config.devices import getWirelessPhyName
from paradrop.core.config.hostconfig import prepareHostConfig
from paradrop.core.chute.chute_storage import ChuteStorage


class DeviceReservations(object):
    def __init__(self):
        self.reservations = []
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