text: #!/usr/bin/env python3
  # MIT License
  #
  # Copyright (c) 2020 FABRIC Testbed
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
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  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
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  # Author: Komal Thareja (kthare10@renci.org)
  from fabric_cf.actor.core.apis.abc_delegation import ABCDelegation
  from fabric_cf.actor.core.time.actor_clock import ActorClock
  from fabric_cf.actor.core.util.reservation_holdings import ReservationHoldings
  from fabric_cf.actor.core.util.reservation_list import ReservationList
  
  
  class SourceCalendar:
      """
      SourceCalendar organizes state for a delegation used as a
      source for client reservations. A source calendar maintains a list of
      "outlays", client reservations that have been allocated from the source
      delegation. The outlay calendar is organized by real time.
      The calendar also maintains a list of incoming extension requests for
      reservations that have been satisfied from the underlying source delegations.
      """
      def __init__(self, *, clock: ActorClock, source: ABCDelegation):
          """
          Constructor
          @params clock: clock
          @params source: source delegation
          """
          # Clock.
          self.clock = clock
          # The source delegation.
          self.source = source
          # Allocated reservations.
          self.outlays = ReservationHoldings()
          # Incoming extension requests.
          self.extending = ReservationList()
  
      def tick(self, *, cycle: int):
          ms = self.clock.cycle_end_in_millis(cycle=cycle)
          self.outlays.tick(time=ms)
          self.extending.tick(cycle=cycle)
  