#   Copyright 2015 Ufora Inc.
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

import time
import logging

def waitCumulusReady(gateway, numWorkers):
    '''Wait until all of the cumulus nodes are active in the CumulusActiveMachines table'''
    # This is currently necessary because cumulus doesn't seem to properly handle machines
    # being added or removed while it is in the middle of a computation

    while len(gateway.activeMachines.activeMachineIds) != numWorkers:
        logging.debug("Cumulus has %s workers, not %s. Waiting...",
                      len(gateway.activeMachines.activeMachineIds),
                      numWorkers)
        time.sleep(.25)


