#!/usr/bin/env python

#Copyright (C) 2011 by Benedict Paten (benedictpaten@gmail.com)
#
#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.
#
#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.
 
from jobTree.batchSystems.abstractBatchSystem import AbstractBatchSystem
from jobTree.batchSystems.singleMachine import SingleMachineBatchSystem
from jobTree.batchSystems.parasol import ParasolBatchSystem

import time

class CombinedBatchSystem(AbstractBatchSystem):
    """Takes two batch systems and a choice function to decide which to issue to.
    """
    def __init__(self, config, batchSystem1, batchSystem2, batchSystemChoiceFn):
        AbstractBatchSystem.__init__(self, config) #Call the parent constructor
        self.batchSystem1 = batchSystem1
        self.batchSystem2 = batchSystem2
        self.batchSystemChoiceFn = batchSystemChoiceFn

    def issueJob(self, command, memory, cpu, logFile):
        if self.batchSystemChoiceFn(command, memory, cpu):
            return self.batchSystem1.issueJob(command, memory, cpu, logFile)
        else:
            return self.batchSystem2.issueJob(command, memory, cpu, logFile)
        
    def killJobs(self, jobIDs):
        self.batchSystem1.killJobs(jobIDs)
        self.batchSystem2.killJobs(jobIDs)
    
    def getIssuedJobIDs(self):
        return self.batchSystem1.getIssuedJobIDs() + self.batchSystem2.getIssuedJobIDs()
    
    def getRunningJobIDs(self):
        return self.batchSystem1.getRunningJobIDs() + self.batchSystem2.getRunningJobIDs()
    
    def getUpdatedJob(self, maxWait):
        endTime = time.time() + maxWait
        while 1:
            updatedJob = self.batchSystem1.getUpdatedJob(0)
            if updatedJob != None:
                return updatedJob
            updatedJob = self.batchSystem2.getUpdatedJob(0)
            if updatedJob != None:
                return updatedJob
            remaining = endTime - time.time()
            if remaining <= 0:
                return None
            time.sleep(0.01)
    
    def getRescueJobFrequency(self):
        return min(self.batchSystem1.getRescueJobFrequency(), self.batchSystem2.getRescueJobFrequency())