#
#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Basic job scheduler using twisted.

$Id$
"""

from time import time
from zope.interface import implements

from cybertools.agent.base.agent import Master
from cybertools.agent.base.schedule import Scheduler as BaseScheduler
from cybertools.agent.common import states
from cybertools.agent.components import schedulers
from cybertools.agent.interfaces import IScheduler

from twisted.internet import reactor
from twisted.internet.defer import Deferred


class Scheduler(BaseScheduler):

    implements(IScheduler)

    def __init__(self, agent):
        self.agent = agent

    def schedule(self, job, startTime=None):
        job.startTime = startTime or int(time())
        if startTime is None:
            startTime = int(time())
        job.startTime = startTime
        job.state = states.scheduled
        reactor.callLater(startTime-int(time()), job.execute)
        return startTime

    def getJobsToExecute(startTime=0):
        return [j for j in self.queue.values() if startTime <= j.startTime]

schedulers.register(Scheduler, Master, name='core')