d564ff0de1
git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@1935 fd906abe-77d9-0310-91a1-e0d9ade77398
114 lines
3 KiB
Python
114 lines
3 KiB
Python
#
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# Copyright (c) 2007 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Job scheduling.
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$Id$
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"""
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from time import time
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from twisted.internet import reactor
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from twisted.internet.defer import Deferred, succeed
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from zope.interface import implements
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from loops.agent.interfaces import IScheduler, IScheduledJob
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class Scheduler(object):
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implements(IScheduler)
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def __init__(self, agent):
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self.agent = agent
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self.queue = {}
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@property
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def logger(self):
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return self.agent.logger()
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def schedule(self, job, startTime=None):
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if startTime is None:
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startTime = int(time())
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job.startTime = startTime
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job.scheduler = self
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while startTime in self.queue:
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startTime += 1
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self.queue[startTime] = job
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reactor.callLater(startTime-int(time()), job.run)
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return startTime
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def getJobsToExecute(startTime=0):
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return [j for j in self.queue.values() if startTime <= j.startTime]
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class Job(object):
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implements(IScheduledJob)
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scheduler = None
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whenStarted = lambda self, job: None
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whenFinished = lambda self, job, result: None
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def __init__(self, **params):
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self.startTime = 0
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self.params = params
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self.successors = []
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self.repeat = 0
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def execute(self):
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""" Must be overridden by subclass.
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"""
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return succeed('OK')
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def reschedule(self, startTime):
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return self.scheduler.schedule(self.copy(), startTime)
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def run(self):
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d = self.execute()
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d.addCallback(self.finishRun)
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self.whenStarted(self)
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# TODO: logging
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def finishRun(self, result):
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# remove from queue
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del self.scheduler.queue[self.startTime]
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# run successors
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for job in self.successors:
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job.params['result'] = result
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#job.run()
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self.scheduler.schedule(job)
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self.whenFinished(self, result)
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# TODO: logging
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# reschedule if necessary
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if self.repeat:
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self.reschedule(int(time() + self.repeat))
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def copy(self):
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newJob = Job()
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newJob.params = self.params
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newJob.successors = [s.copy() for s in self.successors]
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class Stopper(Job):
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def execute(self):
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reactor.stop()
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return succeed('Agent stopped.')
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