Limnoria/src/schedule.py

#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

from fix import *

import time
import bisect

import drivers

class Schedule(drivers.IrcDriver):
    def __init__(self):
        drivers.IrcDriver.__init__(self)
        self.schedule = []
        self.events = {}
        self.counter = 0

    def addEvent(self, f, t, name=None):
        if name is None:
            name = self.counter
            self.counter += 1
        elif type(name) == int:
            raise ValueError, 'int names are reserved for the scheduler.'
        #debug.printf('Added event to schedule: %s' % name)
        assert name not in self.events
        self.events[name] = f
        bisect.insort(self.schedule, (t, name))

    def removeEvent(self, name):
        del self.events[name]
        self.schedule = [(t, n) for (t, n) in self.schedule if n != name]

    def addPeriodicEvent(self, f, t, name=None):
        # Note that you can't name a periodic event -- it'll be erased after
        # it's been run only once.
        def wrapper():
            f()
            self.addEvent(wrapper, time.time() + t, name)
        wrapper()

    removePeriodicEvent = removeEvent

    def run(self):
        #debug.printf(`(time.time(), self.schedule)`)
        while self.schedule and self.schedule[0][0] < time.time():
            (t, name) = self.schedule.pop(0)
            self.events[name]()
            del self.events[name]

try:
    ignore(schedule)
except NameError:
    schedule = Schedule()

addEvent = schedule.addEvent
removeEvent = schedule.removeEvent
addPeriodicEvent = schedule.addPeriodicEvent
removePeriodicEvent = removeEvent
run = schedule.run
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: