Package Products :: Package ZenHub :: Package services :: Module Procrastinator |
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# Source Code for Module Products.ZenHub.services.Procrastinator

     1  ###########################################################################
     2  #
     3  # This program is part of Zenoss Core, an open source monitoring platform.
     4  # Copyright (C) 2007, Zenoss Inc.
     5  #
     6  # This program is free software; you can redistribute it and/or modify it
     7  # under the terms of the GNU General Public License version 2 as published by
     8  # the Free Software Foundation.
     9  #
    10  # For complete information please visit: http://www.zenoss.com/oss/
    11  #
    12  ###########################################################################
    13  from sets import Set
    14
    15 -class Procrastinate:
    16      "A class to delay executing a change to a device"
    17
    18 -    def __init__(self, cback):
    19          self.cback = cback
    20          self.devices = Set()
    21          self.timer = None
    22
    23 -    def clear(self):
    24          self.devices = Set()
    25
    26 -    def doLater(self, device = None):
    27          if self.timer and not self.timer.called:
    28              self.timer.cancel()
    29          self.devices.add(device)
    30          from twisted.internet import reactor
    31          self.timer = reactor.callLater(5, self._doNow)
    32
    33
    34 -    def _doNow(self, *unused):
    35          if self.devices:
    36              device = self.devices.pop()
    37              d = self.cback(device)
    38              if d:
    39                  d.addBoth(self._doNow)
    40