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annotate roundup/instance.py @ 1162:86d41c31f9be

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old habits...
author Richard Jones <richard@users.sourceforge.net>
date Wed, 18 Sep 2002 00:02:13 +0000
parents 30db4a11d700
children 8e318dfaf479
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1 #
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2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
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3 # This module is free software, and you may redistribute it and/or modify
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4 # under the same terms as Python, so long as this copyright message and
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5 # disclaimer are retained in their original form.
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6 #
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7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
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8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
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9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
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10 # POSSIBILITY OF SUCH DAMAGE.
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11 #
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12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
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15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
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16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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17 #
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18 # $Id: instance.py,v 1.8 2002-09-18 00:02:13 richard Exp $
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19
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20 __doc__ = '''
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21 Tracker handling (open tracker).
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23 Currently this module provides one function: open. This function opens
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24 a tracker. Note that trackers used to be called instances.
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25 '''
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27 import imp, os
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29 class TrackerError(Exception):
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30 pass
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32 class Opener:
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33 def __init__(self):
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34 self.number = 0
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35 self.trackers = {}
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37 def open(self, tracker_home):
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38 ''' Open the tracker.
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40 Raise ValueError if the tracker home doesn't exist.
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41 '''
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42 if not os.path.exists(tracker_home):
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43 raise ValueError, 'no such directory: "%s"'%tracker_home
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44 if self.trackers.has_key(tracker_home):
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45 return imp.load_package(self.trackers[tracker_home],
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46 tracker_home)
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47 self.number = self.number + 1
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48 modname = '_roundup_tracker_%s'%self.number
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49 self.trackers[tracker_home] = modname
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51 # load the tracker
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52 tracker = imp.load_package(modname, tracker_home)
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54 # ensure the tracker has all the required bits
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55 for required in 'config open init Client MailGW'.split():
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56 if not hasattr(tracker, required):
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57 raise TrackerError, 'Required tracker attribute "%s" '\
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58 'missing'%required
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60 return tracker
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62 opener = Opener()
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63 open = opener.open
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65 del Opener
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66 del opener
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69 # vim: set filetype=python ts=4 sw=4 et si
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