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annotate src/tools/misc.py @ 741:00318e60a06a

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core (tools): set min and max priorities for triggers and warn if several triggers have the same not null priority
author souliane <souliane@mailoo.org>
date Fri, 13 Dec 2013 05:35:24 +0100
parents 84a6e83157c2
children 03744d9ebc13
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013 Jérôme Poisson (goffi@goffi.org)
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 """Misc usefull classes"""
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22 import sys
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23 from logging import debug, warning
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25 class TriggerException(Exception):
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26 pass
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29 class SkipOtherTriggers(Exception):
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30 """ Exception to raise if normal behaviour must be followed instead of
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31 followind triggers list """
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32 pass
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34
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35 class TriggerManager(object):
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36 """This class manage triggers: code which interact to change de behaviour
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37 of SàT"""
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39 MIN_PRIORITY = float('-inf')
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40 MAX_PRIORITY = float('+inf')
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42 def __init__(self):
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43 self.__triggers = {}
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45 def add(self, point_name, callback, priority=0):
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46 """Add a trigger to a point
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47 @param point_name: name of the point when the trigger should be run
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48 @param callback: method to call at the trigger point
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49 @param priority: callback will be called in priority order, biggest
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50 first
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51 """
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52 if point_name not in self.__triggers:
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53 self.__triggers[point_name] = []
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54 if priority != 0 and priority in [trigger_tuple[0] for trigger_tuple in self.__triggers[point_name]]:
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55 if priority in (MIN_PRIORITY, MAX_PRIORITY):
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56 warning(_("There is already a bound priority [%s]") % point_name)
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57 else:
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58 debug(_("There is already a trigger with the same priority [%s]") % point_name)
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59 self.__triggers[point_name].append((priority, callback))
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60 self.__triggers[point_name].sort(key=lambda trigger_tuple:
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61 trigger_tuple[0], reverse=True)
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63 def remove(self, point_name, callback):
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64 """Remove a trigger from a point
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65 @param point_name: name of the point when the trigger should be run
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66 @param callback: method to remove, must exists in the trigger point"""
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67 for trigger_tuple in self.__triggers[point_name]:
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68 if trigger_tuple[1] == callback:
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69 self.__triggers[point_name].remove(trigger_tuple)
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70 return
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71 raise TriggerException("Trying to remove an unexisting trigger")
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73 def point(self, point_name, *args, **kwargs):
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74 """This put a trigger point
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75 All the trigger for that point will be run
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76 @param point_name: name of the trigger point
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77 @return: True if the action must be continued, False else"""
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78 if point_name not in self.__triggers:
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79 return True
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81 for priority,trigger in self.__triggers[point_name]:
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82 try:
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83 if not trigger(*args, **kwargs):
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84 return False
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85 except SkipOtherTriggers:
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86 break
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87 return True