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annotate src/tools/trigger.py @ 2160:e67e8cd24141

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core (tools/common): data objects first draft: this module aims is to help manipulate complex data from bridge, mainly for the template system. It is in common and not only in frontends as it may be used in some case by backend, if it needs to use template system in the future.
author Goffi <goffi@goffi.org>
date Tue, 21 Feb 2017 21:01:40 +0100
parents 2daf7b4c6756
children 8b37a62336c3
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1 #!/usr/bin/env python2
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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) 2009-2016 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 from sat.core.i18n import _
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23 from sat.core.log import getLogger
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24 log = getLogger(__name__)
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27 class TriggerException(Exception):
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28 pass
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31 class SkipOtherTriggers(Exception):
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32 """ Exception to raise if normal behaviour must be followed instead of
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33 following triggers list """
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34 pass
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37 class TriggerManager(object):
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38 """This class manage triggers: code which interact to change the behaviour
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39 of SàT"""
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41 try: # FIXME: to be removed when a better solution is found
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42 MIN_PRIORITY = float('-inf')
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43 MAX_PRIORITY = float('+inf')
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44 except: # XXX: Pyjamas will bug if you specify ValueError here
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45 # Pyjamas uses the JS Float class
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46 MIN_PRIORITY = Number.NEGATIVE_INFINITY
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47 MAX_PRIORITY = Number.POSITIVE_INFINITY
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49 def __init__(self):
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50 self.__triggers = {}
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52 def add(self, point_name, callback, priority=0):
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53 """Add a trigger to a point
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54 @param point_name: name of the point when the trigger should be run
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55 @param callback: method to call at the trigger point
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56 @param priority: callback will be called in priority order, biggest
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57 first
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58 """
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59 if point_name not in self.__triggers:
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60 self.__triggers[point_name] = []
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61 if priority != 0 and priority in [trigger_tuple[0] for trigger_tuple in self.__triggers[point_name]]:
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62 if priority in (self.MIN_PRIORITY, self.MAX_PRIORITY):
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63 log.warning(_(u"There is already a bound priority [%s]") % point_name)
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64 else:
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65 log.debug(_(u"There is already a trigger with the same priority [%s]") % point_name)
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66 self.__triggers[point_name].append((priority, callback))
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67 self.__triggers[point_name].sort(key=lambda trigger_tuple:
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68 trigger_tuple[0], reverse=True)
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70 def remove(self, point_name, callback):
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71 """Remove a trigger from a point
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72 @param point_name: name of the point when the trigger should be run
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73 @param callback: method to remove, must exists in the trigger point"""
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74 for trigger_tuple in self.__triggers[point_name]:
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75 if trigger_tuple[1] == callback:
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76 self.__triggers[point_name].remove(trigger_tuple)
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77 return
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78 raise TriggerException("Trying to remove an unexisting trigger")
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80 def point(self, point_name, *args, **kwargs):
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81 """This put a trigger point
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82 All the trigger for that point will be run
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83 @param point_name: name of the trigger point
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84 @return: True if the action must be continued, False else"""
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85 if point_name not in self.__triggers:
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86 return True
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88 for priority, trigger in self.__triggers[point_name]:
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89 try:
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90 if not trigger(*args, **kwargs):
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91 return False
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92 except SkipOtherTriggers:
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93 break
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94 return True