annotate sat_frontends/tools/host_listener.py @ 3167:d0fb79f97466

quick frontends (app): added an "ignore_missing" argument to RemoveListener: normally an error is logged when removeListener is call on a inexisting listener, but sometimes listeners are added only in specific scenarios, and it may be handy to try to delete them without having to explictly check that they have been used.
author Goffi <goffi@goffi.org>
date Wed, 12 Feb 2020 19:44:05 +0100
parents 559a625a236b
children be6d91572633
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1 #!/usr/bin/env python3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2020 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 """This module is only used launch callbacks when host is ready, used for early initialisation stuffs"""
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23 listeners = []
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26 def addListener(cb):
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27 """Add a listener which will be called when host is ready
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29 @param cb: callback which will be called when host is ready with host as only argument
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30 """
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31 listeners.append(cb)
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34 def callListeners(host):
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35 """Must be called by frontend when host is ready.
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37 The call will launch all the callbacks, then remove the listeners list.
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38 @param host(QuickApp): the instancied QuickApp subclass
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39 """
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40 global listeners
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41 while True:
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42 try:
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43 cb = listeners.pop(0)
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44 cb(host)
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45 except IndexError:
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46 break
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47 del listeners