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signalutils.py
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Fri, Feb 21, 12:57

signalutils.py
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# -*- coding: utf-8 -*-
## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Invenio signal utilities
This module defines Invenio-wide signals
"""
from blinker import Namespace
_signals = Namespace()
# WebSearch signals
webcoll_after_webpage_cache_update = _signals.signal(
'webcoll-after-webpage-cache-update')
"""
This signal is sent right after webcoll runs webpage cache update.
It is passed the collection to be sent named `response`.
Example subscriber::
def clear_additional_cache(sender, collection=None, lang=None):
pass
from invenio.signalutils import webcoll_after_webpage_cache_update
from flask import current_app
webcoll_after_webpage_cache_update.connect(
clear_additional_cache,
current_app._get_current_object()
)
"""
pre_command = _signals.signal('pre-command')
"""
This signal is sent right before any inveniomanage command is executed.
Example subscriber::
def backup_database(sender, *args, **kwargs):
pass
from invenio.signalutils import pre_command
from invenio.database_manager import drop
pre_command.connect(
backup_database,
sender=drop
)
"""
post_command = _signals.signal('post-command')
"""
This signal is sent right after any inveniomanage command is executed.
Example subscriber::
def modify_demosite(sender, *args, **kwargs):
pass
from invenio.signalutils import post_command
from invenio.database_manager import demosite
pre_command.connect(
modify_demosite,
sender=demosite
)
"""
# Record related signals
record_before_create = _signals.signal(
'record-before-create')
"""
This signal is sent before record is created.
"""
record_after_create = _signals.signal(
'record-after-create')
"""
This signal is sent after record is created.
"""
record_before_update = _signals.signal(
'record-before-update')
"""
This signal is sent before record is updated.
"""
record_after_update = _signals.signal(
'record-after-update')
"""
This signal is sent after record is updated.
"""

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