[server] implement dynamic database pooler
Opening too much database connection has a cost at startup and also PostgreSQL
as a maximum number of connection (100 by default).
This get worse when starting multiple wsgi processes, since each process has
its own database pool.
Instead of opening `connections-pool-size` connections to the database at
startup, just open one and open more only when needed.
# -*- coding: utf-8 -*-
# copyright 2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr -- mailto:contact@logilab.fr
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# This program 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
"""cubicweb-forum schema"""
from yams.buildobjs import (String, RichString, EntityType,
RelationDefinition, SubjectRelation)
from yams.reader import context
class Forum(EntityType):
topic = String(maxsize=50, required=True, unique=True)
description = RichString()
class ForumThread(EntityType):
__permissions__ = {
'read': ('managers', 'users'),
'add': ('managers', 'users'),
'update': ('managers', 'owners'),
'delete': ('managers', 'owners')
}
title = String(required=True, fulltextindexed=True, maxsize=256)
content = RichString(required=True, fulltextindexed=True)
in_forum = SubjectRelation('Forum', cardinality='1*', inlined=True,
composite='object')
class interested_in(RelationDefinition):
subject = 'CWUser'
object = ('ForumThread', 'Forum')
class nosy_list(RelationDefinition):
subject = ('Forum', 'ForumThread')
object = 'CWUser'