############################################################################## # # Copyright (c) 2002 Nexedi SARL and Contributors. All Rights Reserved. # Sebastien Robin <seb@nexedi.com> # # WARNING: This program as such is intended to be used by professional # programmers who take the whole responsability of assessing all potential # consequences resulting from its eventual inadequacies and bugs # End users who are looking for a ready-to-use solution with commercial # garantees and support are strongly adviced to contract a Free Software # Service Company # # This program 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. # # 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 General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. # ############################################################################## from Products.CMFCore.utils import UniqueObject from AccessControl import ClassSecurityInfo from Globals import InitializeClass, DTMLFile, PersistentMapping from Products.ERP5Type.Document.Folder import Folder from Products.ERP5Type import Permissions from Products.ERP5 import _dtmldir import threading from zLOG import LOG from BTrees.Length import Length class IdTool(UniqueObject, Folder): """ This tools handles the generation of IDs. """ id = 'portal_ids' meta_type = 'ERP5 Id Tool' portal_type = 'Id Tool' # Declarative Security security = ClassSecurityInfo() # # ZMI methods # manage_options = ( ( { 'label' : 'Overview' , 'action' : 'manage_overview' } , ) + Folder.manage_options ) security.declareProtected( Permissions.ManagePortal, 'manage_overview' ) manage_overview = DTMLFile( 'explainIdTool', _dtmldir ) # Filter content (ZMI)) def __init__(self): return Folder.__init__(self, IdTool.id) security.declareProtected(Permissions.AccessContentsInformation, 'getLastGeneratedId') def getLastGeneratedId(self,id_group=None,default=None): """ Get the last id generated """ if getattr(self, 'dict_ids', None) is None: self.dict_ids = PersistentMapping() last_id = None if id_group is not None and id_group!='None': last_id = self.dict_ids.get(id_group, default) return last_id security.declareProtected(Permissions.ModifyPortalContent, 'setLastGeneratedId') def setLastGeneratedId(self,new_id,id_group=None): """ Set a new last id. This is usefull in order to reset a sequence of ids. """ if getattr(self, 'dict_ids', None) is None: self.dict_ids = PersistentMapping() if id_group is not None and id_group!='None': l = threading.Lock() l.acquire() try: self.dict_ids[id_group] = new_id finally: l.release() security.declareProtected(Permissions.AccessContentsInformation, 'generateNewId') def generateNewId(self, id_group=None, default=None, method=None): """ Generate a new Id """ if getattr(self, 'dict_ids', None) is None: self.dict_ids = PersistentMapping() new_id = None if id_group is not None and id_group!='None': # Getting the last id last_id = None l = threading.Lock() l.acquire() try: class Dummy: pass dummy = Dummy() last_id = self.dict_ids.get(id_group, dummy) if last_id is dummy: if default is None: new_id=0 else: new_id=default else: # Now generate a new id if method is not None: new_id = method(last_id) else: new_id = last_id + 1 # Store the new value self.dict_ids[id_group] = new_id finally: l.release() return new_id security.declareProtected(Permissions.AccessContentsInformation, 'generateNewLongId') def generateNewLongId(self, **kw): """ Returns the ZODB transation id to be used as an identifier. It's a 64bits number, so it can look ugly and/or huge to users. """ tid = get_transaction()._id; # It's a 64 bits number, but sometimes it returns as a negative int... so # make it positive again and add 2**63. return (tid < 0) and (2**63 - tid) or tid; security.declareProtected(Permissions.AccessContentsInformation, 'getDictLengthIdsItems') def getDictLengthIdsItems(self): """ Return a copy of dict_length_ids. This is a workaround to access the persistent mapping content from ZSQL method to be able to insert initial tuples in the database at creation. """ if getattr(self, 'dict_length_ids', None) is None: self.dict_length_ids = PersistentMapping() return self.dict_length_ids.items() security.declareProtected(Permissions.AccessContentsInformation, 'generateNewLengthId') def generateNewLengthId(self, id_group=None, default=None): """ Generates an Id. The id is generated by mysql and then stored in a Length object in a persistant mapping to be persistent. We use MySQL to generate an ID, because it is atomic and we don't want to generate any conflict at zope level. The possible downfall is that some IDs might be skipped because of failed transactions. "Length" is because the id is stored in a python object inspired by BTrees.Length. It doesn't have to be a length. """ if getattr(self, 'dict_length_ids', None) is None: self.dict_length_ids = PersistentMapping() new_id = None if id_group not in (None, 'None'): if not isinstance(id_group, str): id_group = repr(id_group) default = isinstance(default, int) and default or 1 portal_catalog = self.getPortalObject().portal_catalog['erp5_mysql'] query = getattr(portal_catalog, 'z_portal_ids_generate_id') commit = getattr(portal_catalog, 'z_portal_ids_commit') if None not in (query, commit): result = query(id_group=id_group, default=default) commit() new_id = result[0]['LAST_INSERT_ID()'] if self.dict_length_ids.get(id_group) is None: self.dict_length_ids[id_group]=Length(new_id) self.dict_length_ids[id_group].set(new_id) return new_id InitializeClass(IdTool)