Source Code for Module Products.ZenUtils.guid.event

 1  ############################################################################## 
 2  #  
 3  # Copyright (C) Zenoss, Inc. 2010, all rights reserved. 
 4  #  
 5  # This content is made available according to terms specified in 
 6  # License.zenoss under the directory where your Zenoss product is installed. 
 7  #  
 8  ############################################################################## 
 9   
10   
11  import logging 
12  from zope.event import notify 
13  from zope.component import adapter 
14  from zope.interface import implements 
15  from zope.component.interfaces import ObjectEvent 
16  from zope.container.interfaces import IObjectMovedEvent, IObjectRemovedEvent 
17  from OFS.interfaces import IObjectWillBeMovedEvent, IObjectWillBeAddedEvent 
18  from .interfaces import IGUIDEvent, IGUIDManager, IGloballyIdentifiable 
19  from .interfaces import IGlobalIdentifier 
20   
21  log = logging.getLogger('zen.UUID') 
22   
23   
24 -class GUIDEvent(ObjectEvent): 
25      implements(IGUIDEvent) 
26 -    def __init__(self, object, old, new, update_global_catalog=True): 
27          super(GUIDEvent, self).__init__(object) 
28          self.old = old 
29          self.new = new 
30          self.update_global_catalog = update_global_catalog 
31   
32   
33  @adapter(IGloballyIdentifiable, IGUIDEvent) 
34 -def registerGUIDToPathMapping(object, event): 
35      mgr = IGUIDManager(object) 
36      if event.new: 
37          mgr.setObject(event.new, object) 
38          if event.update_global_catalog: 
39              try: 
40                  catalog = object.global_catalog 
41                  catalog.catalog_object(object, idxs=(), update_metadata=True) 
42              except Exception: 
43                  log.exception('Encountered a guid exception') 
44      if event.old and event.old != event.new: 
45          # When we move a component around, 
46          # we don't want to remove the guid 
47          # from the catalog 
48          if mgr.getPath(event.old) == object.getPrimaryUrlPath(): 
49              mgr.remove(event.old) 
50   
51   
52  @adapter(IGloballyIdentifiable, IObjectMovedEvent) 
53 -def refireEventOnObjectAddOrMove(object, event): 
54      if not IObjectRemovedEvent.providedBy(event): 
55          oldguid = IGlobalIdentifier(object).getGUID() 
56          if oldguid is None: 
57              IGlobalIdentifier(object).create() 
58          else: 
59              # Refire in the case where an object already has a guid 
60              # but that guid has been removed from the guid table 
61              notify(GUIDEvent(object, oldguid, oldguid)) 
62   
63   
64  @adapter(IGloballyIdentifiable, IObjectWillBeMovedEvent) 
65 -def refireEventOnObjectBeforeRemove(object, event): 
66      if not IObjectWillBeAddedEvent.providedBy(event): 
67          guid = IGlobalIdentifier(object).guid 
68          notify(GUIDEvent(object, guid, None)) 
69