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# l=J 05 ^n1h l_ ? ############################################################################## # # Copyright (c) 2004 Zope Foundation and Contributors. # All Rights Reserved. # # This software is subject to the provisions of the Zope Public License, # Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS # FOR A PARTICULAR PURPOSE. # ############################################################################## """Adapter management """ import weakref from zope.interface import providedBy from zope.interface import Interface from zope.interface import ro from zope.interface._compat import _u from zope.interface._compat import _normalize_name _BLANK = _u('') class BaseAdapterRegistry(object): # List of methods copied from lookup sub-objects: _delegated = ('lookup', 'queryMultiAdapter', 'lookup1', 'queryAdapter', 'adapter_hook', 'lookupAll', 'names', 'subscriptions', 'subscribers') # All registries maintain a generation that can be used by verifying # registries _generation = 0 def __init__(self, bases=()): # The comments here could be improved. Possibly this bit needs # explaining in a separate document, as the comments here can # be quite confusing. /regebro # {order -> {required -> {provided -> {name -> value}}}} # Here "order" is actually an index in a list, "required" and # "provided" are interfaces, and "required" is really a nested # key. So, for example: # for order == 0 (that is, self._adapters[0]), we have: # {provided -> {name -> value}} # but for order == 2 (that is, self._adapters[2]), we have: # {r1 -> {r2 -> {provided -> {name -> value}}}} # self._adapters = [] # {order -> {required -> {provided -> {name -> [value]}}}} # where the remarks about adapters above apply self._subscribers = [] # Set, with a reference count, keeping track of the interfaces # for which we have provided components: self._provided = {} # Create ``_v_lookup`` object to perform lookup. We make this a # separate object to to make it easier to implement just the # lookup functionality in C. This object keeps track of cache # invalidation data in two kinds of registries. # Invalidating registries have caches that are invalidated # when they or their base registies change. An invalidating # registry can only have invalidating registries as bases. # See LookupBaseFallback below for the pertinent logic. # Verifying registies can't rely on getting invalidation messages, # so have to check the generations of base registries to determine # if their cache data are current. See VerifyingBasePy below # for the pertinent object. self._createLookup() # Setting the bases causes the registries described above # to be initialized (self._setBases -> self.changed -> # self._v_lookup.changed). self.__bases__ = bases def _setBases(self, bases): self.__dict__['__bases__'] = bases self.ro = ro.ro(self) self.changed(self) __bases__ = property(lambda self: self.__dict__['__bases__'], lambda self, bases: self._setBases(bases), ) def _createLookup(self): s