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##############################################################################
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#
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# Copyright (c) 2004 Zope Foundation and Contributors.
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# All Rights Reserved.
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#
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# This software is subject to the provisions of the Zope Public License,
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# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
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# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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# FOR A PARTICULAR PURPOSE.
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#
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##############################################################################
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"""Adapter management
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"""
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from __future__ import absolute_import
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import weakref
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from . import implementer
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from . import providedBy
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from . import Interface
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from . import ro
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from .interfaces import IAdapterRegistry
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from ._compat import _normalize_name
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from ._compat import STRING_TYPES
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_BLANK = u''
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class BaseAdapterRegistry(object):
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# List of methods copied from lookup sub-objects:
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_delegated = ('lookup', 'queryMultiAdapter', 'lookup1', 'queryAdapter',
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'adapter_hook', 'lookupAll', 'names',
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'subscriptions', 'subscribers')
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# All registries maintain a generation that can be used by verifying
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# registries
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_generation = 0
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def __init__(self, bases=()):
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# The comments here could be improved. Possibly this bit needs
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# explaining in a separate document, as the comments here can
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# be quite confusing. /regebro
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# {order -> {required -> {provided -> {name -> value}}}}
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# Here "order" is actually an index in a list, "required" and
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# "provided" are interfaces, and "required" is really a nested
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# key. So, for example:
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# for order == 0 (that is, self._adapters[0]), we have:
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# {provided -> {name -> value}}
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# but for order == 2 (that is, self._adapters[2]), we have:
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# {r1 -> {r2 -> {provided -> {name -> value}}}}
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#
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self._adapters = []
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# {order -> {required -> {provided -> {name -> [value]}}}}
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# where the remarks about adapters above apply
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self._subscribers = []
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# Set, with a reference count, keeping track of the interfaces
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# for which we have provided components:
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self._provided = {}
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# Create ``_v_lookup`` object to perform lookup. We make this a
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# separate object to to make it easier to implement just the
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# lookup functionality in C. This object keeps track of cache
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# invalidation data in two kinds of registries.
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# Invalidating registries have caches that are invalidated
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# when they or their base registies change. An invalidating
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# registry can only have invalidating registries as bases.
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# See LookupBaseFallback below for the pertinent logic.
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# Verifying registies can't rely on getting invalidation messages,
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# so have to check the generations of base registries to determine
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# if their cache data are current. See VerifyingBasePy below
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# for the pertinent object.
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self._createLookup()
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# Setting the bases causes the registries described above
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# to be initialized (self._setBases -> self.changed ->
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# self._v_lookup.changed).
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self.__bases__ = bases
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def _setBases(self, bases):
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self.__dict__['__bases__'] = bases
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self.ro = ro.ro(self)
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self.changed(self)
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__bases__ = property(lambda self: self.__dict__['__bases__'],
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lambda self, bases: self._setBases(bases),
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)
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def _createLookup(self):
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self._v_lookup = self.LookupClass(self)
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for name in self._delegated:
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self.__dict__[name] = getattr(self._v_lookup, name)
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def changed(self, originally_changed):
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self._generation += 1
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self._v_lookup.changed(originally_changed)
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def register(self, required, provided, name, value):
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if not isinstance(name, STRING_TYPES):
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raise ValueError('name is not a string')
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if value is None:
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self.unregister(required, provided, name, value)
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return
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required = tuple(map(_convert_None_to_Interface, required))
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name = _normalize_name(name)
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order = len(required)
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byorder = self._adapters
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while len(byorder) <= order:
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byorder.append({})
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components = byorder[order]
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key = required + (provided,)
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for k in key:
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d = components.get(k)
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if d is None:
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d = {}
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components[k] = d
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components = d
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if components.get(name) is value:
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return
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components[name] = value
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n = self._provided.get(provided, 0) + 1
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self._provided[provided] = n
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if n == 1:
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self._v_lookup.add_extendor(provided)
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self.changed(self)
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def registered(self, required, provided, name=_BLANK):
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required = tuple(map(_convert_None_to_Interface, required))
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name = _normalize_name(name)
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order = len(required)
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byorder = self._adapters
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if len(byorder) <= order:
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return None
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components = byorder[order]
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key = required + (provided,)
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for k in key:
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d = components.get(k)
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if d is None:
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return None
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components = d
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return components.get(name)
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def unregister(self, required, provided, name, value=None):
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required = tuple(map(_convert_None_to_Interface, required))
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order = len(required)
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byorder = self._adapters
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if order >= len(byorder):
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return False
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components = byorder[order]
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key = required + (provided,)
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# Keep track of how we got to `components`:
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lookups = []
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for k in key:
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d = components.get(k)
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if d is None:
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return
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lookups.append((components, k))
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components = d
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old = components.get(name)
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if old is None:
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return
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if (value is not None) and (old is not value):
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return
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del components[name]
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if not components:
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# Clean out empty containers, since we don't want our keys
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# to reference global objects (interfaces) unnecessarily.
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# This is often a problem when an interface is slated for
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# removal; a hold-over entry in the registry can make it
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# difficult to remove such interfaces.
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for comp, k in reversed(lookups):
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d = comp[k]
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if d:
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break
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else:
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del comp[k]
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while byorder and not byorder[-1]:
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del byorder[-1]
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n = self._provided[provided] - 1
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if n == 0:
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del self._provided[provided]
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self._v_lookup.remove_extendor(provided)
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else:
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self._provided[provided] = n
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self.changed(self)
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def subscribe(self, required, provided, value):
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required = tuple(map(_convert_None_to_Interface, required))
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name = _BLANK
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order = len(required)
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byorder = self._subscribers
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while len(byorder) <= order:
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byorder.append({})
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components = byorder[order]
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key = required + (provided,)
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for k in key:
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d = components.get(k)
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if d is None:
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d = {}
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components[k] = d
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components = d
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components[name] = components.get(name, ()) + (value, )
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if provided is not None:
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n = self._provided.get(provided, 0) + 1
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self._provided[provided] = n
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if n == 1:
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self._v_lookup.add_extendor(provided)
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self.changed(self)
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def unsubscribe(self, required, provided, value=None):
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required = tuple(map(_convert_None_to_Interface, required))
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order = len(required)
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byorder = self._subscribers
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if order >= len(byorder):
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return
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components = byorder[order]
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key = required + (provided,)
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# Keep track of how we got to `components`:
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lookups = []
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for k in key:
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d = components.get(k)
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if d is None:
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return
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lookups.append((components, k))
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components = d
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old = components.get(_BLANK)
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if not old:
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# this is belt-and-suspenders against the failure of cleanup below
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return # pragma: no cover
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if value is None:
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new = ()
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else:
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new = tuple([v for v in old if v is not value])
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if new == old:
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return
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if new:
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components[_BLANK] = new
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else:
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# Instead of setting components[_BLANK] = new, we clean out
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# empty containers, since we don't want our keys to
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# reference global objects (interfaces) unnecessarily. This
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# is often a problem when an interface is slated for
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# removal; a hold-over entry in the registry can make it
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# difficult to remove such interfaces.
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del components[_BLANK]
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for comp, k in reversed(lookups):
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d = comp[k]
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if d:
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break
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else:
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del comp[k]
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while byorder and not byorder[-1]:
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del byorder[-1]
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if provided is not None:
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n = self._provided[provided] + len(new) - len(old)
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if n == 0:
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del self._provided[provided]
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self._v_lookup.remove_extendor(provided)
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self.changed(self)
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# XXX hack to fake out twisted's use of a private api. We need to get them
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# to use the new registed method.
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def get(self, _): # pragma: no cover
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class XXXTwistedFakeOut:
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selfImplied = {}
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return XXXTwistedFakeOut
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_not_in_mapping = object()
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class LookupBaseFallback(object):
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def __init__(self):
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self._cache = {}
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self._mcache = {}
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self._scache = {}
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def changed(self, ignored=None):
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self._cache.clear()
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self._mcache.clear()
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self._scache.clear()
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def _getcache(self, provided, name):
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cache = self._cache.get(provided)
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if cache is None:
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cache = {}
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self._cache[provided] = cache
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if name:
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c = cache.get(name)
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if c is None:
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c = {}
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cache[name] = c
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cache = c
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return cache
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def lookup(self, required, provided, name=_BLANK, default=None):
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if not isinstance(name, STRING_TYPES):
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raise ValueError('name is not a string')
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cache = self._getcache(provided, name)
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required = tuple(required)
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if len(required) == 1:
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result = cache.get(required[0], _not_in_mapping)
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else:
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result = cache.get(tuple(required), _not_in_mapping)
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if result is _not_in_mapping:
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result = self._uncached_lookup(required, provided, name)
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if len(required) == 1:
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cache[required[0]] = result
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else:
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cache[tuple(required)] = result
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if result is None:
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return default
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return result
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def lookup1(self, required, provided, name=_BLANK, default=None):
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if not isinstance(name, STRING_TYPES):
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raise ValueError('name is not a string')
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cache = self._getcache(provided, name)
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result = cache.get(required, _not_in_mapping)
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if result is _not_in_mapping:
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return self.lookup((required, ), provided, name, default)
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if result is None:
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return default
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return result
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def queryAdapter(self, object, provided, name=_BLANK, default=None):
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return self.adapter_hook(provided, object, name, default)
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def adapter_hook(self, provided, object, name=_BLANK, default=None):
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if not isinstance(name, STRING_TYPES):
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raise ValueError('name is not a string')
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required = providedBy(object)
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cache = self._getcache(provided, name)
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factory = cache.get(required, _not_in_mapping)
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if factory is _not_in_mapping:
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factory = self.lookup((required, ), provided, name)
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if factory is not None:
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result = factory(object)
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if result is not None:
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return result
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return default
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def lookupAll(self, required, provided):
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cache = self._mcache.get(provided)
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if cache is None:
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cache = {}
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self._mcache[provided] = cache
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required = tuple(required)
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result = cache.get(required, _not_in_mapping)
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if result is _not_in_mapping:
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result = self._uncached_lookupAll(required, provided)
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cache[required] = result
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return result
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def subscriptions(self, required, provided):
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cache = self._scache.get(provided)
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if cache is None:
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cache = {}
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self._scache[provided] = cache
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required = tuple(required)
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result = cache.get(required, _not_in_mapping)
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if result is _not_in_mapping:
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result = self._uncached_subscriptions(required, provided)
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cache[required] = result
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return result
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LookupBasePy = LookupBaseFallback # BBB
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try:
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from ._zope_interface_coptimizations import LookupBase
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except ImportError:
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LookupBase = LookupBaseFallback
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class VerifyingBaseFallback(LookupBaseFallback):
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# Mixin for lookups against registries which "chain" upwards, and
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# whose lookups invalidate their own caches whenever a parent registry
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# bumps its own '_generation' counter. E.g., used by
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# zope.component.persistentregistry
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def changed(self, originally_changed):
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LookupBaseFallback.changed(self, originally_changed)
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self._verify_ro = self._registry.ro[1:]
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self._verify_generations = [r._generation for r in self._verify_ro]
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def _verify(self):
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if ([r._generation for r in self._verify_ro]
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!= self._verify_generations):
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self.changed(None)
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def _getcache(self, provided, name):
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self._verify()
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return LookupBaseFallback._getcache(self, provided, name)
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def lookupAll(self, required, provided):
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self._verify()
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return LookupBaseFallback.lookupAll(self, required, provided)
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def subscriptions(self, required, provided):
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self._verify()
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return LookupBaseFallback.subscriptions(self, required, provided)
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VerifyingBasePy = VerifyingBaseFallback #BBB
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try:
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from ._zope_interface_coptimizations import VerifyingBase
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except ImportError:
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VerifyingBase = VerifyingBaseFallback
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class AdapterLookupBase(object):
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def __init__(self, registry):
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self._registry = registry
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self._required = {}
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self.init_extendors()
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super(AdapterLookupBase, self).__init__()
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def changed(self, ignored=None):
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super(AdapterLookupBase, self).changed(None)
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for r in self._required.keys():
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r = r()
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if r is not None:
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r.unsubscribe(self)
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|
|
self._required.clear()
|
|
|
|
|
|
|
|
|
# Extendors
|
|
|
# ---------
|
|
|
|
|
|
# When given an target interface for an adapter lookup, we need to consider
|
|
|
# adapters for interfaces that extend the target interface. This is
|
|
|
# what the extendors dictionary is about. It tells us all of the
|
|
|
# interfaces that extend an interface for which there are adapters
|
|
|
# registered.
|
|
|
|
|
|
# We could separate this by order and name, thus reducing the
|
|
|
# number of provided interfaces to search at run time. The tradeoff,
|
|
|
# however, is that we have to store more information. For example,
|
|
|
# if the same interface is provided for multiple names and if the
|
|
|
# interface extends many interfaces, we'll have to keep track of
|
|
|
# a fair bit of information for each name. It's better to
|
|
|
# be space efficient here and be time efficient in the cache
|
|
|
# implementation.
|
|
|
|
|
|
# TODO: add invalidation when a provided interface changes, in case
|
|
|
# the interface's __iro__ has changed. This is unlikely enough that
|
|
|
# we'll take our chances for now.
|
|
|
|
|
|
def init_extendors(self):
|
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|
self._extendors = {}
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|
for p in self._registry._provided:
|
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|
self.add_extendor(p)
|
|
|
|
|
|
def add_extendor(self, provided):
|
|
|
_extendors = self._extendors
|
|
|
for i in provided.__iro__:
|
|
|
extendors = _extendors.get(i, ())
|
|
|
_extendors[i] = (
|
|
|
[e for e in extendors if provided.isOrExtends(e)]
|
|
|
+
|
|
|
[provided]
|
|
|
+
|
|
|
[e for e in extendors if not provided.isOrExtends(e)]
|
|
|
)
|
|
|
|
|
|
def remove_extendor(self, provided):
|
|
|
_extendors = self._extendors
|
|
|
for i in provided.__iro__:
|
|
|
_extendors[i] = [e for e in _extendors.get(i, ())
|
|
|
if e != provided]
|
|
|
|
|
|
|
|
|
def _subscribe(self, *required):
|
|
|
_refs = self._required
|
|
|
for r in required:
|
|
|
ref = r.weakref()
|
|
|
if ref not in _refs:
|
|
|
r.subscribe(self)
|
|
|
_refs[ref] = 1
|
|
|
|
|
|
def _uncached_lookup(self, required, provided, name=_BLANK):
|
|
|
required = tuple(required)
|
|
|
result = None
|
|
|
order = len(required)
|
|
|
for registry in self._registry.ro:
|
|
|
byorder = registry._adapters
|
|
|
if order >= len(byorder):
|
|
|
continue
|
|
|
|
|
|
extendors = registry._v_lookup._extendors.get(provided)
|
|
|
if not extendors:
|
|
|
continue
|
|
|
|
|
|
components = byorder[order]
|
|
|
result = _lookup(components, required, extendors, name, 0,
|
|
|
order)
|
|
|
if result is not None:
|
|
|
break
|
|
|
|
|
|
self._subscribe(*required)
|
|
|
|
|
|
return result
|
|
|
|
|
|
def queryMultiAdapter(self, objects, provided, name=_BLANK, default=None):
|
|
|
factory = self.lookup(map(providedBy, objects), provided, name)
|
|
|
if factory is None:
|
|
|
return default
|
|
|
|
|
|
result = factory(*objects)
|
|
|
if result is None:
|
|
|
return default
|
|
|
|
|
|
return result
|
|
|
|
|
|
def _uncached_lookupAll(self, required, provided):
|
|
|
required = tuple(required)
|
|
|
order = len(required)
|
|
|
result = {}
|
|
|
for registry in reversed(self._registry.ro):
|
|
|
byorder = registry._adapters
|
|
|
if order >= len(byorder):
|
|
|
continue
|
|
|
extendors = registry._v_lookup._extendors.get(provided)
|
|
|
if not extendors:
|
|
|
continue
|
|
|
components = byorder[order]
|
|
|
_lookupAll(components, required, extendors, result, 0, order)
|
|
|
|
|
|
self._subscribe(*required)
|
|
|
|
|
|
return tuple(result.items())
|
|
|
|
|
|
def names(self, required, provided):
|
|
|
return [c[0] for c in self.lookupAll(required, provided)]
|
|
|
|
|
|
def _uncached_subscriptions(self, required, provided):
|
|
|
required = tuple(required)
|
|
|
order = len(required)
|
|
|
result = []
|
|
|
for registry in reversed(self._registry.ro):
|
|
|
byorder = registry._subscribers
|
|
|
if order >= len(byorder):
|
|
|
continue
|
|
|
|
|
|
if provided is None:
|
|
|
extendors = (provided, )
|
|
|
else:
|
|
|
extendors = registry._v_lookup._extendors.get(provided)
|
|
|
if extendors is None:
|
|
|
continue
|
|
|
|
|
|
_subscriptions(byorder[order], required, extendors, _BLANK,
|
|
|
result, 0, order)
|
|
|
|
|
|
self._subscribe(*required)
|
|
|
|
|
|
return result
|
|
|
|
|
|
def subscribers(self, objects, provided):
|
|
|
subscriptions = self.subscriptions(map(providedBy, objects), provided)
|
|
|
if provided is None:
|
|
|
result = ()
|
|
|
for subscription in subscriptions:
|
|
|
subscription(*objects)
|
|
|
else:
|
|
|
result = []
|
|
|
for subscription in subscriptions:
|
|
|
subscriber = subscription(*objects)
|
|
|
if subscriber is not None:
|
|
|
result.append(subscriber)
|
|
|
return result
|
|
|
|
|
|
class AdapterLookup(AdapterLookupBase, LookupBase):
|
|
|
pass
|
|
|
|
|
|
@implementer(IAdapterRegistry)
|
|
|
class AdapterRegistry(BaseAdapterRegistry):
|
|
|
|
|
|
LookupClass = AdapterLookup
|
|
|
|
|
|
def __init__(self, bases=()):
|
|
|
# AdapterRegisties are invalidating registries, so
|
|
|
# we need to keep track of out invalidating subregistries.
|
|
|
self._v_subregistries = weakref.WeakKeyDictionary()
|
|
|
|
|
|
super(AdapterRegistry, self).__init__(bases)
|
|
|
|
|
|
def _addSubregistry(self, r):
|
|
|
self._v_subregistries[r] = 1
|
|
|
|
|
|
def _removeSubregistry(self, r):
|
|
|
if r in self._v_subregistries:
|
|
|
del self._v_subregistries[r]
|
|
|
|
|
|
def _setBases(self, bases):
|
|
|
old = self.__dict__.get('__bases__', ())
|
|
|
for r in old:
|
|
|
if r not in bases:
|
|
|
r._removeSubregistry(self)
|
|
|
for r in bases:
|
|
|
if r not in old:
|
|
|
r._addSubregistry(self)
|
|
|
|
|
|
super(AdapterRegistry, self)._setBases(bases)
|
|
|
|
|
|
def changed(self, originally_changed):
|
|
|
super(AdapterRegistry, self).changed(originally_changed)
|
|
|
|
|
|
for sub in self._v_subregistries.keys():
|
|
|
sub.changed(originally_changed)
|
|
|
|
|
|
|
|
|
class VerifyingAdapterLookup(AdapterLookupBase, VerifyingBase):
|
|
|
pass
|
|
|
|
|
|
@implementer(IAdapterRegistry)
|
|
|
class VerifyingAdapterRegistry(BaseAdapterRegistry):
|
|
|
|
|
|
LookupClass = VerifyingAdapterLookup
|
|
|
|
|
|
def _convert_None_to_Interface(x):
|
|
|
if x is None:
|
|
|
return Interface
|
|
|
else:
|
|
|
return x
|
|
|
|
|
|
def _lookup(components, specs, provided, name, i, l):
|
|
|
if i < l:
|
|
|
for spec in specs[i].__sro__:
|
|
|
comps = components.get(spec)
|
|
|
if comps:
|
|
|
r = _lookup(comps, specs, provided, name, i+1, l)
|
|
|
if r is not None:
|
|
|
return r
|
|
|
else:
|
|
|
for iface in provided:
|
|
|
comps = components.get(iface)
|
|
|
if comps:
|
|
|
r = comps.get(name)
|
|
|
if r is not None:
|
|
|
return r
|
|
|
|
|
|
return None
|
|
|
|
|
|
def _lookupAll(components, specs, provided, result, i, l):
|
|
|
if i < l:
|
|
|
for spec in reversed(specs[i].__sro__):
|
|
|
comps = components.get(spec)
|
|
|
if comps:
|
|
|
_lookupAll(comps, specs, provided, result, i+1, l)
|
|
|
else:
|
|
|
for iface in reversed(provided):
|
|
|
comps = components.get(iface)
|
|
|
if comps:
|
|
|
result.update(comps)
|
|
|
|
|
|
def _subscriptions(components, specs, provided, name, result, i, l):
|
|
|
if i < l:
|
|
|
for spec in reversed(specs[i].__sro__):
|
|
|
comps = components.get(spec)
|
|
|
if comps:
|
|
|
_subscriptions(comps, specs, provided, name, result, i+1, l)
|
|
|
else:
|
|
|
for iface in reversed(provided):
|
|
|
comps = components.get(iface)
|
|
|
if comps:
|
|
|
comps = comps.get(name)
|
|
|
if comps:
|
|
|
result.extend(comps)
|
|
|
|
