Commit f0dfffa6 authored by Jérome Perrin's avatar Jérome Perrin

lazy_class: WIP new metaclass

parent 4674fc09
......@@ -22,44 +22,6 @@ from . import persistent_migration
from ZODB.POSException import ConflictError
import six
if six.PY2:
class ERP5BaseBroken_(Broken, ERP5Base, PersistentBroken):
pass
else:
class ERP5BaseBroken_(ERP5Base, PersistentBroken):
pass
class ERP5BaseBroken(ERP5BaseBroken_):
# PersistentBroken can't be reused directly
# because its « layout differs from 'GhostPortalType' »
# This prevents serialize (ZODB) from reloading the class during commit
# (which would look for __Broken_newargs__ which is not present)
__getnewargs__ = None
def __metaclass__(name, base, d):
d = dict(PersistentBroken.__dict__, **d)
for x in '__dict__', '__metaclass__', '__weakref__':
del d[x]
def get(x):
def get(self):
d = self.__dict__
try:
return d.get('__Broken_state__', d)[x]
except KeyError:
return getattr(self.__class__, x)
return property(get)
for x in 'id', 'title':
d[x] = get(x)
return type(name, base, d)
def __getattr__(self, name):
try:
return self.__dict__['__Broken_state__'][name]
# TypeError: SynchronizationTool => SynchronisationTool
except (KeyError, TypeError):
raise AttributeError("state of broken %r object has no %r key"
% (self.__class__.__name__, name))
# the meta class of a derived class must be a subclass of all of its bases:
# since a portal type derives from both Zope Extension classes and
......@@ -399,3 +361,38 @@ def generateLazyPortalTypeClass(portal_type_name):
return PortalTypeMetaClass(portal_type_name,
(InitGhostBase,),
dict(portal_type=portal_type_name))
class ERP5BaseBrokenMetaClass(PortalTypeMetaClass):
def __new__(cls, name, bases, d):
d = dict(PersistentBroken.__dict__, **d)
for x in '__dict__', '__weakref__':
del d[x]
if six.PY2:
del d['__metaclass__']
def get(x):
def get(self):
d = self.__dict__
try:
return d.get('__Broken_state__', d)[x]
except KeyError:
return getattr(self.__class__, x)
return property(get)
for x in 'id', 'title':
d[x] = get(x)
return super(ERP5BaseBrokenMetaClass, cls).__new__(cls, name, bases, d)
class ERP5BaseBroken(six.with_metaclass(ERP5BaseBrokenMetaClass, Broken, ERP5Base, PersistentBroken)):
# This prevents serialize (ZODB) from reloading the class during commit
# (which would look for __Broken_newargs__ which is not present)
__getnewargs__ = None
def __getattr__(self, name):
try:
return self.__dict__['__Broken_state__'][name]
# TypeError: SynchronizationTool => SynchronisationTool
except (KeyError, TypeError):
raise AttributeError("state of broken %r object has no %r key"
% (self.__class__.__name__, name))
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