+
+class specslot(object):
+ __slots__ = ["nm", "idx", "dirty"]
+ unbound = object()
+
+ def __init__(self, nm, idx, dirty):
+ self.nm = nm
+ self.idx = idx
+ self.dirty = dirty
+
+ @staticmethod
+ def slist(ins):
+ # Avoid calling __getattribute__
+ return specdirty.__sslots__.__get__(ins, type(ins))
+
+ def __get__(self, ins, cls):
+ val = self.slist(ins)[self.idx]
+ if val is specslot.unbound:
+ raise AttributeError("specslot %r is unbound" % self.nm)
+ return val
+
+ def __set__(self, ins, val):
+ self.slist(ins)[self.idx] = val
+ if self.dirty:
+ ins.dirty()
+
+ def __delete__(self, ins):
+ self.slist(ins)[self.idx] = specslot.unbound
+ ins.dirty()
+
+class specclass(type):
+ def __init__(self, name, bases, tdict):
+ super(specclass, self).__init__(name, bases, tdict)
+ sslots = set()
+ dslots = set()
+ for cls in self.__mro__:
+ css = cls.__dict__.get("__saveslots__", ())
+ sslots.update(css)
+ dslots.update(cls.__dict__.get("__dirtyslots__", css))
+ self.__sslots_l__ = list(sslots)
+ self.__sslots_a__ = list(sslots | dslots)
+ for i, slot in enumerate(self.__sslots_a__):
+ setattr(self, slot, specslot(slot, i, slot in dslots))
+
+class specdirty(sessiondata):
+ __metaclass__ = specclass
+ __slots__ = ["session", "__sslots__", "_is_dirty"]
+
+ def __specinit__(self):
+ pass
+
+ @staticmethod
+ def __new__(cls, req, sess):
+ self = super(specdirty, cls).__new__(cls)
+ self.session = sess
+ self.__sslots__ = [specslot.unbound] * len(cls.__sslots_a__)
+ self.__specinit__()
+ self._is_dirty = False
+ return self
+
+ def __getnewargs__(self):
+ return (None, self.session)
+
+ def dirty(self):
+ self._is_dirty = True
+
+ def sessfrozen(self):
+ self._is_dirty = False
+
+ def sessdirty(self):
+ return self._is_dirty
+
+ def __getstate__(self):
+ ret = {}
+ for nm, val in zip(type(self).__sslots_a__, specslot.slist(self)):
+ if val is specslot.unbound:
+ ret[nm] = False, None
+ else:
+ ret[nm] = True, val
+ return ret
+
+ def __setstate__(self, st):
+ ss = specslot.slist(self)
+ for i, nm in enumerate(type(self).__sslots_a__):
+ bound, val = st.pop(nm, (False, None))
+ print i, nm, bound, val
+ if not bound:
+ ss[i] = specslot.unbound
+ else:
+ ss[i] = val