i dont think theres anything intrinsic about custom InstrumentationManager that would change weakref behavior, they live at the class level and shouldn't change anything about instances. let me know what you mean by "identity map changing size".
nicholas wrote: > > I am looking at using the InstrumentationManager to add > AttributeExtension's to my objects. > I am using Elixir 0.6, SQL Alchemy 0.5.3 > > From what I can gather, I need to add > '__sa_instrumentation_manager__' all my mapped classes. > > Currently, with using the Elixir Metaclass, I have one class that is > the root of them all, but which is not mapped. > > Something like the following: > > > class ElementInstrumentationManager(InstrumentationManager): > def __init__(self, class_): > self.class_ = class_ > > def post_configure_attribute(self, class_, key, instr_attr): > pass > > > class Element(object) > __metaclass__ = ElixirMeta > __sa_instrumentation_manager__ = ElementInstrumentationManager > > > > It seems as soon as I add __sa_instrumentation_manager__ = > ElementInstrumentationManager > I begin to have problems with the session identity_map changing size. > Since this is single threaded, I can only assume that I am fighting > with the GC, and the WeakRef Map. > > (I can turn off the weak_ref identity map, but that seems to have > other side-effects that I am not totally aware. > That is one solution, but I want to understand the current problem > before I go there, if possible) > > I have been reading the code in session.py, identity.py, and > attribute.py. I am beginning to get the gist. Kinda. > > Anyone seen this before and have an obvious answer. > It kinda seems that the default ClassMananger and the wrapped > InstrumentationManager aren't really interchangable. > > > > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
