Hello.
On 10.6.2013 18:41, Michael Bayer wrote: > > On Jun 10, 2013, at 11:46 AM, Ladislav Lenart <lenart...@volny.cz> wrote: > >> >> I have no idea what is wrong. Please help me diagnose this! Note that OS >> monitor >> shows several cherrypy threads, each gets its share, so the cherrypy setup >> seems >> to be OK. >> class _SessionContext(object): >> def __init__(self): >> self._level = 0 >> >> def __enter__(self): >> if self._level == 0: >> self._session = _Session() >> self._level += 1 >> return self._session >> >> def __exit__(self, type_, value, traceback): >> self._level -= 1 >> if self._level == 0: >> self._session.close() >> self._session = None >> >> _thread_local = local() >> >> def get_session(): >> ctx = getattr(_thread_local, 'session_context', None) >> if ctx: >> return ctx >> ctx = _SessionContext() >> _thread_local.session_context = ctx >> return ctx > > > what's all this thread local stuff for? The problem is likely there, a > scoped_session() already uses a threading.local. A very simple usage > pattern should work fine. Just put a "session.remove()" type of thing to > occur at the end of each request. guidelines are here: > http://docs.sqlalchemy.org/en/rel_0_8/orm/session.html#using-thread-local-scope-with-web-applications > Well, this is our way to call Session.remove() at the end of the request processing. get_session() creates _SessionContext instance (a python context manager) responsible for closing the session at the end. We use scoped_session() and we wanted to support nesting like this: with get_session(): with get_session(): ... Hence we create only one _SessionContext per thread. It increments its internal counter whenever its __enter__() is called and decrements it whenever its __exit__() is called. It closes the session when the counter reaches zero. The decorator @session.use wraps the function in the call with get_session(): We mark every method of our handler that needs to access a database with this decorator. It is always the top level decorator, i.e.: @session.use @other_decorator def foo(): pass I will investigate further and let you know. Thank you, Ladislav Lenart -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
