logging and propagation

[oj]

On Nov 22, 5:44 am, Vinay Sajip <vinay_sa... at yahoo.co.uk> wrote:
> On Nov 21, 11:38 am, oj <ojee... at gmail.com> wrote:
>
>
>
> > Hi,
>
> > I want to setuploggingwith two loggers:
>
> > The child logger is used when something different needs to be done
> > with the log record, and the log record will propagate and be logged
> > by the root logger as usual.
>
> > However, there are certain times when I don't want a log record to
> > propagate from the child to the parent.
>
> > I don't really want to add a filter to the root logger, as it should
> > be up to the child whether the record propagates or not.
>
> > I've tried setting the child to a lower level then the parent, but if
> > a record is dealt with by the child, the parent deals with it anyway
> > regardless of its own log level.
>
> > Also, filters only apply particular handlers and do not affect
> > propagation.
>
> > Can anyone suggest a simple way to achieve this?
>
> > Currently, the only thing I can think of, is overriding the
> > callHandlers method in a custom Logger class.
>
> Do you already have a Logger subclass? Where and when is the decision
> being made about whether to propagate or not?

The decision is being made in a filter. Certain log records are dealt
with differently from there.

The filter also prevents the handler from dealing with those log
records, but it doesn't stop the handlers of parent loggers dealing
with them.