Hey JP - we were trying to do something very similar ourselves, where we
were trying to create a logger-per-instance. The trick is not to use
logging.getLogger, but to just create an instance of the class directly.
Here's a small wrapper method we use:
def uniqueLogger(name, parent=None):
'''Retrieve a unique logger.
Using logging.getLogger will reuse loggers if the same name is given;
however, in some cases (for instance, we want a logger per instance of a
class) this is not desirable, and we always want a unique logger.'''
logger = logging.getLoggerClass()(name)
if parent is not None:
# Since we're not using getLogger, need to set parent ourselves...
logger.parent = parent
return logger
On Mon, Jul 15, 2013 at 8:21 PM, John Patrick <[email protected]> wrote:
> Hey all,
>
> Let's say I have an class called Model, and a class called View. The view
> instance collects lots of Model instances and as the user manipulates the
> models, the view is updated. In this case, one thing I want to have in the
> view is a text area where my model objects can display messages as they are
> manipulated, both for debugging and for user feedback.
>
> I wanted to set this up by adding a logger instance to each Model instance
> in it's __init__ method, so that other methods can call it to output
> messages:
>
> Model(object):
> def __init__(self):
> self.logger = logging.getLogger(self.__class__.__name__) #or whatever
>
> inst_a = Model()
> inst_b = Model()
>
>
> The problem is that I want to connect and disconnect the different model
> object's loggers to different text widgets (via a special handler),
> filehandlers, etc. Loggers are cached by name, though, so now each of my
> instances are sharing pointers to the same logger.
>
> So - AFAIK, I have to do something like use a uuid in my getLogger call
> to use the Logger class. This feels like an abuse of how loggers are
> designed to work, and since the logging module seems to cache instances,
> I'm concerned about memory leaks. Especially in a Maya situation where a
> user has a long-running Python process.
>
> Has anyone had a similar experience and found a clean solution for this
> problem? Really, I'd just like a non-cached logger instance. The docs
> lead me to believe it's not possible, but this seems like it would be a
> fairly common scenario.
>
> Thanks!
> JP
>
>
>
>
>
>
> --
> John Patrick
> 404-242-2675
> [email protected]
> http://www.canyourigit.com
>
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