I was just looking over Bill Katz' counter code (
http://billkatz.com/2008/10/Fault-tolerant-counters-for-App-Engine )
and had a question about a reasonable pattern for using it in the
following situation:
- I want to count daily usage in certain parts of my site by each
user.
Right now I have a UserStats model which has the user, the date, and a
reference to a counter. Previously I was using a more simplistic
sharded counter that was based on the db.Model, rather than a python
object, so in my UserStats model I could write a simple method called
get_daily_counter to get counter results for the day with a line like
this:
def get_daily_counter(self, counter_key):
return Counter.get_or_insert(counter_key, name=counter_key)
The above would create the counter entity for the day if it didn't
exist, and then I could get the count, in my view.
With the new code, we have a python object rather than a model I can
get_or_insert, so I am wondering if the following seems like a
reasonable pattern for GAE:
def get_daily_counter(self, counter_key):
if not counter_key in vars().keys():
vars()[counter_key] = Counter(counter_name)
return vars()[counter_key]
If not, is there a recommended way for implementing this counter such
that it gets instantiated if not already in existence, and returned
appropriately if so?
Thanks,
-Josh
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