The biggest problem I see with storing the value at a class/module level is you really need to make sure you clean up after yourself, otherwise the value may still be set when the next request is processed and that value may not be appropriate.
I would personally always grab/cache values in request object, memcache, and or session as appropriate. That way there is no danger of exposing data to other requests. But hey, if you want to use module level caches go for it. I have been running appengine projects ever since it was released and started out with some module level cache, and regretted it ever since. It was has proven to be difficult ensure the cache has been cleaned up, where as memcahce you can control out of process. (You can't shut an instance down if it has an error and you can't remove a value from a module cache) Rgds T On Jul 29, 4:19 pm, Bill Edwards <twmaf...@gmail.com> wrote: > Hey guys, > > Is it horrible to use global variables? I am currently executing a > query at the beginning of my handler and storing the query result > within class object A. I subsequently need to access the query result > within multiple different class objects, say B, C, and D. It has been > recommended to me to cache object A in the request object, but i need > to access the variable from within various class objects, so I'm > finding that I have to pass the object A in to the constructor for > every new object i define, and then sync any changed state of object A > with the handler's version of object A when the various class object > functions are completed. > > So it really seems like the simplest way to do things is to just > define a global variable. Is there a better option? Can I think I > would ideally want to create something liek a session object to store > the global object. > > Thanks! > Bill -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
