Hi Massimo, In the first post of this thread, Arturo said,
"Is there a way in web2py to have varibles be persistent. For example when I instantiate a class I don't want to re-instantiate it every time a page is loaded." I guess what he concerns is performance. In other word, "web2py re- instantiate all class, variables, app logics, etc. ... every time a page is loaded. Isn't that sounds slow?" Do we have a doc for this faq? By the way, does binary compiling a web2py app help much in this aspect? Regards, Ray On Oct 30, 10:40 pm, Massimo Di Pierro <massimo.dipie...@gmail.com> wrote: > this is not a web2py issue. This is an issue for all web applications. > > What if your application is replicated on two server behing a load > balancer? The two servers cannot share objects. What if you use a web > servers that forks (apache can) than different requests are executed > by different processes, not different threads? Processes cannot share > objects. What if you have to restart the web server for maintenance > purposes? Do you want to store all persistent data? > The same user may request two pages and these two pages may be server > by different servers or different processes. > > Web applications must be written without persistent objects. State is > share using the database, using sessions and using cache. > > The bahvior you seek can be mimicked by serializing/deserializing the > objects at every request in session or cache. > > Massimo > > On Oct 30, 4:39 am, evilaliv3 <evilal...@gmail.com> wrote: > > > > > > > > > On 30 Ott, 00:39, Massimo Di Pierro <massimo.dipie...@gmail.com> > > wrote: > > > > You must use cache.ram but this is not guaranteed to work. > > > Excuse me Massimo, > > but, if i understand well this answer, there is no way to have also a > > persistent connection to the database or a global application variable > > in web2py? > > for every request the whole application is reinitialized? > > > > In a multi-threaded environment the web server decides which threads > > > to start/stop/kill. > > > does this happen in a deterministic fashion? is there some > > documentation about? > > > Giovanni Pellerano
