On Jul 30, 8:47 pm, Ikai L (Google) ika...@google.com wrote:
it sounded like he wanted to do it on
a per query basis - and there'd be all the problems with global mutable
state, concurrency, etc.
Just for the sake of completeness, this case is usually implemented
using a static ThreadLocal
Hi Stephen,
I hope I wasn't perceived as someone trying to be right. I was only trying
to prevent other readers from being misinformed.
Modern programming languages offer a lot of useful 'tools' that empower the
kinds of programming constructs that at one time were only dreamed of. It
would be
I'm not sure what you mean by 'globals'. Static fields are not global - they
must be referenced using a class name.
On Fri, Jul 30, 2010 at 1:23 PM, Ikai L (Google) ika...@google.com wrote:
I avoided this thread because I wanted to see some code first. It sounded
like the original poster
I avoided this thread because I wanted to see some code first. It sounded
like the original poster wanted to use globals in a non-thread safe way.
Statics are not a bad thing, but using globals to pass state around that is
only useful in local scope is very, very bad.
On Fri, Jul 30, 2010 at
A static isn't global, but in the OP's use case, it's way out of the scope
of what he needs to do, which is to pass around objects. Rather than passing
the object around, it sounded like he just wanted to stash the object into
global/static scope and pull it out. There are certainly use cases for
Yup, yup!
I'd bet there's a good design pattern for this.
I'd really like to see more online docs specifically dealing with design
pattern implementations geared towards the different aspects and intricacies
of appengine. The docs could even be tied via links to some of the great
Google IO
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
Hi Tim.
Help me out here 'cause I don't understand what problem you see with storing
a value in a static field?
As far as I know (and I am limiting my discussion here to Java and servlets)
objects are not persisted across http requests unless they are serializable
and stored in session or in
Hi
On Jul 29, 8:40 pm, Jeff Schwartz jefftschwa...@gmail.com wrote:
Hi Tim.
Help me out here 'cause I don't understand what problem you see with storing
a value in a static field?
Wouldn't have a clue. I don't use java on appengine. You didn't
mention in your original
post you where
I wasn't the original poster but I was curious about your caution regarding
class static fields.
Which Python framework are you using if you don't mind me asking?
Jeff
On Thu, Jul 29, 2010 at 10:49 AM, Tim Hoffman zutes...@gmail.com wrote:
Hi
On Jul 29, 8:40 pm, Jeff Schwartz
Hi
On Jul 29, 11:32 pm, Jeff Schwartz jefftschwa...@gmail.com wrote:
I wasn't the original poster but I was curious about your caution regarding
class static fields.
Sorry missed that. Having not done any development with java on
appengine all my development (and hence statements about module
Hi Jeff (and possible Bill if you're using Java and not Python (not
sure from the question since I don't know Python))
(Assuming Java) Using static variables could cause all kinds of
trouble if proper care is not taken to limit their accessibility since
they are shared and all requests that are
Stephen
With all due respect, you are stating the obvious and the use case you
present is like a text book example of last in first out/race ahead
condition. Perhaps if the coder had declared the static variable final and
initialized it in a static constructor it would have prevented multiple
Yes Jeff, you are correct, constant values are safe to use.
On Jul 29, 7:23 pm, Jeff Schwartz jefftschwa...@gmail.com wrote:
Stephen
With all due respect, you are stating the obvious and the use case you
present is like a text book example of last in first out/race ahead
condition. Perhaps
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