On 3/22/06, Julian Tillmann <[EMAIL PROTECTED]> wrote:
> Hi
>
> Can someone give me advice how to control and clean
>
> the amount of Collections (HashTables/ArrayList)
>
> that are stored in the session.
If you do find you need collections stored in httpsession, i wouldn't
use hashtable.
>
> My first consideration goes in the direction to
>
> use a naming-strategy for all lists to be used in a session
>
> (eg session.setAttribute("collection_name",
>
> and always when an action is executed
>
> to look
>
> for all parameters if session.getAttribute.equals("collection_name
>
> and to remove all last Action's Collection_data in order to minimalize my
>
> session data.
>
>
>
> Regarding to you, does it make sense to control the session-size
>
> within a struts application this way.
The size of the session can effect clustering, and is also expensive
in a standalone envionment. But that aside it becomes harder to
maintain applications when developers are using session at each and
every oppertunity. You can use a session attribute listener to see
where things are being added, but life is generally easier if session
is used as little as possible. I recently worked on some legacy apps
where session had been used over liberally and performance issues
aside you couldn't work out what the state the application was in.
For data you need to store across lots of requests, you can create a
simple javaclass to hold the data you need. Something like a StateBean
or even a hashmap, the point is that if you have one object that your
storing things in you know where to look if and when you find you need
to address session size. If you have folk adding the world into the
session all over the place, its going to be harder to address any
issues later in the day. e.g. Map state = (Map)
session.getAttribute("state")
Your post will probably provoke some fanaticism claiming "sessions are
evil" , "never use sessions" and such like. IMO you want to use it as
little as possible, and when you do know where its been used.
I guess the question is, what are you thinking of putting in your session?
Mark
>
>
>
> Thanks a lot for your opinion!!
>
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