Wow it is amazing how S2 can be used.
This is a use of interceptor I've never seen before.
IMHO, I think it is too much trouble to declare an xxxAware interface
and an xxxInterceptor to just share the same database data across
multiple pages. I would stick to store the data in session or
application scope. You have available the SessionAware and
ApplicationAware interfaces that injects into an action a
java.util.Map that usually is enough for testability.
My own common solution to this problem would be to use Spring to
inject a service bean into the action that would retrieve the category
list from a cache (OSCache works great for me and has easy Spring
integration.) When data is not in the cache or it times-out, it is
read from the database.
2008/7/9 Chris Pratt <[EMAIL PROTECTED]>:
> That's usually how I start. The one thing I usually add is an Aware
> interface that allows me to inject the value into my Actions when it's
> needed. So in your case I'd add a simple interface:
>
> interface CategoryListAware {
> void setCategoryList(List<Category> categories);
> }
>
> And at the end of your interceptor I'd add:
>
> Object action = invocation.getAction();
> if(action instanceof CategoryListAware) {
> ((CategoryListAware)action).setCategoryList(categoryList);
> }
>
> That way you can add the Interceptor to your default stack and the
> Actions that need the category list can have it injected without
> having to have any knowledge about the Session. (which makes the
> system much easier to unit test).
>
> (*Chris*)
>
> On Wed, Jul 9, 2008 at 3:28 PM, Dhiraj Thakur <[EMAIL PROTECTED]> wrote:
>> Hello there,
>>
>> There are 4 jsp page in which i want to show same category by retrieving it
>> from database.
>> What is the best way to do that? should i write a intercepter which will
>> retrieve Category from database and store it in session?
>> something like this
>>
>>
>> if (session.getAttribute("category") == null) {
>>
>> CategoryDAO categoryDAO = new CategoryDAO();
>>
>> categoryList = categoryDAO.listCategory();
>>
>> session.setAttribute(ConfigAPP.CATEGORY_KEY, categoryList);
>>
>> categoryList = (List)
>> session.getAttribute(ConfigAPP.CATEGORY_KEY);
>>
>> System.out.println(categoryList.size());
>>
>> } else {
>> categoryList = categoryList = (List)
>> session.getAttribute(ConfigAPP.CATEGORY_KEY);
>> }
>>
>>
>> or is there any other way to do that ?
>>
>>
>>
>> *Dhiraj*
>>
>
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