Sorry Craig, I just realized I misread some of what you originally
wrote. You were talking about sharing 'across' applications and I
wasn't concerned with that so much. You can ignore my previous post. I
apologize.
Rick
On Wednesday, June 26, 2002, 3:16:11 PM, Rick wrote:
RR> Thanks so much Craig, this has been tremendously helpful! Some
RR> comments below...
RR> On Wednesday, June 26, 2002, 2:38:54 PM, Craig wrote:
CRM>> My suggestion is to implement this logic inside a bean that hides whether
CRM>> or not you are really caching the data or not -- say a StoresBean
CRM>> something like this:
CRM>> public class StoresBean {
CRM>> public ArrayList stores = null;
CRM>> public synchronized Iterator getStores() {
CRM>> if (stores == null) {
CRM>> stores = new ArrayList();
CRM>> ... fill in the objects in this list ...
CRM>> }
CRM>> return (stores.iterator());
CRM>> }
CRM>> }
CRM>> That way, the relevant stuff will get loaded the first time and then
CRM>> reused.
RR> Ok, you've started to clear some things up for me. I always
RR> thought thought that classes in my: myAppDir/WEB-INF/classes
RR> directory if they had static members they were shared across the
RR> entire application scope? This definitely is wrong though? (and
RR> it's only session scope?).
RR> In your above code, though, each user session would then end up
RR> loading a new list of stores. I don't really need that. I only
RR> need that list being loaded once and shared amongst all the
RR> sessions.
CRM>> But your calling application doesn't know that -- all it needs to
CRM>> do is grab StoresBean out of the session attributes (if this is user
CRM>> specific) or context attributes (if this is global), and call getStores().
RR> How would I grab this "global" attribute from a business layer
RR> object though? I guess that's where I'm getting confused. Say I
RR> have my Action class call a business object:
RR> BO.getStoresList()
RR> Well now I want the BO to return me a List of StoreBeans, but I
RR> only want that list populated ONE time and want all the sessions
RR> to share it.It looks like if I want all the sessions to share the information
RR> I have to pass servlet classes into my model layer? Am I wrong
RR> there?
CRM>> If the StoresBean bean is in application scope (i.e. a servlet context
CRM>> attribute), then getStores() will go load up the list the first time *any*
CRM>> user requests it, then everyone will share. This makes sense if the data
CRM>> is global to all users. You would want to create this bean as part of
CRM>> your application startup, by either:
CRM>> * In servlet 2.2 or later, create a servlet that is configured for
CRM>> load-on-startup, and set it up in the init() method.
RR> Ok, I have set up some like this in the init() method of an
RR> IntializationServlet I call on startup:
RR> context.setAttribute( "storeList", storeList );
CRM>> * In servlet 2.2 or later, subclass the ActionServlet class in Struts,
CRM>> and override the init() method like this:
CRM>> public void init() throws ServletException {
CRM>> super.init();
CRM>> ... initialize context attributes here ...
CRM>> }
RR> OK! Perfect this is exactly what I should do. Thank you.
RR> (I take it there weren't be any issues doing this to my
RR> controller which extends DispatchAction).
RR> Thanks Craig,
RR> Rick
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Rick
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