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| | | Page by Page Iterator | Page by Page Iterator 2003-11-26 - By Pascal Dussart
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You can also have a look at the "EJB Component Architecture: Designing
and codeing Enterprise Applications" book excerpt on "The Benefits of
Stateful Session Beans".
The article has an example on the Value List Iterator pattern. The
author also suggests the following strategy:
"Stateless session bean/stateful session bean combination. This strategy
uses a stateless session bean to access the data and a stateful session
bean to manage the iteration of the list. A stateful session bean
presents a clean interface to a client and keeps track of all the
client-specific data. The stateful session bean also translates
client-specific parameters into calls to the stateless bean, which holds
the data."
The article sits here: http://makeashorterlink.com/?D1B612A96
Hope this helps
Pascal
On Thu, 2003-11-20 at 19:01, Sean Brydon wrote:
> Hi,
> the page by page iterator is now called the value list handler and is is
> described and explained how its use in the petstore app at
> http://java.sun.com/blueprints/patterns/ValueListHandler.html
>
> hth,
> Sean
>
> Koala Gnu wrote:
>
> > Hi all,
> >
> > Some questions regarding the page by page iterator pattern.
> >
> > I learnt how this patterns works looking at the petstore application.
> > Then I tried to search on google a full description of this pattern,
> > but I found only one document in spanish.
> >
> > *First question.* Can anyone of you send me a link with a full
> > description of this pattern?
> >
> > *Second question.*
> >
> > I have a DAO layer which perform a specific JDBC query Q that returns
> > a set of data of
> > type T.
> > Now I want display this result page by page. If I use the Page by Page
> > Iterator pattern, the query Q will be executed each time the user
> > switch from a page to another (each time the
> > start point of the cursor in the Resultset will change). But this is
> > not acceptable if the query is very expansive.
> >
> > I read a thread on theserverside.com but I do not understand what to
> > do in this case.
> > I think that the Page by Page Iterator is not appropriate in this case.*
> >
> > Third Question.* Is it possible combine the Page by Page solution with
> > another pattern that is more appropriate for complex queries? In this
> > way the client know that the result is paged
> > but it do not know how this paging is implemented (Page by Page or
> > other patterns).
> >
> > Thanks in advance for any help.
> > ====================================================================
> > Companion Site: http://www.corej2eepatterns.com J2EE BluePrints:
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> > http://archives.java.sun.com/archives/j2eepatterns-interest.html
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>
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--
Pascal Dussart pascal@(protected)
http://www.loQutus.com gsm +32 473 72 47 73
Technologiepark Zwijnaarde 3 B-9052 Gent
tel +32 9 241 56 06 fax +32 9 241 56 56
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