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Struts & Hibernate
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| | | Business Delegate | Business Delegate 2004-04-16 - By George Maggessy
Back
I think this sample could clear things out...
public class MasterDelegateHandler
extends DelegateHandler {
private static MasterDelegateHandler instance = null;
private static MasterSessionHome home;
/**
* Constructor
*/
private MasterDelegateHandler() throws LookupException {
Reloj cron = new Reloj();
cron.start();
home =
(MasterSessionHome)ServiceLocator.getHomeSession(
GeneralConstants.JNDI_MAESTRAS_SESSION);
LogUtility.log(MasterDelegateHandler.class,
"Tiempo lookup MasterSession " +
Reloj.formatTime(cron.getElapsedTime()),
Log4JConstants.DEBUG);
}
public static synchronized MasterDelegateHandler
getInstance() {
if (home == null) {
try {
instance = new MasterDelegateHandler();
} catch (LookupException ex) {
ex.printStackTrace();
}
}
return instance;
}
private MasterSession getEJB() {
MasterSession remote = null;
try {
remote = (MasterSession)home.create();
} catch (RemoteException ex) {
ex.printStackTrace();
} catch (CreateException ex) {
ex.printStackTrace();
}
return remote;
}
public ResponseVO getAllIra() {
ResponseVO response = new ResponseVO(null);
try {
response = getEJB().getAllIra();
} catch (Exception ex) {
LogUtility.log(MasterDelegateHandler.class,
ex.getMessage(),
Log4JConstants.FATAL);
return new ResponseVO(null,
new
MessageVO(MessageVO.ERROR,
PropertyManager.getInstance().
getProperty(
GeneralConstants.FILE_MESSAGES,
ErrorCode.COMUN_ERROR_GENERAL)));
}
return response;
}
...
Did I help u?
--- Ricardo de Souza Moura <ricsouzamoura@(protected)>
wrote:
> I would like very much. thank you.
>
> But I was thinking about construct my Business
> Delegate(BD) not like a EJB.
> The BD would be a normal class. therefore my web tier
> don't need to worry
> about look up or RemoteException for example. Only my Bd
> would need to worry
> about this. is it OK ? Do you agree ?
>
> About to do cache I have some doubts.
> My ServletContainer an my EJBContainer are in two
> differents machines. If
> only the EJBContainer stop what happen with my cache at
> the ServletConainer
> ? it won't work anymore, will it ?
>
>
> >From: George Maggessy <gmaggess@(protected)>
> >Reply-To: gjr@(protected)
> >To: J2EEPATTERNS-INTEREST@(protected)
> >Subject: Re: Business Delegate
> >Date: Fri, 16 Apr 2004 12:20:35 -0700
> >
> >Hi Ricardo,
> >
> >Yes. This is a good structure. In fact, I use this
> patterns
> >and my app works fine. The only thing you have to worry
> >about is the business delegate or delegate handler.
> There
> >are diferent types for diferent session beans. Like...
> >Cache the EJB Handle for stateful beans or cache the
> >EJBHome for stateless beans... I could send u a sample
> if u
> >want.
> >
> >Cheers,
> >George Maggessy
> >
> >
> >--- Ricardo de Souza Moura <ricsouzamoura@(protected)>
> >wrote:
> > > Hi folks,
> > > I have a doubt.
> > >
> > > I am projecting my application with the structure
> below:
> > >
> > > web tier => business Delegate(BD) =>
> ServiceLocator(SL)
> > > => Session
> > > Facade(SF) => EJBs
> > >
> > > The web tier use the BD to call business methos.
> > > The BD use the SL to get a SF
> > > The BD use the SF to call business methods
> > > SF is a Session Bean and use Entity Beans and others
> > > Session Beans to do its
> > > work.
> > >
> > > Is this strutcture a good practice ?
> > >
> > > Does Somebody have another suggestion ?
> > >
> > > Thanks
> > >
> > >
>
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