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Struts & Hibernate
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| | | Business Delegate | Business Delegate 2004-04-16 - By George Maggessy
Back
The BDs are in the client part, that is, it won?t work
until u call it.
--- Ricardo de Souza Moura <ricsouzamoura@(protected)>
wrote:
> Ok, I got it.
>
> But I still have some doubts about to do cache:
>
> > > My ServletContainer an my EJBContainer are in two
> > > differents machines. If
> > > only the EJBContainer restart what happen with my
> cache at
> > > the ServletConainer's machine
> > > ? it won't work anymore, will it ?
> In your sample, your method getEJB won't work untill the
> ServletContainer
> restart.
> am I right ?
>
>
> >From: George Maggessy <gmaggess@(protected)>
> >Reply-To: gjr@(protected)
> >To: J2EEPATTERNS-INTEREST@(protected)
> >Subject: Re: Business Delegate
> >Date: Fri, 16 Apr 2004 13:02:00 -0700
> >
> >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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> > > > >
> > > > >
> > >
> >
>
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