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Struts & Hibernate
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| | | Business Delegate | Business Delegate 2004-04-16 - By Ricardo de Souza Moura
Back
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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