Re: Business Delegate

I am thinking that you aren't understand me!!!!

Imagine the situation:
All started, ServletContainer on one machine and ApplicationServer on
another machine.
In this moment your Singleton is in memory.
Now the ApplicationServer needed restart but the ServletContainer didn't
need.

On this situation your Singleton won't work until your ServletContainer
restart, will it ? Because the home instance at the Singleton will be
"dirty"

>From: George Maggessy <gmaggess@(protected)>
>Reply-To: gjr@(protected)
>To: J2EEPATTERNS-INTEREST@(protected)
>Subject: Re: Business Delegate
>Date: Tue, 20 Apr 2004 06:31:10 -0700
>
>I't wont work until the first call. Itï¿½s a singleton, dude!
>
>
>--- Ricardo de Souza Moura <ricsouzamoura@(protected)>
>wrote:
> > So,
> > if this situation happen this method always will pass at
> > the catch block,
> > won't it ?
> > And this situation always will happen untill the
> > ServletContainer restart.
> > Only in this time that your Singleton will be reload.
> >
> > Thanks
> >
> >
> > >From: George Maggessy <gmaggess@(protected)>
> > >Reply-To: gjr@(protected)
> > >To: J2EEPATTERNS-INTEREST@(protected)
> > >Subject: Re: Business Delegate
> > >Date: Mon, 19 Apr 2004 11:35:10 -0700
> > >
> > >I call it inside each business method.
> > >
> > > 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;
> > > }
> > >
> > >
> > >--- Ricardo de Souza Moura <ricsouzamoura@(protected)>
> > >wrote:
> > > > Ok, but your DB implementation is a Singleton, so the
> > > > variables
> > > >
> > > > private static MasterDelegateHandler instance = null;
> > > > private static MasterSessionHome home;
> > > >
> > > > have already been initialized, haven't it ? So when
> > you
> > > > call the getEjb
> > > > method
> > > >
> > > > private MasterSession getEJB() {
> > > > MasterSession remote = null;
> > > > try {
> > > > remote = (MasterSession)home.create();
> > > > } catch (RemoteException ex) {
> > > > ex.printStackTrace();
> > > > } catch (CreateException ex) {
> > > > ex.printStackTrace();
> > > > }
> > > > return remote;
> > > > }
> > > >
> > > > you will get a exception, won't you ?
> > > > >From: George Maggessy <gmaggess@(protected)>
> > > > >Reply-To: gjr@(protected)
> > > > >To: J2EEPATTERNS-INTEREST@(protected)
> > > > >Subject: Re: Business Delegate
> > > > >Date: Fri, 16 Apr 2004 14:34:08 -0700
> > > > >
> > > > >The BDs are in the client part, that is, it wonï¿½t
> > 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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Re: Business Delegate

Ricardo Moura

2004-04-20