That was it, the Command pattern was what I was thinking of... but Session Façade had a bit more to it.
Thanks for the info. James. > -----Original Message----- > From: Jamie M [mailto:[EMAIL PROTECTED]] > Sent: Monday, October 14, 2002 10:37 AM > To: Struts Users Mailing List > Subject: RE: DAO or ... ? > > How about the Command Pattern: > > http://www.javaworld.com/javaworld/javatips/jw-javatip68.html > > An EJB version is mentioned in 'EJB Design Patterns' > (http://www2.theserverside.com/books/EJBDesignPatterns/index.jsp) > too. > > jamie > > --- "Couball, James" <[EMAIL PROTECTED]> > wrote: > > I recommend taking a look at the Session Façade > > pattern in the Java Blue > > Prints. No matter if you use EJBs or not, this > > pattern encapsulates the > > ideas that Simon was mentioning. > > > > Does anyone know the name of the more general > > pattern that doesn't involve > > Session Beans specifically? > > > > One of my general concerns is "design to test". I > > like to be able to test > > the (business/persistence) layer that the actions > > will call independently of > > struts, actions, etc. Encapsulating that layer in > > an API (or wrapping with > > a session bean) makes this possible. > > > > Sincerely, > > James. > > > > > -----Original Message----- > > > From: Andrew Hill > > [mailto:[EMAIL PROTECTED]] > > > Sent: Monday, October 14, 2002 8:16 AM > > > To: Struts Users Mailing List > > > Subject: RE: DAO or ... ? > > > > > > But you still call the API from the action right - > > is this not invoking > > > the > > > functionality that persists your data? > > > > > > Seems a bit like semantic juggling to me... (after > > all the persistance > > > layer > > > is just an abstraction API on top of writing to > > db/disk/punchcard > > > itself...) > > > ;-) > > > > > > I would however agree that there ought to be some > > sort of abstracting > > > layer > > > between the view and the implementation specific > > details of the p-tier... > > > > > > -----Original Message----- > > > From: Chappell, Simon P > > [mailto:[EMAIL PROTECTED]] > > > Sent: Monday, October 14, 2002 23:04 > > > To: Struts Users Mailing List; > > [EMAIL PROTECTED] > > > Subject: RE: DAO or ... ? > > > > > > > > > You invoke your persistence code in the same place > > that you would invoke > > > any > > > other code ... not in the Action! > > > > > > Write all your core application code (business > > rules, persistence, > > > communications etc) in a way that has no > > connection to the view portion of > > > your system and then create a API to it. This way > > you can have any client > > > you like call into your core code and your core > > code doesn't need to worry > > > about what calls it, only about acting upon > > requests. > > > > > > Then use the actions to call into the API and pass > > the API return values > > > to > > > the JSPs. Works great. > > > > > > /------\ /---\ /----\ > > > |Client|--> |API|-->|Core| > > > |Code | | | |Code| > > > \------/ \---/ \----/ > > > > > > The API is now your fire break. Nothing on the > > Core Code side has to worry > > > about displaying anything and nothing in the > > Client Code has to worry > > > about > > > calculating anything. > > > > > > Simon > > > > > > > > > ----------------------------------------------------------------- > > > Simon P. Chappell > > [EMAIL PROTECTED] > > > Java Programming Specialist > > www.landsend.com > > > Lands' End, Inc. > > (608) 935-4526 > > > > > > > > > >-----Original Message----- > > > >From: Andrew Hill > > [mailto:[EMAIL PROTECTED]] > > > >Sent: Monday, October 14, 2002 9:57 AM > > > >To: Struts Users Mailing List > > > >Subject: RE: DAO or ... ? > > > > > > > > > > > >So where should one invoke the persistance layer? > > > > > > > >-----Original Message----- > > > >From: Lacerda, Wellington (AFIS) > > [mailto:[EMAIL PROTECTED]] > > > >Sent: Monday, October 14, 2002 22:51 > > > >To: 'Struts Users Mailing List' > > > >Subject: RE: DAO or ... ? > > > >Importance: High > > > > > > > > > > > >Hi Kevin > > > > > > > >Avoid persistence in Action code as much as you > > can. > > > > > > > >This is the general recommendation. > > > > > > > >Wellington Silva > > > >Author of "JSP and Tag Libraries for Web > > Development" > > > >FAO of the UN - Consultant > > > > > > > >-----Original Message----- > > > >From: Kevin Viet [mailto:[EMAIL PROTECTED]] > > > >Sent: Monday, October 14, 2002 4:45 PM > > > >To: struts-user > > > >Subject: DAO or ... ? > > > > > > > > > > > >My question is a web app design question. > > > >What pattern you guys follow when you want to > > save a domain object in > > > >the database ?: > > > > > > > >- use the DAO pattern of java blueprint > > (persistence layer is called > > > >into classes) > > > >- call to persistence statements into action code > > : > > > > > > > > // store example > > > > try { > > > > PeristenceLayer pl = getPerstitenceLayer(); > > > > pl.save(domainObject); > > > > } > > > > catch (Exception > > > > > > > > > > > >-- > > > >Kevin Viet <[EMAIL PROTECTED]> > > > >ActiVia Networks > > > > > > > > > > > > > > > > > > > >-- > > > >To unsubscribe, e-mail: > > > > > ><mailto:[EMAIL PROTECTED]> > > > >For additional commands, e-mail: > > > ><mailto:[EMAIL PROTECTED]> > > > > > > > > > > > >-- > > > >To unsubscribe, e-mail: > > > > > ><mailto:[EMAIL PROTECTED]> > > > >For additional commands, e-mail: > > > ><mailto:[EMAIL PROTECTED]> > > > > > > > > > > > >-- > > > >To unsubscribe, e-mail: > > > > > <mailto:[EMAIL PROTECTED]> > > > For additional commands, e-mail: > > > <mailto:[EMAIL PROTECTED]> > > > > > > > > > -- > > > To unsubscribe, e-mail: > > > > > <mailto:[EMAIL PROTECTED]> > > > For additional commands, e-mail: > > > <mailto:[EMAIL PROTECTED]> > > > > > > > > > -- > > > To unsubscribe, e-mail: <mailto:struts-user- > > > [EMAIL PROTECTED]> > > > For additional commands, e-mail: > > <mailto:struts-user- > > > === message truncated === > > > __________________________________________________ > Do you Yahoo!? > Faith Hill - Exclusive Performances, Videos & More > http://faith.yahoo.com > > -- > To unsubscribe, e-mail: <mailto:struts-user- > [EMAIL PROTECTED]> > For additional commands, e-mail: <mailto:struts-user- > [EMAIL PROTECTED]> -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
