I'm sure that if I was an accademic chap sitting in my Ivory tower, I'd be able to
remember the "official" names, but some days I'm too busy using the actual patterns to
get beyond thinking "I need a wrapper here" and "I'd better hide that behind an API".
Maybe I need a cheat sheet so that I can look up
API = Facade
Wrapper = Proxy
etc etc
Some days I REALLY need one of those.
Simon
>-----Original Message-----
>From: John Owen [mailto:[EMAIL PROTECTED]]
>Sent: Monday, October 14, 2002 1:58 PM
>To: Struts Users Mailing List
>Subject: Re: DAO or ... ?
>
>
>The funny thing is that they gave them these names so we
>(developers) could
>communicate better. ;) It was one of the reasons for the book.
>----- Original Message -----
>From: "Chappell, Simon P" <[EMAIL PROTECTED]>
>To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
>Sent: Monday, October 14, 2002 1:53 PM
>Subject: RE: DAO or ... ?
>
>
>You know, patterns are wonderful, but am I the only person who
>thinks that
>the names that were selected by the GoF are terrible? I may just be old
>fashioned, but I think in terms like wrapper, API and
>controller, not facade
>and command.
>
>Oh well. At least I can use patterns even I can't remember for
>the life of
>me what the official name for it is! :-)
>
>Simon
>
>-----------------------------------------------------------------
>Simon P. Chappell [EMAIL PROTECTED]
>Java Programming Specialist www.landsend.com
>Lands' End, Inc. (608) 935-4526
>
>
>>-----Original Message-----
>>From: Couball, James [mailto:[EMAIL PROTECTED]]
>>Sent: Monday, October 14, 2002 1:21 PM
>>To: 'Struts Users Mailing List'
>>Subject: RE: DAO or ... ?
>>
>>
>>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:struts-user->[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]>
