I'm working on finishing up a paper comparing Adapter, Bridge, and State Patterns in OO, but I don't remember reading/hearing anything about the GoF :-P
-----Original Message-----
From: John Owen [mailto:[EMAIL PROTECTED]]
Sent: Mon 10/14/2002 2:26 PM
To: Struts Users Mailing List
Cc:
Subject: Re: DAO or ... ?
To be truthful, I hadn't heard of them until about 2 years ago. I had been
mired in a job that did not allow me to pursue my design and professional
goals. Once I got out of there and found a place that needed an experienced
developer that was familiar with Java and C++, I was lucky enough to work
with peers who got me back on track. ;)
----- Original Message -----
From: "Chappell, Simon P" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Monday, October 14, 2002 2:20 PM
Subject: RE: DAO or ... ?
Thanks John. These youngsters ... what do you do with them!? ;-)
>-----Original Message-----
>From: John Owen [mailto:[EMAIL PROTECTED]]
>Sent: Monday, October 14, 2002 2:16 PM
>To: Struts Users Mailing List
>Subject: Re: DAO or ... ?
>
>
>That's the book he was referring to when he said GoF. They are
>called the
>Gang of Four.
>----- Original Message -----
>From: "Hookom, Jacob John" <[EMAIL PROTECTED]>
>To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
>Sent: Monday, October 14, 2002 2:12 PM
>Subject: RE: DAO or ... ?
>
>
>you should pick up "Design Patterns - Elements of Reusable
>Object-Oriented
>Software" by Gamma, Helm, Johnshon and Vlissides under Addison-Wesley
>Publishing
>
>it's the bible for design patterns
>
>-----Original Message-----
>From: Chappell, Simon P [mailto:[EMAIL PROTECTED]]
>Sent: Mon 10/14/2002 2:10 PM
>To: Struts Users Mailing List
>Cc:
>Subject: RE: DAO or ... ?
>
>
>
>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]>
>
>
>
>
>
>
>---------------------------------------------------------------
>-------------
>----
>
>
>> --
>> 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:[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]>
<<winmail.dat>>
-- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
