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From Ashish Kulkarni <kulkarni_ash1...@yahoo.com>
Subject Re: Design Patterns/Examples
Date Wed, 29 Jan 2003 16:51:50 GMT
Hi Shirish
can u email the code please to my email
kulkarni_ash@yahoo.com

Ashish
--- Vinay <vinay@mdp.net> wrote:
> Hi shirish ,
>         Can you please send me sample code for code
> generation to my e-mail
> address. I am interested in some examples which use
> design pattersns.
> 
> Thanks a lot
> 
> regards
> Vinay
> ----- Original Message -----
> From: <shirishchandra.sakhare@ubs.com>
> To: <struts-user@jakarta.apache.org>
> Sent: Wednesday, January 29, 2003 3:48 AM
> Subject: RE: Design Patterns/Examples
> 
> 
> Hi,
> We have used folowing approach..
> 
> To access db , we use DAO pattern(refer to Sun's
> blue prints for more
> details).The DAOs return value objects And all calls
> to the DAO must go
> through
> service layer..
> 
> So in action classes u get Instance of appropriate
> service from service
> factory
> and call the corresponding method..So all the data
> base access logic  and
> conversion of result set to u r value beans is in
> service layer.(We have
> used
> converter classer for the same..One converter per
> Value bean...)
> Also as service factory is used, u can pretty much
> change ur servie
> implementation with out afecting the struts layer.
> 
> So on struts side ,the action clsses are pretty much
> simple .They just
> delegate
> the request.
> In action, we get the data from request.And validate
> the data and if any
> validation errors, send back to the user.Each form
> contains value beans as
> thier attributes.So the data from jsps is
> automatically populated in the
> form
> beans and the action just has to cast the form bean
> to appropiate type and
> call
> getBean or beanList as the case may be..
> 
> And as u said, the most important part is how we
> handle conversion of data
> from
> primitives to string and vice versa.On form bean,
> all beans are
> StringBeans...So for each ValueBean we have a
> corresdpondign String
> bean..And
> the StringBEan has a method getBean which returns
> the corresponding
> valueBean
> after performing the conversions from String to
> primitive type.Similarly on
> each ValueBEan we have a getStringBEan which
> performs the conversion from
> primitive to String type.And we have a Utility class
> ParsingUtils which has
> all
> the conversion methods...
> 
> The most important part is we use CodeGeneration
> using XSLT to create the
> value
> BEans,DAOs,COnverters for value beans and the String
> beans.And for the code
> generation , we use an XML which describes which
> StroedProc is caled and the
> field names etc etc.So all this conversion methods
> (getStringBean and
> getBean)are also auto generated.And as we have
> utility methoda in
> PArsingUtils,this is nto at all difficult.So we dont
> spend any time at all
> coding data conversion or data access layer.All we
> need to do is write jsps
> and
> action classes to delegate...
> 
> Hope this is not too lengthy or confusing...I know
> there are some issues
> like
> too many Objects are  created(for each bean, a
> correspondign string bean is
> created etc etc..)but we have found a satisfactory
> performance for our load
> tests...
> 
> If any body s interrested, i can give sample code
> for code generation as
> well..
> 
> hope this helps,
> regards,
> Shirish
> 
> -----Original Message-----
> From: pat.quinn2009
> [mailto:pat_quinn2009@hotmail.com]
> Sent: Tuesday, January 28, 2003 9:21 PM
> To: struts-user
> Subject: Design Patterns/Examples
> 
> 
> 
> Hi Guys,
> 
> Any one know of some design patterns or examples i
> could use with struts. I
> want to access a database(Value Objects) allow the
> user to change the VO
> data, perform some business validation and update
> the database. I'd like
> some pointers also when working with form beans and
> vo object whats the best
> way to transfer data between them... should i use
> vo's as instance variable
> instead form bean... if so how will i handle java
> primitives like double's
> etc..
> 
> 
> I'm not looking for the answers to all the above but
> i'd like to review a
> pattern or example which demonstrates the best
> approach for the above.
> 
> 
> I have my own ideas but would like to look over some
> design
> patterns/examples before commencing this work.
> 
> Cheers,
> 
> Guys
> 
> 
> 
> 
> 
> 
>
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