Uppps,
thanks Craig and apologises for asking something that, probably, I could find for myself. However, I think this kind of questions enrichs the forum anyway since more people can wonder the same and having a place to find quick responses is cool. Apologises anyway. Best regards, Adolfo. >From: "Craig R. McClanahan" <[EMAIL PROTECTED]> >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> >To: Struts Users Mailing List <[EMAIL PROTECTED]> >Subject: Re: �DynaBeans performance? >Date: Fri, 10 May 2002 08:58:52 -0700 (PDT) > > > >On Fri, 10 May 2002, Adolfo Miguelez wrote: > > > Date: Fri, 10 May 2002 08:55:26 +0000 > > From: Adolfo Miguelez <[EMAIL PROTECTED]> > > Reply-To: Struts Users Mailing List <[EMAIL PROTECTED]> > > To: [EMAIL PROTECTED] > > Subject: �DynaBeans performance? > > > > Hi All, > > > > despite, AFAIK, Struts propose usual JavaBeans as value objects to be >sent > > to JSPs, we are using general hashmaps to hold the results from database > > queries to JSP. It allow as skipping to create a particular bean for >each > > result from the database, and making a general mechanism rather than a > > specific one. > > > > The backward of that is that custom tags assume that data holders in JSP >are > > beans and they allow just to render info stored in them rather than in > > hashmaps so, in some cases, we need to provide a customized custom tag >to > > introspects hashmaps info from the JSP. > > > > We have just met DynaBeans days ago, and I was wondering if we could >modify > > our value objects to be DynaBeans rather than hashmaps. In that way, we > > would not need to patch Struts custom tags. they seems to be available >since > > Struts 1.1b1, is not it? > > > >Yes, in terms of using DynaActionForm. You can also use standard >DynaBeans directly (for instance, to create value objects) by grabbing >version 1.3 of the commons-beanutils package. > > http://jakarta.apache.org/commons/beanutils/ > >The JavaDocs have pretty thorough coverage of DynaBeans, as well as the >alternative implementations that are available in the standard package. > > > My question is which one is performance impact of creating DynaBeans on >the > > fly, and filling them with results from database queries. Since >DynaBeans > > are created by introspection techniques, I am afraid they could slow >down > > the application performance. > > > >Have you looked inside the DynaBeans implementation classes by chance? >It's just using HashMaps underneath :-) > >In fact, if you use the BasicDynaBean implementation class for your value >objects, there is *no* reflection going on in the get() and set() methods. >The only difference, compared to maintaining your own HashMap, is that >BasicDynaBean will do property name and property type checking for you. > > > Does anyone have made any test in this area or any opinion in this >concern? > > > > Thanks in advance, > > > > Adolfo > > > >Craig > > >-- >To unsubscribe, e-mail: ><mailto:[EMAIL PROTECTED]> >For additional commands, e-mail: ><mailto:[EMAIL PROTECTED]> > _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
