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Message-ID: <4C109E66.1090009@flexsecure.de>
Date: Thu, 10 Jun 2010 10:12:22 +0200
From: Simon Kulessa <kulessa@flexsecure.de>
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To: MyFaces Discussion <users@myfaces.apache.org>
Subject: Re: [Trinidad] concurrent access to a sortable table
References: <4C0F7609.4000208@flexsecure.de>
 <0b3b01cb086a$408fe9c0$c1afbd40$@millman@mizar.com>
In-Reply-To: <0b3b01cb086a$408fe9c0$c1afbd40$@millman@mizar.com>
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Hello Mark,

thanks for your answer.

I think the code line you mentioned describes the default behaviour of=20
the framework. So the problem with the concurrent access would not be=20
solved, because the framework would still use the integer indices.

Best regards,
Simon Kulessa.

Am 10.06.2010 08:57, schrieb Mark Millman:
> I've done the following to create SortableModel from Lists
>
>      model =3D (SortableModel)
> org.apache.myfaces.trinidad.model.ModelUtils.toCollectionModel((Object)=
list)
> ;
>
> It's not elegant but it seems to work well enough.
>
> Mark
>
> -----Original Message-----
> From: Simon Kulessa [mailto:kulessa@flexsecure.de]
> Sent: Wednesday, June 09, 2010 4:08 AM
> To: users@myfaces.apache.org
> Subject: [Trinidad] concurrent access to a sortable table
>
> Hello everyone,
>
> I am developing a web application for my company based on JSF 1.2.14 an=
d
> Trinidad 1.2.13. In this application we have different views
> that are displayed with the help of the<tr:table>  tag.
>
> We discovered recently that the default data model
> does not support concurrent access to the data.
>
> Source:
> http://myfaces.apache.org/trinidad/trinidad-api/apidocs/org/apache/myfa=
ces/t
> rinidad/model/CollectionModel.html
>
> --
> The only solution to this problem i have discovered so far, is that
> we have to implement our own CollectionModel to support unique row keys=
=2E
>
> Question 1: Is there really no other way to support concurrent access?
> Question 2: Does a tutorial or a discription exist, how the framework
> uses the CollectionModel? Or a tutorial for implementing your own
> CollectionModel ?
>
> --
> I have tried to implement a class that extends the CollectionModel clas=
s
> and implemented the necessary methods.
>
> For example: I used the setWrappedData(Object o) method to save the dat=
a
> as an attribute inside the CollectionModel and to generate an index to
> map the uniqueKey to the specified row.
>
> Request 3: It would be helpfull if someone can provide a sample for an
> efficient implementation of a CollectionModel ?
>
> --
> To return the CollectionModel to the Framework I changed the return typ=
e
> of the getData method (<tr:table values=3D"someBean.data">) from the
> previously used List<Data>  to CollectionModel, which now wrapps the
> List<Data>.
>
> The bad thing is, that the framework calls this method three times
> during the render phase. That means I currently need to create/convert
> the CollectionModel and the index for the mapping three times.
>
> Question 4: Is there a way to prevent this?
> Maybe an additional check can be added to verify in which render state
> the call is made?
>
> --
> Another problem is that our data table needs to support sorting.
> The default CollectionModel does not support sorting and the
> SortableCollectionMethod does not seem to be expandable
> (since it uses Integer's as rowKeys).
>
> The solution seems to override the "isSortable, getSortingCriteria,
> setSortingCriteria" methods of the CollectionModel
> and implement the sorting feature on your own.
>
> Question 5: Again, is that really the way you have to do it?
> Request 6: An efficient sample of an implementation would be nice.
>
> --
>
> Any help is appreciated.
> If necessary I could provide my sample implementation.
>
>
> Best regards,
> Simon Kulessa.


--=20

Diplom Informatiker Simon Kulessa

FlexSecure GmbH
Industriestr. 12
D - 64297 Darmstadt
Tel: +49 (0) 6151 501 23-15
Fax: +49 (0) 6151 501 23-19
E-Mail:kulessa@flexsecure.de
Internet:www.flexsecure.de

Gesch=E4ftsf=FChrer:
Erwin Stallenberger, Markus Ruppert

Amtsgericht Darmstadt HRB 8036
Umsatzsteuernummer: DE 214745269


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