[TM4J-users] Re: TM4J and Software Architecture

[Bret C. <bre...@ya...>]

Andreas,

I would say that the "database layer" as you call it,
is handled by TM4J, including the indexes and tologx
packages that allow data to be extracted from the
topic map.

The business model layer, if there is one, would be
handled by your own classes. In the application I
created, which you now have, it is handled by my saas
classes.

Pankoucke handles a different layer. I think I've
referred to that layer as an "abstraction layer",
though that may not be the best description. It relies
on the TM4J classes, and possibly on your "business
model classes", to extract the data from the
"database"  (really the topic map loaded from either a
XTM file or a database), and then builds what is
referred to in the Panckoucke documentation as an
"abstract model" of nodes and arcs, which is then
passed to the renderer (the presentation layer). So I
would probably locate Pankcoucke and its layer between
the business model layer and the presentation layer.

Also, you can develop your own abstractors...

Out of time...

Bret

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> Today's Topics:
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>    1. TM4J and Software Architecture (3-tier)
> (Andreas Fleck)
> 
> --__--__--
> 
> Message: 1
> Date: Mon, 13 Jun 2005 13:51:39 +0200 (MEST)
> From: "Andreas Fleck" <And...@gm...>
> To: tm4...@li...
> Subject: [TM4J-users] TM4J and Software Architecture
> (3-tier)
> 
> Hi everybody,
> 
> i´m currently in the Design phase of the software,
> which i want to write
> (the software is a plug-in for Eclipse, which is
> displaying a Topic Map as a
> Touchgraph).
> 
> I want to use the Pancouke library and the
> Touchgraph library (similar to
> TMNav) for my project.
> 
> Now, i am pretty confused about the different
> abstraction layers of my
> programm.
> 
> My software should have a typical 3-tier
> architecture, like this:
> 
> Presentation Model layer
>         ^
>         |
> Business Model layer
>         ^
>         |
> Database layer
>         ^
>         |
> Database
> 
> Can somebody maybe tell me under what Panckouke, the
> TM4J library, the XTM
> Topic Map and Touchgraph can be filed within such an
> architecture? And what
> the equivalent to the database layer might be?
> 
> I´m thinking of something like this:
> 
> Presentation Model layer (Displaying the Topic
> Map->Touchgraph libraries)
>         ^
>         |
> Business Model layer     (Filtering the Topic
> Map->Panckouke)
>         ^
>         |
> Database layer           ??????
>         ^
>         |
> Database                  (XTM File????)
> 
> Is this correct? Or is this the complete wrong
> approach when handling Topic
> Maps?
> 
> I hope you understand what i am trying to say.
> 
> Any answer is highly appreciated, as the
> architecture of the software is
> really crucial to my project.
> I am thankful for any thoughts/ideas/statements
> about this or maybe links on
> this topic.
> 
> Greeting to all
> Andreas
> 
> 
> 
> 
> 
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