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From "Geoff Longman" <glong...@intelligentworks.com>
Subject Re: Modularized Applications in 3.1?
Date Fri, 11 Jun 2004 13:21:32 GMT
Right now that case causes Spindle to crash. I can prevent the crash but producing a valid
build is going to be really tough if the restriction is relaxed.

Spindle walks the xml tree in a library file, resolves its child libraries and then its pages/components.
That way the child libraries is fully resolved before any pages or components are resolved.

Spindle currently craches in a cycle because the parent is not finished being resolved, its
Namespace object is not stored, so when the builder tries to resolve the child, the builder
checks its store - not there - and tries to resolve the parent from scratch. You get into
a loop and end up with a stack overflow.

I can get detect loops by storing the Namespace early with a (isFullyResolvedFlag). That fixes
the stack overflow but doesn't make things any better 'cuz a half resolved Namespace will
result in missing page/component errors.

Geoff


----- Original Message ----- 
From: "Mind Bridge" <mindbridgeweb@yahoo.com>
To: "Tapestry development" <tapestry-dev@jakarta.apache.org>
Cc: <JulioC.Rivera@carm.es>
Sent: Friday, June 11, 2004 8:16 AM
Subject: RE: Modularized Applications in 3.1?


> [Taking this to -dev]
> 
> There is one more issue in this post: at the moment libraries need to form a
> tree, rather than a graph -- there must not be cycles e.g. if lib A uses lib
> B, lib B cannot use lib A, since you are going to get A:B:A:B:A:B.....
> 
> I think this makes sense in a properly designed app, but nevertheless, is it
> desirable to relax that condition?
> 
> 
> -----Original Message-----
> From: Julio C. Rivera [mailto:JulioC.Rivera@carm.es]
> Sent: Friday, June 11, 2004 2:07 PM
> To: Tapestry users
> Subject: RE: Modularized Applications in 3.1?
> 
> 
> See this thread
> (http://www.caddr.com/macho/archives/tapestry-users/2004-1/3251.html) about
> problems modularizing applications using libraries.
> 
> Regards.
>    Julio.
> 
> At 12:22 11/06/2004, you wrote:
> >At the moment the Wiki says:
> >
> ><quote>
> >Tapestry 3.0 expects all Tapestry pages and components in the application
> >to be within a single directory
> ></quote>
> >
> >THIS IS *NOT* TRUE
> >
> >If the page/component is defined in the .application or .library file, the
> >specification can be placed anywhere on the classpath. In this way the
> >pages and components can be organized in different folders depending on
> >their logical purpose. The "all files in one directory" approach was added
> >only in 3.0 to make things easy for people who want to start quickly.
> >
> >There is another common falacy as well -- if defined in the .application
> >file, all of the files of one page or component (.page/.jwc, .html, .java)
> >can be placed in the same place, rather than have the .jwc in one, the
> >.html in another, and the .java in yet another. If Tapestry is used for
> >large scale development, that helps a lot.
> >
> >
> >Back to modularized applications: You can organize Tapestry pages and
> >components in libraries, like the default Contrib library, and then
> >distribute those libraries in jars. This feature has been there for a long
> >time (since 2.2, I think). All the web applications we produce consist of
> >a multitude of libraries, among which a large number of Tapestry ones that
> >contain shared components and pages. It seems to me that this qualifies as
> >a modular approach.
> >
> >
> >I think that what the Wiki essentially refers to is being able to place
> >pages in different folders in the context, being able to use a different
> >URL scheme, etc. Those features will be in 3.1, but they are not ready
> >yet, I believe. Nevertheless, this does not preclude the modular
> >organization of the application.
> >
> >-mb
> >
> >-----Original Message-----
> >From: Jose Gonzalez Gomez [mailto:jgonzalez@opentechnet.com]
> >Sent: Friday, June 11, 2004 12:40 PM
> >To: Tapestry users
> >Subject: Modularized Applications in 3.1?
> >
> >
> >
> >     In the following page from the Tapestry wiki
> >
> >         http://wiki.apache.org/jakarta-tapestry/Tapestry31
> >
> >     they mention modularized applications. Is this going to be / has
> >been included in 3.1? It seems there is no reference to this version in
> >the Apache download pages, so I guess the only way to test the ongoing
> >work is to download the code right from the CVS, am I right?
> >
> >     Regards
> >     Jose
> >
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> *************************************************
> Julio C. Rivera Riquelme
> Unidad de Informática
> Gerencia de Atenci├│n Primaria de Murcia
> C\ Escultor Sanchez Lozano, 7
> *************************************************
> 
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