[opencms-dev] Module Action class updateModule method

[Mariano Barcia]

Hi Achim W., Achim A.,

Our company is having a hard time due to the need to restart the context
every time a module is installed or re installed. Moreover, sometimes tomcat
does not seem to copy the JARs needed to the WEB-INF/lib folder.

Does a "module class loader" for opencms makes sense?

Proposal:

- Build a module class loader that adds functionality to the current opencms
modules core.

- The module class loader, upon INSTALL, should look into the WEB-INF/lib of
the newly installed module for JARs, and load and register the classes
inside those JARs

- The module class loader, upon UNINSTALL, should unload the classes
registered with the module

- This module class loader should be transparent to the module developers.

If it worked on Tomcat only, I think it would be a big hit. 

I look forward to your comments, TIA
--mariano


-----Mensaje original-----
De: opencms-dev-bounces at opencms.org [mailto:opencms-dev-bounces at opencms.org]
En nombre de Joachim Arrasz
Enviado el: Tuesday, November 08, 2005 5:35 AM
Para: The OpenCms mailing list
Asunto: Re: [opencms-dev] Module Action class updateModule method

Hi

> the module handler class ships within your module, most often in a jar. 
> Before an import it is not known to the JVM running.

right

> It will be highly depnendant on the caching of the application server's 
> current Classloader wether dynamic class loading 
> (class.forName("name"))") will be successful or not. Only by 
> implementing a non - caching CL for module initialization after import 
> this could be possible - expensive though.

Well, most of todays popular servers like JBoss, Tomcat, We4bSphere ... 
are able to check their lib folders at app's runtime. They updates the 
cl's cache after you changed lib folders content. So it is not so 
expensive. But you're right, not ALL servers can do this.

And it is one more point of failure for users of opencms when they have 
to configure this manually.

Regards Achim


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