Hi Leo,
Hope you enjoyed your holidays. :)
Thanks for taking the time to list some alternative approaches!
On Mon, Jul 28, 2003 at 10:49:20AM +0200, Leo Simons wrote:
>
> think of seperating various types of constructor arguments for your comp
> into the comp configuration, the comp dependencies, etc etc. The URI is
> logically part of the client component configuration, right? Jason van
> Zyl did this in plexus with the Configurator pattern:
>
> interface ServiceBroker extends ServiceManager
> {
> Object lookup( String role, Configuration configuration );
> }
Interesting approach - I remember when Jason was talking about dynamic
reconfiguration of components. This must be how he achieved this.
> the easy way out is to not make everything into an avalon component, but
> have an avalon component provide you with the worker class:
>
> interface MyComponentManager
> {
> String ROLE = MyComponentManager.class.getName();
> Component newInstance( String URI );
> }
>
> mcm = (MyComponentManager)m_sm.lookup( MyComponentManager.ROLE );
> component = mcm.newInstance( m_configuration
> .getchild( "component-uri" ).getValue() );
This probably suits my application the best - I should have realized this
sooner as it's similar to the approach the SourceFactories use to create
Source objects.
In my app though the URI is created dynamically - hence the need to set it
dynamically, but that could still work with the above of course.
> the clean way out is probably to use a lifecycle extension to decorate
> your component with transaction support and make the client component
> configuration part of the transaction state.
I think this is also what Leo Sutic was describing in another reply to my
email. It seems to be similar to the initial interface I had in that I have
to set the URI via a set* method, but I like the use of ThreadLocals to
essentially remove the need for Factory components - brilliant :)
If I used a lifecycle extension to set the transaction configuration though,
do you think it would still be possible to set the configuration
dynamically from data built at runtime??
Thanks again.
Cheers,
Marcus
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;$' '$$$$: Computer Systems Engineer
$: $$$$: ManageSoft GmbH
$ o_)$$$: 82-84 Mainzer Landstrasse
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