Hi all,
I have created an experimental whiteboard extender for Action objects to
export them as commands.
See:
https://issues.apache.org/jira/browse/KARAF-2762
And this as an example:
https://github.com/cschneider/Karaf-Tutorial/tree/master/db/command2
The idea is that you simply create the Action in code like today and
export it as a service with the di framework of your choice. The action
is then picked up by the whiteboard extender and exposed as a command.
One problem with this approach was that we need to create a new Action
instance for each call to the command. I have found a simple way to do
this. Basically I simply do class.newInstance() and copy all field
values from the template. I also found a way to define completers. I
simply check the Action for fields of type Completer and add these to
the list of completers.
I think this approach has some advantages compared to the DSL model
Guillaume proposed.
1. We have very loose coupling as the use only needs to use interfaces
and annotations
2. The solution is framework agnostic. You can use this model with
blueprint, ds, plain OSGi API, ...
3. You can leverage the dependency injections of your framework. Even
the completers can be injected which is nice if they need services to work.
What do you think?
Christian
--
Christian Schneider
http://www.liquid-reality.de
Open Source Architect
http://www.talend.com
