[Springframework-developer] Adding Contribution support

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Hi developers,

   I am still dreaming about Spring supporting contributions
right out of the box. I posted an article in the architectural section
of the forum. I guess I found a quite good and sound implementation.

This is the short form:

1. new contribution tag features the same things bean also does.

<contribution extension-point="extensionPoint id" class="MyClass">
   same as bean
</contribution>

2. A extension point is constructed by the application hosting it.
type ExtensionPoint {
   //nothing just for identification
   //maybe hidden storing of the extension point id for semantic equal 
checking
}

3. Add support to the ApplicationContext for pulling the contributions

Object [] successfullInstanciatedContributions=
    ApplicationContext.instanciateContributions(ExtensionPoint, 
ExtensionPointPolicy);

4. ExtensionPointPolicy is about finishing the init process of a 
contribution
since some not hardwired dependencies have to be set by the stakeholder
of the contribution and can not be described within the contribution 
definition.

type ExtensionPointPolicy {
    boolean isCompatibleContribution(ContributionDefinition);
    injectAdditionalDependecies(Object contributionInstance);
}

So loading contributed toolbar actions may look like this:
MyApplication.loadToolBarActions{
     Object [] toolBarActions=
         applicationContext.instanciateContributions(toolbarActionsExtensionPoint,
           new ToolBarActionsExtensionPointPolicy());
}

private class ToolBarActionsExtensionPointPolicy
                       implements ExtensionPointPolicy {
      boolean isCompatibleContribution(ContributionDefinition) {
           Class 
contributionalType=contributionDefinition.getContributionType();
           return contributionalType.isCompatible(ToolBarAction.class);
           //no additional checking in this example
      }

      injectAdditionalDependencies(Object contributionInstance) {
          ((ToolBarAction)contributionInstance).setEnabled(true); //just to 
be scenceless
      }
}

Thats all. I guess this can be added quite cleanly. And I would enjoy doing
it myself :-).

It would provide great help I guess. The Spring RPC currently suffering
of the lack of defining contributions and using an extension point 
mechanism.

All is described in more detail within the forum article.

Cheers,

Martin (Kersten)

----- Original Message ----- 
From: "Jean-Philippe Gariepy" <ga...@ya...>
To: <spr...@li...>
Sent: Monday, February 21, 2005 4:47 PM
Subject: RE: [Springframework-developer] Custom bean instantiation language?

>
> I choose the { and } characters for the lists and [ ] for the maps.
>
> So instead of...
>
> <bean id="myBean" class="example.MyClass">
>  <property name="someList">
>    <list>
>      <value>item value</value>
>      <ref bean="beanReference"/>
>    </list>
>  </property>
>
>  <property name="someMap">
>    <map>
>      <entry key="key1">
>        <value>value1</value>
>      </entry>
>      <entry key="key2">
>        <value>value2</value>
>      </entry>
>    </map>
>  </property>
> </bean>
>
> ...I have...
>
> <myBean class="example.MyClass">
>  <someList>{item value, @beanReference}</someList>
>  <someMap>[key1=value1, key2=value2]</someMap>
> </myBean>
>
> Note that I've allowed bean references to be keys.  Hence, the following 
> is
> legal:
>
> <myBean class="example.MyClass">
>  <someList>{item value, @beanReference}</someList>
>  <someMap>[@beanReference=value1, key2=value2]</someMap>
> </myBean>
>
> Of course, when a meta-character (@ , [ ] { } =) is part of the key or 
> value,
> an escape character is required:
>
> <myBean class="example.MyClass">
>  <emailAddresses>{user1\@domain1.com, user2\@domain2.com}</emailAddresses>
> </myBean>
>
> Jean-Philippe
>
> --- Cameron Braid <ca...@br...> wrote:
>
>> > -----Original Message-----
>> > From: spr...@li...
>> > [mailto:spr...@li...] On 
>> > Behalf
>> > Of Jean-Philippe Gariepy
>> > Sent: Monday, 21 February 2005 12:29 PM
>> > To: spr...@li...
>> > Subject: Re: [Springframework-developer] Custom bean instantiation
>> > language?
>> >
>> > (This is an opportunity for me to share my thoughts about the bean
>> > factory.)
>>
>> --SNIP--
>>
>> > I've added other lightweight syntaxes for lists and maps.
>> >
>>
>> Can you please share them too. I like the look of this :)
>>
>>
>> Thanks,
>>
>> Cameron
>>
>
>
> =====
> ---------------------------------------
> Jean-Philippe Gariépy (ga...@ya...)
>
> "Quand l'appétit va, tout va."
>                       -Obélix
>
>
>
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