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Re: [Springframework-developer] Adding Contribution support
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From: Martin K. <Mar...@St...> - 2005-02-22 16:01:20
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>I think my understanding is a little skewed. Does the extension point id
>match with multiple contributions?
The extension point is definied by the extension point stakeholder.
Therefore imagen an application window you want to contribute
actions for.
<contribution extension-point="org.springXX.rpc.ui.toolBar"
class="MyContributedAction"/>
<contribution extension-point="org.springXX.rpc.ui.toolBar"
class="MyOtherContributedAction"/>
The RPC ApplicationWindow would hold this extension point
and it will be the ApplicationWindow which will pull the actions
and place it within its toolbar.
That's how contribution works. Contributions are nameless little
fellows contributing to features the extension-point stakeholder
would love to be extended.
Also applying this to the Hibernate core:
currently you provide the session factory with the mapping files directly.
But why not the reversed way?
<bean id="sessionFactory" ...../>
<contribution extension-point="org.springframework.orm.hibernate.mapping"/>
<mapping>Here goes my MappingFile.xml</mapping>
</contribution>
I plan to add an image repository system and extend the context processing
by adding intelligent dependency injection.
Cheers,
Martin (Kersten)
Martin Kersten wrote:
>> Couldn't this be done without the <contribution> tag - that is to say
>> just use the <bean> tag and then do:
>
>
>> ListableBeanFactory.getBeansOfType(Contribution.class);
>
>
> Wouldn't you think that would blow up your thinking?
> You know a bean is a bean but a contribution is something diffrent.
> It's the reverse way. You dont identify a contribution by its name or
> id (to abuse id here). It's about I want to take part. It's not I am
> what I am. It's a complete diffrent concept.
>
>> Then post process them. You could actually add this support as a
>> BeanFactoryPostProcessor, since all you are really doing is chucking in
>> some additional dependencies based on the policies.
>
>
> Would be working in an implementation way but the
> descriptive language the xml configuration compose gets malformed.
> It is like implementing a List by hacking a provided Set implementation.
> Can be done but I wont use it.
>
>> Applications can then lookup the contributions they want through some
>> kind of ContributionManager interface.
>
>
> Would be possible but this is ApplicationContext related stuff so I
> would have to change this too.
>
>> Basically, I think you can add this support without the need to tweak the
>> underlying Spring configuration format.
>
>
> It would not be possible because contributions shouldn't have an id or
> name.
>
>
> Let's see how easy it gets. The support wont break the API but
> if you are not yet convinced, I guess the main benifit it provides to
> the rich client project will do (and adding something like that to
> the rich client project does not need to effect the framework API).
>
>
> Cheers,
>
> Martin (Kersten)
>
> Martin Kersten wrote:
>
>> 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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>>
>>
>>
>>
>>
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>>
>
>
> -------------------------------------------------------
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> _______________________________________________
> Springframework-developer mailing list
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>
>
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> Read honest & candid reviews on hundreds of IT Products from real users.
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