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Question regarding Extensions [message #1385707]

Tue, 10 June 2014 15:27

Ludwig Moser

Messages: 449
Registered: July 2009

Senior Member

Hello Community!

i try to create an Extension Point for Eclipse, so i follow the tutorial of Lars Vogel :Eclipse Extension Points and Extensions

everything is clear until point 7.6

"Evaluating the registered extensions" where an evaluation-Handler is created.
ok, now whe got a handler...
but what i actualy expect is that if my Plugin gets activate my extension gets added to the defined extension point.

how can i do so? do i need to execute this evaluation handler in the activator?
because right now, my extension point does nothing.

I'm a bit lost from point 7.6 onwards
any help clearing this situation would be nice

PS: right now i have a solution without extension point, but it would be nice to have it done correct!

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Re: Question regarding Extensions [message #1385716 is a reply to message #1385707]

Tue, 10 June 2014 16:10

Thomas Schindl

Messages: 6313
Registered: July 2009

Senior Member

Lars' Tutorial shows the most common use of the Extension Registry which
assumes no bundles are installed after the registry has been read. Do
you really need the dynamic nature?

Tom

On 10.06.14 17:27, Ludwig Moser wrote:
> Hello Community!
>
> i try to create an Extension Point for Eclipse, so i follow the tutorial
> of http://www.vogella.com/tutorials/EclipseExtensionPoint/article.html
>
> everything is clear until
> http://www.vogella.com/tutorials/EclipseExtensionPoint/article.html#tutorialextensionpoint_readingextension
>
>
> "Evaluating the registered extensions" where an evaluation-Handler is
> created.
> ok, now whe got a handler...
> but what i actualy expect is that if my Plugin gets activate my
> extension gets added to the defined extension point.
>
> how can i do so? do i need to execute this evaluation handler in the
> activator?
> because right now, my extension point does nothing.
>
> I'm a bit lost from point 7.6 onwards
> any help clearing this situation would be nice
>
> PS: right now i have a solution without extension point, but it would be
> nice to have it done correct!

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Re: Question regarding Extensions [message #1385720 is a reply to message #1385716]

Tue, 10 June 2014 17:02

Ludwig Moser

Messages: 449
Registered: July 2009

Senior Member

I solved it now by a singleton which is in an exported package.
it IS working. But if i add a freature i need to change the singleton and release both. Thats why i searched for the dynamic solution... (and it would be my first extension point) Wink

So curious to get it working with eclipse tools rather than working around

or would you recommend to use singletons?
Btw: my functionality is like a menu or toolbar...

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Re: Question regarding Extensions [message #1385726 is a reply to message #1385720]

Tue, 10 June 2014 17:45

Thomas Schindl

Messages: 6313
Registered: July 2009

Senior Member

I would not use extension points at all but Declarative Services. I
still I think I don't fully understand what you are talking about but i
think what you talk about is similar to the so called registries we use
in the platform e.g. EditorRegistry, ViewRegistry, ... .

Tom

On 10.06.14 19:03, Ludwig Moser wrote:
> I solved it now by a singleton which is in an exported package.
> it IS working. But if i add a freature i need to change the singleton
> and release both. Thats why i searched for the dynamic solution... (and
> it would be my first extension point) ;)
> So curious to get it working with eclipse tools rather than working around
>
> or would you recommend to use singletons?
> Btw: my functionality is like a menu or toolbar...

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Re: Question regarding Extensions [message #1385732 is a reply to message #1385726]

Tue, 10 June 2014 18:31

Ludwig Moser

Messages: 449
Registered: July 2009

Senior Member

Using an osgi service would be possible. Will try that tomorrow. Thanks for your suggeston!

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