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Eclipse like extension points in WebApp [message #995630]

Sun, 30 December 2012 13:26

Eclipse User

Hey,

In Eclipse, we use OSGI but also the concept of "Extension point" and Extension point implementers.
Did you think of such a mecanism for WebApp ?

I think about a mechanism with a kind of extension point registry where a WebApp can register extension points and other WepApp can register implementers of these extension points. A WebApp can then ask for "implementers" dynamically and then, like in Eclipse, extends itself with known interfaces implementers.

Maybe there is an existing mechanism to do it with Virgo ?

Thanks for any answer

Re: Eclipse like extension points in WebApp [message #996623 is a reply to message #995630]

Wed, 02 January 2013 09:40

Eclipse User

Check out the Virgo snaps framework for dynamic extensibility of web apps. Snaps pre-reqs Virgo Server for Apache Tomcat.

Re: Eclipse like extension points in WebApp [message #997212 is a reply to message #996623]

Fri, 04 January 2013 08:43

Eclipse User

Thanks for your answer but it's not what I'm looking for.
Maybe I should not speak about WebApp or maybe I'm not clear enough.

What I'm looking for is a mechanism which help me to make this "scenario" possible.

1- "Inside" WebApp1, I define an extension point EP1
2- In WebApp2 and WebApp3 or "somewhere", I create an implementation of EP1, lets says IMP1 et IMP2
3- When WebApp1 starts, it can look for implementations of EP1 ...IMP1 and IMP2 will be discovered
4- WebApp1 uses IMP1 and IMP2

Extension Points are for the "server side" of my WebApp, not for the UI part.

Thanks if you've any idea.............if I'm clear Sad

[Updated on: Fri, 04 January 2013 08:43] by Moderator

Re: Eclipse like extension points in WebApp [message #997295 is a reply to message #997212]

Fri, 04 January 2013 21:24

Eclipse User

Hi

WebApp1 could provide a service interface and WebApp2/3 could import the interface and register their own implementation for it. Once WebApp1 needs an implementation of the interface it can look up registered implementations (e.g. whiteboard pattern). With rankings and properties/filters you can even ensure that only matching implementations are used. There is no need for a specific extension point registry imo as the OSGi service registry already provides all you need to achieve this.

BR
Frieder

[Updated on: Fri, 04 January 2013 21:30] by Moderator

Re: Eclipse like extension points in WebApp [message #1005766 is a reply to message #997295]

Mon, 28 January 2013 11:29

Eclipse User

Hi Erik,

I am using the Equinox Extension Registry in Virgo.
It needs a bit of tweaking, but it works.

Giamma.

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