| ExtensionPoint or RegisterService? [message #77987] |
Mon, 27 November 2006 12:01  |
Eclipse User |
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Originally posted by: ridcully560.yahoo.com
Hello,
in one of my bundles - some kind of main-bundle of a webapp that
consists of many bundles - I'm using a ServiceTracker together with an
ServiceTrackerCustomizer to react when classes (inside other Plugins)
that implement a certain Interface are registered with the system as a
Service. I use it as a way to get a representation of those other
plugins insinde some kind of PluginService inside the main-plugin.
I think that I somehow just do the same that I could achive by using
ExtesionPoints. It seems to me that by using ExtensionPoints I would not
have to bother about the registering, but still about searching for
installed plugins of a certain kind. And would then have to get them
inside my PluginService on my own just as I'm doing it now. Am I right
there? So is there a point in switching to ExtensionPoints or can I keep
it the way I'm using it? My way seems to work - but I don't think I'm
using the classes - that I register as a Service just to find them - the
way that registering Services is meant to be.
I hope that was understandable and I got the right newsgroup to ask this.
Johannes
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| Re: ExtensionPoint or RegisterService? [message #78230 is a reply to message #77987] |
Fri, 01 December 2006 04:43  |
| Eclipse User |
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Originally posted by: jeff_mcaffer.REMOVE.ca.ibm.com
Johannes,
Certainly doing what you are doing will work as you have seen. Services
and Extensions are both mechanisms useful when you are trying to glue
components together and allow them to interact. They have a number of
differences in terms of how they work and the nature of the contracts
between the parties involved. You should choose the right approach for
your needs. BJ Hargrave and I gave a talk at the last EclipseCon that
includes some information on this subject. Check out
http://www.eclipsecon.org/2006/Sub.do?id=185
(there should be slides available there).
Jeff
Johannes wrote:
> Hello,
>
> in one of my bundles - some kind of main-bundle of a webapp that
> consists of many bundles - I'm using a ServiceTracker together with an
> ServiceTrackerCustomizer to react when classes (inside other Plugins)
> that implement a certain Interface are registered with the system as a
> Service. I use it as a way to get a representation of those other
> plugins insinde some kind of PluginService inside the main-plugin.
>
> I think that I somehow just do the same that I could achive by using
> ExtesionPoints. It seems to me that by using ExtensionPoints I would not
> have to bother about the registering, but still about searching for
> installed plugins of a certain kind. And would then have to get them
> inside my PluginService on my own just as I'm doing it now. Am I right
> there? So is there a point in switching to ExtensionPoints or can I keep
> it the way I'm using it? My way seems to work - but I don't think I'm
> using the classes - that I register as a Service just to find them - the
> way that registering Services is meant to be.
>
> I hope that was understandable and I got the right newsgroup to ask this.
>
> Johannes
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