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org.eclipse.scout.service.services service vs. proxy [message #1220233]

Tue, 10 December 2013 09:17

Eclipse User

Hello

I have a question regarding service registration through the org.eclipse.scout.service.services extension point. A service can be registered through a service node or a proxy node. I wonder what the difference is between:

   <extension
         name=""
         point="org.eclipse.scout.service.services">
      <proxy
            factory="org.eclipse.scout.rt.client.services.ClientProxyServiceFactory"
            class="test.shared.services.IDesktopService">
      </proxy>
   </extension>

and

   <extension
         name=""
         point="org.eclipse.scout.service.services">
      <service
            factory="org.eclipse.scout.rt.client.services.ClientProxyServiceFactory"
            class="test.shared.services.IDesktopService">
      </service>
   </extension>

I've tried both on the client side and both appear to work just fine. Is there any difference? Should I use proxy on the client side?

Thank you
Benno

Re: org.eclipse.scout.service.services service vs. proxy [message #1220266 is a reply to message #1220233]

Tue, 10 December 2013 13:06

Eclipse User

I remember that someone told me, that this is legacy stuff (the difference between service and proxy)... I both cases you get a proxy-service that will connect to the server (see the Client/Server communication page).

I think this is something we should clean up... I will ask or check the code... and let you know...

Thank you for bringing this point in the forum for discussion.

Re: org.eclipse.scout.service.services service vs. proxy [message #1220350 is a reply to message #1220266]

Wed, 11 December 2013 04:15

Eclipse User

Inputs from Andreas Bur:

Code:
org.eclipse.scout.service.internal.ServicesExtensionManager

With a proxy registration:
- factory is mandatory
- you can only register interfaces (if you try to register a class with a proxy it will be ignored)
- default ServiceRanking is -2

With a service registration:
- factory can be omitted (default factory is used)
- you register Interfaces and classes
- default ServiceRanking is 0

Both are very similar, in a lot of cases you can use proxy or service registration... In your example, only the "service ranking" is different.

Feel free to make a proposal, if you think we should improve something in this domain.

Re: org.eclipse.scout.service.services service vs. proxy [message #1220354 is a reply to message #1220350]

Wed, 11 December 2013 04:26

Eclipse User

Thank you very much for your answers. I think I'm going to use service everywhere with a proxy factory on the client side for consistency reasons.

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