Re: [ecf-dev] ServiceTracker for remote services

[Eugen Reiswich <reiswich@xxxxxx>]

Hi Scott,

thanks for your reply. I guess I will check out  the  
RemoteServiceTracker and look whether he does what we need.

Regards,
Eugen

Am May 11, 2009 um 19:33  schrieb Scott Lewis:

> Hi Eugen,
>
> Eugen Reiswich wrote:
> > Hi all,
> >
> > I'm using ECF over XMPP with an Jabber-Server. What I need is the  
> > functionallity similar to an OSGi ServiceTracker. Is there  
> > something comparable in ECF?
>
> There is, but it's not yet thoroughly tested.  It's a  
> 'RemoteServiceTracker', in  
> org.eclipse.ecf.remoteservice.util.tracker.RemoteServiceTracker.
>
> > When I start my application I need the ability:
> > 1. to search for remote services already provided by my online  
> > clients
> > 2. I also want to be informed about new service registrations if a  
> > new client logs in and offers his remote services
> >
> > Can the ECF ServiceDiscovery-API be used to deal with this problem?
>
> Yes.
>
> > If yes, how would I use the ServiceDiscoveryAPI to create a  
> > ServiceTracker for ECF-remote-services?
>
> Well, the discovery API can deliver arbitrary service  
> properties...and these service properties can include things like  
> the targetID...that can be used to to create a proxy for a client  
> that is discovered...e.g.
>
> IRemoteServiceReference[] ref =  
> containerAdapter.getRemoteServiceReferences(targetID,interface,null);
> IRemoteService rs = containerAdapter.getRemoteService(ref[0]);
> Object proxy = rs.getProxy();
>
> But one thing to say about this:  what is being described here is  
> basically what the ECF implementation of RFC119 does...that is, it  
> gets meta-data about discovered services from the discovery service  
> properties, and then calls  
> containerAdapter 
> .getRemoteServiceReferences(targetID,interface,props) for you...then  
> creates a proxy and puts it in the local service registry (where a  
> ServiceTracker for that service will then be notified).
>
> You can see test code that tests this mechanism (the RFC119 impl) in  
> the org.eclipse.ecf.tests.osgi.services.distribution test bundle.   
> In there are some test cases where a ServiceTracker is used so that  
> client code can be notified when a remote service is discovered,  
> lookedup, and then added to the local service registry (see  
> org 
> .eclipse 
> .ecf 
> .tests 
> .osgi.services.distribution.AbstractServiceRegisterTest.testGetProxy  
> for example).
>
> Thanks,
>
> Scott
>
>
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