Re: DOSGI Service load balancing

[Sergey Beryozkin <sb...@gmail.com>]

Hi
On 31/08/12 15:30, Spandit2 wrote:
> Sergey
>
> Thanks for your quick response and sharing these two approaches . To me it
> looks like this approach will work if the web service consumer is running
> inside same container . Unfortunately client for my services is application
> running on force.com . So the load balancing and fail over has to be
> something outside and supported by container .
>
> I am thinking of implementing a Proxy service as a plain cxf web service
> (Not OSGI Service) . This Proxy service can then go to service registry ,
> get the list of available services and then execute the local service or
> service from other node to support fail over.
>
> The proxy service will be exposed on HTTP port (and not on osgi-http port on
> jboss) and therefore can be load balanced by the Jboss AS 7 Web container.
>
> I also read blog by David Bosschaert
>
> http://coderthoughts.blogspot.com/2009/02/distributed-osgi-simple-example.html.
>
> In one of the response he said
>
> "A service has arbitrary map of properties associated with it ."  These
> properties can be passed to the ServiceTracker as a filter for selecting a
> service when same service is registered/listed in service registry multiple
> times. " A service could publish* (and periodically update) *a property
> which advertises its load and the load balancer could automatically select
> the service with the lowest load"
>
> Question is I know how to set the properties on service during registration
> . But how do I update these properties ?

I guess this is better to be managed by having Activator implementing 
ManagedService, where it can then update the properties of individual 
services it publishes. May be DSW itself can itself publish every 
service it creates as ManagedService, but the question there is how to 
allocate unique, descriptive ids to such services, in cases when say the 
same interface is published on different ports, etc

Sergey

>
> Thanks
> Sunil
>
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