[Chinook] Re: Chinook_for_Brain_research

[Stephen Montgomery]

Hi

Yes this is already set up through the ApplicationClient class where you 
can ask individual servers how many jobs are they processing.  The 
mediator could uses the mode "RMI" or "WSDL" and the endpoint URI 
"http:/chinook01:8080/axis/services/ApplcationServerImpl" when 
instantiating the ApplicationClient and then determine which one is the 
fastest.  To get this information, use the ServiceManager (it is a 
singleton) and ask for the services in the cache.  Each service has a 
getServiceLocation (the endpoint) and a getMode method (which are in 
turn the parameters to pass to the ApplicationClient.

Here is an example:

Service[] services = ServiceManager.getInstance().getKnownServices();
Service idleService;
int count = -1;
for (int i = 0; i < services.length; i++) {
    if (services.getService().equals("MYSERVICENAME")) {
       try {
            ApplicationClient ac = new 
ApplicationClient(service.getMode(), service.getService());
            int c = ac.jobsBeingProcessedOnServerCount();    
           if (count == -1 || c < count) {
             idleService = service[i];
            count = c;
          }

       } catch (ServiceFailedException sfe) {
          //the server is unavailable, or is running a 
backwards-incompatible version of the remote interface
       }
    }
}

The use the idleService to forward your job to (with the JobManager 
class, also a singleton) method
public synchronized Integer runJob(Service service, DefaultParameter[] 
app_params,
                        DEOSet[] deosets)

Hth.
Stephen



astakhov wrote:

> About Chinook.
>
> I install (with some minor modification) a few Chinook nodes  here at 
> UCSD.
> I attached several our servers that we call mediators to that nodes.We 
> made couple wrappers integrate Mediators with Chinook.
>
> Now, we have several client application (Java) that can be used to 
> send requests to Mediators. I would like to use Chinook as a light 
> fraimwork (simular to Globus but without Globus overhead).
>
> Currently, each Chinook server (I run 3 ) handle multiple Mediator 
> Servers (I run 4).
> So, my java client probably can send request over RMI/SSL to Chinook 
> Client that can see which Chinook Server less busy (has less submitted 
> jobs) and send request through less bussy Chinook Server to one of 
> Mediator.
>
> This is our typical case . Can we do that ?
>
> Vadim.