/**
* Obtain the UUID of some relatively underutilized data service.
*
* <p>FIXME The LBS should interpret the excludedServiceUUID as the source service UUID and then
* provide a list of those services having an LBS computed service score which is significantly
* lower than the score for this service. Changing this will break some unit tests (for the LBS
* behavior).
*/
private UUID getMoveTarget(
final UUID sourceServiceUUID, final ILoadBalancerService loadBalancerService) {
try {
// request under utilized data service UUIDs (RMI).
final UUID[] uuids =
loadBalancerService.getUnderUtilizedDataServices( //
0, // minCount - no lower bound.
1, // maxCount - no upper bound.
sourceServiceUUID // exclude this data service.
);
if (uuids != null && uuids.length > 0) {
// Found a move target.
return uuids[0];
}
// No move target.
return null;
} catch (TimeoutException t) {
log.warn(t.getMessage());
return null;
} catch (InterruptedException t) {
log.warn(t.getMessage());
return null;
} catch (Throwable t) {
log.error("Could not obtain target service UUIDs: ", t);
return null;
}
}
