code: private void populateServiceMap(final String serviceName,
                                      final List<EndpointDefinition> healthyServices) {
  
          final ServicePool servicePool = servicePool(serviceName);
  
          /* If there were changes then send a service pool change event on the event channel. */
          if (servicePool.setHealthyNodes(healthyServices)) {
              serviceChangedEventChannel.servicePoolChanged(serviceName);
              serviceChangedEventChannel.flushEvents();
          }
  
          final BlockingQueue<Callback<List<EndpointDefinition>>> callbacks = callbackMap.get(serviceName);
  
          if (callbacks != null) {
              Callback<List<EndpointDefinition>> callback = callbacks.poll();
              while (callback != null) {
                  callback.resolve(healthyServices);
                  callback = callbacks.poll();
              }
          }
      }
docs: Populate the service map.
  Look up the service pool.
  Apply the healthy services so the pool can see if there were changes (additions, removal, etc.)
  
  @param serviceName     service name
  @param healthyServices list of healthy services that we just loaded.