qbit/core/src/main/java/io/advantageous/qbit/service/discovery/impl/ServiceDiscoveryImpl.java
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();
            }
        }
    }
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();
            }
        }
    }
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.