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Copyright 2014 Cisco Systems, Inc. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
A RoundRobin LoadBalancer abstract template based on DirectoryLookupService.
public class RoundRobinLoadBalancer implements ServiceInstanceLoadBalancer{

The Round Robin position index.
    private final AtomicInteger index;

    public RoundRobinLoadBalancer(){
        this. = new AtomicInteger(0);

Vote a ServiceInstance based on the RoundRobin LoadBalancer algorithm.

the voted ServiceInstance.
    public ServiceInstance vote(List<ServiceInstanceinstances) {
        if (instances.isEmpty()) {
          return null;
        int i = .getAndIncrement();
        int pos = i % instances.size();
        ServiceInstance instance = instances.get(pos);
        return instance;
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