LOAD BALANCING

 IpPool.java:

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

public class IpPool {

    public static Map<String, Integer> ipMap = new ConcurrentHashMap<>();

    static {

        ipMap.put("192.168.1.1", 10);

        ipMap.put("192.168.1.2", 10);

        ipMap.put("192.168.1.3", 10);

        ipMap.put("192.168.1.4", 10);

        ipMap.put("192.168.1.5", 10);

        ipMap.put("192.168.1.6", 10);

        ipMap.put("192.168.1.7", 10);

        ipMap.put("192.168.1.8", 10);

        ipMap.put("192.168.1.9", 10);

        ipMap.put("192.168.1.10", 10);

    }

}

LoadBalance.java:Interface

public interface LoadBalance {

    String getServer(String clientIp);

}

RoundRobin.java:

import java.util.ArrayList;

import java.util.List;

import java.util.Set;

public class RoundRobin implements LoadBalance {

    private static Integer position = 0;

    @Override

    public String getServer(String clientIp) {

        Set<String> servers = IpPool.ipMap.keySet();

        List<String> serverList = new ArrayList<>();

        serverList.addAll(servers);

        String target = null;

        synchronized (position) {

            if (position > serverList.size() - 1) {

                position = 0;

            }

            target = serverList.get(position);

            position++;

        }

        return target;

    }

}

LoadBalanceMain.java:

public class LoadBalanceMain {

    public static void main(String[] args) {

        run();

    }

    public static void run() {

        loadBalance();

    }

    public static void loadBalance() {

        doGetServer(new RoundRobin());

        

    }

    public static void doGetServer(LoadBalance loadBalance) {

        doGetServer(loadBalance, 100);

    }

    private static void doGetServer(LoadBalance loadBalance, int queryTimes) {

        for (int i = 0; i < queryTimes; i++) {

            String serverId = loadBalance.getServer(String.valueOf(i));

            System.out.println(String.format("[%s] index:%s,%s", loadBalance.getClass().getSimpleName(), i, serverId));

        }

    }

}

Output: