1. 一般轮询算法
服务器类
- package com.sosop.roundRobin;
- public class Server {
- private String ip;
- private int weight;
- public Server(String ip) {
- super();
- this.ip = ip;
- }
- public Server(String ip, int weight) {
- this.ip = ip;
- this.weight = weight;
- }
- public String getIp() {
- return ip;
- }
- public void setIp(String ip) {
- this.ip = ip;
- }
- public int getWeight() {
- return weight;
- }
- public void setWeight(int weight) {
- this.weight = weight;
- }
- @Override
- public String toString() {
- return "Server [ip=" + ip + ", weight=" + weight + "]";
- }
- }
实现与测试
- package com.sosop.roundRobin;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.concurrent.BrokenBarrierException;
- import java.util.concurrent.CyclicBarrier;
- public class NormalRoundRobin {
- private List<Server> servers;
- private int currentIndex;
- private int totalServer;
- public NormalRoundRobin() {
- servers = new ArrayList<>();
- servers.add(new Server("192.168.1.2"));
- servers.add(new Server("192.168.1.3"));
- servers.add(new Server("192.168.1.4"));
- servers.add(new Server("192.168.1.5"));
- servers.add(new Server("192.168.1.6"));
- servers.add(new Server("192.168.1.7"));
- servers.add(new Server("192.168.1.8"));
- totalServer = servers.size();
- currentIndex = totalServer - 1;
- }
- // 轮询
- public Server round() {
- currentIndex = (currentIndex + 1) % totalServer;
- return servers.get(currentIndex);
- }
- public static void main(String[] args) {
- final NormalRoundRobin r = new NormalRoundRobin();
- // 不带并发的轮询
- for (int i = 0; i < 14; i++) {
- System.out.println(r.round());
- }
- System.out.println();
- System.out.println("==========================");
- System.out.println();
- final CyclicBarrier b = new CyclicBarrier(14);
- // 带并发的轮询
- for (int i = 0; i < 14; i++) {
- new Thread(new Runnable() {
- @Override
- public void run() {
- try {
- b.await();
- System.out.println(Thread.currentThread().getName() + " " + r.round());
- } catch (InterruptedException | BrokenBarrierException e) {
- e.printStackTrace();
- }
- }
- }, "thread" + i).start();
- }
- }
- }
结果:
Server [ip=192.168.1.2, weight=0]
Server [ip=192.168.1.3, weight=0]
Server [ip=192.168.1.4, weight=0]
Server [ip=192.168.1.5, weight=0]
Server [ip=192.168.1.6, weight=0]
Server [ip=192.168.1.7, weight=0]
Server [ip=192.168.1.8, weight=0]
Server [ip=192.168.1.2, weight=0]
Server [ip=192.168.1.3, weight=0]
Server [ip=192.168.1.4, weight=0]
Server [ip=192.168.1.5, weight=0]
Server [ip=192.168.1.6, weight=0]
Server [ip=192.168.1.7, weight=0]
Server [ip=192.168.1.8, weight=0]
==========================
thread13 Server [ip=192.168.1.2, weight=0]
thread4 Server [ip=192.168.1.6, weight=0]
thread3 Server [ip=192.168.1.5, weight=0]
thread1 Server [ip=192.168.1.3, weight=0]
thread12 Server [ip=192.168.1.7, weight=0]
thread0 Server [ip=192.168.1.2, weight=0]
thread2 Server [ip=192.168.1.4, weight=0]
thread10 Server [ip=192.168.1.6, weight=0]
thread11 Server [ip=192.168.1.5, weight=0]
thread8 Server [ip=192.168.1.3, weight=0]
thread9 Server [ip=192.168.1.4, weight=0]
thread7 Server [ip=192.168.1.2, weight=0]
thread6 Server [ip=192.168.1.8, weight=0]
thread5 Server [ip=192.168.1.7, weight=0]
2.加权轮询
- package com.sosop.roundRobin;
- import java.math.BigInteger;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.concurrent.BrokenBarrierException;
- import java.util.concurrent.CyclicBarrier;
- public class WeightRoundRobin {
- private List<Server> servers;
- private int currentIndex;
- private int totalServer;
- private int currentWeight;
- private int maxWeight;
- private int gcdWeight;
- public WeightRoundRobin() {
- servers = new ArrayList<>();
- servers.add(new Server("192.168.1.2", 5));
- servers.add(new Server("192.168.1.3", 10));
- servers.add(new Server("192.168.1.4", 15));
- servers.add(new Server("192.168.1.5", 100));
- servers.add(new Server("192.168.1.6", 5));
- servers.add(new Server("192.168.1.7", 20));
- servers.add(new Server("192.168.1.8", 30));
- totalServer = servers.size();
- currentIndex = totalServer - 1;
- maxWeight = maxWeight();
- gcdWeight = serverGcd();
- }
- public Server round() {
- while (true) {
- currentIndex = (currentIndex + 1) % totalServer;
- if (currentIndex == 0) {
- currentWeight = currentWeight - gcdWeight;
- if (currentWeight <= 0) {
- currentWeight = maxWeight;
- if(currentWeight == 0) {
- return null;
- }
- }
- }
- if(servers.get(currentIndex).getWeight() >= currentWeight) {
- return servers.get(currentIndex);
- }
- }
- }
- /**
- * 返回所有服务器的权重的最大公约数
- *
- * @return
- */
- private int serverGcd() {
- int comDivisor = 0;
- for (int i = 0; i < totalServer - 1; i++) {
- if (comDivisor == 0) {
- comDivisor = gcd(servers.get(i).getWeight(), servers.get(i + 1).getWeight());
- } else {
- comDivisor = gcd(comDivisor, servers.get(i + 1).getWeight());
- }
- }
- return comDivisor;
- }
- /**
- * 获得服务器中的最大权重
- *
- * @return
- */
- private int maxWeight() {
- int max = servers.get(0).getWeight();
- int tmp;
- for (int i = 1; i < totalServer; i++) {
- tmp = servers.get(i).getWeight();
- if (max < tmp) {
- max = tmp;
- }
- }
- return max;
- }
- /**
- * 求两个数的最大公约数 4和6最大公约数是2
- *
- * @param num1
- * @param num2
- * @return
- */
- private int gcd(int num1, int num2) {
- BigInteger i1 = new BigInteger(String.valueOf(num1));
- BigInteger i2 = new BigInteger(String.valueOf(num2));
- return i1.gcd(i2).intValue();
- }
- public static void main(String[] args) {
- final WeightRoundRobin wr = new WeightRoundRobin();
- // 非并发情况
- for (int i = 0; i < 100; i++) {
- System.out.println(wr.round());
- }
- System.out.println();
- System.out.println("==========");
- System.out.println();
- final CyclicBarrier b = new CyclicBarrier(30);
- // 并发情况
- for (int i = 0; i < 30; i++) {
- new Thread(new Runnable() {
- @Override
- public void run() {
- try {
- b.await();
- System.out.println(Thread.currentThread().getName() + " " + wr.round());
- } catch (InterruptedException | BrokenBarrierException e) {
- e.printStackTrace();
- }
- }
- }, "thread" + i).start();
- }
- }
- }
结果:
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.4, weight=15]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.3, weight=10]
Server [ip=192.168.1.4, weight=15]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.2, weight=5]
Server [ip=192.168.1.3, weight=10]
Server [ip=192.168.1.4, weight=15]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.6, weight=5]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.4, weight=15]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.3, weight=10]
Server [ip=192.168.1.4, weight=15]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.2, weight=5]
Server [ip=192.168.1.3, weight=10]
Server [ip=192.168.1.4, weight=15]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.6, weight=5]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.4, weight=15]
Server [ip=192.168.1.5, weight=100]
Server [ip=192.168.1.7, weight=20]
Server [ip=192.168.1.8, weight=30]
Server [ip=192.168.1.3, weight=10]
==========
thread0 Server [ip=192.168.1.5, weight=100]
thread3 Server [ip=192.168.1.2, weight=5]
thread7 Server [ip=192.168.1.6, weight=5]
thread10 Server [ip=192.168.1.5, weight=100]
thread12 Server [ip=192.168.1.5, weight=100]
thread15 Server [ip=192.168.1.5, weight=100]
thread18 Server [ip=192.168.1.5, weight=100]
thread2 Server [ip=192.168.1.8, weight=30]
thread29 Server [ip=192.168.1.5, weight=100]
thread1 Server [ip=192.168.1.7, weight=20]
thread27 Server [ip=192.168.1.8, weight=30]
thread26 Server [ip=192.168.1.5, weight=100]
thread25 Server [ip=192.168.1.8, weight=30]
thread24 Server [ip=192.168.1.5, weight=100]
thread23 Server [ip=192.168.1.5, weight=100]
thread22 Server [ip=192.168.1.5, weight=100]
thread21 Server [ip=192.168.1.5, weight=100]
thread20 Server [ip=192.168.1.5, weight=100]
thread19 Server [ip=192.168.1.5, weight=100]
thread17 Server [ip=192.168.1.5, weight=100]
thread16 Server [ip=192.168.1.5, weight=100]
thread14 Server [ip=192.168.1.5, weight=100]
thread13 Server [ip=192.168.1.5, weight=100]
thread11 Server [ip=192.168.1.5, weight=100]
thread9 Server [ip=192.168.1.8, weight=30]
thread8 Server [ip=192.168.1.7, weight=20]
thread6 Server [ip=192.168.1.5, weight=100]
thread5 Server [ip=192.168.1.4, weight=15]
thread4 Server [ip=192.168.1.3, weight=10]
thread28 Server [ip=192.168.1.5, weight=100]
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