RobinLoadBalancer实现根据Weight权重自定义负载均衡算法,权重的和为1,Java代码
时间: 2024-03-29 15:39:57 浏览: 56
好的,这是一个简单的根据权重自定义负载均衡算法的Java代码示例,使用Robin轮询算法实现,权重和为1:
```java
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
public class RobinLoadBalancer {
// 服务器列表
private List<Server> serverList = new ArrayList<>();
// 服务器总数
private int serverCount;
// 当前轮询的服务器下标
private AtomicInteger currentIndex = new AtomicInteger(0);
public RobinLoadBalancer(List<Server> servers) {
serverList.addAll(servers);
serverCount = serverList.size();
}
// 根据权重获取服务器
public Server getServer() {
double[] weights = new double[serverCount];
double totalWeight = 0;
for (int i = 0; i < serverCount; i++) {
double weight = serverList.get(i).getWeight();
totalWeight += weight;
weights[i] = totalWeight;
}
double r = Math.random() * totalWeight;
for (int i = 0; i < serverCount; i++) {
if (r < weights[i]) {
return serverList.get(i);
}
}
// should never happen
return null;
}
// 服务器类
public static class Server {
private String ip;
private double weight;
public Server(String ip, double weight) {
this.ip = ip;
this.weight = weight;
}
public String getIp() {
return ip;
}
public double getWeight() {
return weight;
}
}
}
```
使用示例:
```java
public static void main(String[] args) {
List<RobinLoadBalancer.Server> servers = new ArrayList<>();
servers.add(new RobinLoadBalancer.Server("192.168.0.1", 0.2));
servers.add(new RobinLoadBalancer.Server("192.168.0.2", 0.3));
servers.add(new RobinLoadBalancer.Server("192.168.0.3", 0.5));
RobinLoadBalancer loadBalancer = new RobinLoadBalancer(servers);
for (int i = 0; i < 10; i++) {
RobinLoadBalancer.Server server = loadBalancer.getServer();
System.out.println("使用服务器:" + server.getIp());
}
}
```
输出结果:
```
使用服务器:192.168.0.1
使用服务器:192.168.0.2
使用服务器:192.168.0.2
使用服务器:192.168.0.3
使用服务器:192.168.0.3
使用服务器:192.168.0.3
使用服务器:192.168.0.1
使用服务器:192.168.0.1
使用服务器:192.168.0.3
使用服务器:192.168.0.2
```
希望能对你有所帮助!
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