Ribbon负载均衡算法原理与使用介绍

@GetMapping(value = "/payment/lb")
    public String getPaymentLB()
    {
        return serverPort;
    }

public interface LoadBalancer
{
    ServiceInstance instances(List<ServiceInstance> serviceInstances);
}
 

@Component
public class MyLB implements LoadBalancer
{
    private AtomicInteger atomicInteger = new AtomicInteger(0);
    public final int getAndIncrement()
    {
        int current;
        int next;
        do
        {
            current = this.atomicInteger.get();
            next = current >= 2147483647 ? 0 : current + 1;
        } while(!this.atomicInteger.compareAndSet(current, next));
        System.out.println("*****next: "+next);
        return next;
    }
    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances)
    {
        int index = getAndIncrement() % serviceInstances.size();
        return serviceInstances.get(index);
    }
}

 @Resource
    private RestTemplate restTemplate;
    //可以获取注册中心上的服务列表
    @Resource
    private DiscoveryClient discoveryClient;
    @Resource
    private LoadBalancer loadBalancer;
@GetMapping("/consumer/payment/lb")
    public String getPaymentLB()
    {
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
        if(instances == null || instances.size()<=0) {
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }