SpringCloud--服务接口调用--Ribbon原理分析

1. Ribbon的负载均衡轮询的原理：
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   9. package com.model.lb;
      
      import org.springframework.cloud.client.ServiceInstance;
      
      import java.util.List;
      
      /**
       * @Description:测试类
       * @Author: 张紫韩
       * @Crete 2021/9/8 16:09
       */
      public interface LoadBalancer {
          public ServiceInstance instances(List<ServiceInstance> serviceInstances);
      }

   10. package com.model.lb;
       
       import org.springframework.cloud.client.ServiceInstance;
       import org.springframework.cloud.client.loadbalancer.LoadBalanced;
       import org.springframework.stereotype.Component;
       
       import java.lang.annotation.Annotation;
       import java.util.List;
       import java.util.concurrent.atomic.AtomicInteger;
       
       /**
        * @Description:测试类
        * @Author: 张紫韩
        * @Crete 2021/9/8 16:09
        */
       @Component
       public class LoadBalancerImpl 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("******************第"+current+"次访问******************");
               return next;
           }
           @Override
           public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
               int index=getAndIncrement()%serviceInstances.size();
               return serviceInstances.get(index);
           }
       }

   11. public String getPaymentLB(){
               String serviceName="SPRINGCLOUD001-PROVIDER-PAYMENT";
               List<ServiceInstance> instances = discoveryClient.getInstances(serviceName);
               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);
           }

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