SpringCloud：spring-cloud-loadbalancer原理分析及实现自定义负载均衡策略

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.RequestData;
import org.springframework.cloud.loadbalancer.core.NoopServiceInstanceListSupplier;
import org.springframework.cloud.loadbalancer.core.ReactiveLoadBalancer;
import org.springframework.cloud.loadbalancer.core.SelectedInstance;
import reactor.core.publisher.Mono;
 
import java.util.List;
 
public class CustomLoadBalancer implements ReactiveLoadBalancer<ServiceInstance> {
 
    private final ServiceInstanceListSupplier serviceInstanceListSupplier;
 
    public CustomLoadBalancer(List<ServiceInstance> serviceInstances) {
        this.serviceInstanceListSupplier = new StaticServiceInstanceListSupplier(serviceInstances);
    }
 
    @Override
    public Mono<Response<ServiceInstance>> choose(RequestData requestData) {
        // 实现自定义的选择逻辑，例如轮询、随机或者根据权重
        return serviceInstanceListSupplier.get()
                .next()
                .map(serviceInstance -> new Response<>(serviceInstance));
    }
 
    @Override
    public Mono<Void> execute(String serviceId, Function<ServiceInstance, Mono<Void>> callback) {
        // 使用choose方法选择一个实例，然后执行callback中的逻辑
        return choose(new DefaultRequestData(serviceId)).flatMap(response -> {
            SelectedInstance selectedInstance = new SelectedInstance(serviceId, response.getServer());
            return callback.apply(selectedInstance.getServer());
        });
    }
 
    // 内部辅助类，用于提供服务实例列表
    private static class StaticServiceInstanceListSupplier implements ServiceInstanceListSupplier {
        private final List<ServiceInstance> serviceInstances;
 
        public StaticServiceInstanceListSupplier(List<ServiceInstance> serviceInstances) {
            this.serviceInstances = serviceInstances;
        }
 
        @Override
        public Flux<List<ServiceInstance>> get() {
            return Flux.just(serviceInstances);
        }
 
        @Override
        public Flux<ServiceInstance> get(RequestData requestData) {
            return Flux.fromIterable(serviceInstances);
        }
    }
}

这个代码示例展示了如何实现一个自定义的ReactiveLoadBalancer。在choose方法中，我们使用了一个简单的轮询策略来选择服务实例。在execute方法中，我们使用choose选出的实例来执行传入的回调函数。这个示例还定义了一个辅助类StaticServiceInstanceListSupplier来提供服务实例列表。这个示例只是用于教学目的，实际应用中应该根据具体的负载均衡策略来实现choose方法。