标签:return huangml lb org import null public
tags: gray
package com.jack.consul4.config;
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
@Configuration
public class FeignConfiguration implements RequestInterceptor {
private final Logger logger = LoggerFactory.getLogger(getClass());
@Override
public void apply(RequestTemplate template) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
Enumeration<String> headerNames = request.getHeaderNames();
if (headerNames != null) {
while (headerNames.hasMoreElements()) {
String name = headerNames.nextElement();
String values = request.getHeader(name);
template.header(name, values);
if("gray".equals(name)){
RequestTagParam.set(values);
}
}
logger.info("feign interceptor header:{}", template);
}
}
}
package com.jack.consul4.config;
public class RequestTagParam implements AutoCloseable {
private static final ThreadLocal<String> local = new ThreadLocal<>();
public static void set(String s) {
local.set(s);
}
public static String get() {
return local.get();
}
public static void remove() {
local.remove();
}
@Override
public void close(){
local.remove();
}
}
package com.jack.consul4.config;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.consul.discovery.ConsulServer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Random;
/**
* 自定义规则
* @author shengwu ni
*/
public class CustomRule extends AbstractLoadBalancerRule {
/**
* 在choose方法中,自定义我们自己的规则,返回的Server就是具体选择出来的服务
* 自己的规则:按照轮询的规则,但是每个被轮询到的服务调用5次。
* @param o
* @return
*/
@Override public Server choose(Object o) {
// 获取负载均衡器lb
ILoadBalancer lb = getLoadBalancer();
if (lb == null) {
return null;
}
Server server = null;
// 获取可用服务列表
List<Server> upList = lb.getReachableServers();
// 获取所有服务列表
List<Server> allList = lb.getAllServers();
int serverCount = allList.size();
if (serverCount == 0) {
return null;
}
List<Server> grayList = new ArrayList<>();
List<Server> normalList = new ArrayList<>();
Iterator<Server> it = upList.listIterator();
while (it.hasNext()){
Server server1 = it.next();
if (((ConsulServer) server1).getHealthService().getService().getTags().contains("gray")) {
grayList.add(server1);
}else {
normalList.add(server1);
}
}
if (RequestTagParam.get() != null) {
return grayList.get(new Random().nextInt(grayList.size()));
} else {
return normalList.get(new Random().nextInt(normalList.size()));
}
}
@Override
public void initWithNiwsConfig(IClientConfig iClientConfig) {
}
}
标签:return,huangml,lb,org,import,null,public 来源: https://blog.csdn.net/qq_33123895/article/details/117432760
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