springcloud9----feign-client-without-hystrix

Posted 2020-11-11 672530440

package com.itmuch.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;

@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class ConsumerMovieFeignApplication {
  public static void main(String[] args) {
    SpringApplication.run(ConsumerMovieFeignApplication.class, args);
  }
}

package com.itmuch.cloud.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

import com.itmuch.cloud.entity.User;
import com.itmuch.cloud.feign.FeignClient2;
import com.itmuch.cloud.feign.UserFeignClient;

@RestController
public class MovieController {

  @Autowired
  private UserFeignClient userFeignClient;

  //禁用FeignClient2的Hystrix，就要在Configuration2里面配置。
  //Feign对Hystrix的禁用可以到某一个Client，如果在yml文件配置feign.hystrix.enabled=flase则所有的feign client都禁用了。
  @Autowired
  private FeignClient2 feignClient2;

  @GetMapping("/movie/{id}")
  public User findById(@PathVariable Long id) {
    return this.userFeignClient.findById(id);
  }

  @GetMapping("/{serviceName}")
  public String findServiceInfoFromEurekaByServiceName(@PathVariable String serviceName) {
    return this.feignClient2.findServiceInfoFromEurekaByServiceName(serviceName);
  }
}

package com.itmuch.cloud.feign;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import com.itmuch.config.Configuration2;

//禁用FeignClient2的Hystrix，就要在Configuration2里面配置。
@FeignClient(name = "xxxx", url = "http://localhost:8761/", configuration = Configuration2.class, fallback = FeignClient2Fallback.class)
public interface FeignClient2 {
  @RequestMapping(value = "/eureka/apps/{serviceName}")
  public String findServiceInfoFromEurekaByServiceName(@PathVariable("serviceName") String serviceName);
}

package com.itmuch.cloud.feign;

public class FeignClient2Fallback implements FeignClient2 {

  @Override
  public String findServiceInfoFromEurekaByServiceName(String serviceName) {
    return "haha";
  }

}

package com.itmuch.cloud.feign;

import org.springframework.stereotype.Component;

import com.itmuch.cloud.entity.User;

@Component
public class HystrixClientFallback implements UserFeignClient {

  @Override
  public User findById(Long id) {
    User user = new User();
    user.setId(0L);
    return user;
  }
}

package com.itmuch.cloud.feign;

import org.springframework.cloud.netflix.feign.FeignClient;

import com.itmuch.cloud.entity.User;
import com.itmuch.config.Configuration1;

import feign.Param;
import feign.RequestLine;

@FeignClient(name = "microservice-provider-user", configuration = Configuration1.class, fallback = HystrixClientFallback.class)
public interface UserFeignClient {
  @RequestLine("GET /simple/{id}")
  public User findById(@Param("id") Long id);
}

package com.itmuch.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import feign.Contract;
import feign.Logger;

@Configuration
public class Configuration1 {
  @Bean
  public Contract feignContract() {
    return new feign.Contract.Default();
  }

  @Bean
  Logger.Level feignLoggerLevel() {
    return Logger.Level.FULL;
  }
}

package com.itmuch.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;

import feign.Feign;
import feign.auth.BasicAuthRequestInterceptor;

@Configuration
public class Configuration2 {
  @Bean
  public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {
    return new BasicAuthRequestInterceptor("user", "password123");
  }

  //Configuration2里面加上这个就禁用了FeignClient2的Hystrix
  @Bean
  @Scope("prototype")
  public Feign.Builder feignBuilder() {
    //feignBuilder方法默认返回HystrixFeign.Builder也就是说Feign默认支持Hystrix
    //现在改成Feign.Builder就禁用了Hystrix的支持
    return Feign.builder();
  }
}

spring:
  application:
    name: microservice-consumer-movie-feign-customizing-without-hystrix
server:
  port: 7901
eureka:
  client:
    healthcheck:
      enabled: true
    serviceUrl:
      defaultZone: http://user:password123@localhost:8761/eureka
  instance:
    prefer-ip-address: true
logging:
  level:
    com.itmuch.cloud.feign.UserFeignClient: DEBUG

# 解决第一次请求报超时异常的方案：
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: 5000
# 或者：
# hystrix.command.default.execution.timeout.enabled: false
# 或者：

# 超时的issue：https://github.com/spring-cloud/spring-cloud-netflix/issues/768
# 超时的解决方案： http://stackoverflow.com/questions/27375557/hystrix-command-fails-with-timed-out-and-no-fallback-available
# hystrix配置： https://github.com/Netflix/Hystrix/wiki/Configuration#execution.isolation.thread.timeoutInMilliseconds

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservice-consumer-movie-feign-customizing-without-hystrix</artifactId>
    <packaging>jar</packaging>

    <parent>
        <groupId>com.itmuch.cloud</groupId>
        <artifactId>microservice-spring-cloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>
    </dependencies>
</project>