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Hystrix作为一款服务治理框架,被使用的很多,但是官方已经不再维护,取而代之的是Resilience4j框架。
所以本文简单介绍Hystrix的使用,把重点放在下一篇的Resilience4j的讲解上。
1、Eureka服务注册和发现
2、一个服务提供者waiter-service
3、基于Feign实现的调用者customer-service,调用waiter-service的方法,服务治理在customer-service上使用。
4、Hsytrix dashboard 用于监控服务调用情况。
1、启动文件:
import com.fasterxml.jackson.datatype.hibernate5.Hibernate5Module;
import java.util.TimeZone;
@SpringBootApplication
@EnableJpaRepositories
@EnableCaching
@EnableDiscoveryClient
public class WaiterServiceApplication implements WebMvcConfigurer {
public static void main(String[] args) {
SpringApplication.run(WaiterServiceApplication.class, args);
}
}
2、POM文件
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>jane.spring.com</groupId>
<artifactId>waiter-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>waiter-service</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>io.micrometer</groupId>
<artifactId>micrometer-registry-prometheus</artifactId>
</dependency>
<dependency>
<groupId>org.joda</groupId>
<artifactId>joda-money</artifactId>
<version>1.0.1</version>
</dependency>
<dependency>
<groupId>org.jadira.usertype</groupId>
<artifactId>usertype.core</artifactId>
<version>6.0.1.GA</version>
</dependency>
<!-- 增加Jackson的Hibernate类型支持 -->
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-hibernate5</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>com.h3database</groupId>
<artifactId>h3</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
3、配置文件:
spring.application.name=waiter-service
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always
info.app.author=DigitalSonic
info.app.encoding=@project.build.sourceEncoding@
eureka.client.service-url.defaultZone=http://127.0.0.1:8761/eureka/
server.port=8091
4、方法文件
import java.util.ArrayList;
import java.util.List;
@RestController
@RequestMapping("/coffee")
@Slf4j
public class CoffeeController {
@Autowired
private CoffeeService coffeeService;
@GetMapping("/{id}")
public Coffee getById(@PathVariable Long id) {
Coffee coffee = coffeeService.getCoffee(id);
log.info("Coffee {}:", coffee);
return coffee;
}
}
5、启动后Eureka效果
1、启动文件
import lombok.extern.slf4j.Slf4j;
import java.util.concurrent.TimeUnit;
@SpringBootApplication
@Slf4j
@EnableDiscoveryClient
@EnableFeignClients
@EnableCircuitBreaker
public class CustomerServiceApplication {
public static void main(String[] args) {
SpringApplication.run(CustomerServiceApplication.class, args);
}
@Bean
public CloseableHttpClient httpClient() {
return HttpClients.custom()
.setConnectionTimeToLive(30, TimeUnit.SECONDS)
.evictIdleConnections(30, TimeUnit.SECONDS)
.setMaxConnTotal(200)
.setMaxConnPerRoute(20)
.disableAutomaticRetries()
.setKeepAliveStrategy(new CustomConnectionKeepAliveStrategy())
.build();
}
}
2、pom文件
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>jane.spring.com</groupId>
<artifactId>customer-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>customer-service</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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-netflix-eureka-client</artifactId>
<version>2.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-httpclient</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.joda</groupId>
<artifactId>joda-money</artifactId>
<version>1.0.1</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.7</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
3、配置文件
server.port=8090
spring.application.name=customer-service
management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always
feign.client.config.default.connect-timeout=500
feign.client.config.default.read-timeout=500
feign.hystrix.enabled=true
eureka.client.service-url.defaultZone=http://127.0.0.1:8761/eureka/
4、控制器url
import java.util.Arrays;
import java.util.List;
@RestController
@RequestMapping("/customer")
@Slf4j
public class CustomerController {
@Autowired
private CoffeeService coffeeService;
@GetMapping("/coffee")
@HystrixCommand(fallbackMethod = "fallbackMethod")
public Coffee getCoffee() {
Coffee list = coffeeService.getById(1l);
log.info("Read coffee: {} coffee", list);
return list;
}
public Coffee fallbackMethod() {
log.warn("Fallback ......");
return null;
}
}
5、fegin客户端
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import java.util.List;
@FeignClient(name = "waiter-service", contextId = "coffee",
qualifier = "coffeeService", path="/coffee",
fallback = FallbackCoffeeService.class)
// 如果用了Fallback,不要在接口上加@RequestMapping,path可以用在这里
public interface CoffeeService {
@GetMapping("/{id}")
Coffee getById(@PathVariable Long id);
}
6、运行后,eureka效果
1、启动文件:
import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
@EnableHystrixDashboard
public class HystrixDashboardDemoApplication {
public static void main(String[] args) {
SpringApplication.run(HystrixDashboardDemoApplication.class, args);
}
@Bean
public ServletRegistrationBean ServletRegistrationBeangetServlet() {
HystrixMetricsStreamServlet streamServlet =new HystrixMetricsStreamServlet();
ServletRegistrationBean registrationBean =new ServletRegistrationBean(streamServlet);
registrationBean.setLoadOnStartup(1);
registrationBean.addUrlMappings("/hystrix.stream");
registrationBean.setName("HystrixMetricsStreamServlet");
return registrationBean;
}
}
2、配置文件
server.port=9090
3、pom文件
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>jane.spring.cloud</groupId>
<artifactId>hystrix-dashboard-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>hystrix-dashboard-demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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-netflix-hystrix-dashboard</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
3、启动后效果如下
4、将地址输入上述文本框,并点击Monitor Stream按钮
http://127.0.0.1:8090/actuator/hystrix.stream
5、调用如下请求:
6、查看Hystrix-dashboard 效果
7、停止waiter-service服务,再次调用,可以看到错误
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