增加 Hystrix 入门示例（Hystrix Turbine）

labx-23/labx-23-scn-hystrix-dashboard-turbine/pom.xml

@@ -0,0 +1,74 @@
+<?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">
+    <parent>
+        <artifactId>labx-23</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>labx-23-scn-hystrix-dashboard-turbine</artifactId>
+
+    <properties>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
+        <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
+    </properties>
+
+    <!--
+        引入 Spring Boot、Spring Cloud、Spring Cloud Alibaba 三者 BOM 文件，进行依赖版本的管理，防止不兼容。
+        在 https://dwz.cn/mcLIfNKt 文章中，Spring Cloud Alibaba 开发团队推荐了三者的依赖关系
+     -->
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>${spring.boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-dependencies</artifactId>
+                <version>${spring.cloud.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <!-- 引入 SpringMVC 相关依赖，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- 引入 Spring Cloud Netflix Hystrix 相关依赖，将 Hystrix 作为服务保障组件，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-turbine</artifactId>
+        </dependency>
+
+        <!-- 引入 Spring Cloud Netflix Eureka Client 相关依赖，将 Eureka 作为注册中心的客户端，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

labx-23/labx-23-scn-hystrix-dashboard-turbine/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/HystrixDashboardApplication.java

@@ -0,0 +1,17 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
+import org.springframework.cloud.netflix.turbine.EnableTurbine;
+
+@SpringBootApplication
+@EnableHystrixDashboard
+@EnableTurbine
+public class HystrixDashboardApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HystrixDashboardApplication.class, args);
+    }
+
+}

labx-23/labx-23-scn-hystrix-dashboard-turbine/src/main/resources/application.yml

@@ -0,0 +1,16 @@
+server:
+  port: 9090
+
+spring:
+  application:
+    name: hystrix-dashboard
+
+eureka:
+  client:
+    service-url:
+      defaultZone: http://127.0.0.1:8761/eureka/ # Eureka-Server 地址
+
+turbine:
+  app-config: hystrix-demo
+  combine-host-port: true
+  cluster-name-expression: new String('default')

labx-23/labx-23-scn-hystrix-demo01-cluster/pom.xml

@@ -0,0 +1,70 @@
+<?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">
+    <parent>
+        <artifactId>labx-23</artifactId>
+        <groupId>cn.iocoder.springboot.labs</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>labx-23-scn-hystrix-demo01-cluster</artifactId>
+
+    <properties>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <spring.boot.version>2.2.4.RELEASE</spring.boot.version>
+        <spring.cloud.version>Hoxton.SR1</spring.cloud.version>
+    </properties>
+
+    <!--
+        引入 Spring Boot、Spring Cloud、Spring Cloud Alibaba 三者 BOM 文件，进行依赖版本的管理，防止不兼容。
+        在 https://dwz.cn/mcLIfNKt 文章中，Spring Cloud Alibaba 开发团队推荐了三者的依赖关系
+     -->
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-starter-parent</artifactId>
+                <version>${spring.boot.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-dependencies</artifactId>
+                <version>${spring.cloud.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <!-- 引入 SpringMVC 相关依赖，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- 引入 Spring Cloud Netflix Hystrix 相关依赖，将 Hystrix 作为服务保障组件，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
+        </dependency>
+
+        <!-- 实现对 Actuator 的自动化配置 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+
+        <!-- 引入 Spring Cloud Netflix Eureka Client 相关依赖，将 Eureka 作为注册中心的客户端，并实现对其的自动配置 -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/DemoApplication.java

@@ -0,0 +1,22 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
+import org.springframework.context.annotation.Bean;
+import org.springframework.web.client.RestTemplate;
+
+@SpringBootApplication
+@EnableCircuitBreaker // 声明开启断路器
+public class DemoApplication {
+
+    @Bean
+    public RestTemplate restTemplate() {
+        return new RestTemplate();
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(DemoApplication.class, args);
+    }
+
+}

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/controller/CacheDemoController.java

@@ -0,0 +1,33 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo.controller;
+
+import cn.iocoder.springcloud.labx23.hystrixdemo.service.CacheDemoService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/cache-demo")
+public class CacheDemoController {
+
+    @Autowired
+    private CacheDemoService cacheDemoService;
+
+    @GetMapping("/get_user")
+    public String getUser(@RequestParam("id") Integer id) {
+        String userA = cacheDemoService.getUser(id);
+        String userB = cacheDemoService.getUser(id);
+        String userC = cacheDemoService.getUser(id);
+        return userC;
+    }
+
+    @GetMapping("/update_user")
+    public String updateUser(@RequestParam("id") Integer id) {
+        String userA = cacheDemoService.getUser(id);
+        cacheDemoService.updateUser(id);
+        String userC = cacheDemoService.getUser(id);
+        return userC;
+    }
+
+}

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/controller/CollapserDemoController.java

@@ -0,0 +1,46 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo.controller;
+
+import cn.iocoder.springcloud.labx23.hystrixdemo.service.CollapserDemoService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+
+@RestController
+@RequestMapping("/collapser-demo")
+public class CollapserDemoController {
+
+    private Logger logger = LoggerFactory.getLogger(CollapserDemoController.class);
+
+    @Autowired
+    private CollapserDemoService collapserDemoService;
+
+    @GetMapping("/test")
+    public void test() throws ExecutionException, InterruptedException {
+        logger.info("[test][准备获取用户信息]");
+        Future<String> user01 = collapserDemoService.getUserFuture(1);
+        Future<String> user02 = collapserDemoService.getUserFuture(2);
+        logger.info("[test][提交获取用户信息]");
+
+        logger.info("[test][user({}) 的结果为({})]", 1, user01.get());
+        logger.info("[test][user({}) 的结果为({})]", 2, user02.get());
+    }
+
+
+    @GetMapping("/test_02")
+    public void test02() throws ExecutionException, InterruptedException {
+        logger.info("[test][准备获取用户信息]");
+        Future<String> user01 = collapserDemoService.getUserFuture(2);
+        Future<String> user02 = collapserDemoService.getUserFuture(1);
+        logger.info("[test][提交获取用户信息]");
+
+        logger.info("[test][user({}) 的结果为({})]", 1, user01.get());
+        logger.info("[test][user({}) 的结果为({})]", 2, user02.get());
+    }
+
+}

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/controller/DemoController.java

@@ -0,0 +1,35 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo.controller;
+
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import org.apache.commons.lang.exception.ExceptionUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+@RestController
+@RequestMapping("/demo")
+public class DemoController {
+
+    private Logger logger = LoggerFactory.getLogger(getClass());
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    @GetMapping("/get_user")
+    @HystrixCommand(fallbackMethod = "getUserFallback")
+    public String getUser(@RequestParam("id") Integer id) {
+        logger.info("[getUser][准备调用 user-service 获取用户({})详情]", id);
+        return restTemplate.getForEntity("http://127.0.0.1:18080/user/get?id=" + id, String.class).getBody();
+    }
+
+    public String getUserFallback(Integer id, Throwable throwable) {
+        logger.info("[getUserFallback][id({}) exception({})]", id, ExceptionUtils.getRootCauseMessage(throwable));
+        return "mock:User:" + id;
+    }
+
+}

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/filter/HystrixRequestContextFilter.java

@@ -0,0 +1,28 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo.filter;
+
+import com.netflix.hystrix.strategy.concurrency.HystrixRequestContext;
+import org.springframework.stereotype.Component;
+
+import javax.servlet.*;
+import javax.servlet.annotation.WebFilter;
+import java.io.IOException;
+
+@Component
+@WebFilter(urlPatterns = "/")
+public class HystrixRequestContextFilter implements Filter {
+
+    @Override
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+            throws IOException, ServletException {
+        // 初始化 HystrixRequestContext
+        HystrixRequestContext context = HystrixRequestContext.initializeContext();
+        // 继续过滤器
+        try {
+            chain.doFilter(request, response);
+        } finally {
+            // 销毁 HystrixRequestContext
+            context.close();
+        }
+    }
+
+}

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/service/CacheDemoService.java

@@ -0,0 +1,43 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo.service;
+
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import com.netflix.hystrix.contrib.javanica.cache.annotation.CacheRemove;
+import com.netflix.hystrix.contrib.javanica.cache.annotation.CacheResult;
+import org.apache.commons.lang.exception.ExceptionUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class CacheDemoService {
+
+    private Logger logger = LoggerFactory.getLogger(CacheDemoService.class);
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    @HystrixCommand(fallbackMethod = "getUserFallback")
+    @CacheResult(cacheKeyMethod = "genGetUserCacheKey")
+    public String getUser(Integer id) {
+        logger.info("[getUser][准备调用 user-service 获取用户({})详情]", id);
+        return restTemplate.getForEntity("http://127.0.0.1:18080/user/get?id=" + id, String.class).getBody();
+    }
+
+    @HystrixCommand
+    @CacheRemove(commandKey = "getUser", cacheKeyMethod = "genGetUserCacheKey")
+    public void updateUser(Integer id) {
+        logger.info("[updateUser][更新用户({})详情]", id);
+    }
+
+    public String getUserFallback(Integer id, Throwable throwable) {
+        logger.info("[getUserFallback][id({}) exception({})]", id, ExceptionUtils.getRootCauseMessage(throwable));
+        return "mock:User:" + id;
+    }
+
+    public String genGetUserCacheKey(Integer id) {
+        return "USER_" + id;
+    }
+
+}

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/java/cn/iocoder/springcloud/labx23/hystrixdemo/service/CollapserDemoService.java

@@ -0,0 +1,44 @@
+package cn.iocoder.springcloud.labx23.hystrixdemo.service;
+
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCollapser;
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
+import org.apache.commons.lang.StringUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.Future;
+
+@Service
+public class CollapserDemoService {
+
+    private Logger logger = LoggerFactory.getLogger(CollapserDemoService.class);
+
+    @Autowired
+    private RestTemplate restTemplate;
+
+    @HystrixCollapser(
+            batchMethod = "getUsers",
+            collapserProperties = {
+                    @HystrixProperty(name = "timerDelayInMilliseconds", value = "10000") // 演示，所以设置的时间较长
+            }
+    )
+    public Future<String> getUserFuture(Integer id) {
+        throw new RuntimeException("This method body should not be executed");
+    }
+
+    @HystrixCommand
+    public List<String> getUsers(List<Integer> ids) {
+        logger.info("[getUsers][准备调用 user-service 获取多个用户({})详情]", ids);
+        String[] users = restTemplate.getForEntity("http://127.0.0.1:18080/user/batch_get?ids=" + StringUtils.join(ids, ',')
+                , String[].class).getBody();
+        return users == null || users.length == 0 ? Collections.emptyList() : Arrays.asList(users);
+    }
+
+}

labx-23/labx-23-scn-hystrix-demo01-cluster/src/main/resources/application.yml

@@ -0,0 +1,14 @@
+management:
+  endpoints:
+    web:
+      exposure:
+        include: 'hystrix.stream' # 需要开放的端点。默认值只打开 health 和 info 两个端点。通过设置 * ，可以开放所有端点。
+
+spring:
+  application:
+    name: hystrix-demo # 应用名
+
+eureka:
+  client:
+    service-url:
+      defaultZone: http://127.0.0.1:8761/eureka/ # Eureka-Server 地址

labx-23/pom.xml

@@ -12,11 +12,15 @@
     <artifactId>labx-23</artifactId>
     <packaging>pom</packaging>
     <modules>
-        <module>labx-23-scn-hystrix-demo01</module>
         <module>labx-23-user-service</module>
 
+        <module>labx-23-scn-hystrix-demo01</module>
+
         <module>labx-23-scn-hystrix-actuator</module>
         <module>labx-23-scn-hystrix-dashboard</module>
+
+        <module>labx-23-scn-hystrix-demo01-cluster</module>
+        <module>labx-23-scn-hystrix-dashboard-turbine</module>
     </modules>
 
 </project>

pom.xml

@@ -90,9 +90,7 @@
 <!--        <module>labx-19</module>-->
 <!--        <module>labx-20</module>-->
 <!--        <module>labx-21</module>-->
-<!--        <module>labx-22</module>-->
-
-
+        <module>labx-22</module>
         <module>labx-23</module>
     </modules>