<?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>    <groupId>com.liumiaocn.demo.springcloud</groupId>    <artifactId>dashboardservice</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>jar</packaging>    <name>dashboardservice</name>    <description>Demo project for Spring Boot</description>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.4.3.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </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.cloud</groupId>            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-turbine</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-test</artifactId>            <scope>test</scope>        </dependency>    </dependencies>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.cloud</groupId>                <artifactId>spring-cloud-dependencies</artifactId>                <version>Camden.BUILD-SNAPSHOT</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>    <repositories>        <repository>            <id>spring-snapshots</id>            <name>Spring Snapshots</name>            <url>https://repo.spring.io/snapshot</url>            <snapshots>                <enabled>true</enabled>            </snapshots>        </repository>        <repository>            <id>spring-milestones</id>            <name>Spring Milestones</name>            <url>https://repo.spring.io/milestone</url>            <snapshots>                <enabled>false</enabled>            </snapshots>        </repository>    </repositories></project>

package com.liumiaocn.demo.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;import org.springframework.cloud.netflix.turbine.EnableTurbine;import org.springframework.web.bind.annotation.RequestMapping;@[email protected]@[email protected] class DashboardserviceApplication {    @RequestMapping("/")    public String home() {        return "forward:/hystrix";    }    public static void main(String[] args) {        SpringApplication.run(DashboardserviceApplication.class, args);    }}

server.port=8101spring.application.name=dashboardserviceeureka.client.serviceUrl.defaultZone=http://localhost:8801/eureka/

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Spring Cloud是Spring总多的Project中的一个,它提供了一整套的工具帮助系统架构师们在进行分布式设计的时候可以拿来即用, 在创建和发布微服务时极为便捷和有效。
  本系列文章将会使用最简单的例子和最为容易的方式来学习Spring Cloud。本文将会介绍如何引入Netflix Hystrix在微服务的架构中如何实现断路器。

构成

断路器

＞断路器本身是电路上的一种过载保护装置，当线路中有电器发生短路时，它能够及时的切断故障电路以防止严重后果发生。

而在系统架构之中同样的熔断机制也是需要的。

MatinFowler作过详细阐述，有兴趣的可以查看下面这篇文章。

Pom详细

<?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>    <groupId>com.liumiaocn.demo.springcloud</groupId>    <artifactId>dashboardservice</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>jar</packaging>    <name>dashboardservice</name>    <description>Demo project for Spring Boot</description>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.4.3.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </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.cloud</groupId>            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.cloud</groupId>            <artifactId>spring-cloud-starter-turbine</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-test</artifactId>            <scope>test</scope>        </dependency>    </dependencies>    <dependencyManagement>        <dependencies>            <dependency>                <groupId>org.springframework.cloud</groupId>                <artifactId>spring-cloud-dependencies</artifactId>                <version>Camden.BUILD-SNAPSHOT</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>    <repositories>        <repository>            <id>spring-snapshots</id>            <name>Spring Snapshots</name>            <url>https://repo.spring.io/snapshot</url>            <snapshots>                <enabled>true</enabled>            </snapshots>        </repository>        <repository>            <id>spring-milestones</id>            <name>Spring Milestones</name>            <url>https://repo.spring.io/milestone</url>            <snapshots>                <enabled>false</enabled>            </snapshots>        </repository>    </repositories></project>

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dashboardservice

 

需要加入EnableTurbine和EnableHystrixDashboard注解。

package com.liumiaocn.demo.springcloud;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;import org.springframework.cloud.netflix.turbine.EnableTurbine;import org.springframework.web.bind.annotation.RequestMapping;@[email protected]@[email protected] class DashboardserviceApplication {    @RequestMapping("/")    public String home() {        return "forward:/hystrix";    }    public static void main(String[] args) {        SpringApplication.run(DashboardserviceApplication.class, args);    }}

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设定文件

server.port=8101spring.application.name=dashboardserviceeureka.client.serviceUrl.defaultZone=http://localhost:8801/eureka/

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生成Package

访问方式

启动

＞启动各个服务后，也启动dashboardservice

Eureka确认

Hystrix Dashboard

总结

＞本文简单说明了断路器的原理以及如何在项目中导入Turbine和Hystrix Dashboard。至于实现熔断的具体实例最好还是结合多节点多服务的更加接近实际环境的例子理解起来才更加容易，我们会在后续与容器以及PAAS管理平台K8S等的结合中继续展开。