Add Hystrix Dashboard (#115)

* Add circuit breaker to the getVisitsForPets method

* Use Collections.emptyMap()

* Fallback method with private visibility

* Unit test Hystrix fallback method

* #17 Add a Hystrix Dashboard application

* Fix hystrix-dashboard container name

README.md

@@ -14,6 +14,10 @@ If everything goes well, you can access the following services at given location
 * Customers, Vets and Visits Services - random port, check Eureka Dashboard 
 * Tracing Server (Zipkin) - http://localhost:9411/zipkin/ (we use [openzipkin](https://github.com/openzipkin/zipkin/tree/master/zipkin-server))
 * Admin Server (Spring Boot Admin) - http://localhost:9090
+* Hystrix Dashboard for Circuit Breaker pattern - http://localhost:7979 - On the home page is a form where you can enter 
+the URL for an event stream to monitor, for example the `api-gateway` service running locally: `http://localhost:8080/actuator/hystrix.stream` 
+or running into docker: `http://api-gateway:8080/actuator/hystrix.stream`
+
 
 You can tell Config Server to use your local Git repository by using `local` Spring profile and setting
 `GIT_REPO` environment variable, for example:

docker-compose.yml

@@ -80,3 +80,14 @@ services:
     entrypoint: ["./dockerize","-wait=tcp://discovery-server:8761","-timeout=60s","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
     ports:
      - 9090:9090
+
+  hystrix-dashboard:
+    image: mszarlinski/spring-petclinic-hystrix-dashboard
+    container_name: hystrix-dashboard
+    mem_limit: 512M
+    depends_on:
+     - config-server
+     - discovery-server
+    entrypoint: ["./dockerize","-wait=tcp://discovery-server:8761","-timeout=60s","--","java", "-XX:+UnlockExperimentalVMOptions", "-XX:+UseCGroupMemoryLimitForHeap", "-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]
+    ports:
+     - 7979:7979

pom.xml

@@ -23,6 +23,7 @@
         <module>spring-petclinic-config-server</module>
         <module>spring-petclinic-discovery-server</module>
         <module>spring-petclinic-api-gateway</module>
+        <module>spring-petclinic-hystrix-dashboard</module>
     </modules>
 
     <properties>

spring-petclinic-hystrix-dashboard/pom.xml

+<?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>spring-petclinic-microservices</artifactId>
+        <groupId>org.springframework.samples</groupId>
+        <version>2.0.5</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>spring-petclinic-hystrix-dashboard</artifactId>
+    <description>Circuit breaker dashboard with with Spring Cloud Netflix Hystrix</description>
+
+    <properties>
+        <docker.image.exposed.port>7979</docker.image.exposed.port>
+        <docker.image.dockerfile.dir>${basedir}/../docker</docker.image.dockerfile.dir>
+    </properties>
+
+    <dependencies>
+
+        <!-- Spring Boot -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- Spring Cloud -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-config</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
+        </dependency>
+
+        <!-- Testing -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <profiles>
+        <profile>
+            <id>buildDocker</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>com.spotify</groupId>
+                        <artifactId>docker-maven-plugin</artifactId>
+                        <version>${docker.plugin.version}</version>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+</project>

spring-petclinic-hystrix-dashboard/src/main/java/org/springframework/samples/petclinic/dashboard/HystrixDashboardApplication.java

+package org.springframework.samples.petclinic.dashboard;
+
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
+import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@SpringBootApplication
+@EnableDiscoveryClient
+@EnableHystrixDashboard
+@Controller
+public class HystrixDashboardApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(HystrixDashboardApplication.class, args);
+    }
+
+    @RequestMapping("/")
+    public String home() {
+        return "forward:/hystrix";
+    }
+}

spring-petclinic-hystrix-dashboard/src/main/resources/bootstrap.yml

+spring:
+  cloud:
+    config:
+      uri: http://localhost:8888
+  application:
+    name: hystrix-dashboard
+---
+spring:
+  profiles: docker
+  cloud:
+    config:
+      uri: http://config-server:8888

spring-petclinic-hystrix-dashboard/src/main/resources/logback-spring.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <include resource="org/springframework/boot/logging/logback/base.xml"/>
+    <!-- Required for Loglevel managment into the Spring Petclinic Admin Server-->
+    <jmxConfigurator/>
+</configuration>

spring-petclinic-hystrix-dashboard/src/test/java/org/springframework/samples/petclinic/dashboard/HystrixDashboardApplicationTests.java

+package org.springframework.samples.petclinic.dashboard;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+@ExtendWith(SpringExtension.class)
+@SpringBootTest
+class HystrixDashboardApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}