From d8e92f9d8de8d04bc0fd2c879d32f6171eb62c63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20R=C3=A4del?= <ducks.2788@gmail.com>
Date: Thu, 18 Aug 2016 21:36:05 +0200
Subject: [PATCH] Sample Hystrix implementation

---
 spring-cloud-hystrix/pom.xml                  | 49 +++++++++++++++
 .../pom.xml                                   | 62 +++++++++++++++++++
 .../rest/consumer/GreetingService.java        | 18 ++++++
 .../consumer/RestConsumerApplication.java     | 28 +++++++++
 .../resources/templates/greeting-view.html    |  9 +++
 .../pom.xml                                   | 40 ++++++++++++
 .../rest/producer/GreetingController.java     | 10 +++
 .../producer/RestProducerApplication.java     | 20 ++++++
 .../src/main/resources/application.properties |  1 +
 9 files changed, 237 insertions(+)
 create mode 100644 spring-cloud-hystrix/pom.xml
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/pom.xml
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/GreetingService.java
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/RestConsumerApplication.java
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/resources/templates/greeting-view.html
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/pom.xml
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/GreetingController.java
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/RestProducerApplication.java
 create mode 100644 spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/resources/application.properties

diff --git a/spring-cloud-hystrix/pom.xml b/spring-cloud-hystrix/pom.xml
new file mode 100644
index 0000000000..f7394d729e
--- /dev/null
+++ b/spring-cloud-hystrix/pom.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         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.baeldung.spring.cloud</groupId>
+    <artifactId>spring-cloud-hystrix</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <modules>
+        <module>spring-cloud-hystrix-rest-producer</module>
+        <module>spring-cloud-hystrix-rest-consumer</module>
+    </modules>
+    <packaging>pom</packaging>
+
+    <name>Spring Cloud Hystrix</name>
+    <description>Spring Cloud Hystrix Demo</description>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.5.1</version>
+                    <configuration>
+                        <source>1.8</source>
+                        <target>1.8</target>
+                    </configuration>
+                </plugin>
+                <plugin>
+                    <groupId>org.springframework.boot</groupId>
+                    <artifactId>spring-boot-maven-plugin</artifactId>
+                    <version>1.4.0.RELEASE</version>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+</project>
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/pom.xml b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/pom.xml
new file mode 100644
index 0000000000..b9da24b9a5
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/pom.xml
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         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>spring-cloud-hystrix-rest-consumer</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>Spring Cloud Hystrix REST Consumer</name>
+    <description>Spring Cloud Hystrix Sample Implementation</description>
+
+    <parent>
+        <groupId>com.baeldung.spring.cloud</groupId>
+        <artifactId>spring-cloud-hystrix</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-hystrix</artifactId>
+            <version>1.1.5.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>1.4.0.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-thymeleaf</artifactId>
+            <version>1.4.0.RELEASE</version>
+        </dependency>
+    </dependencies>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.cloud</groupId>
+                <artifactId>spring-cloud-starter-parent</artifactId>
+                <version>Brixton.SR4</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/GreetingService.java b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/GreetingService.java
new file mode 100644
index 0000000000..d3d5e6e047
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/GreetingService.java
@@ -0,0 +1,18 @@
+package com.baeldung.spring.cloud.hystrix.rest.consumer;
+
+import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class GreetingService {
+    @HystrixCommand(fallbackMethod = "defaultGreeting")
+    public String getGreeting(String username) {
+        return new RestTemplate().getForObject("http://localhost:9090/greeting/{username}", String.class, username);
+    }
+
+    private String defaultGreeting(String username) {
+        return "Hello User!";
+    }
+}
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/RestConsumerApplication.java b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/RestConsumerApplication.java
new file mode 100644
index 0000000000..051fd9a9bb
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/consumer/RestConsumerApplication.java
@@ -0,0 +1,28 @@
+package com.baeldung.spring.cloud.hystrix.rest.consumer;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@SpringBootApplication
+@EnableCircuitBreaker
+@Controller
+public class RestConsumerApplication {
+    @Autowired
+    private GreetingService greetingService;
+
+    public static void main(String[] args) {
+        SpringApplication.run(RestConsumerApplication.class, args);
+    }
+
+    @RequestMapping("/get-greeting/{username}")
+    public String getGreeting(Model model, @PathVariable("username") String username) {
+        model.addAttribute("greeting", greetingService.getGreeting(username));
+        return "greeting-view";
+    }
+}
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/resources/templates/greeting-view.html b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/resources/templates/greeting-view.html
new file mode 100644
index 0000000000..6cb70edf2d
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-consumer/src/main/resources/templates/greeting-view.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<html xmlns:th="http://www.thymeleaf.org">
+    <head>
+        <title>Greetings from Hystrix</title>
+    </head>
+    <body>
+        <h2 th:text="${greeting}"/>
+    </body>
+</html>
\ No newline at end of file
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/pom.xml b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/pom.xml
new file mode 100644
index 0000000000..44e373c8ac
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/pom.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
+         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>spring-cloud-hystrix-rest-producer</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>Spring Cloud Hystrix REST Producer</name>
+    <description>Spring Cloud Hystrix Sample REST Producer Implementation</description>
+
+    <parent>
+        <groupId>com.baeldung.spring.cloud</groupId>
+        <artifactId>spring-cloud-hystrix</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>..</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+            <version>1.4.0.RELEASE</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/GreetingController.java b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/GreetingController.java
new file mode 100644
index 0000000000..81541b4f8f
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/GreetingController.java
@@ -0,0 +1,10 @@
+package com.baeldung.spring.cloud.hystrix.rest.producer;
+
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+public interface GreetingController {
+    @RequestMapping("/greeting/{username}")
+    String greeting(@PathVariable("username") String username);
+}
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/RestProducerApplication.java b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/RestProducerApplication.java
new file mode 100644
index 0000000000..9496d4760d
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/java/com/baeldung/spring/cloud/hystrix/rest/producer/RestProducerApplication.java
@@ -0,0 +1,20 @@
+package com.baeldung.spring.cloud.hystrix.rest.producer;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+@RestController
+public class RestProducerApplication implements GreetingController {
+    public static void main(String[] args) {
+        SpringApplication.run(RestProducerApplication.class, args);
+    }
+
+    @Override
+    public String greeting(@PathVariable("username") String username) {
+        return String.format("Hello %s!\n", username);
+    }
+}
diff --git a/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/resources/application.properties b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/resources/application.properties
new file mode 100644
index 0000000000..5ff028510d
--- /dev/null
+++ b/spring-cloud-hystrix/spring-cloud-hystrix-rest-producer/src/main/resources/application.properties
@@ -0,0 +1 @@
+server.port=9090
\ No newline at end of file