#BAEL-1025 (#2445)

Author: Tian Baoqiang

ratpack/pom.xml

@@ -40,16 +40,38 @@
             <artifactId>ratpack-hikari</artifactId>
             <version>${ratpack.version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.ratpack</groupId>
+            <artifactId>ratpack-hystrix</artifactId>
+            <version>${ratpack.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.ratpack</groupId>
+            <artifactId>ratpack-rx</artifactId>
+            <version>${ratpack.version}</version>
+        </dependency>
         <dependency>
             <groupId>io.ratpack</groupId>
             <artifactId>ratpack-test</artifactId>
             <version>${ratpack.version}</version>
+            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
             <version>1.4.193</version>
         </dependency>
+
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpclient</artifactId>
+            <version>4.5.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpcore</artifactId>
+            <version>4.4.6</version>
+        </dependency>
     </dependencies>
 
     <build>

ratpack/src/main/java/com/baeldung/hystrix/HystrixAsyncHttpCommand.java

@@ -0,0 +1,54 @@
+package com.baeldung.hystrix;
+
+import com.netflix.hystrix.HystrixCommand;
+import com.netflix.hystrix.HystrixCommandGroupKey;
+import com.netflix.hystrix.HystrixCommandProperties;
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.message.BasicHeader;
+import org.apache.http.util.EntityUtils;
+
+import java.net.URI;
+import java.util.Collections;
+
+/**
+ * @author aiet
+ */
+public class HystrixAsyncHttpCommand extends HystrixCommand<String> {
+
+    private URI uri;
+    private RequestConfig requestConfig;
+
+    HystrixAsyncHttpCommand(URI uri, int timeoutMillis) {
+        super(Setter
+          .withGroupKey(HystrixCommandGroupKey.Factory.asKey("hystrix-ratpack-async"))
+          .andCommandPropertiesDefaults(HystrixCommandProperties
+            .Setter()
+            .withExecutionTimeoutInMilliseconds(timeoutMillis)));
+        requestConfig = RequestConfig
+          .custom()
+          .setSocketTimeout(timeoutMillis)
+          .setConnectTimeout(timeoutMillis)
+          .setConnectionRequestTimeout(timeoutMillis)
+          .build();
+        this.uri = uri;
+    }
+
+    @Override
+    protected String run() throws Exception {
+        return EntityUtils.toString(HttpClientBuilder
+          .create()
+          .setDefaultRequestConfig(requestConfig)
+          .setDefaultHeaders(Collections.singleton(new BasicHeader("User-Agent", "Baeldung Blocking HttpClient")))
+          .build()
+          .execute(new HttpGet(uri))
+          .getEntity());
+    }
+
+    @Override
+    protected String getFallback() {
+        return "eugenp's async fallback profile";
+    }
+
+}

ratpack/src/main/java/com/baeldung/hystrix/HystrixReactiveHttpCommand.java

@@ -0,0 +1,44 @@
+package com.baeldung.hystrix;
+
+import com.netflix.hystrix.HystrixCommandGroupKey;
+import com.netflix.hystrix.HystrixCommandProperties;
+import com.netflix.hystrix.HystrixObservableCommand;
+import ratpack.http.client.HttpClient;
+import ratpack.rx.RxRatpack;
+import rx.Observable;
+
+import java.net.URI;
+
+/**
+ * @author aiet
+ */
+public class HystrixReactiveHttpCommand extends HystrixObservableCommand<String> {
+
+    private HttpClient httpClient;
+    private URI uri;
+
+    HystrixReactiveHttpCommand(HttpClient httpClient, URI uri, int timeoutMillis) {
+        super(Setter
+          .withGroupKey(HystrixCommandGroupKey.Factory.asKey("hystrix-ratpack-reactive"))
+          .andCommandPropertiesDefaults(HystrixCommandProperties
+            .Setter()
+            .withExecutionTimeoutInMilliseconds(timeoutMillis)));
+        this.httpClient = httpClient;
+        this.uri = uri;
+    }
+
+    @Override
+    protected Observable<String> construct() {
+        return RxRatpack.observe(httpClient
+          .get(uri, requestSpec -> requestSpec.headers(mutableHeaders -> mutableHeaders.add("User-Agent", "Baeldung HttpClient")))
+          .map(receivedResponse -> receivedResponse
+            .getBody()
+            .getText()));
+    }
+
+    @Override
+    protected Observable<String> resumeWithFallback() {
+        return Observable.just("eugenp's reactive fallback profile");
+    }
+
+}

ratpack/src/main/java/com/baeldung/hystrix/HystrixSyncHttpCommand.java

@@ -0,0 +1,55 @@
+package com.baeldung.hystrix;
+
+import com.netflix.hystrix.HystrixCommand;
+import com.netflix.hystrix.HystrixCommandGroupKey;
+import com.netflix.hystrix.HystrixCommandProperties;
+import org.apache.http.client.config.RequestConfig;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.message.BasicHeader;
+import org.apache.http.util.EntityUtils;
+
+import java.net.URI;
+import java.util.Collections;
+
+/**
+ * @author aiet
+ */
+public class HystrixSyncHttpCommand extends HystrixCommand<String> {
+
+    private URI uri;
+    private RequestConfig requestConfig;
+
+    HystrixSyncHttpCommand(URI uri, int timeoutMillis) {
+        super(Setter
+          .withGroupKey(HystrixCommandGroupKey.Factory.asKey("hystrix-ratpack-sync"))
+          .andCommandPropertiesDefaults(HystrixCommandProperties
+            .Setter()
+            .withExecutionTimeoutInMilliseconds(timeoutMillis)));
+        requestConfig = RequestConfig
+          .custom()
+          .setSocketTimeout(timeoutMillis)
+          .setConnectTimeout(timeoutMillis)
+          .setConnectionRequestTimeout(timeoutMillis)
+          .build();
+        this.uri = uri;
+    }
+
+    @Override
+    protected String run() throws Exception {
+        HttpGet request = new HttpGet(uri);
+        return EntityUtils.toString(HttpClientBuilder
+          .create()
+          .setDefaultRequestConfig(requestConfig)
+          .setDefaultHeaders(Collections.singleton(new BasicHeader("User-Agent", "Baeldung Blocking HttpClient")))
+          .build()
+          .execute(request)
+          .getEntity());
+    }
+
+    @Override
+    protected String getFallback() {
+        return "eugenp's sync fallback profile";
+    }
+
+}

ratpack/src/main/java/com/baeldung/hystrix/RatpackHystrixApp.java

@@ -0,0 +1,30 @@
+package com.baeldung.hystrix;
+
+import ratpack.guice.Guice;
+import ratpack.http.client.HttpClient;
+import ratpack.hystrix.HystrixMetricsEventStreamHandler;
+import ratpack.hystrix.HystrixModule;
+import ratpack.server.RatpackServer;
+
+import java.net.URI;
+
+public class RatpackHystrixApp {
+
+    public static void main(String[] args) throws Exception {
+        final int timeout = Integer.valueOf(System.getProperty("ratpack.hystrix.timeout"));
+        final URI eugenGithubProfileUri = new URI("https://api.github.com/users/eugenp");
+
+        RatpackServer.start(server -> server
+          .registry(Guice.registry(bindingsSpec -> bindingsSpec.module(new HystrixModule().sse())))
+          .handlers(chain -> chain
+            .get("rx", ctx -> new HystrixReactiveHttpCommand(ctx.get(HttpClient.class), eugenGithubProfileUri, timeout)
+              .toObservable()
+              .subscribe(ctx::render))
+            .get("async", ctx -> ctx.render(new HystrixAsyncHttpCommand(eugenGithubProfileUri, timeout)
+              .queue()
+              .get()))
+            .get("sync", ctx -> ctx.render(new HystrixSyncHttpCommand(eugenGithubProfileUri, timeout).execute()))
+            .get("hystrix", new HystrixMetricsEventStreamHandler())));
+
+    }
+}

ratpack/src/test/java/com/baeldung/hystrix/RatpackHystrixAppFallbackLiveTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.hystrix;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import ratpack.test.MainClassApplicationUnderTest;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.junit.Assert.assertThat;
+
+/**
+ * @author aiet
+ */
+public class RatpackHystrixAppFallbackLiveTest {
+
+    static MainClassApplicationUnderTest appUnderTest;
+
+    @BeforeClass
+    public static void setup() {
+        System.setProperty("ratpack.hystrix.timeout", "10");
+        appUnderTest = new MainClassApplicationUnderTest(RatpackHystrixApp.class);
+    }
+
+    @Test
+    public void whenFetchReactive_thenGotFallbackProfile() {
+        assertThat(appUnderTest
+          .getHttpClient()
+          .getText("rx"), containsString("reactive fallback profile"));
+    }
+
+    @Test
+    public void whenFetchAsync_thenGotFallbackProfile() {
+        assertThat(appUnderTest
+          .getHttpClient()
+          .getText("async"), containsString("async fallback profile"));
+    }
+
+    @Test
+    public void whenFetchSync_thenGotFallbackProfile() {
+        assertThat(appUnderTest
+          .getHttpClient()
+          .getText("sync"), containsString("sync fallback profile"));
+    }
+
+    @AfterClass
+    public static void clean() {
+        appUnderTest.close();
+    }
+
+}

ratpack/src/test/java/com/baeldung/hystrix/RatpackHystrixAppLiveTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.hystrix;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import ratpack.test.MainClassApplicationUnderTest;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.junit.Assert.assertThat;
+
+/**
+ * @author aiet
+ */
+public class RatpackHystrixAppLiveTest {
+
+    static MainClassApplicationUnderTest appUnderTest;
+
+    @BeforeClass
+    public static void setup() {
+        System.setProperty("ratpack.hystrix.timeout", "5000");
+        appUnderTest = new MainClassApplicationUnderTest(RatpackHystrixApp.class);
+    }
+
+    @Test
+    public void whenFetchReactive_thenGotEugenProfile() {
+        assertThat(appUnderTest
+          .getHttpClient()
+          .getText("rx"), containsString("www.baeldung.com"));
+    }
+
+    @Test
+    public void whenFetchAsync_thenGotEugenProfile() {
+        assertThat(appUnderTest
+          .getHttpClient()
+          .getText("async"), containsString("www.baeldung.com"));
+    }
+
+    @Test
+    public void whenFetchSync_thenGotEugenProfile() {
+        assertThat(appUnderTest
+          .getHttpClient()
+          .getText("sync"), containsString("www.baeldung.com"));
+    }
+
+    @AfterClass
+    public static void clean() {
+        appUnderTest.close();
+    }
+
+}