Add ribbon/zuul features and docs plus a sample

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-ribbon/src/main/java/sample/SampleController.java

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+/*
+ * Copyright 2013-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample;
+
+import java.util.Random;
+
+import lombok.SneakyThrows;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * @author Spencer Gibb
+ * @author Dave Syer
+ */
+@RestController
+public class SampleController  {
+
+	@Autowired
+	private RestTemplate restTemplate;
+
+	@SneakyThrows
+	@RequestMapping("/")
+	public String hi() {
+		final Random random = new Random();
+		Thread.sleep(random.nextInt(1000));
+		String s = this.restTemplate.getForObject("http://zipkin/hi2", String.class);
+		return "hi/" + s;
+	}
+
+	@SneakyThrows
+	@RequestMapping("/call")
+	public String traced() {
+		String s = this.restTemplate.getForObject("http://zipkin/call", String.class);
+		return "call/" + s;
+	}
+
+}

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-ribbon/src/main/java/sample/SampleRibbonApplication.java

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+/*
+ * Copyright 2013-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
+import org.springframework.cloud.sleuth.Sampler;
+import org.springframework.cloud.sleuth.sampler.AlwaysSampler;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.EnableAspectJAutoProxy;
+import org.springframework.scheduling.annotation.EnableAsync;
+
+import com.github.kristofa.brave.LoggingSpanCollectorImpl;
+import com.github.kristofa.brave.SpanCollector;
+
+/**
+ * @author Spencer Gibb
+ */
+@SpringBootApplication
+@EnableAspectJAutoProxy(proxyTargetClass = true)
+@EnableAsync
+@EnableZuulProxy
+public class SampleRibbonApplication {
+
+	@Bean
+	public Sampler<?> defaultSampler() {
+		return new AlwaysSampler();
+	}
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleRibbonApplication.class, args);
+	}
+
+	// Use this for debugging (or if there is no Zipkin collector running on port 9410)
+	@Bean
+	@ConditionalOnProperty(value="sample.zipkin.enabled", havingValue="false")
+	public SpanCollector spanCollector() {
+		return new LoggingSpanCollectorImpl();
+	}
+
+}

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-ribbon/src/main/resources/application.yml

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+server:
+  port: 3382
+
+spring:
+  application:
+    name: testSleuthRibbon
+  sleuth:
+    log:
+      json:
+        enabled: true
+
+zipkin:
+  ribbon:
+    listOfServers: localhost:3380
+messaging:
+  ribbon:
+    listOfServers: localhost:3381
+vanilla:
+  ribbon:
+    listOfServers: localhost:3379
+
+hystrix:
+  execution:
+    isolation:
+      strategy: SEMAPHORE
+
+zuul:
+  routes:
+    zipkin:
+      url: http://localhost:3380
+    messaging:
+      url: http://localhost:3381
+    vanilla:
+      url: http://localhost:3379
+
+logging:
+  pattern:
+    console: '%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(%5p) %clr(${PID:- }){magenta} %clr(---){faint} %clr([trace=%X{X-Trace-Id:-},span=%X{X-Span-Id:-}]){yellow} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n%wex'
+
+endpoints:
+  health:
+    sensitive: false
+  restart:
+    enabled: true
+  shutdown:
+    enabled: true