auto-config for zipkin support for spring mvc and restTemplate

spring-cloud-sleuth-sample/src/main/java/org/springframework/cloud/sleuth/sample/SampleApplication.java

@@ -1,14 +1,19 @@
 package org.springframework.cloud.sleuth.sample;
 
+import java.util.Random;
+
+import lombok.SneakyThrows;
 import lombok.extern.slf4j.Slf4j;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.context.embedded.EmbeddedServletContainerInitializedEvent;
+import org.springframework.context.ApplicationListener;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.core.env.Environment;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.client.RestTemplate;
 
 /**
  * @author Spencer Gibb
@@ -17,19 +22,43 @@ import org.springframework.web.bind.annotation.RestController;
 @EnableAutoConfiguration
 @RestController
 @Slf4j
-public class SampleApplication {
+public class SampleApplication implements ApplicationListener<EmbeddedServletContainerInitializedEvent> {
 
 	public static final String CLIENT_NAME = "testApp";
 
-	@Autowired
-	Environment env;
+    @Autowired
+    private RestTemplate restTemplate;
+    private int port;
 
-	@RequestMapping("/")
+    @SneakyThrows
+    @RequestMapping("/")
 	public String hi() {
-		return "hi";
+        final Random random = new Random();
+        Thread.sleep(random.nextInt(1000));
+
+        String s = restTemplate.getForObject("http://localhost:" + port + "/hi2", String.class);
+        return "hi/"+s;
 	}
 
+    @SneakyThrows
+    @RequestMapping("/hi2")
+    public String hi2() {
+        final Random random = new Random();
+        Thread.sleep(random.nextInt(1000));
+        return "hi2";
+    }
+
 	public static void main(String[] args) {
 		SpringApplication.run(SampleApplication.class, args);
 	}
+
+    /*@Bean
+    public SpanCollector spanCollector() {
+        return new LoggingSpanCollectorImpl();
+    }*/
+
+    @Override
+    public void onApplicationEvent(EmbeddedServletContainerInitializedEvent event) {
+        port = event.getEmbeddedServletContainer().getPort();
+    }
 }

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

@@ -1,5 +1,5 @@
 server:
-  port: 8080
+  port: 3380
 
 spring:
   application: