Add Feign sample that fails to close a span

See gh-240

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-feign/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 org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.cloud.netflix.feign.FeignClient;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * @author Spencer Gibb
+ * @author Dave Syer
+ */
+@RestController
+public class SampleController {
+
+	private Zipkin zipkin;
+
+	private Random random = new Random();
+
+	@Autowired
+	public SampleController(Zipkin zipkin) {
+		this.zipkin = zipkin;
+	}
+
+	@RequestMapping("/")
+	public String hi() throws InterruptedException {
+		Thread.sleep(this.random.nextInt(1000));
+		String s = this.zipkin.hi2();
+		return "hi/" + s;
+	}
+
+	@RequestMapping("/call")
+	public String traced() {
+		String s = this.zipkin.call();
+		return "call/" + s;
+	}
+
+}
+
+@FeignClient("zipkin")
+interface Zipkin {
+	@RequestMapping(value = "/call", method = RequestMethod.GET)
+	String call();
+
+	@RequestMapping(value = "/hi2", method = RequestMethod.GET)
+	String hi2();
+}

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-feign/src/main/java/sample/SampleFeignApplication.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.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.cloud.netflix.feign.EnableFeignClients;
+import org.springframework.cloud.sleuth.zipkin.ZipkinSpanReporter;
+import org.springframework.context.annotation.Bean;
+
+import zipkin.Span;
+
+/**
+ * @author Spencer Gibb
+ */
+@SpringBootApplication
+@EnableFeignClients
+public class SampleFeignApplication {
+
+	private static Log logger = LogFactory.getLog(SampleFeignApplication.class);
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleFeignApplication.class, args);
+	}
+
+	// Use this for debugging (or if there is no Zipkin server running on port 9411)
+	@Bean
+	@ConditionalOnProperty(value = "sample.zipkin.enabled", havingValue = "false")
+	public ZipkinSpanReporter spanCollector() {
+		return new ZipkinSpanReporter() {
+			@Override
+			public void report(Span span) {
+				logger.info(span);
+			}
+		};
+	}
+
+}

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

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+server:
+  port: 3383
+
+logging.level.com.netflix.discovery: 'OFF'
+
+sample:
+  zipkin:
+    enabled: false
+
+spring:
+  application:
+    name: testSleuthFeign

spring-cloud-sleuth-samples/spring-cloud-sleuth-sample-feign/src/test/java/sample/SampleFeignApplicationTests.java

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+package sample;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = SampleFeignApplication.class)
+@WebAppConfiguration
+@TestPropertySource(properties="sample.zipkin.enabled=false")
+public class SampleFeignApplicationTests {
+
+	@Test
+	public void contextLoads() {
+	}
+
+}