Sleuth now uses Brave (#829)

with this pull request we have rewritten the whole Sleuth internals to use Brave. That way we can leverage all the functionalities & instrumentations that Brave already has (https://github.com/openzipkin/brave/tree/master/instrumentation).

Migration guide is available here: https://github.com/spring-cloud/spring-cloud-sleuth/wiki/Spring-Cloud-Sleuth-2.0-Migration-Guide

fixes #711 - Brave instrumentation
fixes #92 - we move to Brave's Sampler
fixes #143 - Brave is capable of passing context
fixes #255 - we've moved away from Zipkin Stream server
fixes #305 - Brave has GRPC instrumentation (https://github.com/openzipkin/brave/tree/master/instrumentation/grpc)
fixes #459 - Brave (openzipkin/brave#510) & Zipkin (openzipkin/zipkin#1754) will deal with the AWS XRay instrumentation
fixes #577 - Messaging instrumentation has been rewritten

benchmarks/src/main/java/org/springframework/cloud/sleuth/benchmarks/app/SleuthBenchmarkingSpringApp.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2017 the original author or authors.
+ * Copyright 2013-2018 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.
@@ -21,7 +21,6 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
-
 import javax.annotation.PreDestroy;
 
 import org.apache.commons.logging.Log;
@@ -30,9 +29,9 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;
-import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
+import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
 import org.springframework.boot.web.servlet.context.ServletWebServerInitializedEvent;
+import org.springframework.boot.web.servlet.server.ServletWebServerFactory;
 import org.springframework.cloud.sleuth.Sampler;
 import org.springframework.cloud.sleuth.Span;
 import org.springframework.cloud.sleuth.Tracer;
@@ -40,9 +39,7 @@ import org.springframework.cloud.sleuth.annotation.ContinueSpan;
 import org.springframework.cloud.sleuth.annotation.NewSpan;
 import org.springframework.cloud.sleuth.annotation.SpanTag;
 import org.springframework.cloud.sleuth.sampler.AlwaysSampler;
-import org.springframework.cloud.sleuth.util.ArrayListSpanAccumulator;
 import org.springframework.context.ApplicationListener;
-import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.scheduling.annotation.Async;
 import org.springframework.scheduling.annotation.EnableAsync;
@@ -102,9 +99,9 @@ public class SleuthBenchmarkingSpringApp implements
 	}
 
 	@Bean
-	public EmbeddedServletContainerFactory servletContainer(@Value("${server.port:0}") int serverPort) {
+	public ServletWebServerFactory servletContainer(@Value("${server.port:0}") int serverPort) {
 		log.info("Starting container at port [" + serverPort + "]");
-		return new TomcatEmbeddedServletContainerFactory(serverPort == 0 ? SocketUtils.findAvailableTcpPort() : serverPort);
+		return new TomcatServletWebServerFactory(serverPort == 0 ? SocketUtils.findAvailableTcpPort() : serverPort);
 	}
 
 	@PreDestroy

benchmarks/src/main/java/org/springframework/cloud/sleuth/benchmarks/jmh/benchmarks/AnnotationBenchmarks.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2016 the original author or authors.
+ * Copyright 2013-2018 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.

benchmarks/src/main/java/org/springframework/cloud/sleuth/benchmarks/jmh/benchmarks/AsyncBenchmarks.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2017 the original author or authors.
+ * Copyright 2013-2018 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.

benchmarks/src/main/java/org/springframework/cloud/sleuth/benchmarks/jmh/benchmarks/HttpFilterBenchmarks.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2017 the original author or authors.
+ * Copyright 2013-2018 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.

benchmarks/src/main/java/org/springframework/cloud/sleuth/benchmarks/jmh/benchmarks/RestTemplateBenchmark.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2017 the original author or authors.
+ * Copyright 2013-2018 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.

benchmarks/src/test/java/org/springframework/cloud/sleuth/benchmarks/jmh/RunSleuthJmhBenchmarksFromIde.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2017 the original author or authors.
+ * Copyright 2013-2018 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.

benchmarks/src/test/jmeter/jmeter.properties

@@ -1,5 +1,5 @@
 #
-# Copyright 2013-2017 the original author or authors.
+# Copyright 2013-2018 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.