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reference/html/sagan-boot.html
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reference/html/sagan-boot.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<!--[if IE]><meta http-equiv="X-UA-Compatible" content="IE=edge"><![endif]-->
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="Asciidoctor 1.5.7.1">
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<title>Untitled</title>
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<link rel="stylesheet" href="css/spring.css">
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
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<style>
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.hidden {
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display: none;
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}
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.switch {
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border-width: 1px 1px 0 1px;
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border-style: solid;
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border-color: #7a2518;
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display: inline-block;
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}
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.switch--item {
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padding: 10px;
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background-color: #ffffff;
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color: #7a2518;
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display: inline-block;
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cursor: pointer;
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}
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.switch--item:not(:first-child) {
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border-width: 0 0 0 1px;
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border-style: solid;
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border-color: #7a2518;
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}
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.switch--item.selected {
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background-color: #7a2519;
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color: #ffffff;
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}
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</style>
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<script src="https://cdnjs.cloudflare.com/ajax/libs/zepto/1.2.0/zepto.min.js"></script>
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<script type="text/javascript">
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function addBlockSwitches() {
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$('.primary').each(function() {
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primary = $(this);
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createSwitchItem(primary, createBlockSwitch(primary)).item.addClass("selected");
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primary.children('.title').remove();
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});
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$('.secondary').each(function(idx, node) {
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secondary = $(node);
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primary = findPrimary(secondary);
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switchItem = createSwitchItem(secondary, primary.children('.switch'));
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switchItem.content.addClass('hidden');
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findPrimary(secondary).append(switchItem.content);
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secondary.remove();
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});
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}
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function createBlockSwitch(primary) {
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blockSwitch = $('<div class="switch"></div>');
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primary.prepend(blockSwitch);
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return blockSwitch;
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}
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function findPrimary(secondary) {
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candidate = secondary.prev();
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while (!candidate.is('.primary')) {
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candidate = candidate.prev();
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}
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return candidate;
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}
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function createSwitchItem(block, blockSwitch) {
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blockName = block.children('.title').text();
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content = block.children('.content').first().append(block.next('.colist'));
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item = $('<div class="switch--item">' + blockName + '</div>');
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item.on('click', '', content, function(e) {
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$(this).addClass('selected');
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$(this).siblings().removeClass('selected');
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e.data.siblings('.content').addClass('hidden');
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e.data.removeClass('hidden');
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});
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blockSwitch.append(item);
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return {'item': item, 'content': content};
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}
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$(addBlockSwitches);
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</script>
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</head>
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<body class="book">
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<div id="header">
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</div>
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<div id="content">
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<div id="preamble">
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<div class="sectionbody">
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<div class="paragraph">
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<p>Add Sleuth to your classpath:</p>
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</div>
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<div class="paragraph">
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<p>Maven</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-sleuth</artifactId>
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<version>${spring-cloud-sleuth.version}</version>
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<type>pom</type>
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<scope>import</scope>
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</dependency>
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</dependencies>
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</dependencyManagement>
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<dependencies>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-sleuth</artifactId>
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</dependency>
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</dependencies></code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Gradle</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-groovy hljs" data-lang="groovy">buildscript {
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dependencies {
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classpath "io.spring.gradle:dependency-management-plugin:0.5.2.RELEASE"
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}
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}
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apply plugin: "io.spring.dependency-management"
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dependencyManagement {
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imports {
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mavenBom "org.springframework.cloud:spring-cloud-sleuth:${springCloudSleuthVersion}"
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}
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}
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dependencies {
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compile 'org.springframework.cloud:spring-cloud-starter-sleuth'
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}</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>As long as Spring Cloud Sleuth is on the classpath any Spring Boot application will generate trace data:</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@SpringBootApplication
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@RestController
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public class Application {
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private static Logger log = LoggerFactory.getLogger(DemoController.class);
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@RequestMapping("/")
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public String home() {
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log.info("Handling home");
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return "Hello World";
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}
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Run this app and then hit the home page. You will see traceId and spanId populated in the logs. If this app calls out to another one (e.g. with <code>RestTemplate</code>) it will send the trace data in headers and if the receiver is another Sleuth app you will see the trace continue there.</p>
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</div>
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<div class="admonitionblock important">
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<table>
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<tr>
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<td class="icon">
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<i class="fa icon-important" title="Important"></i>
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</td>
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<td class="content">
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instead of logging the request in the handler explicitly, you could set <code>logging.level.org.springframework.web.servlet.DispatcherServlet=DEBUG</code>
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</td>
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</tr>
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</table>
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</div>
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<div class="admonitionblock important">
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<table>
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<tr>
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<td class="icon">
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<i class="fa icon-important" title="Important"></i>
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</td>
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<td class="content">
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If you use Zipkin, configure the probability of spans exported by setting (for <code>2.0.x</code>) <code>spring.sleuth.sampler.probability</code> or (up till <code>2.0.x</code>)<code>spring.sleuth.sampler.percentage</code> (default: 0.1, which is 10 percent). Otherwise, you might think that Sleuth is not working because it omits some spans.
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</td>
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</tr>
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</table>
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</div>
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<div class="admonitionblock important">
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<table>
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<tr>
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<td class="icon">
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<i class="fa icon-important" title="Important"></i>
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</td>
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<td class="content">
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Set <code>spring.application.name=bar</code> (for instance) to see the service name as well as the trace and span ids.
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</td>
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</tr>
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</table>
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</div>
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</div>
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</div>
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</div>
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<script type="text/javascript" src="js/tocbot/tocbot.min.js"></script>
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<script type="text/javascript" src="js/toc.js"></script>
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<link rel="stylesheet" href="js/highlight/styles/atom-one-dark-reasonable.min.css">
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<script src="js/highlight/highlight.min.js"></script>
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<script>hljs.initHighlighting()</script>
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</body>
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</html>
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