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   <title>Statistics Handler</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty"><link rel="up" href="advanced-extras.html" title="Chapter&nbsp;18.&nbsp;Provided Servlets, Filters, and Handlers"><link rel="prev" href="debug-handler.html" title="Debug Handler"><link rel="next" href="ipaccess-handler.html" title="IP Access Handler"><link xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" rel="shortcut icon" href="images/favicon.ico"><link rel="stylesheet" href="css/highlighter/foundation.css"><script src="js/highlight.pack.js"></script><script>
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            Version: 9.4.28-SNAPSHOT</span></td><td style="width: 50%"></td></tr></table><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Statistics Handler</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="debug-handler.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a>&nbsp;</td><th width="60%" align="center">Chapter&nbsp;18.&nbsp;Provided Servlets, Filters, and Handlers<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right">&nbsp;<a accesskey="n" href="ipaccess-handler.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr></table><hr></div><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="jetty-callout"><h5 class="callout"><a href="http://www.webtide.com/">Contact the core Jetty developers at
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      </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="statistics-handler"></a>Statistics Handler</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="statistics-handler.html#statistics-handler-metadata">Info</a></span></dt><dt><span class="section"><a href="statistics-handler.html#statistics-handler-usage">Usage</a></span></dt><dt><span class="section"><a href="statistics-handler.html#connector-statistics">Connector statistics</a></span></dt><dt><span class="section"><a href="statistics-handler.html#request-statistics">Request Statistics</a></span></dt><dt><span class="section"><a href="statistics-handler.html#session-statistics">Session Statistics</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="statistics-handler-metadata"></a>Info</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Classname: <code class="literal">org.eclipse.jetty.server.handler.StatisticsHandler</code></li><li class="listitem">Maven Artifact: org.eclipse.jetty:jetty-server</li><li class="listitem">Javadoc: <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.4.28-SNAPSHOT/org/eclipse/jetty/server/handler/StatisticsHandler.html" target="_top">http://www.eclipse.org/jetty/javadoc/9.4.28-SNAPSHOT/org/eclipse/jetty/server/handler/StatisticsHandler.html</a></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="statistics-handler-usage"></a>Usage</h3></div></div></div><p>Jetty currently has two levels of request statistic collection:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Subclasses of <code class="literal">AbstractConnector</code> class optionally can collect statistics about connections as well as number of requests.</li><li class="listitem">The <code class="literal">StatisticsHandler</code> class may be used to collect request statistics.</li></ul></div><p>In addition to these, subclasses of the <code class="literal">SessionHandler</code> and <code class="literal">DefaultSessionCache</code> classes optionally can collect session statistics.</p><p><code class="literal">AbstractConnector</code>, <code class="literal">SessionHandler</code> and <code class="literal">DefaultSessionCache</code> statistics are turned off by default and must either be configured manually for each instance or turned on via JMX interface.
The <code class="literal">StatisticsHandler</code> is not included in default Jetty configuration, and needs to be configured manually.</p><div class="blockquote"><blockquote class="blockquote"><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title"><i class="fa fa-asterisk" aria-hidden="true"></i> Note</h3><p>To view statistics, you have to be able to connect to Jetty using either JConsole or some other JMX agent. See <a class="xref" href="jmx-chapter.html#using-jmx" title="Using JMX with Jetty">Using JMX with Jetty</a> for more information.</p></div></blockquote></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="connector-statistics"></a>Connector statistics</h3></div></div></div><p>Detailed statistics on connection duration and number of requests are only collated when a connection is closed.
The current and maximum number of connections are the only "live" statistics.</p><p>The following example shows how to turn on connector statistics in Jetty xml.
This example comes from within <code class="literal">jetty-http.xml</code>.</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>  &lt;Call name="addConnector"&gt;
    &lt;Arg&gt;
      &lt;New class="org.eclipse.jetty.server.ServerConnector"&gt;
        &lt;Arg name="server"&gt;&lt;Ref refid="Server" /&gt;&lt;/Arg&gt;
        &lt;Arg name="factories"&gt;
          &lt;Array type="org.eclipse.jetty.server.ConnectionFactory"&gt;
            &lt;Item&gt;
              &lt;New class="org.eclipse.jetty.server.HttpConnectionFactory"&gt;
                &lt;Arg name="config"&gt;&lt;Ref refid="httpConfig" /&gt;&lt;/Arg&gt;
              &lt;/New&gt;
            &lt;/Item&gt;
          &lt;/Array&gt;
        &lt;/Arg&gt;
        &lt;Set name="host"&gt;&lt;Property name="jetty.host" /&gt;&lt;/Set&gt;
        &lt;Set name="port"&gt;&lt;Property name="jetty.http.port" default="8080" /&gt;&lt;/Set&gt;
        &lt;Set name="idleTimeout"&gt;30000&lt;/Set&gt;
        &lt;!-- Enable Connection Statistics --&gt;
        &lt;Call name="addBean"&gt;
          &lt;Arg&gt;
              &lt;New id="ConnectionStatistics" class="org.eclipse.jetty.io.ConnectionStatistics"/&gt;
          &lt;/Arg&gt;
        &lt;/Call&gt;
      &lt;/New&gt;
    &lt;/Arg&gt;
  &lt;/Call&gt;</code></pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="request-statistics"></a>Request Statistics</h3></div></div></div><p>To collect request statistics a <code class="literal">StatisticsHandler</code> must be configured as one of the handlers of the server.
Typically this can be done as the top level handler, but you may choose to configure a statistics handler for just one context by creating a context configuration file.
You can enable the <code class="literal">StatisticsHandler</code> by activating the <code class="literal">stats</code> modules on the command line.</p><div class="screenexample"><pre class="screen">$ java -jar {$jetty.home}/start.jar --add-to-start=stats</pre></div><p>Alternately, if you are making multiple changes to the Jetty configuration, you could include statistics handler configuration into your own Jetty xml configuration.
The following fragment shows how to configure a top level statistics handler:</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>    &lt;Get id="oldhandler" name="handler" /&gt;
  &lt;Set name="handler"&gt;
    &lt;New id="StatsHandler" class="org.eclipse.jetty.server.handler.StatisticsHandler"&gt;
      &lt;Set name="handler"&gt;&lt;Ref refid="oldhandler" /&gt;&lt;/Set&gt;
    &lt;/New&gt;
  &lt;/Set&gt;</code></pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="session-statistics"></a>Session Statistics</h3></div></div></div><p>Session handling is built into Jetty for any servlet or webapp context.
Detailed statistics on session duration are only collated when a session is closed.
The current, minimum, and maximum number of sessions are the only "live" statistics.
The session statistics are enabled by default and do not need to be configured.</p></div></div><script type="text/javascript">
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