Merge pull request #5276 from eclipse/jetty-9.4.x-IncludeExcludeConnectionStatistics
update documentation for statistics collection
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Lachlan
GitHub
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7e627359b3
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@ -29,60 +29,25 @@
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[[statistics-handler-usage]]
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==== Usage
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Jetty currently has two levels of request statistic collection:
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Jetty currently has two main statistics collection mechanisms:
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* Subclasses of `AbstractConnector` class optionally can collect statistics about connections as well as number of requests.
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* The `StatisticsHandler` class may be used to collect request statistics.
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* Instances of `ConnectionStatistics` can collect statistics for each connection of a connector.
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* The `StatisticsHandler` class may be used to collect statistics for HTTP requests.
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In addition to these, subclasses of the `SessionHandler` and `DefaultSessionCache` classes optionally can collect session statistics.
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The `StatisticsHandler` and `ConnectionStatistics` are not included in the default Jetty configuration, these need to be configured manually or enabled using the Jetty `stats` module on the command line.
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[source, screen, subs="{sub-order}"]
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....
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$ java -jar {$jetty.home}/start.jar --add-to-start=stats
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....
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`AbstractConnector`, `SessionHandler` and `DefaultSessionCache` statistics are turned off by default and must either be configured manually for each instance or turned on via JMX interface.
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The `StatisticsHandler` is not included in default Jetty configuration, and needs to be configured manually.
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In addition to these, the `SessionHandler` and `DefaultSessionCache` classes collect statistics for sessions.
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These statistics are enabled by default and are accessible via JMX interface.
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_____
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[NOTE]
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To view statistics, you have to be able to connect to Jetty using either JConsole or some other JMX agent. See xref:using-jmx[] for more information.
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_____
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[[connector-statistics]]
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==== Connector statistics
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Detailed statistics on connection duration and number of requests are only collated when a connection is closed.
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The current and maximum number of connections are the only "live" statistics.
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//To learn how to turn on connector statistics please see the Jetty Statistics tutorial, although this is not recommended and it is best to use a JMX agent to select statistics only when needed.
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The following example shows how to turn on connector statistics in Jetty xml.
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This example comes from within `jetty-http.xml`.
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[source, xml, subs="{sub-order}"]
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----
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<Call name="addConnector">
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<Arg>
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<New class="org.eclipse.jetty.server.ServerConnector">
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<Arg name="server"><Ref refid="Server" /></Arg>
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<Arg name="factories">
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<Array type="org.eclipse.jetty.server.ConnectionFactory">
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<Item>
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<New class="org.eclipse.jetty.server.HttpConnectionFactory">
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<Arg name="config"><Ref refid="httpConfig" /></Arg>
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</New>
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</Item>
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</Array>
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</Arg>
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<Set name="host"><Property name="jetty.host" /></Set>
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<Set name="port"><Property name="jetty.http.port" default="8080" /></Set>
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<Set name="idleTimeout">30000</Set>
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<!-- Enable Connection Statistics -->
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<Call name="addBean">
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<Arg>
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<New id="ConnectionStatistics" class="org.eclipse.jetty.io.ConnectionStatistics"/>
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</Arg>
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</Call>
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</New>
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</Arg>
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</Call>
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----
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[[request-statistics]]
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==== Request Statistics
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@ -90,22 +55,53 @@ To collect request statistics a `StatisticsHandler` must be configured as one of
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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.
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You can enable the `StatisticsHandler` by activating the `stats` modules on the command line.
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[source, screen, subs="{sub-order}"]
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....
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$ java -jar {$jetty.home}/start.jar --add-to-start=stats
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....
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Alternately, if you are making multiple changes to the Jetty configuration, you could include statistics handler configuration into your own Jetty xml configuration.
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The following fragment shows how to configure a top level statistics handler:
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[source, xml, subs="{sub-order}"]
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----
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<Get id="oldhandler" name="handler" />
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<Set name="handler">
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<New id="StatsHandler" class="org.eclipse.jetty.server.handler.StatisticsHandler">
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<Set name="handler"><Ref refid="oldhandler" /></Set>
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</New>
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</Set>
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<Configure id="Server" class="org.eclipse.jetty.server.Server">
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<Call name="insertHandler">
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<Arg>
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<New id="StatsHandler" class="org.eclipse.jetty.server.handler.StatisticsHandler"/>
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</Arg>
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</Call>
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</Configure>
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----
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[[connection-statistics]]
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==== Connection Statistics
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Detailed statistics on connection duration and number of messages are only collated when a connection is closed.
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The current and maximum number of connections are the only "live" statistics.
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The following example shows how to turn on connection statistics in the Jetty XML format.
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[source, xml, subs="{sub-order}"]
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----
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<Configure id="Server" class="org.eclipse.jetty.server.Server">
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<Call name="addBeanToAllConnectors">
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<Arg>
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<New class="org.eclipse.jetty.io.ConnectionStatistics"/>
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</Arg>
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</Call>
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</Configure>
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----
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A special variant of `ConnectionStatistics` called `IncludeExcludeConnectionStatistics` allows you to refine which types of connection you want to collect statistics for.
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The following example shows how this can be used to record statistics only for WebSocket connections.
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[source, xml, subs="{sub-order}"]
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----
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<Configure id="Server" class="org.eclipse.jetty.server.Server">
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<Call name="addBeanToAllConnectors">
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<Arg>
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<New class="org.eclipse.jetty.io.IncludeExcludeConnectionStatistics">
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<Call name="include" arg="org.eclipse.jetty.websocket.common.io.AbstractWebSocketConnection"/>
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</New>
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</Arg>
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</Call>
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</Configure>
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----
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[[session-statistics]]
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@ -92,10 +92,7 @@ public class DefaultSessionCache extends AbstractSessionCache
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{
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if (id == null)
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return null;
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Session session = _sessions.get(id);
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return session;
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return _sessions.get(id);
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}
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@Override
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@ -177,21 +174,18 @@ public class DefaultSessionCache extends AbstractSessionCache
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@Override
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public Session newSession(HttpServletRequest request, SessionData data)
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{
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Session s = new Session(getSessionHandler(), request, data);
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return s;
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return new Session(getSessionHandler(), request, data);
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}
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@Override
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public Session newSession(SessionData data)
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{
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Session s = new Session(getSessionHandler(), data);
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return s;
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return new Session(getSessionHandler(), data);
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}
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@Override
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public boolean doReplace(String id, Session oldValue, Session newValue)
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{
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boolean result = _sessions.replace(id, oldValue, newValue);
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return result;
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return _sessions.replace(id, oldValue, newValue);
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}
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}
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