| 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The Executor (thread pool)</title><meta value="Filip Hanik" name="author"><meta value="fhanik@apache.org" name="email"></head><body vlink="#525D76" alink="#525D76" link="#525D76" text="#000000" bgcolor="#ffffff"><table cellspacing="0" width="100%" border="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img border="0" alt=" |
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| 2 | The Apache Tomcat Servlet/JSP Container |
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| 3 | " align="right" src="../images/tomcat.gif"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img border="0" alt="Apache Logo" align="right" src="../images/asf-logo.gif"></a></td></tr></table><table cellspacing="4" width="100%" border="0"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><tr><!--LEFT SIDE NAVIGATION--><td nowrap="true" valign="top" width="20%"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Config Ref. Home</a></li></ul><p><strong>Top Level Elements</strong></p><ul><li><a href="server.html">Server</a></li><li><a href="service.html">Service</a></li></ul><p><strong>Executors</strong></p><ul><li><a href="executor.html">Executor</a></li></ul><p><strong>Connectors</strong></p><ul><li><a href="http.html">HTTP</a></li><li><a href="ajp.html">AJP</a></li></ul><p><strong>Containers</strong></p><ul><li><a href="context.html">Context</a></li><li><a href="engine.html">Engine</a></li><li><a href="host.html">Host</a></li><li><a href="cluster.html">Cluster</a></li></ul><p><strong>Nested Components</strong></p><ul><li><a href="globalresources.html">Global Resources</a></li><li><a href="loader.html">Loader</a></li><li><a href="manager.html">Manager</a></li><li><a href="realm.html">Realm</a></li><li><a href="resources.html">Resources</a></li><li><a href="valve.html">Valve</a></li></ul><p><strong>Cluster Elements</strong></p><ul><li><a href="cluster.html">Cluster</a></li><li><a href="cluster-manager.html">Manager</a></li><li><a href="cluster-channel.html">Channel</a></li><li><a href="cluster-membership.html">Channel/Membership</a></li><li><a href="cluster-sender.html">Channel/Sender</a></li><li><a href="cluster-receiver.html">Channel/Receiver</a></li><li><a href="cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="cluster-valve.html">Valve</a></li><li><a href="cluster-deployer.html">Deployer</a></li><li><a href="cluster-listener.html">ClusterListener</a></li></ul><p><strong>Global Settings</strong></p><ul><li><a href="systemprops.html">System properties</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td align="left" valign="top" width="80%"><table cellspacing="4" width="100%" border="0"><tr><td valign="top" align="left"><h1>Apache Tomcat Configuration Reference</h1><h2>The Executor (thread pool)</h2></td><td nowrap="true" valign="top" align="right"><small><a href="printer/executor.html"><img alt="Printer Friendly Version" border="0" src="../images/printer.gif"><br>print-friendly<br>version |
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| 4 | </a></small></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> |
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| 5 | |
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| 6 | <p>The <strong>Executor</strong> represents a thread pool that can be shared |
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| 7 | between components in Tomcat. Historically there has been a thread pool per |
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| 8 | connector created but this allows you to share a thread pool, between (primarly) connector |
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| 9 | but also other components when those get configured to support executors</p> |
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| 10 | |
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| 11 | |
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| 12 | <p>The executor has to implement the <code>org.apache.catalina.Executor</code> interface.</p> |
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| 13 | |
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| 14 | <p>The executor is a nested element to the <a href="service.html">Service</a> element. |
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| 15 | And in order for it to be picked up by the connectors, the Executor element has to appear |
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| 16 | prior to the Connector element in server.xml</p> |
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| 17 | </blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 18 | |
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| 19 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Common Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> |
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| 20 | |
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| 21 | <p>All implementations of <strong>Executor</strong> |
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| 22 | support the following attributes:</p> |
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| 23 | |
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| 24 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>className</code></td><td valign="center" align="left"> |
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| 25 | <p>The class of the implementation. The implementation has to implement the |
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| 26 | <code>org.apache.catalina.Executor</code> interface. |
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| 27 | This interface ensures that the object can be referenced through its <code>name</code> attribute |
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| 28 | and that implements Lifecycle, so that it can be started and stopped with the container. |
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| 29 | The default value for the className is <code>org.apache.catalina.core.StandardThreadExecutor</code></p> |
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| 30 | </td></tr><tr><td valign="center" align="left"><strong><code>name</code></strong></td><td valign="center" align="left"> |
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| 31 | <p>The name used to reference this pool in other places in server.xml. |
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| 32 | The name is required and must be unique.</p> |
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| 33 | </td></tr></table> |
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| 34 | |
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| 35 | </blockquote></td></tr></table> |
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| 36 | |
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| 37 | <table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Standard Implementation"><strong>Standard Implementation</strong></a></font></td></tr><tr><td><blockquote> |
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| 38 | |
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| 39 | <p> |
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| 40 | The default implementation supports the following attributes:</p> |
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| 41 | |
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| 42 | <table cellpadding="5" border="1"><tr><th bgcolor="#023264" width="15%"><font color="#ffffff">Attribute</font></th><th bgcolor="#023264" width="85%"><font color="#ffffff">Description</font></th></tr><tr><td valign="center" align="left"><code>threadPriority</code></td><td valign="center" align="left"> |
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| 43 | <p>(int) The thread priority for threads in the executor, the default is <code>Thread.NORM_PRIORITY</code></p> |
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| 44 | </td></tr><tr><td valign="center" align="left"><code>daemon</code></td><td valign="center" align="left"> |
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| 45 | <p>(boolean) Whether the threads should be daemon threads or not, the default is <code>true</code></p> |
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| 46 | </td></tr><tr><td valign="center" align="left"><code>namePrefix</code></td><td valign="center" align="left"> |
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| 47 | <p>(String) The name prefix for each thread created by the executor. |
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| 48 | The thread name for an individual thread will be <code>namePrefix+threadNumber</code></p> |
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| 49 | </td></tr><tr><td valign="center" align="left"><code>maxThreads</code></td><td valign="center" align="left"> |
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| 50 | <p>(int) The max number of active threads in this pool, default is <code>200</code></p> |
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| 51 | </td></tr><tr><td valign="center" align="left"><code>minSpareThreads</code></td><td valign="center" align="left"> |
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| 52 | <p>(int) The minimum number of threads always kept alive, default is <code>25</code></p> |
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| 53 | </td></tr><tr><td valign="center" align="left"><code>maxIdleTime</code></td><td valign="center" align="left"> |
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| 54 | <p>(int) The number of milliseconds before an idle thread shutsdown, unless the number of active threads are less |
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| 55 | or equal to minSpareThreads. Default value is <code>60000</code>(1 minute)</p> |
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| 56 | </td></tr></table> |
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| 57 | |
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| 58 | |
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| 59 | </blockquote></td></tr></table> |
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| 60 | </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font size="-1" color="#525D76"><em> |
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| 61 | Copyright © 1999-2008, Apache Software Foundation |
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| 62 | </em></font></div></td></tr></table></body></html> |
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