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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 7 Configuration Reference (7.0.16) - The Executor (thread pool)</title><meta name="author" content="Filip Hanik"><style type="text/css" media="print"> .noPrint {display: none;} td#mainBody {width: 100%;} </style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt=" The Apache Tomcat Servlet/JSP Container " border="0"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 7</h1> Version 7.0.16, Jun 11 2011</font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="../images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap class="noPrint"><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="filter.html">Filter</a></li><li><a href="globalresources.html">Global Resources</a></li><li><a href="jar-scanner.html">JarScanner</a></li><li><a href="listeners.html">Listeners</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 width="80%" valign="top" align="left" id="mainBody"><h1>The Executor (thread pool)</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"><!--()--></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote> <ul><li><a href="#Introduction">Introduction</a></li><li><a href="#Attributes">Attributes</a><ol><li><a href="#Common_Attributes">Common Attributes</a></li><li><a href="#Standard_Implementation">Standard Implementation</a></li></ol></li></ul> </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote> <p>The <strong>Executor</strong> represents a thread pool that can be shared between components in Tomcat. Historically there has been a thread pool per connector created but this allows you to share a thread pool, between (primarly) connector but also other components when those get configured to support executors</p> <p>The executor has to implement the <code>org.apache.catalina.Executor</code> interface.</p> <p>The executor is a nested element to the <a href="service.html">Service</a> element. And in order for it to be picked up by the connectors, the Executor element has to appear prior to the Connector element in server.xml</p> </blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote> <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"><!--()--></a><a name="Common_Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote> <p>All implementations of <strong>Executor</strong> support the following attributes:</p> <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code>className</code></td><td align="left" valign="center"> <p>The class of the implementation. The implementation has to implement the <code>org.apache.catalina.Executor</code> interface. This interface ensures that the object can be referenced through its <code>name</code> attribute and that implements Lifecycle, so that it can be started and stopped with the container. The default value for the className is <code>org.apache.catalina.core.StandardThreadExecutor</code></p> </td></tr><tr><td align="left" valign="center"><strong><code>name</code></strong></td><td align="left" valign="center"> <p>The name used to reference this pool in other places in server.xml. The name is required and must be unique.</p> </td></tr></table> </blockquote></td></tr></table> <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Standard Implementation"><!--()--></a><a name="Standard_Implementation"><strong>Standard Implementation</strong></a></font></td></tr><tr><td><blockquote> <p> The default implementation supports the following attributes:</p> <table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code>threadPriority</code></td><td align="left" valign="center"> <p>(int) The thread priority for threads in the executor, the default is <code>Thread.NORM_PRIORITY</code></p> </td></tr><tr><td align="left" valign="center"><code>daemon</code></td><td align="left" valign="center"> <p>(boolean) Whether the threads should be daemon threads or not, the default is <code>true</code></p> </td></tr><tr><td align="left" valign="center"><code>namePrefix</code></td><td align="left" valign="center"> <p>(String) The name prefix for each thread created by the executor. The thread name for an individual thread will be <code>namePrefix+threadNumber</code></p> </td></tr><tr><td align="left" valign="center"><code>maxThreads</code></td><td align="left" valign="center"> <p>(int) The max number of active threads in this pool, default is <code>200</code></p> </td></tr><tr><td align="left" valign="center"><code>minSpareThreads</code></td><td align="left" valign="center"> <p>(int) The minimum number of threads always kept alive, default is <code>25</code></p> </td></tr><tr><td align="left" valign="center"><code>maxIdleTime</code></td><td align="left" valign="center"> <p>(int) The number of milliseconds before an idle thread shutsdown, unless the number of active threads are less or equal to minSpareThreads. Default value is <code>60000</code>(1 minute)</p> </td></tr><tr><td align="left" valign="center"><code>prestartminSpareThreads</code></td><td align="left" valign="center"> <p>(boolean) Whether minSpareThreads should be started when starting the Executor or not, the default is <code>false</code></p> </td></tr><tr><td align="left" valign="center"><code>threadRenewalDelay</code></td><td align="left" valign="center"> <p>After a context is stopped, threads in the pool are renewed. To avoid renewing all threads at the same time, this delay is observed between 2 threads being renewed. Value is in ms, default value is 1000ms. If negative, threads are not renewed.</p> </td></tr></table> </blockquote></td></tr></table> </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em> Copyright © 1999-2011, Apache Software Foundation </em></font></div></td></tr></table></body></html>

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