| Hongqing Liu | fd5ee81 | 2014-05-10 16:32:51 +0800 | [diff] [blame^] | 1 | <html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference (6.0.39) - The Executor (thread pool)</title><meta name="author" content="Filip Hanik"><style type="text/css" media="print">
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| 4 | </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="
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| 5 | The Apache Tomcat Servlet/JSP Container
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| 6 | " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 6.0</font></h1><font face="arial,helvetica,sanserif">Version 6.0.39, Jan 27 2014</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="noshade" size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap="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="globalresources.html">Global Resources</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>Other</strong></p><ul><li><a href="filter.html">Filter</a></li><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>Apache Tomcat Configuration Reference</h1><h2>The Executor (thread pool)</h2><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>
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| 7 | <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>
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| 8 | </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>
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| 9 |
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| 10 | <p>The <strong>Executor</strong> represents a thread pool that can be shared
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| 11 | between components in Tomcat. Historically there has been a thread pool per
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| 12 | connector created but this allows you to share a thread pool, between (primarly) connector
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| 13 | but also other components when those get configured to support executors</p>
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| 14 |
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| 15 |
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| 16 | <p>The executor has to implement the <code>org.apache.catalina.Executor</code> interface.</p>
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| 17 |
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| 18 | <p>The executor is a nested element to the <a href="service.html">Service</a> element.
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| 19 | And in order for it to be picked up by the connectors, the Executor element has to appear
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| 20 | prior to the Connector element in server.xml</p>
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| 21 | </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>
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| 22 |
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| 23 | <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>
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| 24 |
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| 25 | <p>All implementations of <strong>Executor</strong>
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| 26 | support the following attributes:</p>
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| 27 |
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| 28 | <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">
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| 29 | <p>The class of the implementation. The implementation has to implement the
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| 30 | <code>org.apache.catalina.Executor</code> interface.
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| 31 | This interface ensures that the object can be referenced through its <code>name</code> attribute
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| 32 | and that implements Lifecycle, so that it can be started and stopped with the container.
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| 33 | The default value for the className is <code>org.apache.catalina.core.StandardThreadExecutor</code></p>
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| 34 | </td></tr><tr><td align="left" valign="center"><strong><code>name</code></strong></td><td align="left" valign="center">
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| 35 | <p>The name used to reference this pool in other places in server.xml.
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| 36 | The name is required and must be unique.</p>
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| 37 | </td></tr></table>
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| 38 |
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| 39 | </blockquote></td></tr></table>
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| 40 |
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| 41 | <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>
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| 42 |
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| 43 | <p>
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| 44 | The default implementation supports the following attributes:</p>
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| 45 |
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| 46 | <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">
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| 47 | <p>(int) The thread priority for threads in the executor, the default is
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| 48 | <code>5</code> (the value of the <code>Thread.NORM_PRIORITY</code> constant)</p>
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| 49 | </td></tr><tr><td align="left" valign="center"><code>daemon</code></td><td align="left" valign="center">
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| 50 | <p>(boolean) Whether the threads should be daemon threads or not, the default is <code>true</code></p>
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| 51 | </td></tr><tr><td align="left" valign="center"><code>namePrefix</code></td><td align="left" valign="center">
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| 52 | <p>(String) The name prefix for each thread created by the executor.
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| 53 | The thread name for an individual thread will be <code>namePrefix+threadNumber</code></p>
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| 54 | </td></tr><tr><td align="left" valign="center"><code>maxThreads</code></td><td align="left" valign="center">
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| 55 | <p>(int) The max number of active threads in this pool, default is <code>200</code></p>
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| 56 | </td></tr><tr><td align="left" valign="center"><code>minSpareThreads</code></td><td align="left" valign="center">
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| 57 | <p>(int) The minimum number of threads always kept alive, default is <code>25</code></p>
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| 58 | </td></tr><tr><td align="left" valign="center"><code>maxIdleTime</code></td><td align="left" valign="center">
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| 59 | <p>(int) The number of milliseconds before an idle thread shutsdown, unless the number of active threads are less
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| 60 | or equal to minSpareThreads. Default value is <code>60000</code>(1 minute)</p>
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| 61 | </td></tr><tr><td align="left" valign="center"><code>maxQueueSize</code></td><td align="left" valign="center">
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| 62 | <p>(int) The maximum number of runnable tasks that can queue up awaiting
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| 63 | execution before we reject them. Default value is <code>Integer.MAX_VALUE</code></p>
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| 64 | </td></tr></table>
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| 65 |
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| 66 |
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| 67 | </blockquote></td></tr></table>
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| 68 | </blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
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| 69 | Copyright © 1999-2014, Apache Software Foundation
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| 70 | </em></font></div></td></tr></table></body></html> |