146 lines
8.1 KiB
HTML
146 lines
8.1 KiB
HTML
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<html lang="en"><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><link href="../images/docs-stylesheet.css" rel="stylesheet" type="text/css"><title>Apache Tomcat 8 Architecture (8.0.53) - Architecture Overview</title><meta name="author" content="Yoav Shapira"><script type="application/javascript" data-comments-identifier="tomcat-8.0-doc/architecture/overview">
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</script></head><body><div id="wrapper"><header><div id="header"><div><div><div class="logo noPrint"><a href="https://tomcat.apache.org/"><img alt="Tomcat Home" src="../images/tomcat.png"></a></div><div style="height: 1px;"></div><div class="asfLogo noPrint"><a href="https://www.apache.org/" target="_blank"><img src="../images/asf-logo.svg" alt="The Apache Software Foundation" style="width: 266px; height: 83px;"></a></div><h1>Apache Tomcat 8 Architecture</h1><div class="versionInfo">
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Version 8.0.53,
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<time datetime="2018-06-29">Jun 29 2018</time></div><div style="height: 1px;"></div><div style="clear: left;"></div></div></div></div></header><div id="middle"><div><div id="mainLeft" class="noprint"><div><nav><div><h2>Links</h2><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Architecture Home</a></li><li><a href="https://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul></div><div><h2>Contents</h2><ul><li><a href="index.html">Contents</a></li><li><a href="overview.html">Overview</a></li><li><a href="startup.html">Server Startup</a></li><li><a href="requestProcess.html">Request Process</a></li></ul></div></nav></div></div><div id="mainRight"><div id="content"><h2>Architecture Overview</h2><h3 id="Overview">Overview</h3><div class="text">
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<p>
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This page provides an overview of the Tomcat server architecture.
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</p>
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</div><h3 id="Terms">Terms</h3><div class="text">
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<div class="subsection"><h4 id="Server">Server</h4><div class="text">
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<p>
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In the Tomcat world, a
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<a href="../config/server.html">Server</a> represents the whole container.
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Tomcat provides a default implementation of the
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<a href="../api/org/apache/catalina/Server.html">Server interface</a>
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which is rarely customized by users.
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</p>
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</div></div>
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<div class="subsection"><h4 id="Service">Service</h4><div class="text">
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<p>
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A <a href="../config/service.html">Service</a> is an intermediate component
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which lives inside a Server and ties one or more Connectors to exactly one
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Engine. The Service element is rarely customized by users, as the default
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implementation is simple and sufficient:
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<a href="../api/org/apache/catalina/Service.html">Service interface</a>.
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</p>
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</div></div>
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<div class="subsection"><h4 id="Engine">Engine</h4><div class="text">
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<p>
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An
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<a href="../config/engine.html">Engine</a> represents request processing
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pipeline for a specific Service. As a Service may have multiple Connectors,
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the Engine receives and processes all requests from these connectors, handing
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the response back to the appropriate connector for transmission to the client.
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The <a href="../api/org/apache/catalina/Engine.html">Engine interface</a>
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may be implemented to supply custom Engines, though this is uncommon.
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</p>
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<p>
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Note that the Engine may be used for Tomcat server clustering via the
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jvmRoute parameter. Read the Clustering documentation for more information.
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</p>
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</div></div>
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<div class="subsection"><h4 id="Host">Host</h4><div class="text">
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<p>
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A <a href="../config/host.html">Host</a> is an association of a network name,
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e.g. www.yourcompany.com, to the Tomcat server. An Engine may contain
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multiple hosts, and the Host element also supports network aliases such as
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yourcompany.com and abc.yourcompany.com. Users rarely create custom
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<a href="../api/org/apache/catalina/Host.html">Hosts</a>
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because the
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<a href="../api/org/apache/catalina/core/StandardHost.html">StandardHost
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implementation</a> provides significant additional functionality.
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</p>
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</div></div>
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<div class="subsection"><h4 id="Connector">Connector</h4><div class="text">
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<p>
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A Connector handles communications with the client. There are multiple
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connectors available with Tomcat. These include the
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<a href="../config/http.html">HTTP connector</a> which is used for
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most HTTP traffic, especially when running Tomcat as a standalone server,
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and the <a href="../config/ajp.html">AJP connector</a> which implements
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the AJP protocol used when connecting Tomcat to a web server such as
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Apache HTTPD server. Creating a customized connector is a significant
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effort.
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</p>
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</div></div>
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<div class="subsection"><h4 id="Context">Context</h4><div class="text">
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<p>
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A
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<a href="../config/context.html">Context</a>
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represents a web application. A Host may contain multiple
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contexts, each with a unique path. The
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<a href="../api/org/apache/catalina/Context.html">Context
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interface</a> may be implemented to create custom Contexts, but
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this is rarely the case because the
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<a href="../api/org/apache/catalina/core/StandardContext.html">
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StandardContext</a> provides significant additional functionality.
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</p>
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</div></div>
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</div><h3 id="Comments">Comments</h3><div class="text">
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<p>
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Tomcat is designed to be a fast and efficient implementation of the
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Servlet Specification. Tomcat came about as the reference implementation
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of this specification, and has remained rigorous in adhering to the
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specification. At the same time, significant attention has been paid
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to Tomcat's performance and it is now on par with other servlet containers,
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including commercial ones.
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</p>
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<p>
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In recent releases of Tomcat, mostly starting with Tomcat 5,
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we have begun efforts to make more aspects of Tomcat manageable via
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JMX. In addition, the Manager and Admin webapps have been greatly
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enhanced and improved. Manageability is a primary area of concern
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for us as the product matures and the specification becomes more
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stable.
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</p>
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</div><div class="noprint"><h3 id="comments_section">
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Comments
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</h3><div class="text"><p class="notice"><strong>Notice: </strong>This comments section collects your suggestions
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on improving documentation for Apache Tomcat.<br><br>
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If you have trouble and need help, read
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<a href="https://tomcat.apache.org/findhelp.html">Find Help</a> page
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and ask your question on the tomcat-users
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<a href="https://tomcat.apache.org/lists.html">mailing list</a>.
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Do not ask such questions here. This is not a Q&A section.<br><br>
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The Apache Comments System is explained <a href="../comments.html">here</a>.
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Comments may be removed by our moderators if they are either
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implemented or considered invalid/off-topic.
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</p><div id="comments_thread"></div></div></div></div></div></div></div><footer><div id="footer">
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