Tomcat example source code file (fs-admin-apps.xml)
The Tomcat fs-admin-apps.xml source code<?xml version="1.0"?>
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<!DOCTYPE document [
<!ENTITY project SYSTEM "project.xml">
]>
<document url="fs-admin-apps.html">
&project;
<properties>
<author email="craigmcc@apache.org">Craig McClanahan
<title>Administrative Apps - Overall Requirements
<revision>$Id: fs-admin-apps.xml 562814 2007-08-05 03:52:04Z markt $
</properties>
<body>
<section name="Overview">
<subsection name="Introduction">
<p>The purpose of this specification is to define high level requirements
for administrative applications that can be used to manage the operation
of a running Tomcat 5 container. A variety of <em>Access Methods
to the supported administrative functionality shall be supported, to
meet varying requirements:</p>
<ul>
<li>As A Scriptable Web Application - The existing
<code>Manager web application provides a simple HTTP-based
interface for managing Tomcat through commands that are expressed
entirely through a request URI. This is useful in environments
where you wish to script administrative commands with tools that
can generate HTTP transactions.</li>
<li>As An HTML-Based Web Application - Use an HTML presentation
to provide a GUI-like user interface for humans to interact with the
administrative capabilities.</li>
<li>As SOAP-Based Web Services - The operational commands to
administer Tomcat are made available as web services that utilize
SOAP message formats.</li>
<li>As Java Management Extensions (JMX) Commands - The operational
commands to administer Tomcat are made available through JMX APIs,
for integration into management consoles that utilize them.</li>
<li>Other Remote Access APIs - Other remote access APIs, such
as JINI, RMI, and CORBA can also be utilized to access administrative
capabilities.</li>
</ul>
<p>Underlying all of the access methods described above, it is assumed
that the actual operations are performed either directly on the
corresponding Catalina components (such as calling the
<code>Deployer.deploy() method to deploy a new web application),
or through a "business logic" layer that can be shared across all of the
access methods. This approach minimizes the cost of adding new
administrative capabilities later -- it is only necessary to add the
corresponding business logic function, and then write adapters to it for
all desired access methods.</p>
<p>The current status of this functional specification is
<strong>PROPOSED. It has not yet been discussed and
agreed to on the TOMCAT-DEV mailing list.</p>
</subsection>
<subsection name="External Specifications">
<p>The implementation of this functionality depends on the following
external specifications:</p>
<ul>
<li>Java
IDL</a> (for CORBA, included in the JDK)
<li>
Java Management Extensions</a>
<li>Remote
Method Invocation</a> (Included in the JDK)
</ul>
</subsection>
<subsection name="Implementation Requirements">
<p>The implementation of this functionality shall conform to the
following requirements:</p>
<ul>
<li>To the maximum extent feasible, all administrative functions,
and the access methods that support them, shall run portably
on all platforms where Tomcat 5 itself runs.</li>
<li>In a default Tomcat distribution, all administrative capabilities
shall be disabled. It shall be necessary for a system
administrator to specifically enable the desired access methods
(such as by adding a username/password with a specific role to
the Tomcat user's database.</li>
<li>Administrative functions shall be realized as direct calls to
corresponding Catalina APIs, or through a business logic layer
that is independent of the access method used to initiate it.</li>
<li>The common business logic components shall be implemented in
package <code>org.apache.catalina.admin.
<li>The common business logic components shall be built as part of the
standard Catalina build process, and made visible in the
Catalina class loader.</li>
<li>The Java components required for each access method shall be
implemented in subpackages of <code>org.apache.catalina.admin.
</li>
<li>The build scripts should treat each access method as optional,
so that it will be built only if the corresponding required
APIs are present at build time.</li>
<li>It shall be possible to save the configured state of the running
Tomcat container such that this state can be reproduced when the
container is shut down and restarted.</li>
<li>Adminstrative commands to start up and shut down the overall
Tomcat container are <strong>out of scope for the
purposes of these applications. It is assumed that other
(usually platform-specific) mechanisms will be used for container
startup and shutdown.</li>
</ul>
</subsection>
</section>
<section name="Dependencies">
<subsection name="Environmental Dependencies">
<p>The following environmental dependencies must be met in order for
administrative applications to operate correctly:</p>
<ul>
<li>For access methods that require creation of server sockets, the
appropriate ports must be configured and available.</li>
</ul>
</subsection>
<subsection name="Container Dependencies">
<p>Correct operation of administrative applications depends on the
following specific features of the surrounding container:</p>
<ul>
<li>To the maximum extent feasible, Catalina components that offer
direct administrative APIs and property setters shall support
"live" changes to their operation, without requiring a container
restart.</li>
</ul>
</subsection>
<subsection name="External Technologies">
<p>The availability of the following technologies can be assumed
for the implementation and operation of the various access methods
and the corresponding administrative business logic:</p>
<ul>
<li>Java 2 Standard Edition
(Version 1.2 or later)</li>
<li>Servlet 2.4
(supported natively by Tomcat 5)</li>
<li>JavaServer Pages 2.0
(supported natively by Tomcat 5)</li>
<li>JavaServer Pages Standard Tag Library 1.0 (Jakarta Taglibs-Standard 1.0.3)
<li>Struts Framework
(Version 1.0) - MVC Framework for Web Applications</li>
<li>TO BE DETERMINED - Application for hosting SOAP
based web services</li>
</ul>
</subsection>
</section>
<section name="Functionality">
<subsection name="Properties of Administered Objects">
<p>Functional requirements for administrative applications are specified
in terms of <em>Administered Objects, whose definitions and detailed
properties are listed <a href="fs-admin-objects.html">here. In general,
Administered Objects correspond to components in the Catalina architecture,
but these objects are defined separately here for the following reasons:</p>
<ul>
<li>It is possible that the administrative applications do not expose
every possible configurable facet of the underlying components.</li>
<li>In some cases, an Administered Object (from the perspective of an
administrative operation) is realized by more than one Catalina
component, at a finer-grained level of detail.</li>
<li>It is necessary to represent the configuration information for a
component separately from the component itself (for instance, in
order to store that configuration information for later use).</li>
<li>It is necessary to represent configuration information (such as
a Default Context) when there is no corresponding component instance.
</li>
<li>Administered Objects, when realized as Java classes, will include
methods for administrative operations that have no correspondence
to operations performed by the corresponding actual components.</li>
</ul>
<p>It is assumed that the reader is familiar with the overall component
architecture of Catalina. For further information, see the corresponding
Developer Documentation. To distinguish names that are used as both
<em>Administered Objects and
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