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<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!DOCTYPE document [
<!ENTITY project SYSTEM "project.xml">
]>
<document url="globalresources.html">
&project;
<properties>
<title>The GlobalNamingResources Component</title>
</properties>
<body>
<section name="Table of Contents">
<toc/>
</section>
<section name="Introduction">
<p>The <strong>GlobalNamingResources</strong> element defines the global
JNDI resources for the <a href="server.html">Server</a>.</p>
<p>These resources are listed in the server's global JNDI resource context.
This context is distinct from the per-web-application JNDI contexts
described in
the <a href="../jndi-resources-howto.html">JNDI Resources How-To</a>.
The resources defined in this element are <strong>not</strong> visible in
the per-web-application contexts unless you explicitly link them with
<a href="context.html#Resource_Links"><ResourceLink></a> elements.
</p>
</section>
<section name="Attributes">
</section>
<section name="Nested Components">
</section>
<section name="Special Features">
<subsection name="Environment Entries">
<p>You can configure named values that will be made visible to all
web applications as environment entry resources by nesting
<code><Environment></code> entries inside this element. For
example, you can create an environment entry like this:</p>
<source><![CDATA[<GlobalNamingResources ...>
...
<Environment name="maxExemptions" value="10"
type="java.lang.Integer" override="false"/>
...
</GlobalNamingResources>]]></source>
<p>This is equivalent to the inclusion of the following element in the
web application deployment descriptor (<code>/WEB-INF/web.xml</code>):
</p>
<source><![CDATA[<env-entry>
<env-entry-name>maxExemptions</env-entry-name>
<env-entry-value>10</env-entry-value>
<env-entry-type>java.lang.Integer</env-entry-type>
</env-entry>]]></source>
<p>but does <em>not</em> require modification of the deployment descriptor
to customize this value.</p>
<p>The valid attributes for an <code><Environment></code> element
are as follows:</p>
<attributes>
<attribute name="description" required="false">
<p>Optional, human-readable description of this environment entry.</p>
</attribute>
<attribute name="name" required="true">
<p>The name of the environment entry to be created, relative to the
<code>java:comp/env</code> context.</p>
</attribute>
<attribute name="override" required="false">
<p>Set this to <code>false</code> if you do <strong>not</strong> want
an <code><env-entry></code> for the same environment entry name,
found in the web application deployment descriptor, to override the
value specified here. By default, overrides are allowed.</p>
</attribute>
<attribute name="type" required="true">
<p>The fully qualified Java class name expected by the web application
for this environment entry. Must be a legal value for
<code><env-entry-type></code> in the web application deployment
descriptor.</p>
</attribute>
<attribute name="value" required="true">
<p>The parameter value that will be presented to the application
when requested from the JNDI context. This value must be convertible
to the Java type defined by the <code>type</code> attribute.</p>
</attribute>
</attributes>
</subsection>
<subsection name="Resource Definitions">
<p>You can declare the characteristics of resources
to be returned for JNDI lookups of <code><resource-ref></code> and
<code><resource-env-ref></code> elements in the web application
deployment descriptor by defining them in this element and then linking
them with <a href="context.html#Resource_Links"><ResourceLink></a>
elements
in the <code><strong><Context></strong></code> element.
You <strong>MUST</strong> also define any other needed parameters using
attributes on the Resource element, to configure
the object factory to be used (if not known to Tomcat already), and
the properties used to configure that object factory.</p>
<p>For example, you can create a resource definition like this:</p>
<source><![CDATA[<GlobalNamingResources ...>
...
<Resource name="jdbc/EmployeeDB" auth="Container"
type="javax.sql.DataSource"
description="Employees Database for HR Applications"/>
...
</GlobalNamingResources>]]></source>
<p>This is equivalent to the inclusion of the following element in the
web application deployment descriptor (<code>/WEB-INF/web.xml</code>):</p>
<source><![CDATA[<resource-ref>
<description>Employees Database for HR Applications</description>
<res-ref-name>jdbc/EmployeeDB</res-ref-name>
<res-ref-type>javax.sql.DataSource</res-ref-type>
<res-auth>Container</res-auth>
</resource-ref>]]></source>
<p>but does <em>not</em> require modification of the deployment
descriptor to customize this value.</p>
<p>The valid attributes for a <code><Resource></code> element
are as follows:</p>
<attributes>
<attribute name="auth" required="false">
<p>Specify whether the web Application code signs on to the
corresponding resource manager programmatically, or whether the
Container will sign on to the resource manager on behalf of the
application. The value of this attribute must be
<code>Application</code> or <code>Container</code>. This
attribute is <strong>required</strong> if the web application
will use a <code><resource-ref></code> element in the web
application deployment descriptor, but is optional if the
application uses a <code><resource-env-ref></code> instead.</p>
</attribute>
<attribute name="closeMethod" required="false">
<p>Name of the zero-argument method to call on a singleton resource when
it is no longer required. This is intended to speed up clean-up of
resources that would otherwise happen as part of garbage collection.
This attribute is ignored if the <code>singleton</code> attribute is
false. If not specified, no default is defined and no close method will
be called.</p>
<p>For Apache Commons DBCP 2 and Apache Tomcat JDBC connection pools
you can use <code>closeMethod="close"</code>. Note that Apache Commons
DBCP 2 requires this to be set for a clean shutdown. When using the
default Tomcat connection pool (based on DBCP 2) Tomcat will set this
attribute automatically unless it is explicitly set to the empty
string.</p>
</attribute>
<attribute name="description" required="false">
<p>Optional, human-readable description of this resource.</p>
</attribute>
<attribute name="name" required="true">
<p>The name of the resource to be created, relative to the
<code>java:comp/env</code> context.</p>
</attribute>
<attribute name="scope" required="false">
<p>Specify whether connections obtained through this resource
manager can be shared. The value of this attribute must be
<code>Shareable</code> or <code>Unshareable</code>. By default,
connections are assumed to be shareable.</p>
</attribute>
<attribute name="singleton" required="false">
<p>Specify whether this resource definition is for a singleton resource,
i.e. one where there is only a single instance of the resource. If this
attribute is <code>true</code>, multiple JNDI lookups for this resource
will return the same object. If this attribute is <code>false</code>,
multiple JNDI lookups for this resource will return different objects.
This attribute must be <code>true</code> for
<code>javax.sql.DataSource</code> resources to enable JMX registration
of the DataSource. The value of this attribute must be <code>true</code>
or <code>false</code>. By default, this attribute is <code>true</code>.
</p>
</attribute>
<attribute name="type" required="true">
<p>The fully qualified Java class name expected by the web
application when it performs a lookup for this resource.</p>
</attribute>
</attributes>
</subsection>
<subsection name="Resource Links">
<p>Use <a href="context.html#Resource_Links"><code><ResourceLink></code></a>
elements to link resources from the global context into
per-web-application contexts. Here is an example of making a custom
factory available to an application, based on the example definition in the
<a href="../jndi-resources-howto.html#Generic_JavaBean_Resources">
JNDI Resource How-To</a>:
</p>
<source><![CDATA[<Context>
<ResourceLink
name="bean/MyBeanFactory"
global="bean/MyBeanFactory"
type="com.mycompany.MyBean"
/>
</Context>]]></source>
</subsection>
<subsection name="Transaction">
<p>You can declare the characteristics of the UserTransaction
to be returned for JNDI lookup for <code>java:comp/UserTransaction</code>.
You <strong>MUST</strong> define an object factory class to instantiate
this object as well as the needed resource parameters as attributes of the
<code>Transaction</code>
element, and the properties used to configure that object factory.</p>
<p>The valid attributes for the <code><Transaction></code> element
are as follows:</p>
<attributes>
<attribute name="factory" required="true">
<p>The class name for the JNDI object factory.</p>
</attribute>
</attributes>
</subsection>
</section>
</body>
</document>
|
