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Updated on: 1/11/07 8:52:40 AM
Updated by: Carsten Ziegeler
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--- <h1>The Cocoon Spring Configurator</h1>
---
--- <p>The Spring Configurator is a useful component providing support in common
--- configuration issues when using the Spring framework. Although this product
has
--- been developed inside the Cocoon project, it is aimed at making easier the
usage
--- of Spring in each and every web application; it is not tied to the famous
Cocoon
--- web application framework and can be used standalone. The impact on your
code is
--- nearly zero and the Spring Configurator as only Spring itself as a
dependency.
--- </p>
---
--- <h2>Motivation</h2>
---
--- <p>When using a framework like Spring there are always the same problems to
--- solve, like</p>
---
--- <ul>
--- <li>Where do I store my bean configurations?</li>
--- <li>How can I parameterize them dynamically?</li>
--- <li>Where do I store these extra information?</li>
--- <li>How can I handle different environments like a testing environment, a
--- development environment and a production environment?</li>
--- <li>How can I distribute not only code but also corresponding
configurations?
--- </li>
--- <li>How can I distribute partial web applications?</li>
--- <li>How do I manage hierarchial web application contexts?</li>
--- </ul>
---
--- <p>Of course Spring is flexible enough to enable solutions to the above
--- problems, but you have to do it and implement it for your solution. And
there is
--- more than one way of doing this and each and every project ends up
developing
--- its own "proprietary" solution. A best practice and a standardized way of
doing
--- these things would be great. And guess what, the Spring Configurator is the
--- answer to your problems. Like Maven has standardized the build process, the
--- Spring Configurator standardizes the way of dealing with various
configuration
--- issues with Spring. Ok, enough motivation, let's see what the Spring
--- configurator can provide for your work.</p>
---
--- <h2>Requirements</h2>
---
--- <p>The Spring Configurator requires</p>
---
--- <ul>
--- <li>the Spring Framework Version 2.0.1 (or above)</li>
--- <li>JDK 1.4 (or above)</li>
--- <li>Servlet API 2.3 (or above)</li>
--- </ul>
---
--- <p>The Spring Configuration requires two additional jar files, the Cocoon
--- Configuration API and the Cocoon Spring Configurator, which you can either
--- download here or from a public Maven repository by adding the Spring
--- Configurator as a dependency to your project:</p>
---
--- <p><strong>TODO - Show dependency configuration</strong></p>
---
--- <h2>Configuration</h2>
---
--- <p>The Spring Configurator uses the Spring the
--- <a
href="http://static.springframework.org/spring/docs/2.0.x/reference/new-in-2.html#new-in-2-ioc-custom-configuration";>extensible
--- XML authoring features</a> and therefore it can be directly used in your
Spring
--- bean configurations. Usually you add the configurator to your global web
--- application context configuration (which is usually located at
--- <em>/WEB-INF/applicationContext.xml</em>). The extensible XML authoring
requires
--- that you use the schema based configuration for Spring. Just add the
required
--- namespace definition, a reference to the configurator XML schema to your
bean
--- configuration:</p>
---
--- <pre><beans xmlns="http://www.springframework.org/schema/beans";
--- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
---
<strong>xmlns:configurator="http://cocoon.apache.org/schame/configurator";</strong>
--- xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
---
<strong>http://cocoon.apache.org/schema/configurator
http://cocoon.apache.org/schema/configurator/cocoon-configurator-1.0.xsd";</strong>>
--- ...
--- </beans>
--- </pre>
---
--- <p>Then you can initialize the configurator by adding the <tt>settings</tt>
--- element to your bean configuration:</p>
---
--- <pre> <!-- Activate Cocoon Spring Configurator -->
--- <configurator:settings/>
--- </pre>
---
--- <p>And then...</p>
---
--- <h2>Running Modes</h2>
---
--- <p>The configurator provides the support of <em>running modes</em>. A
running
--- mode defines the environment the application is currently running in. For
--- example this can be during development, a test setup or production. As you
will
--- see in just some paragraphs, the configurator can use different
configurations
--- and settings depending on the running mode.</p>
---
--- <p>A running mode is just a unique text key, like <tt>dev</tt>,
<tt>test</tt>
--- or <tt>prod</tt>. This key is used to determine the correct configuration at
--- runtime. Although you can use any text key, it is advisable to use one of
the
--- standard keys (dev, test or prod).</p>
---
--- <p>The running mode can be set in two ways: you can either set it in your
--- <tt>applicationContext.xml</tt> as a configuration for the <tt>settings
--- </tt>element:</p>
---
--- <pre> <!-- Activate Cocoon Spring Configurator -->
--- <configurator:settings runningMode="test"/>
--- </pre>
---
--- <p>Or you can define the running mode by setting the system property
--- <tt>org.apache.cocoon.mode</tt> on startup of your web application, usually
you
--- do this by specifying <tt>-Dorg.apache.cocoon.mode=test</tt> when starting
your
--- application server. The system property has precedence over the value from
the
--- application context. The default running mode is <tt>prod</tt>.</p>
---
--- <h2>Property Configurations</h2>
---
<p>For using properties in your configuration files, Spring provides the
<a
href="http://static.springframework.org/spring/docs/2.0.x/reference/beans.html#beans-factory-placeholderconfigurer";>property
placeholder configurer</a> which you have to configure in your application
(79 equal lines skipped)
implementation.</li>
</ul>
--- <h2>Configuring Log4j</h2>
---
--- <p>You can use the Configurator to
--- configure <a href="http://logging.apache.org/log4j/";>Log4j</a> through an
XML
--- configuration file:</p>
---
--- <pre> <bean name="org.apache.cocoon.spring.configurator.log4j"
---
class="org.apache.cocoon.spring.configurator.log4j.Log4JConfigurator"
--- scope="singleton">
--- <property name="resource" value="/WEB-INF/cocoon/log4j.xconf"/>
--- </bean>
--- </pre>
---
--- <p>The property <tt>resource</tt> should point to a valid Log4j XML
--- configuration file. You can use all properties configured through the
--- Configurator in the XML configuration and reference the actual values.</p>
---
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