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| <a href="index.html" title="back to Core Developers Guide"><< back to Core Developers Guide</a> |
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| <h1 id="big-picture">Big Picture</h1> |
| |
| <p>The diagram describes the frameworkâs architecture.</p> |
| |
| <p><img src="attachments/Struts2-Architecture.png" alt="Struts2-Architecture.png" /></p> |
| |
| <p>In the diagram, an initial request goes to the Servlet container (such as Jetty or Resin) which is passed through |
| a standard filter chain. The chain includes the (optional) <strong>ActionContextCleanUp</strong> filter, which is useful when |
| integrating technologies such as <em>SiteMesh Plugin</em> . Next, the required <strong>FilterDispatcher</strong> is called, which in turn |
| consults the <a href="action-mapper">ActionMapper</a> to determine if the request should invoke an action.</p> |
| |
| <p>If the ActionMapper determines that an Action should be invoked, the FilterDispatcher delegates control |
| to the <strong>ActionProxy</strong>. The ActionProxy consults the framework <a href="configuration-files">Configuration Files</a> manager |
| (initialized from the <a href="struts-xml">struts.xml</a> file). Next, the ActionProxy creates an <strong>ActionInvocation</strong>, which is |
| responsible for the command pattern implementation. This includes invoking any <strong>Interceptors</strong> (the <a href="before-annotation">before</a> |
| clause) in advance of invoking the <strong>Action</strong> itself.</p> |
| |
| <p>Once the Action returns, the ActionInvocation is responsible for looking up the proper <strong>result</strong> associated |
| with the <strong>Action result code</strong> mapped in <code class="language-plaintext highlighter-rouge">struts.xml</code>.</p> |
| |
| <p>The result is then executed, which often (but not always, as is the case for <a href="action-chaining">Action Chaining</a>) |
| involves a template written in <a href="../tag-developers/jsp">JSP</a> or <a href="../tag-developers/freemarker">FreeMarker</a> to be rendered. |
| While rendering, the templates can use the <a href="../tag-developers/struts-tags">Struts Tags</a> provided by the framework. |
| Some of those components will work with the ActionMapper to render proper URLs for additional requests.</p> |
| |
| <blockquote> |
| <p>All objects in this architecture (Actions, <a href="result-types">Results</a>, <a href="interceptors">Interceptors</a>, and so forth) are |
| created by an <a href="object-factory">ObjectFactory</a>. This ObjectFactory is pluggable. We can provide our own ObjectFactory |
| for any reason that requires knowing when objects in the framework are created. A popular ObjectFactory implementation |
| uses Spring as provided by the <a href="../plugins/">Spring Plugin</a>.</p> |
| </blockquote> |
| |
| <p>Interceptors are executed again (in reverse order, calling the <a href="after-annotation">after</a> clause). Finally, the response |
| returns through the filters configured in the web.xml.</p> |
| |
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