[Struts Wiki] Update of "StrutsAndSpring" by ndeloof

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The following page has been changed by ndeloof:
http://wiki.apache.org/struts/StrutsAndSpring

The comment on the change is:
  

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- === References ===
+ === Using Spring and Groovy to quick prototype actions ===
  
-  * Struts + Spring 2.0 + Groovy: http://forum.springframework.org/showthread.php?t=27534
+ Spring 2.0 adds support for scripted beans. This mean a script engine can be used to run a script that will look like a regular java class. 
  
+ Struts also support scripted actions, but this requires to change the struts config. This may be a good option, but not if you want your production web application to use compiled java classes, and just use scripting support for quick application prototyping.
+ 
+ Using Spring 2.0 scripted-beans, Groovy that can parse a 100% java source file and Struts allow to quickly change a "classic" java action into a scripted bean, and just hit refresh in the browser to see effects of a code change.
+ 
+ == How to ? ==
+ 
+   1. Create a simple interface that define the Struts action "execute" method:
+  
+ {{{
+ public interface StrutsAction
+ {
+     public abstract ActionForward execute(ActionMapping mapping,
+             ActionForm form, HttpServletRequest request,
+             HttpServletResponse response) throws Exception;
+ 
+ }
+ }}}
+ 
+   1. Create a SciptedBeanActionAdapter class :
+ 
+ {{{
+ public class SciptedBeanActionAdapter extends Action {
+     private StrutsAction delegate;
+     
+     public SciptedBeanActionAdapter(StrutsAction delegate) {
+         this.delegate = delegate;
+     }
+ 
+     public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
+         return delegate.execute(mapping, form, request, response);
+     }
+ }
+ }}}
+ 
+   1. Configure your web application to use this requestProcessor :
+ 
+ {{{
+ public class GroovyAutowiringTilesRequestProcessor extends AutowiringTilesRequestProcessor {
+ 
+     protected Action processActionCreate(HttpServletRequest request, HttpServletResponse response, ActionMapping mapping)
+         throws IOException {
+         WebApplicationContext wac = getWebApplicationContext();
+         String beanName = DelegatingActionUtils
+             .determineActionBeanName(mapping);
+         if (wac.containsBean(beanName)) {
+             StrutsAction bean = (StrutsAction) wac.getBean(beanName, StrutsAction.class);
+             return new SciptedBeanActionAdapter(bean);
+         }
+         return super.processActionCreate(request, response, mapping);
+     }       
+ }
+ }}}
+ 
+ This processor will look into spring context for a bean that implements StrutsAction and wich name is the action mapping path.
+ 
+   1. Add classpath*:localContext.xml to your spring web application context. This file will not be required at runtime, so there is no impact on the production application.
+ 
+   1. Put a localContext.xml file into your application server classpath. I myself created it in $TOMCAT/shared/classes. 
+ 
+   1. Add Groovy, asm and Spring-support jars in your web application libs
+ 
+ Your application is now ready for quick prototyping !
+ 
+ == Hot reload action's java code ==
+ 
+ Now, consider you have a FooAction mapped to "/foo.do" you want to edit quickly.
+ 
+   1. Make your action implement StrutsAction. You only have to add "implements StrutsAction" as your action allready extends struts Action and defines the execute method.
+ 
+   1. Edit your localContext.xml and add :
+ 
+ {{{
+   <alias name="groovyAction" alias="/foo"/>
+   <lang:groovy id="groovyAction"
+     script-source="file:D:/../src/java/.../FooAction.java"
+     refresh-check-delay="1">
+   </lang:groovy>
+ }}}
+ 
+ If you want to use dependency injection, simply add 
+ {{{
+     <lang:property name="property" ref="bean"/>
+ }}}
+ 
+   1. Start the app, go to your web page. 
+  
+   1. Change the code and simply hit refresh to see effects. No recompile, repackage, redeploy required !
+