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Apache Struts 2 Documentation
Action Proxy & ActionProxy Factory
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Added by tm_jee, last edited by Ted Husted on Feb 12, 2007 (view change)

The ActionProxy obtains the Action class and calls the appropriate method. By default, Actions are obtained through local instantiation, but an Action could also be obtained remotely if an alternative ActionProxy were provided.

An alternative ActionProxy can be configured thorugh ActionProxyFactory. Typically, an ActionProxy will utilize the ActionInvocation to encapsulate the execution of a particular requiest.

The ActionInvocation determines how an Action is handled: Is it being intercepted, is there a PreResultListener acting on it.

Essentially, ActionProxy encapsulates how an Action can be obtained. ActionInvocation encapsulates how the Action is executed when a request is invoked.

## Customization

### ActionProxyFactory

    ActionProxyFactory.setFactory(new MyActionProxyFactory() {
        .....
     });

### ActionProxy

    ActionProxyFactory.getFactory(new MyActionProxyFactory() {
        ....
        public ActionProxy createActionProxy(Configuration config,
               String namespace, String actionName, Map extraContext)
               throws Exception {
            createActionProxy(config, namespace, actionName, extraContext, true);
        }
        public ActionProxy createActionProxy(Configuration config,
               String namespace, String actionName, Map extraContext,
               boolean executeResult, boolean cleanupContext)
               throws Exception {
            ....
       }
       ....
     });

### ActionInvocation

    ActionProxyFactory.getFactory(new MyActionProxyFactory() {
        ...
        public ActionInvocation createActionInvocation(ActionProxy actionProxy)
                                throws Exception {
              createActionInvocation(actionProxy, new LinkedHashMap());
        }
        public ActionInvocation createActionInvocation(ActionProxy actionProxy,
                                Map extraContext) throws Exception {
              createActionInvocation(actionProxy, extraContext, true);
        }
        public ActionInvocation createActionInvocation(ActionProxy actionProxy,
                                Map extraContext, boolean pushAction)
                                throws Exception {
              // do implementation of ActionInvocation herer
              .....
        }
        ...
     });

## Next: Configuration Provider & Configuration