struts 2: implement PreResultListener

[Jonathan Su]

I am trying to have a interceptor called after the Action is executed.

In struts.xml I have

<interceptors>
<interceptor name="accessControl" class="org.kp.pharmacy.sdp.web.interceptor.MemberInquiryAccessControlInterceptor"/>
</interceptors>

<action name="launch" class="org.kp.pharmacy.sdp.web.action.MemberInquiryAction" >
<interceptor-ref name="defaultStack"/>
<interceptor-ref name="accessControl"/>
<result name="success">jsp/MemberInquiry.jsp</result>
<result name="error">jsp/error.jsp</result>
</action>

The the interceptor is like this:
public class MemberInquiryAccessControlInterceptor implements PreResultListener{

public void beforeResult(ActionInvocation invocation, String result) {
MemberInquiryAction action = (MemberInquiryAction)invocation.getAction();
if (action.getMrnNumber() == null || action.getRegionCode() == null || action.isMultipleMember()) {
action.setMemberInquiryAccess(new MemberInquiryAccessBean());
action.getMemberInquiryAccess().setReadOnlyMode();
}
else {
action.setMemberInquiryAccess(new MemberInquiryAccessBean());
action.getMemberInquiryAccess().setEditMode();
}
return;
}
}

However this interceptor doesn't get called after the action. Could anybody tell me what I am missing?

Thanks,

[Dmitriy Kuznetsov]

It seems, that MemberInquiryAccessControlInterceptor must implement Interceptor(instead of PreResultListener) to be invoked.

And i couldn't find a way to attach PreResultListener to action through struts.xml directly. So, the thing is to implement Interceptor, which attaches PreResultListener to ActionInvocation. E.g:

http://struts.apache.org/2.x/docs/can-we-access-an-actions-result.html

public class MyInterceptor implements Interceptor {

  public String intercept(ActionInvocation invocation) throws Exception {

    invocation.addPreResultListener(new PreResultListener() {

      public void beforeResult(ActionInvocation invocation, String resultCode) {

           // do something after ActionSupport.execute() but before StrutsResultSupport.doExceute(...)
           // e.g. when action's execute() returned "input", turn it into "error" and enjoy <result name="error">jsp/error.jsp</result> effect

           if(("input").equals(resultCode)){
             invocation.setResultCode("error");
           }
        }
    });
    return invocation.invoke();
  }
}