A PreResultListener can affect an action invocation between the interceptor/action phase and the result phase. Typical uses include switching to a different Result or somehow modifying the Result or Action objects before the Result executes.
Examples
A PreResultListener can be added by an Action or an Interceptor.
By an Action
public class MyAction extends ActionSupport {
...
public String execute() throws Exception {
ActionInvocation invocation = ActionContext.getContext().getActionInvocation();
invocation.addPreResultListener(new PreResultListener() {
public void beforeResult(ActionInvocation invocation,
String resultCode) {
// perform operation necessary before Result execution
}
});
}
...
}
By an Interceptor
public class MyInterceptor extends AbstractInterceptor {
...
public String intercept(ActionInvocation invocation) throws Exception {
invocation.addPreResultListener(new PreResultListener() {
public void beforeResult(ActionInvocation invocation,
String resultCode) {
// perform operation necessary before Result execution
}
});
}
...
}