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Struts 2 Interceptors

I have a struts application where certain actions need a log entry made in a database. I figured the best way to accomplish this was an interface for my actions to implement, and an interceptor to do the logging.

So, here's my interface:

public interface LoggableAction
{
  public String getUser();
  public String getTransactionType();
  public String getValue();
}

Now, I have my actions implement this interface, and have my interceptor do:

public class OperatorHistoryInterceptor extends AbstractInterceptor
{
  public String intercept(ActionInvocation invocation) throws Exception
        {
            Object action = invocation.getAction();
            if (action instanceof LoggableAction)
            {
                    // Log to database
             }
             return invocation.invoke();
         }
}

Then, configure struts.xml to include this interceptor for all actions:
		<interceptors>
			<interceptor name="operatorHistory"
			 class="OperatorHistoryInterceptor" />
 
			<interceptor-stack name="validationWorkflowStack">
				<interceptor-ref name="prepare"/>
				<interceptor-ref name="basicStack"/>
				<interceptor-ref name="validation"/>
				<interceptor-ref name="operatorHistory"/>
				<interceptor-ref name="passwordExpired"/>
				<interceptor-ref name="workflow"/>
			</interceptor-stack>
		</interceptors>

That's it, just extend the interface with your actions, and off you go.