Quick introduction to AspectJ ITD

In this post, I'll show a few examples of AspectJ ITDs that are generated by Spring Roo and the declarations contained in those ITDs. You'll find a more detailed discussion in Chapter 1 (which is available for download) of Spring Roo 1.1 Cookbook.

Example 1: FlightService_Roo_ToString.aj

package sample.roo.flightapp.service;

privileged aspect FlightService_Roo_ToString {

   

    public String FlightService.toString() {

        StringBuilder sb = new StringBuilder();

       sb.append("Origin: ")

         .append(getOrigin());

        return sb.toString();

    }

} 

The following figure shows what the above declaration implies:

Example 2: FlightService_Roo_Serializable.aj

package sample.roo.flightapp.service;

import java.io.Serializable;

privileged aspect FlightService_Roo_Serializable {

   

  declare parents: FlightService implements Serializable;

   

  private static final long FlightService.serialVersionUID

      = 5059552858884348572L

}

The following figure shows what the above declaration implies: