The Advertisement Package

This digital djinni housed within the advertisement package consists of two constituents. The first is the interface GATInterface_IAdvertisable and the second, the class GATAdvertService. The interface is the keys and the class the djinni. Let me explain...

The interface GATInterface_IAdvertisable is an interface which is implemented by many classes within the GAT universe. In fact the full spectrum of such classes is shown in figure .

An instance of any class which implements this interface GATInterface_IAdvertisable can be placed in an GATAdvertService instance along with a description describing the advertisable. After this donation to the GATAdvertService djinni, whenever a user wants to find this deposited instance all they need do is give the djinni GATAdvertService a description of the instance they desire and this djnni will return a list of all the advertisables which fit this description. Magic, no? Furthermore, this GATAdvertService persists these advertisables and is accessible across machine boundaries. So, code on machine A can place an advertisable in a GATAdvertService on Tuesday, then next month code on machine B can remove or examine this same advertisable. Now that's really magic.

• Constructing and Destroying AdvertService Instances
• Adding Advertisables to an AdvertService
• Deleting Advertisables from an AdvertService
• Obtaining the Description of an Advertisable
• Finding Advertisables
• Getting or Deleting an Advertisable
• Setting and Getting the Working Directory