The translational layers are trusted software component which run inside the client machine. They cointain the server specific implementation that is required by the DataGuard middleware.
A simple translational layer contain the implementation of five functions.
public int connect(String username, String password);
public int disconnect();
public int store(AbstractObjectData O);
public int fetch(AbstractObjectData O);
public int delete(AbstractObjectData O);
The functions connect and disconnect open and close a session with the Internet Data Provider. The funtction store(AbstractObjectData O) stores an object O at the server and the function fetch(AbstractObjectData O) retrieves the object from the server. The function delete(AbstractObjectData O) deletes the object O stored at the server.
The first translational layer has been built on top of a DB2 database.
Probably everybody has a Gmail account, or more than one. So, why don't use all the storage space offered by Gmail?. This layer built a secure network file system on top of Gmail. Using this layer you will transform your Gmail account into a secure file storage space.
Amazon S3 is a storage for the Internet. It provides a simple web services interface that can be used to store and retrieve any amount of data, at anytime, from anywhere on the web. Then, exactly what I need to build another secure network file system.