module musicServer {
    exception NoSuchUserException { string reason; };
    exception UserIDExistsException { string reason; };
    enum MediaType { CD, TAPE, RECORD, NOT_SPECIFIED };

    interface AlbumI {
        attribute string      sArtistName;
        attribute string      sAlbumName;
        attribute string      sListeningNotes;
        attribute float       fPrice;

        attribute MediaType   type;
    };
    typedef sequence<AlbumI>AlbumSequence;

    struct AlbumQueryS {
        string      sArtistName;
        string      sAlbumName;
        float       fPrice;
        MediaType   type;
    };

    interface MusicCollectionI {
        attribute string sUserName;
        attribute string sPassword;

        AlbumSequence getAllAlbums();
        AlbumSequence getAllAlbumsByArtistName();
        AlbumSequence getAllAlbumsByAlbumName();
        void addAlbum(in AlbumI album);
        void deleteAlbum(in AlbumI album);
        AlbumI obtainEmptyAlbum();
    };

    interface RequestorI {
        void albumFound(in AlbumSequence album);
    };

    interface MusicServerI {
        MusicCollectionI obtainCollection(in string sUserName, 
                                          in string sPassword)
                                          raises(NoSuchUserException);

        MusicCollectionI createCollection(in string sUserName, 
                                          in string sPassword)
                                          raises(UserIDExistsException);

        void logOut(in MusicCollectionI collection);

        AlbumQueryS obtainEmptyQuery();

        void searchCatalog(in AlbumQueryS query, in RequestorI requestor);

        void saveCollection();
    };
};