public
    void registerInterestIn( Class<? extends Data>... someInterestedData ) {
        //iterate over the array of data types 
        for( int i = 0; i < someInterestedData.length; ++i ) {
            //and add them to the interest list
            _interestedDataList.add( someInterestedData[i] );
        }
        //if there are actually things to be interested in,
        //tell the DataCenter to update the interest
        if( ! _interestedDataList.isEmpty() ) {
            //
            _dataCenter.updateProcessorInterest( _id );
        }
    }