boolean beginRecord() throws IOException, DurableDataLogException {
        try {
            if (this.currentEntry != null && !this.prefetchedEntry) {
                endRecord();
            }

            fetchNextEntry();
            return true;
        } catch (NoMoreRecordsException ex) {
            // We've reached the end of the DataFrameInputStream. We are done.
            return false;
        }
    }
boolean beginRecord ( ) throws IOException , DurableDataLogException { try { if ( this . currentEntry != null && ! this . prefetchedEntry ) { endRecord ( ) ; } fetchNextEntry ( ) ; return true ; } catch ( NoMoreRecordsException ex ) { return false ; } }
Indicates that a new record is to be expected. When invoked, if in the middle of a record, it will be skipped over
and the DataFrameInputStream will be positioned at the beginning of the next record.

@return True if a new record can be read, false if we reached the end of the DataFrameInputStream and can no longer
read.
@throws IOException If an IO Exception occurred.
@throws DurableDataLogException If a non-IO Exception has occurred, usually thrown by the underlying DurableDataLog.