question: public boolean write ( byte [ ] buffer , int offset , int length ) { if ( length == 0 ) { return true ; } int count = length / BLOCK_SIZE + 1 ; if ( _tailAddress <= _index + length + PAD + 2 * count ) { return false ; } _crc . update ( buffer , offset , length ) ; byte [ ] headerBuffer = _headerBuffer ; while ( length > 0 ) { int sublen = Math . min ( length , BLOCK_SIZE ) ; BitsUtil . writeInt16 ( headerBuffer , 0 , sublen ) ; writeImpl ( headerBuffer , 0 , 2 ) ; writeImpl ( buffer , offset , sublen ) ; length -= sublen ; offset += sublen ; } return true ; }
target:  Writes a partial journal entry. The entry will only be completed after completeWrite() has been called. The write will return false if the journal segment is full. The caller needs to retry the write with a new segment.