public long readRawLittleEndian64() throws IOException {
        int position = nioBuffer.position();
        long result = UnsafeDirectBufferUtil.getLongLE(address(position));
        nioBuffer.position(position + 8);
        return result;
    }
Read a 64-bit little-endian integer from the internal byte buffer.
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/serialization/impl/protostuff/io/UnsafeNioBufInput.java