protected static class CompressionTransformerSpi extends CacheObjectTransformerSpiAdapter {
    private static final LZ4Factory lz4Factory = LZ4Factory.fastestInstance();

    protected ByteBuffer transform(ByteBuffer original) throws IgniteCheckedException {
        int lim = original.remaining() - CacheObjectTransformerSpi.OVERHEAD;

        if (lim <= 0)
            throw new IgniteCheckedException("Compression is not profitable.");

        ByteBuffer compressed = byteBuffer(lim);

        Zstd.compress(compressed, original, 1);

        compressed.flip();             

        return compressed;
    }

    protected ByteBuffer restore(ByteBuffer transformed, int length) {
        ByteBuffer restored = byteBuffer(length);

        Zstd.decompress(restored, transformed);

        restored.flip();
              
        return restored;
    }
}

class EncryptionTransformerSpi extends CacheObjectTransformerSpiAdapter {
    private static final int SHIFT = 42; // Secret!

    protected ByteBuffer transform(ByteBuffer original) throws IgniteCheckedException {
        ByteBuffer transformed = byteBuffer(original.remaining()); // Same capacity is required.

        while (original.hasRemaining())
            transformed.put((byte)(original.get() + SHIFT));

        transformed.flip();

        return transformed;
    }

    protected ByteBuffer restore(ByteBuffer transformed, int length) {
        ByteBuffer restored = byteBuffer(length);

        while (transformed.hasRemaining())
            restored.put((byte)(transformed.get() - SHIFT));

        restored.flip();

        return restored;
    }
}