ByteBufChecksumTest Class — netty Architecture

Source Code

codec-compression/src/test/java/io/netty/handler/codec/compression/ByteBufChecksumTest.java lines 32–90

public class ByteBufChecksumTest {

    private static final byte[] BYTE_ARRAY = new byte[1024];

    @BeforeAll
    public static void setUp() {
        new Random().nextBytes(BYTE_ARRAY);
    }

    @Test
    public void testHeapByteBufUpdate() {
        testUpdate(Unpooled.wrappedBuffer(BYTE_ARRAY));
    }

    @Test
    public void testDirectByteBufUpdate() {
        ByteBuf buf = Unpooled.directBuffer(BYTE_ARRAY.length);
        buf.writeBytes(BYTE_ARRAY);
        testUpdate(buf);
    }

    private static void testUpdate(ByteBuf buf) {
        try {
            // all variations of xxHash32: slow and naive, optimised, wrapped optimised;
            // the last two should be literally identical, but it's best to guard against
            // an accidental regression in ByteBufChecksum#wrapChecksum(Checksum)
            testUpdate(xxHash32(DEFAULT_SEED), ByteBufChecksum.wrapChecksum(xxHash32(DEFAULT_SEED)), buf);
            testUpdate(xxHash32(DEFAULT_SEED), new Lz4XXHash32(DEFAULT_SEED), buf);
            testUpdate(xxHash32(DEFAULT_SEED), ByteBufChecksum.wrapChecksum(new Lz4XXHash32(DEFAULT_SEED)), buf);

            // CRC32 and Adler32, special-cased to use ReflectiveByteBufChecksum
            testUpdate(new CRC32(), ByteBufChecksum.wrapChecksum(new CRC32()), buf);
            testUpdate(new Adler32(), ByteBufChecksum.wrapChecksum(new Adler32()), buf);
        } finally {
            buf.release();
        }
    }

    private static void testUpdate(Checksum checksum, ByteBufChecksum wrapped, ByteBuf buf) {
        testUpdate(checksum, wrapped, buf, 0, BYTE_ARRAY.length);
        testUpdate(checksum, wrapped, buf, 0, BYTE_ARRAY.length - 1);
        testUpdate(checksum, wrapped, buf, 1, BYTE_ARRAY.length - 1);
        testUpdate(checksum, wrapped, buf, 1, BYTE_ARRAY.length - 2);
    }

    private static void testUpdate(Checksum checksum, ByteBufChecksum wrapped, ByteBuf buf, int off, int len) {
        checksum.reset();
        wrapped.reset();

        checksum.update(BYTE_ARRAY, off, len);
        wrapped.update(buf, off, len);

        assertEquals(checksum.getValue(), wrapped.getValue());
    }

    private static Checksum xxHash32(int seed) {
        return XXHashFactory.fastestInstance().newStreamingHash32(seed).asChecksum();
    }
}