com.esotericsoftware.kryo.Kryo Java Examples

@Test
public void testSerialize() throws Exception {
    final PSTree tree = new PSTree(1);
    tree.addNode(2, "n2", 1, 0, "none");
    tree.addNode(3, "n3", 1, 0, "none");
    tree.addNode(4, "n4", 2, 0, "none");

    try {
        final File tempFile = createTempFile("test", ".dat");
        final Kryo kryo = new Kryo();
        kryo.setReferences(false);
        Output output = new Output(new FileOutputStream(tempFile));
        kryo.writeObject(output, tree);
        output.close();

        final Input input = new Input(new FileInputStream(tempFile));
        final PSTree treeIn = kryo.readObject(input, PSTree.class);
        Assert.assertEquals(treeIn, tree);
    } catch (FileNotFoundException e) {
        throw new IOException("Error with Kryo IO", e);
    }
}
 

@Override
public byte[] serialize(Object entry) {
    if (entry == null) {
        return ArrayUtils.EMPTY_BYTE_ARRAY;
    }

    Kryo kryo = kryoPool.borrow();
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream(BUFFER_SIZE);
    Output output = new Output(outputStream);

    if (type == null) {
        kryo.writeClassAndObject(output, entry);
    } else {
        kryo.writeObject(output, entry);
    }
    kryoPool.release(kryo);
    output.flush();
    byte[] result = outputStream.toByteArray();
    output.close();
    return result;
}
 

/**
 * 序列化
 *
 * @param obj 需要序更列化的对象
 * @return 序列化后的byte 数组
 * @throws TransactionException
 */
@Override
public byte[] serialize(Object obj) throws TransactionException {
    byte[] bytes;
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    try {
        //获取kryo对象
        Kryo kryo = new Kryo();
        Output output = new Output(outputStream);
        kryo.writeObject(output, obj);
        bytes = output.toBytes();
        output.flush();
    } catch (Exception ex) {
        throw new TransactionException("kryo serialize error" + ex.getMessage());
    } finally {
        try {
            outputStream.flush();
            outputStream.close();
        } catch (IOException e) {

        }
    }
    return bytes;
}
 

@SuppressWarnings("unchecked")
@Override
public void readFields(final DataInput input) throws IOException {
    try {
        Kryo kryo = new Kryo();
        kryo.register(HBaseEdge.class, new HBaseEdgeSerializer());
        final ByteArrayInputStream bais = new ByteArrayInputStream(WritableUtils.readCompressedByteArray(input));
        this.edge = kryo.readObject(new Input(bais), HBaseEdge.class);
        Class<? extends Writable> cls = Class.forName(Text.readString(input)).asSubclass(Writable.class);
        Writable writable;
        if (cls.equals(NullWritable.class)) {
            writable = NullWritable.get();
        } else {
            writable = cls.newInstance();
        }
        writable.readFields(input);
        this.value = writable != NullWritable.get() ? (V) writable : null;
    } catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {
        throw new IOException("Failed writable init", e);
    }
}
 

/**
 * This method checkpoints the given operator.
 * @param oper The operator to checkpoint.
 * @param bos The ByteArrayOutputStream which saves the checkpoint data temporarily.
 * @return new operator.
 */
public static <T> T checkpoint(T oper, ByteArrayOutputStream bos) throws Exception
{
  Kryo kryo = new Kryo();

  Output loutput = new Output(bos);
  kryo.writeObject(loutput, oper);
  loutput.close();

  Input lInput = new Input(bos.toByteArray());
  @SuppressWarnings("unchecked")
  T checkPointedOper = kryo.readObject(lInput, (Class<T>)oper.getClass());
  lInput.close();

  return checkPointedOper;
}
 

@Override
public MapMetaData<Byte> read(Kryo kryo, Input input, Class<MapMetaData<Byte>> type) {
    try {
        thatMapMetaData = mapMetaData.recv(input);
        int thatMapSegNum = thatMapMetaData.getSegNum();
        List<Map<String, Byte>> mapDataList = new ArrayList<>(thatMapSegNum);
        thatMapMetaData.setMapDataList(mapDataList);

        for (int i = 0; i < thatMapSegNum; i++) {
            int dataNum = thatMapMetaData.getDataNum(i);
            Map<String, Byte> mapData = new HashMap<>(dataNum);
            mapDataList.add(mapData);
            for (int j = 0; j < dataNum; j++) {
                String key = input.readString();
                Byte val = input.readByte();
                mapData.put(key, val);
            }
        }
    } catch (IOException e) {
        LOG.error("double array read exception", e);
        System.exit(1);
    }
    return thatMapMetaData;
}
 

@Test
public void testKryoInChildClasspath() throws Exception {
	final Class<?> avroClass = AvroKryoSerializerUtils.class;

	final URL avroLocation = avroClass.getProtectionDomain().getCodeSource().getLocation();
	final URL kryoLocation = Kryo.class.getProtectionDomain().getCodeSource().getLocation();

	final ClassLoader parentClassLoader = new FilteredClassLoader(
			avroClass.getClassLoader(), AvroKryoSerializerUtils.class.getName());

	final ClassLoader userAppClassLoader = FlinkUserCodeClassLoaders.childFirst(
			new URL[] { avroLocation, kryoLocation },
			parentClassLoader,
			CoreOptions.ALWAYS_PARENT_FIRST_LOADER_PATTERNS.defaultValue().split(";"));

	final Class<?> userLoadedAvroClass = Class.forName(avroClass.getName(), false, userAppClassLoader);
	assertNotEquals(avroClass, userLoadedAvroClass);

	// call the 'addAvroGenericDataArrayRegistration(...)' method
	final Method m = userLoadedAvroClass.getMethod("addAvroGenericDataArrayRegistration", LinkedHashMap.class);

	final LinkedHashMap<String, ?> map = new LinkedHashMap<>();
	m.invoke(userLoadedAvroClass.newInstance(), map);

	assertEquals(1, map.size());
}
 

public void write(Kryo kryo, Output output, ArrayMetaData<short[]> object) {
    try {
        short[] arrData = arrayMetaData.getArrData();
        arrayMetaData.send(output);
        int arrSegNum = arrayMetaData.getSegNum();
        for (int i = 0; i < arrSegNum; i++) {
            int from = arrayMetaData.getFrom(i);
            int to = arrayMetaData.getTo(i);
            for (int j = from; j < to; j++) {
                output.writeShort(arrData[j]);
            }
        }
    } catch (IOException e) {
        LOG.error("double array write exception", e);
        System.exit(1);
    }
}
 

@Override
public BulkWriteResult read(Kryo kryo, Input input, Class<BulkWriteResult> type) {
		WriteResult globalStatus = kryo.readObject(input,WriteResult.class);
		int notRunSize = input.readInt();
		IntHashSet notRunRows = new IntHashSet(notRunSize);
		for(int i=0;i<notRunSize;i++){
				notRunRows.add(input.readInt());
		}
		int failedSize = input.readInt();
		IntObjectHashMap<WriteResult> failedRows = new IntObjectHashMap<>(failedSize,0.9f);
		for(int i=0;i<failedSize;i++){
				int k = input.readInt();
				WriteResult result = kryo.readObject(input,WriteResult.class);
				failedRows.put(k,result);
		}
		return new BulkWriteResult(globalStatus,notRunRows,failedRows);
}
 

/**
 * 根据所注册的Class，初始化Kryo实例
 * 
 * @return
 */
protected Kryo initKryo() {
	Kryo kryo = new Kryo();
	kryo.setReferences(true); 
	kryo.setRegistrationRequired(true); 
	kryo.setInstantiatorStrategy(new StdInstantiatorStrategy());
	Set<Class<?>> keys = propertyMap.keySet();
	for(Class<?> key : keys){
		if(propertyMap.get(key) != null){
			kryo.register(key, propertyMap.get(key));
		} else {
			kryo.register(key);
		}
	}
	
	return kryo;
}
 

public static void main(String[] args) {
    Kryo kryo = new Kryo();

    // 序列化
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    Output output = new Output(os);
    TestUser user = new TestUser();
    kryo.writeObject(output, user);
    output.close();
    byte[] bytes = os.toByteArray();

    // 反序列化
    Input input = new Input(new ByteArrayInputStream(bytes));
    user = kryo.readObject(input, TestUser.class);
    input.close();

}
 

KryoHolder(Kryo kryo) {
            this.kryo = kryo;

            //   register
            this.kryo.register(Arrays.asList("").getClass(), new ArraysAsListSerializer());
            this.kryo.register(Collections.EMPTY_LIST.getClass(), new CollectionsEmptyListSerializer());
            this.kryo.register(Collections.EMPTY_MAP.getClass(), new CollectionsEmptyMapSerializer());
            this.kryo.register(Collections.EMPTY_SET.getClass(), new CollectionsEmptySetSerializer());
            this.kryo.register(Collections.singletonList("").getClass(), new CollectionsSingletonListSerializer());
            this.kryo.register(Collections.singleton("").getClass(), new CollectionsSingletonSetSerializer());
            this.kryo.register(Collections.singletonMap("", "").getClass(), new CollectionsSingletonMapSerializer());
            this.kryo.register(GregorianCalendar.class, new GregorianCalendarSerializer());
            this.kryo.register(InvocationHandler.class, new JdkProxySerializer());
            // register CGLibProxySerializer, works in combination with the appropriate action in handleUnregisteredClass (see below)
            this.kryo.register(CGLibProxySerializer.CGLibProxyMarker.class, new CGLibProxySerializer());
            UnmodifiableCollectionsSerializer.registerSerializers(this.kryo);
            SynchronizedCollectionsSerializer.registerSerializers(this.kryo);

            //其他第三方
//        // joda datetime
//        kryo.register(DateTime.class, new JodaDateTimeSerializer());
//        // wicket
//        kryo.register(MiniMap.class, new MiniMapSerializer());
//        // guava ImmutableList
//        ImmutableListSerializer.registerSerializers(kryo);
        }
 

/**
 * Ensure that the ProfilePeriod can undergo Kryo serialization which
 * occurs when the Profiler is running in Storm.
 */
@Test
public void testKryoSerialization() {
  ProfilePeriod expected = ProfilePeriod.fromTimestamp(AUG2016, 1, TimeUnit.HOURS);
  Kryo kryo = new Kryo();

  // serialize
  ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
  Output output = new Output(byteStream);
  kryo.writeObject(output, expected);

  // validate serialization
  byte[] bits = output.toBytes();
  assertNotNull(bits);

  // deserialize
  Input input = new Input(new ByteArrayInputStream(bits));
  ProfilePeriod actual = kryo.readObject(input, ProfilePeriod.class);

  // validate deserialization
  assertNotNull(actual);
  assertEquals(expected, actual);
}
 

/**
 * Reads a read-metadata from a file or resource.
 * @param whereFrom the file or resource containing the read-metadata.
 * @throws IllegalArgumentException if {@code whereFrom} is {@code null}.
 * @throws UserException if any problem occurred where deserializing.
 * @return never {@code null}.
 */
public static ReadMetadata readStandalone(final String whereFrom) {
    try (final InputStream inputStream = BucketUtils.openFile(whereFrom);
         final Input input = new Input(inputStream)) {
        final Kryo kryo = new Kryo();
        final Serializer serializer = new Serializer();
        final String magicString = input.readString();
        if (!Objects.equals(MAGIC_STRING, magicString)) {
            throw new UserException.BadInput("Bad file format in " + whereFrom +
                    "; it does not seem to be a valid read-metadata serialization");
        }
        final String versionString = input.readString();
        if (!Objects.equals(VERSION_STRING, versionString)) {
            throw new UserException.BadInput("Bad file format in " + whereFrom +
                    "; it contains an incompatible version " + versionString + "(expected: " + VERSION_STRING + ")");
        }
        final ReadMetadata result = serializer.read(kryo, input, ReadMetadata.class);
        if (result == null) {
            throw new UserException.BadInput("Missing read-metadata in " + whereFrom);
        }
        return result;

    } catch (final Exception ex) {
        throw new UserException.CouldNotCreateOutputFile(whereFrom, ex);
    }
}
 

/**
 * Creates a Kryo serializer and writes the default registrations out to a
 * comma separated file with one entry per line:
 *
 * <pre>
 * id,class
 * </pre>
 *
 * <p>The produced file is used to check that the registered IDs don't change
 * in future Flink versions.
 *
 * <p>This method is not used in the tests, but documents how the test file
 * has been created and can be used to re-create it if needed.
 *
 * @param filePath File path to write registrations to
 */
private void writeDefaultKryoRegistrations(String filePath) throws IOException {
	final File file = new File(filePath);
	if (file.exists()) {
		assertTrue(file.delete());
	}

	final Kryo kryo = new KryoSerializer<>(Integer.class, new ExecutionConfig()).getKryo();
	final int nextId = kryo.getNextRegistrationId();

	try (BufferedWriter writer = new BufferedWriter(new FileWriter(file))) {
		for (int i = 0; i < nextId; i++) {
			Registration registration = kryo.getRegistration(i);
			String str = registration.getId() + "," + registration.getType().getName();
			writer.write(str, 0, str.length());
			writer.newLine();
		}

		System.out.println("Created file with registrations at " + file.getAbsolutePath());
	}
}
 

@Override
public Interpolation.BounceIn copy(Kryo kryo, Interpolation.BounceIn original) {
	try {
		float[] widths = (float[]) fieldW.get(original);
		return new Interpolation.BounceIn(widths.length);
	} catch (IllegalAccessException e) {
		throw new RuntimeException(e);
	}
}
 

static public void register (EndPoint endPoint) {
	Kryo kryo = endPoint.getKryo();
	kryo.register(Login.class);
	kryo.register(RegistrationRequired.class);
	kryo.register(Register.class);
	kryo.register(AddCharacter.class);
	kryo.register(UpdateCharacter.class);
	kryo.register(RemoveCharacter.class);
	kryo.register(Character.class);
	kryo.register(MoveCharacter.class);
}
 

@Override
public List<T> read(Kryo kryo, Input input, Class<List<T>> type) {
    int size = input.readInt();
    List<T> list = new ArrayList<T>(size);
    for (int i = 0; i < size; i++) {
        list.add(valSerializer.read(kryo, input, this.valType));
    }
    return list;
}
 

@Override
public void write(Kryo kryo, Output output, Interpolation.Elastic object) {
	output.writeFloat(object.value);
	output.writeFloat(object.power);
	output.writeFloat(abs(object.scale / MathUtils.PI));
	output.writeFloat(object.bounces);
}
 

private final void checkKryoInitialized() {
	if (this.kryo == null) {
		this.kryo = new Kryo();
		this.kryo.setAsmEnabled(true);
		this.kryo.register(typeClass);
	}
}
 

@Override
public void write(Kryo kryo, Output output, Object object) {
  ByteArrayOutputStream bos = new ByteArrayOutputStream();
  try {
    ObjectOutputStream oos = new ObjectOutputStream(bos);
    oos.writeObject(object);
    oos.flush();
  } catch (IOException e) {
    throw new RuntimeException(e);
  }
  byte[] ser = bos.toByteArray();
  output.writeInt(ser.length);
  output.writeBytes(ser);
}
 

@Override
public AbstractUserAgentAnalyzerDirect read(Kryo kryo, Input input, Class<AbstractUserAgentAnalyzerDirect> type) {
    AbstractUserAgentAnalyzerDirect uaa = super.read(kryo, input, type);
    uaa.initTransientFields();
    uaa.showDeserializationStats();
    return uaa;
}
 

@Override
public byte[] serialize(final Object obj) throws SerializationException {
	LOGGER.info("Serializing object of type " + obj.getClass().getName()
			+ " to byte[]");
	final Kryo kryo = new Kryo();
	final ByteArrayOutputStream st = new ByteArrayOutputStream();
	final Output output = new Output(st);
	kryo.writeClassAndObject(output, obj);
	output.close();
	return st.toByteArray();
}
 

public HBaseEdge read(Kryo kryo, Input input, Class<? extends HBaseEdge> type) {
    HBaseEdge edge = super.read(kryo, input, type);
    int outVBytesLen = input.readInt();
    Object outVId = ValueUtils.deserialize(input.readBytes(outVBytesLen));
    int inVBytesLen = input.readInt();
    Object inVId = ValueUtils.deserialize(input.readBytes(inVBytesLen));
    edge.setOutVertex(new HBaseVertex(null, outVId));
    edge.setInVertex(new HBaseVertex(null, inVId));
    return edge;
}
 

@Test
public void testVirginKryo()
{
  Kryo coder = new Kryo();
  Kryo decoder = new Kryo();

  ClassIdPair cip = new ClassIdPair();

  Output output = new Output(4096, Integer.MAX_VALUE);
  coder.writeClassAndObject(output, cip);

  Input input = new Input();
  input.setBuffer(output.toBytes());
  decoder.readClassAndObject(input);
}
 

@Test
public void treeNode() {
    final Result<DecisionTreeRuleSet> result = (new CommisionRuleSetSupplier()).get();
    EhSupport.ensure(result.isSuccess(), "Could not create decision tree");
    final DecisionTreeRuleSet ruleSet = result.getData();

    final TreeNode node = DecisionTreeFactory.constructDecisionTree(ruleSet, DecisionTreeType.SINGLE);

    final Kryo kryo = new Kryo();
    // no default no-arg constructors
    kryo.setInstantiatorStrategy(new StdInstantiatorStrategy());

    final InstantiatorStrategy defaultInstantiatorStrategy = new Kryo.DefaultInstantiatorStrategy();
    kryo.getRegistration(ArrayList.class)
            .setInstantiator(defaultInstantiatorStrategy.newInstantiatorOf(ArrayList.class));
    kryo.getRegistration(HashSet.class)
            .setInstantiator(defaultInstantiatorStrategy.newInstantiatorOf(HashSet.class));
    UnmodifiableCollectionsSerializer.registerSerializers(kryo);

    final ByteArrayOutputStream out = new ByteArrayOutputStream();
    final Output output = new Output(out);
    kryo.writeObject(output, node);
    output.flush();
    output.close();

    final ByteArrayInputStream inputStream = new ByteArrayInputStream(out.toByteArray());
    final Input kryoInput = new Input(inputStream);
    final TreeNode tree = kryo.readObject(kryoInput, BaseTreeNode.class);

    final SingleDecisionTreeFactoryTest test = new SingleDecisionTreeFactoryTest();
    test.checkTreeNode(tree, ruleSet);

    assertEquals(node, tree);
}
 

public static <T extends AbstractConfig<?>> T fromFile(final String path, final Class<T> clazz) throws FileNotFoundException {
	final Kryo kryo = new Kryo();
	kryo.setInstantiatorStrategy(new DefaultInstantiatorStrategy(new StdInstantiatorStrategy()));
    try (final Input input = new Input(new FileInputStream(path))) {
		final T bc = kryo.readObject(input, clazz);
		return bc;
	}
}
 

@Test
public void testKyroFunction1() throws Exception {
    User user1 = CoreFactory.createUser1();

    Kryo kryo = KryoSerializerFactory.createKryo();

    byte[] bytes = KryoSerializer.serialize(kryo, user1);
    LOG.info(bytes.toString());

    User user2 = KryoSerializer.deserialize(kryo, bytes);
    LOG.info(user2.toString());
}
 

@Override
public GridCoverageWritable read(
    final Kryo arg0,
    final Input arg1,
    final Class<GridCoverageWritable> arg2) {
  final GridCoverageWritable gcw = new GridCoverageWritable();
  final byte[] data = arg1.readBytes(arg1.readInt());
  try (DataInputStream is = new DataInputStream(new ByteArrayInputStream(data))) {
    gcw.readFields(is);
  } catch (final IOException e) {
    LOGGER.error("Cannot deserialize GridCoverageWritable", e);
    return null;
  }
  return gcw;
}
 

@Override
public void write(Kryo kryo, Output output, AttributeContentEvent event) {		
	output.writeLong(event.learningNodeId, true);
	output.writeInt(event.obsIndex, true);
	output.writeDouble(event.attrVal, PRECISION, true);
	output.writeInt(event.classVal, true);
	output.writeDouble(event.weight, PRECISION, true);
	output.writeBoolean(event.isNominal);
}