com.alibaba.kryo.serializer

Class FastCachedCompatibleFieldSerializer<T>

java.lang.Object

com.esotericsoftware.kryo.kryo5.Serializer<T>

com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer<T>

com.alibaba.kryo.serializer.FastCachedCompatibleFieldSerializer<T>

Type Parameters:

T - Object type that need to serialize and deserialize.

public class FastCachedCompatibleFieldSerializer<T>
extends com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer<T>

Implement a quick and compatible field serializer. Each chunk must be process in a temporarily buffer,then copy the chunk into output stream.The extra memory copy impact the performance. However, in actual use, we find that serialization writes the result to a byte array instead of directly writing it to java.io.OutputStream. In the same way, deserialization reads from the byte data. Instead of reading directly from java.io.InputStream. Because byte arrays can be randomly read and written, we can avoid using Chunk-based temporary buffers to achieve compatibility.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FastCachedCompatibleFieldSerializer.CachedCompatibleFieldSerializerConfig

Nested classes/interfaces inherited from class com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer

com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer.Bind, com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer.CachedField, com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer.FieldSerializerConfig, com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer.NotNull, com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer.Optional

Field Summary

Fields

Modifier and Type	Field and Description
static int	LONGER_FIELD
static int	SHORTER_FIELD_LEN

Constructor Summary

Constructors

Constructor and Description
FastCachedCompatibleFieldSerializer(com.esotericsoftware.kryo.kryo5.Kryo kryo, Class type)
FastCachedCompatibleFieldSerializer(com.esotericsoftware.kryo.kryo5.Kryo kryo, Class type, FastCachedCompatibleFieldSerializer.CachedCompatibleFieldSerializerConfig config)

Method Summary

Modifier and Type	Method and Description
FastCachedCompatibleFieldSerializer.CachedCompatibleFieldSerializerConfig	getCompatibleFieldSerializerConfig()
protected void	initializeCachedFields() Kryo traverses fields by field name, but the JVM does not layout the fields by the name.
T	read(com.esotericsoftware.kryo.kryo5.Kryo kryo, com.esotericsoftware.kryo.kryo5.io.Input input, Class<? extends T> type) Cache layout compare result for deserialization
void	write(com.esotericsoftware.kryo.kryo5.Kryo kryo, com.esotericsoftware.kryo.kryo5.io.Output output, T object) Object metadata sent only once Type encoding for known types and Encode variable-length fields

Methods inherited from class com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer

copy, create, createCopy, getCopyFields, getField, getFields, getFieldSerializerConfig, getKryo, getType, log, popTypeVariables, pushTypeVariables, removeField, removeField, updateFields

Methods inherited from class com.esotericsoftware.kryo.kryo5.Serializer

getAcceptsNull, isImmutable, setAcceptsNull, setImmutable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SHORTER_FIELD_LEN

public static final int SHORTER_FIELD_LEN

See Also:

Constant Field Values

LONGER_FIELD

public static final int LONGER_FIELD

See Also:

Constant Field Values

Constructor Detail

FastCachedCompatibleFieldSerializer

public FastCachedCompatibleFieldSerializer(com.esotericsoftware.kryo.kryo5.Kryo kryo,
                                           Class type)

FastCachedCompatibleFieldSerializer

public FastCachedCompatibleFieldSerializer(com.esotericsoftware.kryo.kryo5.Kryo kryo,
                                           Class type,
                                           FastCachedCompatibleFieldSerializer.CachedCompatibleFieldSerializerConfig config)

Method Detail

initializeCachedFields

protected void initializeCachedFields()

Kryo traverses fields by field name, but the JVM does not layout the fields by the name. If object traverse according the offset of the field in memory, this will give the more chances to hit L1 cache.

Overrides:

initializeCachedFields in class com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer<T>

write

public void write(com.esotericsoftware.kryo.kryo5.Kryo kryo,
                  com.esotericsoftware.kryo.kryo5.io.Output output,
                  T object)

• Object metadata sent only once
• Type encoding for known types and Encode variable-length fields

Overrides:

write in class com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer<T>

Parameters:

kryo - current kryo instance

output - object will write to

object - object need to serialize

read

public T read(com.esotericsoftware.kryo.kryo5.Kryo kryo,
              com.esotericsoftware.kryo.kryo5.io.Input input,
              Class<? extends T> type)

Cache layout compare result for deserialization

Overrides:

read in class com.esotericsoftware.kryo.kryo5.serializers.FieldSerializer<T>

Parameters:

kryo - kryo instance

input - Deserialize input

type - Deserialize object type

Returns:

Deserialize result

getCompatibleFieldSerializerConfig

public FastCachedCompatibleFieldSerializer.CachedCompatibleFieldSerializerConfig getCompatibleFieldSerializerConfig()