org.apache.kafka.streams.state

Class StateSerdes<K,V>

java.lang.Object

org.apache.kafka.streams.state.StateSerdes<K,V>

Type Parameters:

K - key type of serde

V - value type of serde

public final class StateSerdes<K,V>
extends Object

Factory for creating serializers / deserializers for state stores in Kafka Streams.

Field Summary

Fields

Modifier and Type	Field and Description
static int	BOOLEAN_SIZE
static int	TIMESTAMP_SIZE

Constructor Summary

Constructors

Constructor and Description

StateSerdes(String topic, org.apache.kafka.common.serialization.Serde<K> keySerde, org.apache.kafka.common.serialization.Serde<V> valueSerde) Create a context for serialization using the specified serializers and deserializers which must match the key and value types used as parameters for this object; the state changelog topic is provided to bind this serde factory to, so that future calls for serialize / deserialize do not need to provide the topic name any more.

Method Summary

Modifier and Type	Method and Description
org.apache.kafka.common.serialization.Deserializer<K>	keyDeserializer() Return the key deserializer.
K	keyFrom(byte[] rawKey) Deserialize the key from raw bytes.
org.apache.kafka.common.serialization.Serde<K>	keySerde() Return the key serde.
org.apache.kafka.common.serialization.Serializer<K>	keySerializer() Return the key serializer.
byte[]	rawKey(K key) Serialize the given key.
byte[]	rawValue(V value) Serialize the given value.
String	topic() Return the topic.
org.apache.kafka.common.serialization.Deserializer<V>	valueDeserializer() Return the value deserializer.
V	valueFrom(byte[] rawValue) Deserialize the value from raw bytes.
org.apache.kafka.common.serialization.Serde<V>	valueSerde() Return the value serde.
org.apache.kafka.common.serialization.Serializer<V>	valueSerializer() Return the value serializer.
static <K,V> StateSerdes<K,V>	withBuiltinTypes(String topic, Class<K> keyClass, Class<V> valueClass) Create a new instance of StateSerdes for the given state name and key-/value-type classes.

Methods inherited from class java.lang.Object

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

Field Detail

TIMESTAMP_SIZE

public static final int TIMESTAMP_SIZE

See Also:

Constant Field Values

BOOLEAN_SIZE

public static final int BOOLEAN_SIZE

See Also:

Constant Field Values

Constructor Detail

StateSerdes

public StateSerdes(String topic,
                   org.apache.kafka.common.serialization.Serde<K> keySerde,
                   org.apache.kafka.common.serialization.Serde<V> valueSerde)

Create a context for serialization using the specified serializers and deserializers which must match the key and value types used as parameters for this object; the state changelog topic is provided to bind this serde factory to, so that future calls for serialize / deserialize do not need to provide the topic name any more.

Parameters:

topic - the topic name

keySerde - the serde for keys; cannot be null

valueSerde - the serde for values; cannot be null

Throws:

IllegalArgumentException - if key or value serde is null

Method Detail

withBuiltinTypes

public static <K,V> StateSerdes<K,V> withBuiltinTypes(String topic,
                                                      Class<K> keyClass,
                                                      Class<V> valueClass)

Create a new instance of StateSerdes for the given state name and key-/value-type classes.

Type Parameters:

K - the key type

V - the value type

Parameters:

topic - the topic name

keyClass - the class of the key type

valueClass - the class of the value type

Returns:

a new instance of StateSerdes

keySerde

public org.apache.kafka.common.serialization.Serde<K> keySerde()

Return the key serde.

Returns:

the key serde

valueSerde

public org.apache.kafka.common.serialization.Serde<V> valueSerde()

Return the value serde.

Returns:

the value serde

keyDeserializer

public org.apache.kafka.common.serialization.Deserializer<K> keyDeserializer()

Return the key deserializer.

Returns:

the key deserializer

keySerializer

public org.apache.kafka.common.serialization.Serializer<K> keySerializer()

Return the key serializer.

Returns:

the key serializer

valueDeserializer

public org.apache.kafka.common.serialization.Deserializer<V> valueDeserializer()

Return the value deserializer.

Returns:

the value deserializer

valueSerializer

public org.apache.kafka.common.serialization.Serializer<V> valueSerializer()

Return the value serializer.

Returns:

the value serializer

topic

public String topic()

Return the topic.

Returns:

the topic

keyFrom

public K keyFrom(byte[] rawKey)

Deserialize the key from raw bytes.

Parameters:

rawKey - the key as raw bytes

Returns:

the key as typed object

valueFrom

public V valueFrom(byte[] rawValue)

Deserialize the value from raw bytes.

Parameters:

rawValue - the value as raw bytes

Returns:

the value as typed object

rawKey

public byte[] rawKey(K key)

Serialize the given key.

Parameters:

key - the key to be serialized

Returns:

the serialized key

rawValue

public byte[] rawValue(V value)

Serialize the given value.

Parameters:

value - the value to be serialized

Returns:

the serialized value