org.apache.flink.streaming.util.serialization

类 TypeInformationKeyValueSerializationSchema<K,V>

java.lang.Object

org.apache.flink.streaming.util.serialization.TypeInformationKeyValueSerializationSchema<K,V>

类型参数:

K - The key type to be serialized.

V - The value type to be serialized.

所有已实现的接口:

Serializable, org.apache.flink.api.java.typeutils.ResultTypeQueryable<org.apache.flink.api.java.tuple.Tuple2<K,V>>, KafkaDeserializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>, KeyedSerializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>

@PublicEvolving
public class TypeInformationKeyValueSerializationSchema<K,V>
extends Object
implements KafkaDeserializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>, KeyedSerializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>

A serialization and deserialization schema for Key Value Pairs that uses Flink's serialization stack to transform typed from and to byte arrays.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
TypeInformationKeyValueSerializationSchema(Class<K> keyClass, Class<V> valueClass, org.apache.flink.api.common.ExecutionConfig config) Creates a new de-/serialization schema for the given types.
TypeInformationKeyValueSerializationSchema(org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo, org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo, org.apache.flink.api.common.ExecutionConfig ec) Creates a new de-/serialization schema for the given types.

方法概要

限定符和类型	方法和说明
org.apache.flink.api.java.tuple.Tuple2<K,V>	deserialize(org.apache.kafka.clients.consumer.ConsumerRecord<byte[],byte[]> record) Deserializes the Kafka record.
org.apache.flink.api.common.typeinfo.TypeInformation<org.apache.flink.api.java.tuple.Tuple2<K,V>>	getProducedType()
String	getTargetTopic(org.apache.flink.api.java.tuple.Tuple2<K,V> element) Optional method to determine the target topic for the element.
boolean	isEndOfStream(org.apache.flink.api.java.tuple.Tuple2<K,V> nextElement) This schema never considers an element to signal end-of-stream, so this method returns always false.
byte[]	serializeKey(org.apache.flink.api.java.tuple.Tuple2<K,V> element) Serializes the key of the incoming element to a byte array This method might return null if no key is available.
byte[]	serializeValue(org.apache.flink.api.java.tuple.Tuple2<K,V> element) Serializes the value of the incoming element to a byte array.

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.streaming.connectors.kafka.KafkaDeserializationSchema

deserialize, open

构造器详细资料

TypeInformationKeyValueSerializationSchema

public TypeInformationKeyValueSerializationSchema(org.apache.flink.api.common.typeinfo.TypeInformation<K> keyTypeInfo,
                                                  org.apache.flink.api.common.typeinfo.TypeInformation<V> valueTypeInfo,
                                                  org.apache.flink.api.common.ExecutionConfig ec)

Creates a new de-/serialization schema for the given types.

参数:

keyTypeInfo - The type information for the key type de-/serialized by this schema.

valueTypeInfo - The type information for the value type de-/serialized by this schema.

ec - The execution config, which is used to parametrize the type serializers.

TypeInformationKeyValueSerializationSchema

public TypeInformationKeyValueSerializationSchema(Class<K> keyClass,
                                                  Class<V> valueClass,
                                                  org.apache.flink.api.common.ExecutionConfig config)

Creates a new de-/serialization schema for the given types. This constructor accepts the types as classes and internally constructs the type information from the classes.

If the types are parametrized and cannot be fully defined via classes, use the constructor that accepts TypeInformation instead.

参数:

keyClass - The class of the key de-/serialized by this schema.

valueClass - The class of the value de-/serialized by this schema.

config - The execution config, which is used to parametrize the type serializers.

方法详细资料

deserialize

public org.apache.flink.api.java.tuple.Tuple2<K,V> deserialize(org.apache.kafka.clients.consumer.ConsumerRecord<byte[],byte[]> record)
                                                        throws Exception

从接口复制的说明: KafkaDeserializationSchema

Deserializes the Kafka record.

指定者:

deserialize 在接口中 KafkaDeserializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>

参数:

record - Kafka record to be deserialized.

返回:

The deserialized message as an object (null if the message cannot be deserialized).

抛出:

Exception

isEndOfStream

public boolean isEndOfStream(org.apache.flink.api.java.tuple.Tuple2<K,V> nextElement)

This schema never considers an element to signal end-of-stream, so this method returns always false.

指定者:

isEndOfStream 在接口中 KafkaDeserializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>

参数:

nextElement - The element to test for the end-of-stream signal.

返回:

Returns false.

serializeKey

public byte[] serializeKey(org.apache.flink.api.java.tuple.Tuple2<K,V> element)

从接口复制的说明: KeyedSerializationSchema

Serializes the key of the incoming element to a byte array This method might return null if no key is available.

指定者:

serializeKey 在接口中 KeyedSerializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>

参数:

element - The incoming element to be serialized

返回:

the key of the element as a byte array

serializeValue

public byte[] serializeValue(org.apache.flink.api.java.tuple.Tuple2<K,V> element)

从接口复制的说明: KeyedSerializationSchema

Serializes the value of the incoming element to a byte array.

指定者:

serializeValue 在接口中 KeyedSerializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>

参数:

element - The incoming element to be serialized

返回:

the value of the element as a byte array

getTargetTopic

public String getTargetTopic(org.apache.flink.api.java.tuple.Tuple2<K,V> element)

从接口复制的说明: KeyedSerializationSchema

Optional method to determine the target topic for the element.

指定者:

getTargetTopic 在接口中 KeyedSerializationSchema<org.apache.flink.api.java.tuple.Tuple2<K,V>>

参数:

element - Incoming element to determine the target topic from

返回:

null or the target topic

getProducedType

public org.apache.flink.api.common.typeinfo.TypeInformation<org.apache.flink.api.java.tuple.Tuple2<K,V>> getProducedType()

指定者:

getProducedType 在接口中 org.apache.flink.api.java.typeutils.ResultTypeQueryable<org.apache.flink.api.java.tuple.Tuple2<K,V>>