org.apache.flink.streaming.util.serialization

类 JSONKeyValueDeserializationSchema

java.lang.Object

org.apache.flink.streaming.util.serialization.JSONKeyValueDeserializationSchema

所有已实现的接口:

Serializable, org.apache.flink.api.java.typeutils.ResultTypeQueryable<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>, KafkaDeserializationSchema<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>

@PublicEvolving
public class JSONKeyValueDeserializationSchema
extends Object
implements KafkaDeserializationSchema<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>

DeserializationSchema that deserializes a JSON String into an ObjectNode.

Key fields can be accessed by calling objectNode.get("key").get(<name>).as(<type>)

Value fields can be accessed by calling objectNode.get("value").get(<name>).as(<type>)

Metadata fields can be accessed by calling objectNode.get("metadata").get(<name>).as(<type>) and include the "offset" (long), "topic" (String) and "partition" (int).

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
JSONKeyValueDeserializationSchema(boolean includeMetadata)

方法概要

限定符和类型	方法和说明
org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode	deserialize(org.apache.kafka.clients.consumer.ConsumerRecord<byte[],byte[]> record) Deserializes the Kafka record.
org.apache.flink.api.common.typeinfo.TypeInformation<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>	getProducedType()
boolean	isEndOfStream(org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode nextElement) Method to decide whether the element signals the end of the stream.
void	open(org.apache.flink.api.common.serialization.DeserializationSchema.InitializationContext context) Initialization method for the schema.

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

构造器详细资料

JSONKeyValueDeserializationSchema

public JSONKeyValueDeserializationSchema(boolean includeMetadata)

方法详细资料

open

public void open(org.apache.flink.api.common.serialization.DeserializationSchema.InitializationContext context)
          throws Exception

从接口复制的说明: KafkaDeserializationSchema

Initialization method for the schema. It is called before the actual working methods KafkaDeserializationSchema.deserialize(org.apache.kafka.clients.consumer.ConsumerRecord<byte[], byte[]>) and thus suitable for one time setup work.

The provided DeserializationSchema.InitializationContext can be used to access additional features such as e.g. registering user metrics.

指定者:

open 在接口中 KafkaDeserializationSchema<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>

参数:

context - Contextual information that can be used during initialization.

抛出:

Exception

deserialize

public org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode 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.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>

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.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode nextElement)

从接口复制的说明: KafkaDeserializationSchema

Method to decide whether the element signals the end of the stream. If true is returned the element won't be emitted.

指定者:

isEndOfStream 在接口中 KafkaDeserializationSchema<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>

参数:

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

返回:

True, if the element signals end of stream, false otherwise.

getProducedType

public org.apache.flink.api.common.typeinfo.TypeInformation<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode> getProducedType()

指定者:

getProducedType 在接口中 org.apache.flink.api.java.typeutils.ResultTypeQueryable<org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode>