org.apache.flink.streaming.connectors.kafka.internals

类 KafkaDeserializationSchemaWrapper<T>

java.lang.Object

org.apache.flink.streaming.connectors.kafka.internals.KafkaDeserializationSchemaWrapper<T>

类型参数:

T - The type created by the deserialization schema.

所有已实现的接口:

Serializable, org.apache.flink.api.java.typeutils.ResultTypeQueryable<T>, KafkaDeserializationSchema<T>

@Internal
public class KafkaDeserializationSchemaWrapper<T>
extends Object
implements KafkaDeserializationSchema<T>

A simple wrapper for using the DeserializationSchema with the KafkaDeserializationSchema interface.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
KafkaDeserializationSchemaWrapper(org.apache.flink.api.common.serialization.DeserializationSchema<T> deserializationSchema)

方法概要

限定符和类型	方法和说明
T	deserialize(org.apache.kafka.clients.consumer.ConsumerRecord<byte[],byte[]> record) Deserializes the Kafka record.
void	deserialize(org.apache.kafka.clients.consumer.ConsumerRecord<byte[],byte[]> message, org.apache.flink.util.Collector<T> out) Deserializes the Kafka record.
org.apache.flink.api.common.typeinfo.TypeInformation<T>	getProducedType()
boolean	isEndOfStream(T 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

构造器详细资料

KafkaDeserializationSchemaWrapper

public KafkaDeserializationSchemaWrapper(org.apache.flink.api.common.serialization.DeserializationSchema<T> deserializationSchema)

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<T>

参数:

context - Contextual information that can be used during initialization.

抛出:

Exception

deserialize

public T 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<T>

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

deserialize

public void deserialize(org.apache.kafka.clients.consumer.ConsumerRecord<byte[],byte[]> message,
                        org.apache.flink.util.Collector<T> out)
                 throws Exception

从接口复制的说明: KafkaDeserializationSchema

Deserializes the Kafka record.

Can output multiple records through the Collector. Note that number and size of the produced records should be relatively small. Depending on the source implementation records can be buffered in memory or collecting records might delay emitting checkpoint barrier.

指定者:

deserialize 在接口中 KafkaDeserializationSchema<T>

参数:

message - The message, as a byte array.

out - The collector to put the resulting messages.

抛出:

Exception

isEndOfStream

public boolean isEndOfStream(T 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<T>

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<T> getProducedType()

指定者:

getProducedType 在接口中 org.apache.flink.api.java.typeutils.ResultTypeQueryable<T>