Package org.springframework.kafka.support.converter

Class ProjectingMessageConverter

java.lang.Object

org.springframework.kafka.support.converter.MessagingMessageConverter

org.springframework.kafka.support.converter.ProjectingMessageConverter

All Implemented Interfaces:

MessageConverter, RecordMessageConverter

public class ProjectingMessageConverter
extends MessagingMessageConverter

A MessageConverter implementation that uses a Spring Data ProjectionFactory to bind incoming messages to projection interfaces.

Since:

2.1.1

Author:

Oliver Gierke, Artem Bilan, Gary Russell

Field Summary

Fields inherited from class org.springframework.kafka.support.converter.MessagingMessageConverter

logger

Constructor Summary

Constructors

Constructor	Description
ProjectingMessageConverter()	Create a new ProjectingMessageConverter using a JacksonUtils.enhancedObjectMapper() by default.
ProjectingMessageConverter(com.fasterxml.jackson.databind.ObjectMapper mapper)	Create a new ProjectingMessageConverter using the given ObjectMapper.
ProjectingMessageConverter(com.fasterxml.jackson.databind.ObjectMapper mapper, MessagingMessageConverter delegate)	Create a new ProjectingMessageConverter using the given ObjectMapper.
ProjectingMessageConverter(MessagingMessageConverter delegate)	Create a new ProjectingMessageConverter using the given ObjectMapper.

Method Summary

Modifier and Type	Method	Description
protected Object	convertPayload(Message<?> message)	Subclasses can convert the payload; by default, it's sent unchanged to Kafka.
protected Object	extractAndConvertValue(org.apache.kafka.clients.consumer.ConsumerRecord<?,?> record, Type type)	Subclasses can convert the value; by default, it's returned as provided by Kafka unless there is a SmartMessageConverter that can convert it.

Methods inherited from class org.springframework.kafka.support.converter.MessagingMessageConverter

fromMessage, getMessagingConverter, initialRecordHeaders, setGenerateMessageId, setGenerateTimestamp, setHeaderMapper, setMessagingConverter, setRawRecordHeader, toMessage

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.kafka.support.converter.MessageConverter

commonHeaders

Constructor Details

ProjectingMessageConverter

public ProjectingMessageConverter()

Create a new ProjectingMessageConverter using a JacksonUtils.enhancedObjectMapper() by default.

Since:

2.3

ProjectingMessageConverter

public ProjectingMessageConverter(com.fasterxml.jackson.databind.ObjectMapper mapper)

Create a new ProjectingMessageConverter using the given ObjectMapper.

Parameters:

mapper - must not be null.

ProjectingMessageConverter

public ProjectingMessageConverter(MessagingMessageConverter delegate)

Create a new ProjectingMessageConverter using the given ObjectMapper.

Parameters:

delegate - the delegate converter for outbound and non-interfaces.

Since:

2.3

ProjectingMessageConverter

public ProjectingMessageConverter(com.fasterxml.jackson.databind.ObjectMapper mapper,
 MessagingMessageConverter delegate)

Create a new ProjectingMessageConverter using the given ObjectMapper.

Parameters:

mapper - must not be null.

delegate - the delegate converter for outbound and non-interfaces.

Since:

2.3

Method Details

convertPayload

protected Object convertPayload(Message<?> message)

Description copied from class: MessagingMessageConverter

Subclasses can convert the payload; by default, it's sent unchanged to Kafka.

Overrides:

convertPayload in class MessagingMessageConverter

Parameters:

message - the message.

Returns:

the payload.

extractAndConvertValue

protected Object extractAndConvertValue(org.apache.kafka.clients.consumer.ConsumerRecord<?,?> record,
 Type type)

Description copied from class: MessagingMessageConverter

Subclasses can convert the value; by default, it's returned as provided by Kafka unless there is a SmartMessageConverter that can convert it.

Overrides:

extractAndConvertValue in class MessagingMessageConverter

Parameters:

record - the record.

type - the required type.

Returns:

the value.