org.apache.pulsar.client.api

Interface MessagePayloadProcessor

public interface MessagePayloadProcessor

The processor to process a message payload. It's responsible to convert the raw buffer to some messages, then trigger some callbacks so that consumer can consume these messages and handle the exception if it existed. The most important part is to decode the raw buffer. After that, we can call MessagePayloadContext.getMessageAt(int, int, org.apache.pulsar.client.api.MessagePayload, boolean, org.apache.pulsar.client.api.Schema<T>) or MessagePayloadContext.asSingleMessage(org.apache.pulsar.client.api.MessagePayload, org.apache.pulsar.client.api.Schema<T>) to construct Message for consumer to consume. Since we need to pass the MessagePayload object to these methods, we can use MessagePayloadFactory.DEFAULT to create it or just reuse the payload argument.

Field Summary

Fields

Modifier and Type	Field and Description
static MessagePayloadProcessor	DEFAULT

Method Summary

Modifier and Type	Method and Description
<T> void	process(MessagePayload payload, MessagePayloadContext context, Schema<T> schema, Consumer<Message<T>> messageConsumer) Process the message payload.

Field Detail

DEFAULT

static final MessagePayloadProcessor DEFAULT

Method Detail

process

<T> void process(MessagePayload payload,
                 MessagePayloadContext context,
                 Schema<T> schema,
                 Consumer<Message<T>> messageConsumer)
          throws Exception

Process the message payload.

Type Parameters:

T -

Parameters:

payload - the payload whose underlying buffer is a Netty ByteBuf

context - the message context that contains the message format information and methods to create a message

schema - the message's schema

messageConsumer - the callback to consume each message

Throws:

Exception