MessagePostProcessor (Spring AMQP 2.4.2 API)

All Known Implementing Classes:

AbstractCompressingPostProcessor, AbstractDecompressingPostProcessor, AbstractDeflaterPostProcessor, DeflaterPostProcessor, DelegatingDecompressingPostProcessor, GUnzipPostProcessor, GZipPostProcessor, InflaterPostProcessor, UnzipPostProcessor, ZipPostProcessor

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface MessagePostProcessor
```
Used in several places in the framework, such as AmqpTemplate#convertAndSend(Object, MessagePostProcessor) where it can be used to add/modify headers or properties after the message conversion has been performed. It also can be used to modify inbound messages when receiving messages in listener containers and AmqpTemplates.
It is a FunctionalInterface and is often used as a lambda:
```
 amqpTemplate.convertAndSend(routingKey, m -> {
     m.getMessageProperties().setDeliveryMode(DeliveryMode.NON_PERSISTENT);
     return m;
 });
 
```
Author:

Mark Pollack, Gary Russell

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`Message`	`postProcessMessage(Message message)`	Change (or replace) the message.
`default Message`	`postProcessMessage(Message message, Correlation correlation)`	Change (or replace) the message and/or change its correlation data.
`default Message`	`postProcessMessage(Message message, Correlation correlation, String exchange, String routingKey)`	Change (or replace) the message and/or change its correlation data.

- Method Detail
  - postProcessMessage
```
Message postProcessMessage(Message message)
                    throws AmqpException
```
    Change (or replace) the message.
    
    Parameters:
    
    message - the message.
    
    Returns:
    
    the message.
    
    Throws:
    
    AmqpException - an exception.
  - postProcessMessage
```
default Message postProcessMessage(Message message,
                                   Correlation correlation)
```
    Change (or replace) the message and/or change its correlation data. Only applies to outbound messages.
    
    Parameters:
    
    message - the message.
    
    correlation - the correlation data.
    
    Returns:
    
    the message.
    
    Since:
    
    1.6.7
  - postProcessMessage
```
default Message postProcessMessage(Message message,
                                   Correlation correlation,
                                   String exchange,
                                   String routingKey)
```
    Change (or replace) the message and/or change its correlation data. Only applies to outbound messages.
    
    Parameters:
    
    message - the message.
    
    correlation - the correlation data.
    
    exchange - the exchange to which the message is to be sent.
    
    routingKey - the routing key.
    
    Returns:
    
    the message.
    
    Since:
    
    2.3.4