public void setDefaultDefaultDeliveryMode(MessageDeliveryMode defaultDefaultDeliveryMode) {
		Assert.notNull(defaultDefaultDeliveryMode, "'defaultDeliveryMode' cannot be null");
		this.defaultDefaultDeliveryMode = defaultDefaultDeliveryMode;
	}
Set a {@link org.springframework.amqp.core.MessagePostProcessor} to compress messages. Defaults to a
{@link org.springframework.amqp.support.postprocessor.GZipPostProcessor}.
@param compressingPostProcessor the post processor.
spring-xd-messagebus-rabbit/src/main/java/org/springframework/xd/dirt/integration/rabbit/RabbitMessageBus.java