mapping jms property to RabbitMQ - spring-integration

Question

We use spring integration to communicate components using MQSeries and RabbitMQ.
With MQseries there are a lot of JMS properties that are used by customers.
We would like to add an intermediate function between the input and the output which makes a mapping of these properties (getting the jms_priority from mqseries and put in the output message the property "priority" for RabbitMQ).
Without the specific properties JMS it works very well.
Below the code we use:
<int:channel id="input" ></int:channel>
<int-jms:message-driven-channel-adapter id="jmsIn" connection-factory="connectionFactoryCaching" channel="input" ...>
<int:service-activator id="sa1" input-channel="input" ref="serviceBean" output-channel="output"/>
<bean id="serviceBean" class="com.poc.ServiceActivator"> </bean>
<int:channel id="output" ></int:channel>
<int-amqp:outbound-channel-adapter channel="output" .../>
import org.springframework.amqp.core.MessageProperties;
The ServiceActivator code:
public class ServiceActivator {
public org.springframework.amqp.core.Message convertMessageMQSeriesToRabbit (Message obj){
MessageProperties messageProperties = new MessageProperties();
try {
messageProperties.setCorrelationId(obj.getJMSCorrelationID());
System.out.println("getJMSReplyTo "+obj.getJMSReplyTo());
System.out.println("getJMSPriority "+obj.getJMSPriority());
messageProperties.setPriority(obj.getJMSPriority());
System.out.println("getJMSType "+obj.getJMSType());
} catch (JMSException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Is this the right way to do it? In the convertMessageMQSeriesToRabbit method, what type of return object should be passed to the outbound? org.springframework.amqp.core.Message ?
In this method we want to fill all RabbitMQmessage properties (content_type, content_encoding, priority, correlation_id, reply_to, expiration, message_id, timestamp, type, user_id, app_id, cluster_id) with corresponding JMS value.
We also need to do it the other way (inboud rabbitMQ => outbound mqseries)

Answer 1

No, Spring Integration uses its own abstraction org.springframework.messaging.Message<?>. You don't need to interact with it directly, simply use a header-enricher.
See JmsHeaders and AmqpHeaders for the constants.
<header-enricher id="headerEnricherWithShouldSkipNullsFalse" input-channel="fromJms" output-channel="toRabbit">
<header name="amqp_correlationId" expression="headers.jms_correlationId"/>
...
</header-enricher>
For AMQP priority, the standard IntegrationMessageHeaderAccessor.PRIORITY value is used.
Also see the DefaultAmqpHeaderMapper and DefaultJmsHeaderMapper to see how the adapters map from Message<?> to/from RabbitMQ and JMS messageds.