Camel supports the Request Reply from the EIP patterns by supporting the Exchange Pattern on a Message which can be set to InOut to indicate a request/reply. Camel Components then implement this pattern using the underlying transport or protocols.
For example when using JMS with InOut the component will by default perform these actions
- create by default a temporary inbound queue
- set the JMSReplyTo destination on the request message
- set the JMSCorrelationID on the request message
- send the request message
- consume the response and associate the inbound message to the request using the JMSCorrelationID (as you may be performing many concurrent request/responses).
Explicitly specifying InOut
When consuming messages from JMS a Request-Reply is indicated by the presence of the JMSReplyTo header.
You can explicitly force an endpoint to be in Request Reply mode by setting the exchange pattern on the URI. e.g.
You can specify the exchange pattern in DSL rule or Spring configuration.
Using This Pattern
If you would like to use this EIP Pattern then please read the Getting Started, you may also find the Architecture useful particularly the description of Endpoint and URIs. Then you could try out some of the Examples first before trying this pattern out.