Mule Request Reply
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The document discusses how Mule's Request Reply scope enables asynchronous flows to receive responses. It explains that Request Reply converts one-way flows like VM or JMS to request-response by setting the MULE_REPLYTO property with the inbound endpoint path. When exceptions occur in the one-way flow, the Request Reply scope inbound endpoint needs to be explicitly called to handle the response instead of waiting infinitely.
Mule Request Reply
- 1. Mule Request Reply By Ram Bavireddi
- 2. • Sometimes we want response from an asynchronous Mule flow . • For example, we want response from a one-way VM or JMS flow . • How is it possible? • Mule’s Request Reply scope makes is possible
- 3. Mule Request Reply • The Request Reply enables us to receive a response from an asynchronous flow without hard coding the destination of the response • We can convert a one-way VM or JMS flow to a request- response flow without having to change it’s configuration
- 4. Let us get response from this one-way VM flow
- 6. Testing • Test the flow by hitting this url http://localhost:8081/test • We can see below logger on the console org.mule.api.processor.LoggerMessageProcessor: one - way VM payload • So the Request Reply waits for the response from the one- way VM flow • How it works?
- 7. How it works? • When Mule asynchronously sends a request via the VM outbound-endpoint in the Request-Reply scope, it implicitly sets the message’s outbound property – MULE_REPLYTO • The value of this MULE_REPLYTO property would refer to path of inbound-endpoint in the Request-Reply scope
- 8. When an Exception occurs in the one-way VM flow • When an Exception occurs in the one-way VM flow, Mule is unable to call the inbound-endpoint in the Request-Reply scope. • In such a case we need to explicitly call the inbound-endpoint by handling the exception. Otherwise the caller flow where Request-Reply is configured waits infinitely for the response from the one-way VM flow
- 9. When an Exception occurs in the one-way VM flow Let us suppose the component org.ram.BusinessComponent throws an exception