Mule enricher
- 1. Karthik
- 2. Enricher is used if the target system needs more information than the source system can provide. It enriches the mule message by calling external system or do some transformation to existing payload and save it into some scope of variable like session or outbound or invocation and the transformation happened in en-richer scope doesn't affect the actual payload.
- 3. Set-property: Save some information extracted from payload or original payload to some invocation or flow scope variable. NOTE: Mule currently supports enrichment of flow variables and message headers only. Example: Consider a message from a source system contains a zip code but the target system needs the two letter state. A message enricher can be used to lookup the state using the zip (postal code) from an enrichment resource. The enricher calls out to the enrichment resource with the current message (containing the zip code) then enriches the current message with the result.
- 5. This is a very simple flow with one-way inbound and outbound endpoints, and which acts as part of an order processing pipeline. This flow uses an enricher to add a state flow variable to the current message with the state that the flow ref returns. The ‘target’ attribute defines how the current message is enriched using a MessageEnricher which uses the same syntax as expression evaluators.
- 6. Description: 1. The http endpoint receives an xml input as a payload with H-No, street, city and zip elements. 2. In message enricher we modified the payload as zip and forwarded the same to sub flow to retrieve the state for that particular zip. 3. The flow reference in the processor chain of the enricher receives the state as a payload which enricher assigns to a new target flow variable named state. 4. The payload sent from the enricher is the same as the input payload and the new state variable is added to the xml using Data-Mapper.
- 7. Output:
- 8. The enricher element also supports more advanced use cases where the message returned by the enrichment resource isn’t just a simple string which is exactly what we need to enrich the current message with; often you may want to enrich your message with just part of the information from the result of the invocation of an external service. More Complex Enrichment
- 9. In this particular example the ‘Get State’ endpoint receives the full message, and we are supposed to use a part of that payload. Here we mention the part of the payload in the Source section of the Message Enricher and that is saved in the target section.
- 10. The “enrichment resource” can be any message processor, outbound connector, processor-chain or flow-ref. If using an outbound-connector then of course it should have a request-response exchange pattern.
- 11. Thank You All