If you route a message with a flow reference to a sub flow, the flow message is processed how?

If you route a message with a flow reference to a sub flow, the flow message is processed how?

• A. The message is processed asynchronously
• B. The message is processed synchronously
• C. The message is discarded
• D. The system throws an error

Answer: (B)

Invoking a sub-flow with a flow reference processes the message synchronously. It runs on the same processing thread as the calling flow, and the parent flow waits for the sub-flow to finish before continuing. The payload returned after the flow-reference completes is whatever the sub-flow leaves as the message payload (subject to any further changes in the caller). If an error occurs in the sub-flow, it follows the defined error handling for the flow. If asynchronous behavior is needed, you’d structure the flows differently (for example, using an async scope or a separate flow invoked asynchronously).

Invoking a sub-flow with a flow reference processes the message synchronously. It runs on the same processing thread as the calling flow, and the parent flow waits for the sub-flow to finish before continuing. The payload returned after the flow-reference completes is whatever the sub-flow leaves as the message payload (subject to any further changes in the caller). If an error occurs in the sub-flow, it follows the defined error handling for the flow. If asynchronous behavior is needed, you’d structure the flows differently (for example, using an async scope or a separate flow invoked asynchronously).