Wednesday 28 February 2024

Flow reference is synchronous. True or false ? in MuleSoft 79

 Flow reference is synchronous. True or false ? in MuleSoft

In MuleSoft 4, the statement "Flow reference is synchronous" is False.

Flow references in MuleSoft 4 are asynchronous by default. This means that when a flow references another flow, the calling flow does not wait for the referenced flow to finish processing before continuing its execution.

Here's a breakdown of the key points:

  • Synchronous Flow: When a flow calls another flow synchronously, the calling flow waits for the called flow to complete before continuing its own execution. This can lead to potential performance issues, especially if the called flow takes a long time to process.

  • Asynchronous Flow (Flow Reference): In MuleSoft 4, flow references are designed to be asynchronous. This means the calling flow continues its execution immediately after calling the referenced flow. The referenced flow runs independently and its results, if any, are typically sent back to the calling flow through a configured mechanism like a message queue or a correlation ID.

Benefits of Asynchronous Flow References:

  • Improved Performance: Asynchronous communication avoids blocking the calling flow, allowing it to continue processing other messages while the referenced flow runs. This can lead to significant performance improvements, especially in scenarios involving long-running processes.

  • Scalability: Asynchronous processing facilitates handling high volumes of messages efficiently. The calling flow doesn't get blocked, allowing it to process incoming messages concurrently with ongoing asynchronous operations.

  • Decoupling: Asynchronous flow references promote loose coupling between flows. The calling flow doesn't need to be aware of the internal workings or completion time of the referenced flow.


  • While flow references in MuleSoft 4 are asynchronous by default, you can configure them to behave synchronously in specific situations using the synchronous attribute within the flow reference configuration.

  • For most use cases, leveraging the default asynchronous behavior of flow references is recommended for improved performance, scalability, and decoupling in your MuleSoft 4 integrations.

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