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Flows

A flow is a Mule component that allows you to order Mule event processors (such as connectors and other components) in a valid arrangement to automate integration processes.

A flow is in essence a chain of event processors. Typically, a flow starts with an event source. When the event source is triggered (for example, through an HTTP Listener), a Mule event is created.

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When an event is received or generated by the event source, the flow starts, and the configured event processors are invoked in a chain in the same order as they are configured.

Some event processors accept child event processor elements, which are processed before the remaining processors in the flow are processed.

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Flows can connect and trigger other flows.

There are two ways of connecting flows:

  • Through an endpoint, which uses transports (such as HTTP or JMS connectors) to connect the flow to external flows or services.

  • Through a Flow Reference component, which connects flows within the Mule app.

Note that flows always function synchronously. If you need to achieve asynchronous patterns, such as Fire-and-Forget, you can use the Async (<async>) component.

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