What is flow variable in mule?

The Flow Variable is used to set or remove the variable tied to message in current flow. … The Flow Variable can be accessed in current flow, calling flows (sub flow/private flow) and even their child flows. The Flow Variable can be accessed using syntax #[flowVars.Id] if the Id is the name of flow variable.

What is flow in Mule?

What Is a Flow? A flow is a connected collection of Mule components. It usually consists of an inbound endpoint component (from where a message originates), and an outbound endpoint component. Therefore, the flow is responsible for the various processing stages in which the message may undergo.

What is the difference between flow variable and session variable?

From what I understood from the training videos, the difference lies in the scope of these variables. Session variables are meant to persist between flows, but flow variables are not supposed to persist.

What are Mule variables?

Variables are used to store per-event values for use within a flow of a Mule app. The stored data can be any supported data type, such as an object, number, or string.

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What is flow control in Mulesoft?

Flow Control (Routers)

It is basically routing the input Mule event to other sequence(s) of components. … Choice and Scatter-Gather routers are the most used routers under Flow Control component.

What is synchronous flow in Mule?

Mule automatically sets a flow to be Synchronous or queued-asynchronous. A flow is set to synchronous if the message source is request-response. The flow partakes in a transaction. Otherwise, a flow is set to queued-asynchronous.

What is sub flow?

Subflows are a sequence of reusable actions to use in a flow. Developers can create subflows to perform common processes specific to a custom application. Subflows consist of: Subflow inputs to pass variables to the actions in the subflow.

What are the scope of flow and session variables if we are using VM connector?

The scope of a flow variable is within a flow or subflow until there is no transport barrier like HTTP, VM, etc. Session variable scope is throughout the app even though there is a transport barrier.

What are session variables in mule 4?

There is only one type of variable in mule 4. It’s scope is same as session variable. You can use set variable component for setting the variable and then fetch it using # [vars. variableName] in dataweave language.

How do you call a variable in mule 4?

You can create or update variables in these ways:

  1. Using the Set Variable component.
  2. Using a Target Variable from within an operation, such as the Read operation to the File connector or the Store operation to the Database connector.
  3. Using the Datwave Transform Component (EE-Only).
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What is remove variable in Mule 4?

Remove variable is used to clear up space occupied by a variable which we have created and which is no longer in use, clearing up the heap memory which can be utilized anywhere else.

What is event in Mule?

A Mule event contains the core information processed by the runtime. It travels through components inside your Mule app following the configured application logic. … A Mule Message contains a message payload and its associated attributes. Variables are Mule event metadata that you use in your flow.

What is set payload in Mule?

The Set Payload ( set-payload ) component lets you update the payload of the message. … The encoding of the value assigned to the payload, for example, UTF-8 . The mimeType and encoding attributes will not affect a DataWeave expression used as value . They only affect the output Mule Message.

What is choice router in Mule?

The Choice router dynamically routes messages through a flow according to a set of DataWeave expressions that evaluate message content. … Only one of the routes in the Choice router executes, meaning that the first expression that evaluates to true triggers that route’s execution and the others are not checked.

What is error handling in Mule 4?

Error Handling is the mechanism wherein the errors are controlled, and some flow is executed when Error occurs in the Mule Flow. … If there is an error in the Flow, then the subsequent Flow will not get executed, and the Error is thrown.

What is Mel in MuleSoft?

MEL is a lightweight, Mule-specific expression language that you can use to access and evaluate the data in the payload, properties and variables of a Mule message.

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