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Node Types

Table of Contents

A flow in Agama flow visual editor comprises of several connected nodes. Each node represents an Agama DSL directive. Each node also allows the user to pass parameters to the underlying Agama DSL directive.

Adding a New Node

When the user drags the connector, the Agama Lab presents a list to choose the next node on the connector’s other end.

Select Next Node

Types of Nodes

Start

Every flow starts with a Start node. The Start node helps setup the header fields and input.
Nodes Start

Assignment

Assignment node is used to assign a value or a literal to a variable. Assignment node can work on multiple variables.

Call

Business logic and complex computations can be implemented in languages other than Agama. This external code is called foreign routine. The Call node is used to call such foreign routines. Result of the computation done by the foreign routine is brought back to the flow and stored in a variable that can be used further in the flow.

Trigger

The Trigger node lets one flow call another flow and get results back. Capability of calling a separate flow allows Agama flow to be more modular, reusable and customizable using subflows and template overrides.
Nodes Trigger

Iterate

The Iterate node allows iteration over lists, maps, and string values. Using the configuration parameters provided on the form, it writes the Iterate Over instruction of the Agama DSL.

Repeat

The Repeat node provides a loop construct to the Agama flow. It represents Repeat instruction of Agama DSL.

Quit-when

The Quit-when block allows to abort a loop based on certain conditions. The loop can be an Repeat or Iterate block.

Log

The Log node writes log messages to log files. It represents Log instruction of the Agama DSL.

RRF

RRF stands for Render-Reply-Fetch. Using the configuration parameters provided on the form, it writes the RRF instruction of the Agama DSL to the auto-generated code.

RFAC

The RFAC stands for stands for Redirect and Fetch at callback. Using the configuration parameters provided on the form, it writes the RFAC instruction of the Agama DSL to the auto-generated code.

When

The When node provides the ability to execute a condition and make decisions based on the outcome. Using the configuration parameters provided on the form, it writes the When instruction of the Agama DSL to the auto-generated code.
When block has three branches where the flow execution may continue.
  • Condition met : Blocks on this branch are executed if the condition is evaluated to true.
  • Otherwise : Blocks on this branch are executed if the condition is evaluated to false.
  • Continue: If condition met or otherwise branches does not end the flow, then the flow will continue to execute the blocks on this branch after completing the execution on the respective branch.

There branches logically represent the code shown below:

 When (condition)
// execute blocks on the `condition met` branch
Otherwise
// execute blocks on the `otherwise` branch

// Execute blocks on the `continue` branch

Finish

The Finish node denotes the end of the flow. Using the configuration parameters provided on the form, it writes the Finish instruction of the Agama DSL to the auto-generated code.