Unfolding

When a diagram is to be executed, it is unfolded, meaning it will be converted into a flat structure. This process will reduce any nested nodes into their underlying nodes. It will then connect everything with input/output nodes. Furthermore it will pass on any node params which will act as global params inside resolved underlying nodes.

// When creating the execution
const { diagram } = UnfoldedDiagramFactory.create(original, definitions)

Let’s consider an example!

Main diagram

Here we have a diagram with a custom node FooBarStamper. Give it a run!

FooBarStamper implementation

The FooBarStamper will simply take all incoming items, add a foo property with value ‘bar’, then output it. Note how the green input and output nodes corresponds to the ports of FooBarStamper instantiation in the main diagram.

Unfolded Main diagram

When executing the diagram, behind the scenes, it will first be unfolded, resulting in the topology below. This is typically a backend/headless only operation, not visible in the UI.