Clean Architecture Toolkit for .NET
Clean Architecture Toolkit is a clean, modular architecture foundation for .NET applications. It embraces SOLID principles and focuses on maintainability, testability, and scalability through clear boundaries and pluggable design.
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Code Reference

» Cat.FluentWorkflows.Abstractions Assembly

Cat.FluentWorkflows.Abstractions Namespace

Defines the contracts for fluent workflows: workflows and their state, the builder you describe steps with, the step bodies that do the work, and the processors that run them.

Interfaces
ICatForeachState<TCollection,TWorkflowState>	The state of the steps inside a foreach. It holds the current item and the state of the workflow around the loop.
ICatHasSubWorkflowState<TSubWorkflowState>	Marks a workflow state that carries the state for a sub-workflow.
ICatStepBodyAsync	The code of one step. Derive from `CatStepBody` or `CatStepBodyAsync` instead of implementing this yourself.
ICatStepBodyWithState<TWorkflowState>	Marks a step body that wants the state of the workflow. The step processor sets it before the step runs.
ICatStepBuilder<TWorkflowState,TStepBody>	Connects a step to the workflow state. Inputs go from the state into the step before it runs. Outputs go from the step back into the state after it ran.
ICatStepParameter	One input or output of a step.
ICatStepProcessor	Runs a list of steps one by one. Steps like if and foreach use it to run their own inner steps.
ICatSwitchCaseBuilder<TWorkflowState,TSwitchValue>	Describes the cases of a switch step.
ICatWorkflow<TWorkflowState>	Describes one workflow: the steps to run, in order. Implement it once per workflow. The module finds and registers it for you.
ICatWorkflowBuilder<TWorkflowState>	Collects the steps of a workflow. You get one in Build(ICatWorkflowBuilder<TWorkflowState>). The steps themselves are extension methods in `Cat.FluentWorkflows.Extensions`. Each one adds a step to WorkflowSteps, and the steps run in the order they were added.
ICatWorkflowProcessor	Single entry point for running a workflow.
ICatWorkflowResponse	The outcome of a step or a workflow: what to do next, and the errors if something failed.
ICatWorkflowState<TWorkflowState>	Marks the class that holds the data of a workflow. Steps read from it and write to it. Implement it with the class itself as the type argument, like `class OrderState : ICatWorkflowState<OrderState>`.
ICatWorkflowStep	One step in a workflow: the step body to run and how it connects to the state.

Enums
CatStepExecutionResult	Tells the step processor what to do after a step. Every step returns one inside its workflow response.