Reactor

Reactor is a dynamic, concurrent, dependency resolving saga orchestrator.

Woah. That's a lot. Let's break it down:

• Saga orchestrator A saga is a way of providing transaction-like semantics across multiple distinct resources.
• Dependency resolving reactor allows you to describe the dependencies between your saga steps using arguments which are converted into a DAG and used to compute execution order.
• Concurrent unless otherwise specified reactor will run as many steps as possible concurrently whilst taking into account the results of the dependency resolution.
• Dynamic whilst you can define a reactor statically using our awesome DSL, you can also build workflows dynamically - and even add steps while the reactor is running.

saga pattern

Sponsors

Thanks to Alembic Pty Ltd for sponsoring a portion of this project's development.

Installation

Reactor contains an igniter installer, so if you have igniter installed already you can run mix igniter.install reactor to add Reactor to your app.

The package can be installed by adding reactor to your list of dependencies in mix.exs:

def deps do
  [
    {:reactor, "~> 0.17.0"}
  ]
end

Documentation

Our documentation is organized to help you find exactly what you need:

🎓 Learning Reactor - Tutorials

Step-by-step guides that teach Reactor through hands-on practice:

• Getting Started - Build your first Reactor
• Recursive Execution - Advanced iterative patterns

🔧 Solving Problems - How-to Guides

Practical solutions for real-world scenarios:

• Payment Processing - E-commerce workflows
• Data Pipelines - ETL orchestration
• Testing Strategies - Testing approaches

📚 API Reference

Complete technical reference:

• DSL Documentation - Complete DSL syntax (auto-generated)
• HexDocs - Generated API documentation
• Latest (main branch) - Development docs

💡 Understanding Reactor - Explanations

Conceptual guides about how and why Reactor works:

• Core Concepts - Sagas, DAGs, compensation
• Architecture - Internal design
• Ecosystem - Integration patterns

Quick Start: New to Reactor? Start with the Getting Started tutorial!

Contributing

• To contribute updates, fixes or new features please fork and open a pull-request against main.
• Please use conventional commits - this allows us to dynamically generate the changelog.
• Feel free to ask any questions on the #reactor channel on the Ash Discord.

Licence

reactor is licensed under the terms of the MIT license. See the LICENSE file in this repository for details.