View Source Reactor

Elixir CI License: MIT Hex version badge

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


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


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

def deps do
    {:reactor, "~> 0.8.4"}


Documentation for the latest release will be available on hexdocs and for the main branch.


  • 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.


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