EventRouter

Specs

One domain event can have multiple side-effects in your system, for example sending emails, creating notifications, tasks, audit logs, event store, updating other system resources async and many more.

EventRouter helps you organise your application domain events side-effects in a simple and intuitive way. No more bloated workers that does many actions, which violates Single responsiblity principle.

Installation

Add this line to your application's Gemfile:

gem 'event_router'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install event_router

EventRouter is already pre-configured with some defaults. Please check the wikis for more info on how to update the configurations.

Usage

Event

It is very easy to create a new domain event and deliver it to multiple destinations.

  • Create your new domain event and define the destination:
  class OrderPlaced < EventRouter::Event
    deliver_to :email_notifier, handler: EmailNotifier
  end
  • Create your handler:
  class EmailNotifier
    def self.order_placed(event, payload)
      # [TODO] Handle the event here
    end
  end
  • Publish your event:
  OrderPlaced.publish(order_id: 1, time: Time.now)

And your are done! 🎉

Destinations

A single event can define multiple destinations, and each destination can have different set of options.

class OrderPlaced < EventRouter::Event
  deliver_to :email_notifier, handler: EmailNotifier
  deliver_to :event_store, handler: EventStore, handler_method: :custom_method
end

For the full list of options, please check the wikis 📚.

Delivery Adapters

You can configure how your events are delivered to their destinations. EventRouter currently supports two different delivery adapters:

  • Sync
  • Sidekiq

The sync adapter is the default delivery adapter and does not require any dependencies. To asynchronously process your event, please use other backends, e.g Sidekiq.

To setup other adapters, please check the wikis 📚.

Serializers

Similarly, you can configure how events are serialized before they are handed to the delivery adapter. This is mainly to provide flexibility on how events are stored in the delivery backend and maintain the objects structure.

  • Json
  • Oj

The json adapter is the default serializer adapter and does not require any dependencies.

To setup other adapters, please check the wikis 📚.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/ahmad-elassuty/event_router. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

Special thanks to Ivan for doing code review 🔍

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the EventRouter project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.