Popularity
6.0
Declining
Activity
0.0
Stable
31
2
1

Programming language: Crystal
License: MIT License
Tags: Misc    

evented alternatives and similar shards

Based on the "Misc" category.
Alternatively, view evented alternatives based on common mentions on social networks and blogs.

Do you think we are missing an alternative of evented or a related project?

Add another 'Misc' Shard

Popular Comparisons

SaaSHub - Software Alternatives and Reviews
More from our partner

README

Evented

A micro library providing Crystal objects with Publish-Subscribe capabilities

Build Status

  • Decouple core business logic from external concerns in Hexagonal style architectures
  • Use as an alternative to callbacks and Observers
  • Connect objects based on context without permanence
  • React to events synchronously

Installation

Add this to your application's shard.yml:

dependencies:
  evented:
    github: krisleech/evented

Usage

Publishing

By including Evented::Publisher your objects get broadcast and subscribe methods.

broadcast can be called from within your object whenever you want to broadcast a significant event.

require "evented"

class MyPublisher
  include Evented::Publisher

  def call(input)
    result = do_something(input)
    broadcast(:something_happened, result)
  end
end

Subscribing

To subscribe an object to receive events include Evented::Subscriber and provide your own on_event method which will receive 2 arguments, the event_name and payload.

require "evented"

class MySubscriber
  include Evented::Subscriber

  def on_event(event_name, payload)
    # ...
  end
end

To subscribe the listener to a publisher:

publisher = MyPublisher.new
publisher.subscribe(MySubscriber.new)

publisher.call("hello")

In the above example the subscriber will have on_event(:something_happened, "hello") called.

Development

Specs

crystal spec

Automatically run Specs

ls ./**/*.cr | entr crystal spec

Contributing

  1. Fork it ( https://github.com/krisleech/evented/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request

Contributors