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A lightweight library with an implementation of Pub-Sub.

Project description

# Domain Events

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A lightweight library with an implementation of Pub-Sub.

## Install

$ pipenv install domain-events


$ pip install domain-events

## Usage

In order to have the pub-sub working in your application, you'll need to write your own subscribers and to subscribe them to the publisher.

`domain-events` provides an interface for subscribers that needs to be implemented by your own subscribers in the first place. Two methods are mandatory: `handle(self, event)` and `_events_subscribed_to(self)`. Following is an example of how to do it.


from domain_events import Subscriber

class ExampleSubscriber(Subscriber):

def handle(self, event):
# Logic to handle the occurring event

def _events_subscribed_to(self):
""" Return the tuple of events it is subscribed to. """

return (AnEvent, AnotherEvent)

Once the subscriber is implemented, you'll need to subscribe it to the event publisher.


from domain_events import Publisher


Now, in order to publish an event, just call the `publish` method on the `Publisher` with one of your domain events.

from domain_events import Event, Publisher

class AnEvent(Event):


The event will be passed on to the proper subscribers.

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