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| require 'singleton' | |
| class Subscriber | |
| include Singleton | |
| attr_reader :subscriptions | |
| def initialize | |
| @subscriptions = {} | |
| end | |
| def subscribe(event_name, callback) | |
| subscriptions[event_name] = (subscriptions[event_name] || []).push(callback) | |
| end | |
| end | |
| class Base | |
| def self.run | |
| new.run | |
| end | |
| def self.subscribe(event) | |
| subscriber.subscribe(event, self) | |
| end | |
| def self.subscriber | |
| Subscriber.instance | |
| end | |
| def emit(event, _data = nil) | |
| Base.subscriber.subscriptions[event].each(&:run) | |
| end | |
| end | |
| class B < Base | |
| def run | |
| puts "B subscribed to event" | |
| end | |
| end | |
| class C < Base | |
| def run | |
| puts "C subscribed to event" | |
| end | |
| end | |
| class A < Base | |
| def run | |
| while true | |
| emit(:periodic_event) | |
| sleep 5 | |
| end | |
| end | |
| end | |
| B.subscribe(:periodic_event) | |
| C.subscribe(:periodic_event) | |
| A.run |
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