Class: Aggro::EventBus

Inherits:
Object
  • Object
show all
Defined in:
lib/aggro/event_bus.rb

Overview

Public: Publishes events to any subscribed listeners.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ EventBus

Returns a new instance of EventBus.



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# File 'lib/aggro/event_bus.rb', line 6

def initialize
  @remote_publishers = {}
end

Instance Attribute Details

#remote_publishers ⇒ Object (readonly)

Returns the value of attribute remote_publishers.



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# File 'lib/aggro/event_bus.rb', line 4

def remote_publishers
  @remote_publishers
end

Instance Method Details

#publish(topic, event) ⇒ Object 



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# File 'lib/aggro/event_bus.rb', line 10

def publish(topic, event)
  Aggro.server.publish Message::Events.new(topic, [event])

  return unless subscriptions.key? topic

  subscriptions[topic].each do |subscription|
    sleep 0.01 until subscription.caught_up
    subscription.handle_event event
  end
end

#shutdown ⇒ Object 



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# File 'lib/aggro/event_bus.rb', line 39

def shutdown
  remote_publishers.values.each(&:stop)
end

#subscribe(topic, subscriber, event_namespace = nil, filters = {}) ⇒ Object 



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# File 'lib/aggro/event_bus.rb', line 21

def subscribe(topic, subscriber, event_namespace = nil, filters = {})
  subscription = Subscription.new(topic, subscriber, event_namespace,
                                  filters, 0)

  catchup_subscriber topic, subscription

  subscriptions[topic] ||= []
  subscriptions[topic] << subscription

  subscribe_bus_to_publisher topic

  subscription
end

#unsubscribe(topic, subscriber) ⇒ Object 



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# File 'lib/aggro/event_bus.rb', line 35

def unsubscribe(topic, subscriber)
  subscriptions[topic].delete subscriber
end