Class: Synapse::EventBus::SimpleEventBus
- Defined in:
- lib/synapse/event_bus/simple_event_bus.rb
Overview
Implementation of an event bus that notifies any subscribed event listeners in the calling thread. Listeners are expected to implement asynchronous handing themselves, if desired.
Instance Method Summary collapse
-
#initialize ⇒ SimpleEventBus
constructor
A new instance of SimpleEventBus.
- #publish(*events) ⇒ undefined
- #subscribe(listener) ⇒ undefined
-
#subscribed?(listener) ⇒ Boolean
Returns true if the given listener is subscribed to this event bus.
- #unsubscribe(listener) ⇒ undefined
Constructor Details
#initialize ⇒ SimpleEventBus
Returns a new instance of SimpleEventBus.
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# File 'lib/synapse/event_bus/simple_event_bus.rb', line 6 def initialize @listeners = Set.new @logger = Logging.logger[self.class] end |
Instance Method Details
#publish(*events) ⇒ undefined
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# File 'lib/synapse/event_bus/simple_event_bus.rb', line 14 def publish(*events) return if @listeners.empty? events.flatten! events.each do |event| @listeners.each do |listener| @logger.debug 'Dispatching event [%s] to listener [%s]' % [event.payload_type, listener.class] listener.notify event end end end |
#subscribe(listener) ⇒ undefined
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# File 'lib/synapse/event_bus/simple_event_bus.rb', line 40 def subscribe(listener) if @listeners.add? listener @logger.debug 'Event listener [%s] subscribed' % listener.class else @logger.info 'Event listener [%s] not added, was already subscribed' % listener.class end end |
#subscribed?(listener) ⇒ Boolean
Returns true if the given listener is subscribed to this event bus
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# File 'lib/synapse/event_bus/simple_event_bus.rb', line 33 def subscribed?(listener) @listeners.include? listener end |
#unsubscribe(listener) ⇒ undefined
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# File 'lib/synapse/event_bus/simple_event_bus.rb', line 51 def unsubscribe(listener) if @listeners.delete? listener @logger.debug 'Event listener [%s] unsubscribed' % listener.class else @logger.info 'Event listener [%s] not removed, was not subscribed' % listener.class end end |