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This is a default queue implementation that ships with Notifications. It just pushes events to all registered log subscribers.

This class is thread safe. All methods are reentrant.

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Methods
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Included Modules
Class Public methods
new()
# File activesupport/lib/active_support/notifications/fanout.rb, line 16
def initialize
  @string_subscribers = Hash.new { |h, k| h[k] = [] }
  @other_subscribers = []
  @listeners_for = Concurrent::Map.new
  super
end
Instance Public methods
finish(name, id, payload, listeners = listeners_for(name))
# File activesupport/lib/active_support/notifications/fanout.rb, line 61
def finish(name, id, payload, listeners = listeners_for(name))
  listeners.each { |s| s.finish(name, id, payload) }
end
listeners_for(name)
# File activesupport/lib/active_support/notifications/fanout.rb, line 69
def listeners_for(name)
  # this is correctly done double-checked locking (Concurrent::Map's lookups have volatile semantics)
  @listeners_for[name] || synchronize do
    # use synchronisation when accessing @subscribers
    @listeners_for[name] ||=
      @string_subscribers[name] + @other_subscribers.select { |s| s.subscribed_to?(name) }
  end
end
listening?(name)
# File activesupport/lib/active_support/notifications/fanout.rb, line 78
def listening?(name)
  listeners_for(name).any?
end
publish(name, *args)
# File activesupport/lib/active_support/notifications/fanout.rb, line 65
def publish(name, *args)
  listeners_for(name).each { |s| s.publish(name, *args) }
end
start(name, id, payload)
# File activesupport/lib/active_support/notifications/fanout.rb, line 57
def start(name, id, payload)
  listeners_for(name).each { |s| s.start(name, id, payload) }
end
subscribe(pattern = nil, callable = nil, monotonic: false, &block)
# File activesupport/lib/active_support/notifications/fanout.rb, line 23
def subscribe(pattern = nil, callable = nil, monotonic: false, &block)
  subscriber = Subscribers.new(pattern, callable || block, monotonic)
  synchronize do
    if String === pattern
      @string_subscribers[pattern] << subscriber
      @listeners_for.delete(pattern)
    else
      @other_subscribers << subscriber
      @listeners_for.clear
    end
  end
  subscriber
end
unsubscribe(subscriber_or_name)
# File activesupport/lib/active_support/notifications/fanout.rb, line 37
def unsubscribe(subscriber_or_name)
  synchronize do
    case subscriber_or_name
    when String
      @string_subscribers[subscriber_or_name].clear
      @listeners_for.delete(subscriber_or_name)
      @other_subscribers.each { |sub| sub.unsubscribe!(subscriber_or_name) }
    else
      pattern = subscriber_or_name.try(:pattern)
      if String === pattern
        @string_subscribers[pattern].delete(subscriber_or_name)
        @listeners_for.delete(pattern)
      else
        @other_subscribers.delete(subscriber_or_name)
        @listeners_for.clear
      end
    end
  end
end
wait()

This is a sync queue, so there is no waiting.

# File activesupport/lib/active_support/notifications/fanout.rb, line 83
def wait
end