subscribe(pattern = nil, callable = nil, monotonic: false, &block) public

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# File activesupport/lib/active_support/notifications/fanout.rb, line 24
      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
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