# config/initializers/wisper.rb
Wisper.configure do |config|
  config.broadcaster :default, Wisper::Broadcasters::LoggerBroadcaster.new(
    Rails.logger,
    Wisper::Broadcasters::SendBroadcaster.new
  )
end

# config/initializers/listeners.rb
Rails.application.config.to_prepare do
  Wisper.clear if Rails.env.development? || Rails.env.test?

  Wisper.subscribe(UserCreatedEventHandler, on: :user_created, with: :call)
end

# app/event_handlers/user_created_event_handler.rb
class UserCreatedEventHandler
  def self.call(user)
    p('created!!!')
  end
end

# app/models/user.rb
class User < ApplicationRecord
  include Wisper::Publisher

   def do_broadcast
    broadcast(:user_created, self)
  end
end

user = User.first
user.do_broadcast
# Observed log message:
# [WISPER] User#1 published call to UserCreatedEventHandler#104080 with User#1