Is it possible to have one subscription apply to multiple listeners with Wisper?

Question

I have a service that broadcast an event when some criteria is satisfied. I also have several customer specific services. I want the customer services to be notified of the event. However, I would rather not add a subscription to the broadcasting service or to an initializer each time a customer and its associated service is added. I want the broadcasting service to be unaware of the specific listeners so that we don't have to add code to that service each time a customer is added. Is there some way, I can have one subscription (either in the broadcasting service or an initializer) that can notify all customer services? This is a Ruby/Rails application and the customer services are not instantiated -- they contain class methods.

Answer 1

I solved this by iterating over all classes that are a member of my Customer module and subscribing each. This was added to application.rb.

config.after_initialize do
  Customer.constants.select { |c| Customer.const_get(c).is_a? Class }
          .map { |klass| 'Customer::' + klass.to_s }
          .each { |klass| ScanEventService.subscribe(klass.constantize) }
end

Each time I add a new customer service, I make it a member of this module.