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Class: ActiveSupport::Notifications::Fanout

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, Mutex_m
Inherits: Object
Defined in: activesupport/lib/active_support/notifications/fanout.rb

Overview

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

This class is thread safe. All methods are reentrant.

Class Method Summary

Instance Method Summary

Constructor Details

.new ⇒ Fanout

[ GitHub ] 

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 15



def initialize
  @subscribers = []
  @listeners_for = Concurrent::Map.new
  super
end


  







Instance Method Details



  

    #finish(name, id, payload, listeners = listeners_for(name))  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 47



def finish(name, id, payload, listeners = listeners_for(name))
  listeners.each { |s| s.finish(name, id, payload) }
end


  








  

    #listeners_for(name)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 55



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] ||= @subscribers.select { |s| s.subscribed_to?(name) }
  end
end


  








  

    #listening?(name)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 63



def listening?(name)
  listeners_for(name).any?
end


  








  

    #publish(name, *args)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 51



def publish(name, *args)
  listeners_for(name).each { |s| s.publish(name, *args) }
end


  








  

    #start(name, id, payload)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 43



def start(name, id, payload)
  listeners_for(name).each { |s| s.start(name, id, payload) }
end


  








  

    #subscribe(pattern = nil, callable = nil, &block)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 21



def subscribe(pattern = nil, callable = nil, &block)
  subscriber = Subscribers.new(pattern, callable || block)
  synchronize do
    @subscribers << subscriber
    @listeners_for.clear
  end
  subscriber
end


  








  

    #unsubscribe(subscriber_or_name)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 30



def unsubscribe(subscriber_or_name)
  synchronize do
    case subscriber_or_name
    when String
      @subscribers.reject! { |s| s.matches?(subscriber_or_name) }
    else
      @subscribers.delete(subscriber_or_name)
    end

    @listeners_for.clear
  end
end


  








  

    #wait  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 68



def wait
end