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Class: ActiveSupport::Notifications::Fanout

Relationships & Source Files
Namespace Children
Modules:
Subscribers
Classes:
Handle
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 50



def initialize
  @mutex = Mutex.new
  @string_subscribers = Concurrent::Map.new { |h, k| h.compute_if_absent(k) { [] } }
  @other_subscribers = []
  @all_listeners_for = Concurrent::Map.new
  @groups_for = Concurrent::Map.new
  @silenceable_groups_for = Concurrent::Map.new
end


  







Instance Method Details



  

    #all_listeners_for(name)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 297



def all_listeners_for(name)
  # this is correctly done double-checked locking (Concurrent::Map's lookups have volatile semantics)
  @all_listeners_for[name] || @mutex.synchronize do
    # use synchronisation when accessing @subscribers
    @all_listeners_for[name] ||=
      @string_subscribers[name] + @other_subscribers.select { |s| s.subscribed_to?(name) }
  end
end


  








  

    #build_handle(name, id, payload)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 272



def build_handle(name, id, payload)
  Handle.new(self, name, id, payload)
end


  








  

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

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 283



def finish(name, id, payload, listeners = nil)
  handle_stack = IsolatedExecutionState[:_fanout_handle_stack]
  handle = handle_stack.pop
  handle.finish_with_values(name, id, payload)
end


  








  

    #listeners_for(name)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 306



def listeners_for(name)
  all_listeners_for(name).reject { |s| s.silenced?(name) }
end


  








  

    #listening?(name)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 310



def listening?(name)
  all_listeners_for(name).any? { |s| !s.silenced?(name) }
end


  








  

    #publish(name, *args)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 289



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


  








  

    #publish_event(event)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 293



def publish_event(event)
  iterate_guarding_exceptions(listeners_for(event.name)) { |s| s.publish_event(event) }
end


  








  

    #start(name, id, payload)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 276



def start(name, id, payload)
  handle_stack = (IsolatedExecutionState[:_fanout_handle_stack] ||= [])
  handle = build_handle(name, id, payload)
  handle_stack << handle
  handle.start
end


  








  

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

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 64



def subscribe(pattern = nil, callable = nil, monotonic: false, &block)
  subscriber = Subscribers.new(pattern, callable || block, monotonic)
  @mutex.synchronize do
    case pattern
    when String
      @string_subscribers[pattern] << subscriber
      clear_cache(pattern)
    when NilClass, Regexp
      @other_subscribers << subscriber
      clear_cache
    else
      raise ArgumentError,  "pattern must be specified as a String, Regexp or empty"
    end
  end
  subscriber
end


  








  

    #unsubscribe(subscriber_or_name)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 81



def unsubscribe(subscriber_or_name)
  @mutex.synchronize do
    case subscriber_or_name
    when String
      @string_subscribers[subscriber_or_name].clear
      clear_cache(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)
        clear_cache(pattern)
      else
        @other_subscribers.delete(subscriber_or_name)
        clear_cache
      end
    end
  end
end


  








  

    #wait  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/notifications/fanout.rb', line 315



def wait
end