def unsubscribe_all(_channel, json_data)
      log_debug "#{self.class} runs 'unsubscribe_all' method"
      CelluloidPubsub::Registry.channels.dup.pmap do |channel|
        unsubscribe_clients(channel, json_data)
      end
      log_debug 'clearing connections'
      shutdown
    end
def unsubscribe_all(_channel, json_data)
      log_debug "#{self.class} runs 'unsubscribe_all' method"
      CelluloidPubsub::Registry.channels.dup.pmap do |channel|
        unsubscribe_clients(channel, json_data)
      end
      log_debug 'clearing connections'
      shutdown
    end
unsubscribes all actors from all channels and terminates the curent actor

 @param [String] _channel NOT USED - needed to maintain compatibility with the other methods
 @param [Object] _json_data NOT USED - needed to maintain compatibility with the other methods

 @return [void]

 @api public