# File actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb, line 8
def initialize
  @subscribers = Hash.new { |h, k| h[k] = [] }
  @sync = Mutex.new
end

# File actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb, line 49
def add_channel(channel, on_success)
  on_success.call if on_success
end

# File actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb, line 13
def add_subscriber(channel, subscriber, on_success)
  @sync.synchronize do
    new_channel = !@subscribers.key?(channel)

    @subscribers[channel] << subscriber

    if new_channel
      add_channel channel, on_success
    elsif on_success
      on_success.call
    end
  end
end

# File actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb, line 38
def broadcast(channel, message)
  list = @sync.synchronize do
    return if !@subscribers.key?(channel)
    @subscribers[channel].dup
  end

  list.each do |subscriber|
    invoke_callback(subscriber, message)
  end
end

# File actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb, line 56
def invoke_callback(callback, message)
  callback.call message
end

# File actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb, line 53
def remove_channel(channel)
end

# File actioncable/lib/action_cable/subscription_adapter/subscriber_map.rb, line 27
def remove_subscriber(channel, subscriber)
  @sync.synchronize do
    @subscribers[channel].delete(subscriber)

    if @subscribers[channel].empty?
      @subscribers.delete channel
      remove_channel channel
    end
  end
end