ringbuffer.rb

class RingBuffer
  def initialize(redis=nil, list_key=nil)
    @redis = redis
  end

  def next
    JSON(@redis.rpoplpush(@list_key, @list_key))[0]
  end

  def add(item)
    @redis.lpush(@list_key, [item].to_json)
  end

  def remove(item)
    @redis.lrem(@list_key, 0, [item].to_json)
  end
end