A very simple Elixir's GenServer

gen_server.rb

class Server
  def initialize
    @queue = Queue.new
  end

  def self.start
    Server.new.tap(&:start)
  end

  def start
    Thread.new do
      loop do
        process(@queue.pop)
      end
    end
  end

  def push(value)
    @queue.push(value)
    value
  end
  
  private

  def process(value)
    puts "received: #{value}"
  end
end

# s = Server.start
# => #<Server:0x00007fc71183c478 @queue=#<Thread::Queue:0x00007fc71183c3d8>>
#
# s.push(green: 1, blue: 2, white: 3)
# => {:green=>1, :blue=>2, :white=>3}
#
# received: {:green=>1, :blue=>2, :white=>3}