Wait for connection close and stop

gistfile1.rb

class Server
  attr_accessor :connections
  
  def initialize
    @connections = []
  end
  
  def start
    @signature = EventMachine.start_server('0.0.0.0', 3000, Connection) do |con|
      con.server = self
    end
  end
  
  def stop
    EventMachine.stop_server(@signature)
    
    unless wait_for_connections_and_stop
      # Still some connections running, schedule a check later
      EventMachine.add_periodic_timer(1) { wait_for_connections_and_stop }
    end
  end

  def wait_for_connections_and_stop
    if @connections.empty?
      EventMachine.stop
      true
    else
      puts "Waiting for #{@connections.size} connection(s) to finish ..."
      false
    end
  end
end

class Connection < EventMachine::Connection
  attr_accessor :server
  
  def unbind
    server.connections.delete(self)
  end
end

EventMachine::run {
  s = Server.new
  s.start
  puts "New server listening"
}