#!/usr/bin/env ruby<\/span>\n\nrequire<\/span> 'rubygems'<\/span>\nrequire<\/span> 'eventmachine'<\/span>\n\nmodule<\/span> Chat<\/span>\n\n  # Called after the connection with a client has been established<\/span>\n  def<\/span> post_init<\/span>\n    # Add ourselves to the list of clients<\/span>\n    (<\/span>@@connections<\/span> ||=<\/span> []<\/span>)<\/span> <<<\/span> self<\/span>\n    send_data<\/span> "Please enter your name: "<\/span>\n  end<\/span>\n\n  # Called on new incoming data from the client<\/span>\n  def<\/span> receive_data<\/span> data<\/span>\n    # The first message from the user is its name<\/span>\n    @name<\/span> ||=<\/span> data<\/span>.<\/span>strip<\/span>\n\n    @@connections<\/span>.<\/span>each<\/span> do<\/span> |<\/span>client<\/span>|<\/span>\n      # Send the message from the client to all other clients<\/span>\n      client<\/span>.<\/span>send_data<\/span> "<\/span>#{<\/span>@name<\/span>}<\/span> says: <\/span>#{<\/span>data<\/span>}<\/span>"<\/span>\n    end<\/span>\n  end<\/span>\nend<\/span>\n\n# Start a server on localhost, using port 8081 and hosting our Chat application<\/span>\nEM<\/span>::<\/span>run<\/span> do<\/span>\n  EM<\/span>::<\/span>start_server<\/span> "0.0.0.0"<\/span>,<\/span> 8081<\/span>,<\/span> Chat<\/span>\nend<\/span>\n<\/pre><\/div>\n