NodeJs step by step execution my actions

I have some problem. I have mini socket server.

var net = require('net');
var server = net.createServer(function (socket) {
    socket.on('data', function(data){
        // here i do xml parsing and run some action
        var xml2js = require('xml2js'), parser = new xml2js.Parser();
        parser.addListener('end', function(result) {
            var command = require(result['@']['action']);
            var c = new command(socket);
            c.run();
        }).parseString(data);
    });
});        
server.listen('8081', '127.0.0.1');

Good, but if i send many commands to server like this:

telnet 127.0.0.1 8081
<query action="some_action1"></query>
<query action="some_action2"></query>
<query action="some_action3"></query>

My server is executing this action is asynchronous. How i can get running this actions is step by step ?