stync

Ever have this happen? You've got a bunch of asynchronous code that includes logging, and it gets all jumbled because your callbacks fire in non-deterministic order?

This is just a little library to make things a little bit more orderly.

Usage

var stync = require('stync');

doInParallel([url1, url2, url3], function(url) {
  var message = stync.begin('Fetching ' + url + '...');

  fetchUrl(url, function(response) {
    message.write(' received response...');

    response.readAsync(function(data) {
      message.end(' Finished!');
    });
  });
});

In the above example, suppose the three URLs are requested in order, and a response is received from the last URL first. Everything will still display properly because each message does not write itself to process.stdout until its predecessor has called end. In effect, messages "wait their turn" so that line-by-line the console output makes sense.