Message Passing

Message_Passing.js

// Register a message handler for "some message"
messageBus.addHandler("some_message", function (message, next) { 
  // do something with the data in an async fashion
  $.get(message.url, function () { 
    if (response.code !== 200) {
      // Transition into an error state, terminates processing.
      next(new Error("bad http request!"));
    }
    else {
      // Modify the state of the object and pass execution to the next handler
      message.someState = response;
    }
  });
});

// Trigger a message...
messageBus.dispatch("some_message", function (err, message) {
  // Callback is invoked after all handlers have triggered.
  // error will be null if no error was raised.
});