A JavaScript homage to the Dartlang Completer API.
Using it is simple. You create an asynchronous function of some sort. This function creates a Completer which you use to track your progress, and eventually complete the operation. From this funciton, return a future.
var MyObj = function() {
var _completer;
// The asynchronous action performed
this.startAsync = function(arg1, arg2) {
_completer = new future.Completer();
return _completer.future();
};
// Complete the action (perhaps as a callback)
this.endAsync = function() {
_completer.complete("SUCCESS", "CODE 9");
};
};
Code wishing to monitor the progress of the function can then use a really slick API to monitor your progress.
var my_obj = new MyObj();
function handle_completion() {
say("This is so awesome that we're done!");
}
function do_other_stuff(msg, code) {
say("More incredible things happened, '" + msg + "'");
}
// Note we're saving the future for later use
var future =
my_obj.startAsync().then(handle_completion).then(do_other_stuff);
// Completing the asynchronous funtion calls all our handlers
my_obj.endAsync();
You're handlers will be called with the same arguments as to complete.
You can even add handlers after your work is done as long as you kept a reference to the future.
future.then(function() {
say("We're calling this handler immediately since the operation is done.");
});
There's lots more you can do with this, including handling exceptions. For more examples check out the /spec/future-spec.js or index.html.
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