isottope

isottope

Is an Event Loop for otto JavaScript engine, which itself is written in pure Go(ld).

Three JavaScript functions added; subscribe, unsubscribe and emit. Events can get triggered from inside both JavaScript and Go.

Not used heavily yet (just in one side project of mine), so any bug report is most appreciated.

From examples directory; you can define your own events and fire them, like this:

func customEvent(vm *otto.Otto, loop *isottope.EventLoop) {
	loop.RegisterEvent(isottope.SimpleEvent(`TEST_OK`), true)

	vm.Run(`
		function target() {
			var args = ['input args:'];
			if (arguments.length > 0) {
				for (i = 0; i < arguments.length; i++) {
					args.push(arguments[i]);
				}
			}
			var msg = args.join(' ');
			console.log(msg);
		}

		subscribe('TEST_OK', target, 'DEFAULT-ARG-1', 'DEFAULT-ARG-2');

		emit('TEST_OK', "Custome Arg");	
		emit('TEST_OK');	
	`)

	loop.Emit(`TEST_OK`, `Another Custome Arg`)
	loop.Emit(`TEST_OK`)
}

Using timers is also possible; for example:

func timer(vm *otto.Otto) {
	vm.Run(`
		var R = {};
		var c = 0;
		function target() {
			c++;
			console.log('registrar #' + c);
			if (c < 5) {
				return;
			}
			clearTimeout(R);
		}

		try {
			R = setInterval(target, 200);
		}
		catch(e) {
			console.error(e);
		}		
	`)
}

It's possible to implement more complicated event patterns by implementing isottope.Event interface - the timer itself is implemented using isottope.Event interface.