relu-core/modules/rp/examples/stream.js

Core for bot

var rp = require("../");
var base = require("../lib/base");

function stream() {
	// fake stream
	var a = {
		send: function(msg) {
			process.nextTick(function() {
				console.log("stream a -> b: ", msg);
				b.onmessage(JSON.stringify(msg));
			});
		},
		onmessage: function() {}
	};
	var b = {
		send: function(msg) {
			process.nextTick(function() {
				console.log("stream b -> a: ", msg);
				a.onmessage(JSON.stringify(msg));
			});
		},
		onmessage: function() {}
	};
	return [a, b];
}

function withPauses() {
	var x = [].slice.call(arguments);
	var y = x.shift();
	if(!y) return;
	y();
	process.nextTick(function() {
		withPauses.apply(null, x);
	});
}

function synchronizedRp(stream) {
	var p = rp.variable();
	
	var remoteChange = false;
	p.onUpdated(function(v) {
		if(remoteChange) return;
		stream.send(["updated", v]);
	});
	p.onAdded(function(i, v) {
		if(remoteChange) return;
		stream.send(["added", i, v]);
	});
	p.onRemoved(function(i) {
		if(remoteChange) return;
		stream.send(["removed", i]);
	});
	p.onNested(function(e, p, a, b) {
		if(remoteChange) return;
		stream.send([p, e, a, b]);
	});
	stream.onmessage = function(msg) {
		msg = JSON.parse(msg);
		remoteChange = true;
		var changedProperty = p;
		if(Array.isArray(msg[0])) {
			changedProperty = p.g.apply(p, msg[0]);
			msg = msg.slice(1);
		}
		switch(msg[0]) {
		case "updated":
			changedProperty.set(msg[1]);
			break;
		case "added":
			changedProperty.splice(msg[1], 0, msg[2]);
			break;
		case "removed":
			changedProperty.splice(msg[1], 1);
			break;
		}
		remoteChange = false;
	};
	return p;
}


var streams = stream();

var a = synchronizedRp(streams[0]).scope();

var b = synchronizedRp(streams[1]).scope();

withPauses(function() {

	a.set(123);

}, function() {

	console.log(b());
	// logs: 123

	a.set([1, 2, {a: 3}]);

}, function() {

	console.log(b());
	// logs: [1, 2, {a: 3}]

	console.log(b.shift());
	// logs: 1

}, function() {

	console.log(a());
	// logs: [2, {a: 3}]

	a(1, "a").set(4);

}, function() {

	console.log(b());
	// logs: [2, {a: 4}]

});