Restriction of requests per second

[Alberto]

How can the number of requests be limited per second?
There's a violin:

var q = items.reduce(function (prev, item) {
    return prev.then(function () {
        return $.ajax({
            dataType: 'json',
            url: 'https://example.com/method/methodOne?callback=?'
        }).then(function (results_one) {
            console.log(results_one);
            return $.ajax({
                dataType: 'json',
                url: 'https://example.com/method/methodTwo?callback=?'
            }).then(function (results_two) {   
                console.log(results_two);
            });
        });
    });
}, $.when([])); 

The number of requests should not exceed N (if the server makes a mistake).

[kalena]

1. Consider the requests launched. Like before. $.ajax() Please. requestCount += 1♪ However, requestCount must be visible from all requests;
2. Before each request, check the counter didn't exceed that threshold. If we've surpassed, we're going to pause at 1 second and then we're gonna drop the counter.

Pause can be made about:

function sleep(duration) {
    var defer = $.Deferred();
    setTimeout(function() {
        defer.resolve();
    }, duration);
    return defer.promise();
}

Result of implementation sleep() to be returned after inside the function .then()