Package Exports

promise-queue

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Readme

promise-queue

Promise-based queue

Installation

promise-queue can be installed using npm:

npm install promise-queue

Example

Configure queue

By default Queue tries to use global Promises, but you can specify your own promises.

Queue.configure(require('vow').Promise);

Or use old-style promises approach:

Queue.configure(function (handler) {
    var dfd = $.Deferred();
    try {
        handler(dfd.resolve, dfd.reject, dfd.notify);
    } catch (e) {
        dfd.reject(e);
    }
    return dfd.promise();
});

Queue one by one example

var maxConcurrent = 1;
var maxQueue = Infinity;
var queue = new Queue(maxConcurrent, maxQueue);

app.get('/version/:user/:repo', function (req, res, next) {
    queue.add(function () {
        // Assume that this action is a way too expensive
        // Call of this function will be delayed on second request
        return downloadTarballFromGithub(req.params);
    })
    .then(parseJson('package.json'))
    .then(function (package) {
        res.send(package.version);
    })
    .catch(next);
});

Live example