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promise-queue [![NPM Version](https://badge.fury.io/js/promise-queue.png)](https://npmjs.org/package/promise-queue) [![Build Status](https://travis-ci.org/azproduction/promise-queue.png?branch=master)](https://travis-ci.org/azproduction/promise-queue) [![Coverage Status](https://coveralls.io/repos/azproduction/promise-queue/badge.png?branch=master)](https://coveralls.io/r/azproduction/promise-queue) [![Dependency Status](https://gemnasium.com/azproduction/promise-queue.png)](https://gemnasium.com/azproduction/promise-queue)\n\nPromise-based queue\n\n## Installation\n\n`promise-queue` can be installed using `npm`:\n\n```\nnpm install promise-queue\n```\n\n## Interface\n\n - `new Queue(Number maxConcurrent, Number maxQueued): Queue`\n - `Queue#add(Function generator): Promise` - adds function argument that generates a promise to the queue\n - `Queue#getQueueLength(): Number` - returns current length of buffer(added but not started promise generators) `it <= maxQueued`\n - `Queue#getPendingLength(): Number` - returns number of pending(concurrently running) promises `it <= maxConcurrent`\n\n## Example\n\n### Configure queue\n\nBy default `Queue` tries to use global Promises, but you can specify your own promises.\n\n```js\nQueue.configure(require('vow').Promise);\n```\n\nOr use old-style promises approach:\n\n```js\nQueue.configure(function (handler) {\n    var dfd = $.Deferred();\n    try {\n        handler(dfd.resolve, dfd.reject, dfd.notify);\n    } catch (e) {\n        dfd.reject(e);\n    }\n    return dfd.promise();\n});\n```\n\n### Queue one by one example\n\n```js\nvar maxConcurrent = 1;\nvar maxQueue = Infinity;\nvar queue = new Queue(maxConcurrent, maxQueue);\n\napp.get('/version/:user/:repo', function (req, res, next) {\n    queue.add(function () {\n        // Assume that this action is a way too expensive\n        // Call of this function will be delayed on second request\n        return downloadTarballFromGithub(req.params);\n    })\n    .then(parseJson('package.json'))\n    .then(function (package) {\n        res.send(package.version);\n    })\n    .catch(next);\n});\n```\n\n### Getting number of pending promises and queue(buffered promises) length\n\n```js\nvar maxConcurrent = 1;\nvar maxQueue = 1;\nvar queue = new Queue(maxConcurrent, maxQueue);\n\nqueue.add(function () {\n    queue.getQueueLength() === 0;\n    queue.getPendingLength() === 1;\n    return somePromise();\n});\n\nqueue.add(function () {\n    queue.getQueueLength() === 0;\n    queue.getPendingLength() === 0;\n    return somePromise();\n});\n\nqueue.getQueueLength() === 1;\nqueue.getPendingLength() === 1;\n```\n\n[Live example](http://jsfiddle.net/RVuEU/1/)\n","maintainers":[{"name":"azproduction","email":"azazel.private@gmail.com"}],"time":{"modified":"2022-06-24T18:59:49.917Z","created":"2013-12-16T11:37:36.304Z","1.0.0":"2013-12-16T11:37:40.498Z","1.0.1":"2014-02-19T12:42:55.117Z","2.0.0":"2014-03-09T18:33:44.178Z","2.0.1":"2014-07-09T09:20:17.303Z","2.1.1":"2014-07-09T12:26:21.074Z","2.1.2":"2015-10-30T08:56:12.275Z","2.2.0":"2015-11-24T19:47:38.859Z","2.2.1":"2016-01-05T16:39:40.653Z","2.2.2":"2016-01-05T16:53:27.612Z","2.2.3":"2016-02-10T23:15:32.740Z","2.2.4":"2018-01-28T21:57:33.389Z","2.2.5":"2018-01-28T22:19:15.502Z"},"author":{"name":"Mikhail Davydov","email":"i@azproduction.ru"},"readmeFilename":"README.md","contributors":[{"name":"Mikhail 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