docs/agenda/2.0.0/agenda_find-and-lock-next-job.js.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>
agenda/find-and-lock-next-job.js - Documentation
</title>
<link href="https://www.braintreepayments.com/images/favicon-ccda0b14.png" rel="icon" type="image/png">
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.7.2/highlight.min.js"></script>
<script>hljs.initHighlightingOnLoad();</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
<link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
<!-- start Mixpanel -->
<script type="text/javascript">(function(e,a){if(!a.__SV){var b=window;try{var c,l,i,j=b.location,g=j.hash;c=function(a,b){return(l=a.match(RegExp(b+"=([^&]*)")))?l[1]:null};g&&c(g,"state")&&(i=JSON.parse(decodeURIComponent(c(g,"state"))),"mpeditor"===i.action&&(b.sessionStorage.setItem("_mpcehash",g),history.replaceState(i.desiredHash||"",e.title,j.pathname+j.search)))}catch(m){}var k,h;window.mixpanel=a;a._i=[];a.init=function(b,c,f){function e(b,a){var c=a.split(".");2==c.length&&(b=b[c[0]],a=c[1]);b[a]=function(){b.push([a].concat(Array.prototype.slice.call(arguments,
0)))}}var d=a;"undefined"!==typeof f?d=a[f]=[]:f="mixpanel";d.people=d.people||[];d.toString=function(b){var a="mixpanel";"mixpanel"!==f&&(a+="."+f);b||(a+=" (stub)");return a};d.people.toString=function(){return d.toString(1)+".people (stub)"};k="disable time_event track track_pageview track_links track_forms register register_once alias unregister identify name_tag set_config reset people.set people.set_once people.increment people.append people.union people.track_charge people.clear_charges people.delete_user".split(" ");
for(h=0;h<k.length;h++)e(d,k[h]);a._i.push([b,c,f])};a.__SV=1.2;b=e.createElement("script");b.type="text/javascript";b.async=!0;b.src="undefined"!==typeof MIXPANEL_CUSTOM_LIB_URL?MIXPANEL_CUSTOM_LIB_URL:"file:"===e.location.protocol&&"//cdn.mxpnl.com/libs/mixpanel-2-latest.min.js".match(/^\/\//)?"https://cdn.mxpnl.com/libs/mixpanel-2-latest.min.js":"//cdn.mxpnl.com/libs/mixpanel-2-latest.min.js";c=e.getElementsByTagName("script")[0];c.parentNode.insertBefore(b,c)}})(document,window.mixpanel||[]);
mixpanel.init("1919205b2da72e4da3b9b6639b444d59");</script>
<!-- end Mixpanel -->
</head>
<body>
<svg style="display: none;">
<defs>
<symbol id="linkIcon" fill="#706d77" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
<path d="M0 0h24v24H0z" fill="none"/>
<path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"/>
</symbol>
</defs>
</svg>
<input type="checkbox" id="nav-trigger" class="nav-trigger" />
<label for="nav-trigger" class="navicon-button x">
<div class="navicon"></div>
</label>
<label for="nav-trigger" class="overlay"></label>
<div class="top-nav-wrapper">
<ul>
<li >
<a href="index.html">
<svg fill="#6D6D6D" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
<path d="M10 20v-6h4v6h5v-8h3L12 3 2 12h3v8z"/>
<path d="M0 0h24v24H0z" fill="none"/>
</svg>
</a>
</li>
</ul>
</div>
<nav>
<h3 class="reference-title">
Agenda
</h3>
<h3>Classes</h3><ul><li id="Agenda-nav"><a href="Agenda.html">Agenda</a><ul class='methods'><li data-type="method" id="Agenda-cancel-nav"><a href="Agenda.html#cancel">cancel</a></li><li data-type="method" id="Agenda-create-nav"><a href="Agenda.html#create">create</a></li><li data-type="method" id="Agenda-database-nav"><a href="Agenda.html#database">database</a></li><li data-type="method" id="Agenda-dbInit-nav"><a href="Agenda.html#dbInit">dbInit</a></li><li data-type="method" id="Agenda-defaultConcurrency-nav"><a href="Agenda.html#defaultConcurrency">defaultConcurrency</a></li><li data-type="method" id="Agenda-defaultLockLifetime-nav"><a href="Agenda.html#defaultLockLifetime">defaultLockLifetime</a></li><li data-type="method" id="Agenda-defaultLockLimit-nav"><a href="Agenda.html#defaultLockLimit">defaultLockLimit</a></li><li data-type="method" id="Agenda-define-nav"><a href="Agenda.html#define">define</a></li><li data-type="method" id="Agenda-every-nav"><a href="Agenda.html#every">every</a></li><li data-type="method" id="Agenda-findAndLockNextJob-nav"><a href="Agenda.html#findAndLockNextJob">findAndLockNextJob</a></li><li data-type="method" id="Agenda-jobs-nav"><a href="Agenda.html#jobs">jobs</a></li><li data-type="method" id="Agenda-locklimit-nav"><a href="Agenda.html#locklimit">locklimit</a></li><li data-type="method" id="Agenda-maxConcurrency-nav"><a href="Agenda.html#maxConcurrency">maxConcurrency</a></li><li data-type="method" id="Agenda-mongo-nav"><a href="Agenda.html#mongo">mongo</a></li><li data-type="method" id="Agenda-name-nav"><a href="Agenda.html#name">name</a></li><li data-type="method" id="Agenda-now-nav"><a href="Agenda.html#now">now</a></li><li data-type="method" id="Agenda-processEvery-nav"><a href="Agenda.html#processEvery">processEvery</a></li><li data-type="method" id="Agenda-purge-nav"><a href="Agenda.html#purge">purge</a></li><li data-type="method" id="Agenda-saveJob-nav"><a href="Agenda.html#saveJob">saveJob</a></li><li data-type="method" id="Agenda-schedule-nav"><a href="Agenda.html#schedule">schedule</a></li><li data-type="method" id="Agenda-sort-nav"><a href="Agenda.html#sort">sort</a></li><li data-type="method" id="Agenda-start-nav"><a href="Agenda.html#start">start</a></li><li data-type="method" id="Agenda-stop-nav"><a href="Agenda.html#stop">stop</a></li></ul></li><li id="Job-nav"><a href="Job.html">Job</a><ul class='methods'><li data-type="method" id="Job-computeNextRunAt-nav"><a href="Job.html#computeNextRunAt">computeNextRunAt</a></li><li data-type="method" id="Job-disable-nav"><a href="Job.html#disable">disable</a></li><li data-type="method" id="Job-enable-nav"><a href="Job.html#enable">enable</a></li><li data-type="method" id="Job-fail-nav"><a href="Job.html#fail">fail</a></li><li data-type="method" id="Job-isRunning-nav"><a href="Job.html#isRunning">isRunning</a></li><li data-type="method" id="Job-priority-nav"><a href="Job.html#priority">priority</a></li><li data-type="method" id="Job-remove-nav"><a href="Job.html#remove">remove</a></li><li data-type="method" id="Job-repeatAt-nav"><a href="Job.html#repeatAt">repeatAt</a></li><li data-type="method" id="Job-repeatEvery-nav"><a href="Job.html#repeatEvery">repeatEvery</a></li><li data-type="method" id="Job-run-nav"><a href="Job.html#run">run</a></li><li data-type="method" id="Job-schedule-nav"><a href="Job.html#schedule">schedule</a></li><li data-type="method" id="Job-toJSON-nav"><a href="Job.html#toJSON">toJSON</a></li><li data-type="method" id="Job-touch-nav"><a href="Job.html#touch">touch</a></li><li data-type="method" id="Job-unique-nav"><a href="Job.html#unique">unique</a></li></ul></li></ul><h3 id="global-nav">Global</h3><ul><li><a href="global.html#parsePriority">parsePriority</a></li></ul>
</nav>
<div id="main">
<h1 class="page-title">
agenda/find-and-lock-next-job.js
</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>'use strict';
const debug = require('debug')('agenda:internal:_findAndLockNextJob');
const utils = require('../utils');
const createJob = utils.createJob;
/**
* Find and lock jobs
* @name Agenda#findAndLockNextJob
* @function
* @param {String} jobName name of job to try to lock
* @param {Object} definition definition used to tell how job is run
* @param {Function} cb called when job lock fails or passes
* @access protected
* @caller jobQueueFilling() only
* @returns {undefined}
*/
module.exports = function(jobName, definition, cb) {
const self = this;
const now = new Date();
const lockDeadline = new Date(Date.now().valueOf() - definition.lockLifetime);
debug('_findAndLockNextJob(%s, [Function], cb)', jobName);
// Don't try and access MongoDB if we've lost connection to it.
// Trying to resolve crash on Dev PC when it resumes from sleep. NOTE: Does this still happen?
const s = this._mdb.s || this._mdb.db.s;
if (s.topology.connections().length === 0) {
if (s.topology.autoReconnect && !s.topology.isDestroyed()) {
// Continue processing but notify that Agenda has lost the connection
debug('Missing MongoDB connection, not attempting to find and lock a job');
self.emit('error', new Error('Lost MongoDB connection'));
cb();
} else {
// No longer recoverable
debug('topology.autoReconnect: %s, topology.isDestroyed(): %s', s.topology.autoReconnect, s.topology.isDestroyed());
cb(new Error('MongoDB connection is not recoverable, application restart required'));
}
} else {
// /**
// * Query used to find job to run
// * @type {{$or: [*]}}
// */
const JOB_PROCESS_WHERE_QUERY = {
$or: [{
name: jobName,
lockedAt: null,
nextRunAt: {$lte: this._nextScanAt},
disabled: {$ne: true}
}, {
name: jobName,
lockedAt: {$exists: false},
nextRunAt: {$lte: this._nextScanAt},
disabled: {$ne: true}
}, {
name: jobName,
lockedAt: {$lte: lockDeadline},
disabled: {$ne: true}
}]
};
/**
* Query used to set a job as locked
* @type {{$set: {lockedAt: Date}}}
*/
const JOB_PROCESS_SET_QUERY = {$set: {lockedAt: now}};
/**
* Query used to affect what gets returned
* @type {{returnOriginal: boolean, sort: object}}
*/
const JOB_RETURN_QUERY = {returnDocument: 'after', sort: this._sort};
// Find ONE and ONLY ONE job and set the 'lockedAt' time so that job begins to be processed
this._collection.findOneAndUpdate(JOB_PROCESS_WHERE_QUERY, JOB_PROCESS_SET_QUERY, JOB_RETURN_QUERY, (err, result) => {
let job;
if (!err && result.value) {
debug('found a job available to lock, creating a new job on Agenda with id [%s]', result.value._id);
job = createJob(self, result.value);
}
if (err) {
debug('error occurred when running query to find and lock job');
}
cb(err, job);
});
}
};
</code></pre>
</article>
</section>
</div>
<br class="clear">
<footer>
Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.5</a>
</footer>
<script src="scripts/linenumber.js"></script>
<script src="scripts/pagelocation.js"></script>
</body>
</html>