agenda

Agenda

Agenda is a light-weight job scheduling library for Node.js.

It offers:

• Minimal overhead. Agenda aims to keep its code base small.
• Mongo backed persistance layer.
• Scheduling with priority, repeating, and easily readable syntax.

Installation

Install via NPM

npm install agenda

Example Usage

  var agenda = new Agenda({db: { address: 'localhost:27017/agenda-example'}});

  agenda.define('delete old users', function(job, done) {
    User.remove({lastLogIn: { $lt: twoDaysAgo }}, done);
  });
  
  agenda.every('3 minutes', 'delete old users');

  agenda.define('send email report', {priority: 'high', concurrency: 10}, function(job, done) {
    var data = job.attrs.data;
    emailClient.send({ 
      to: data.to,
      from: '[e-mail]',
      subject: 'Email Report',
      body: '...'
    }
  });

  agenda.schedule('in 20 minutes', 'send email report', {to: '[e-mail]'});
  agenda.schedule('Saturday at noon', 'send email report', {to: '[e-mail]'});

Full documentation

Agenda's basic control structure is an instance of an agenda. Agenda's are mapped to a database collection and load the jobs from within.

Defining Job Processors

Before you can use a job, you must define its processing behavior.

define(jobName, [options], fn)

Defines a job with the name of jobName. When a job of job name gets run, it will be passed to fn(job, done). To maintain asynchronous behavior, you must call done() when you are processing the job.

options is an optional argument which can overwrite the defaults. It can take the following:

• concurrency: number maxinum number of that job that can be running at once
• priority: (lowest|low|normal|high|highest|number) specifies the priority of the job. Higher priority jobs will run first. See the priority mapping below

Priority mapping:

{
  highest: 20,
  high: 10,
  default: 0,
  low: -10,
  lowest: -20
}

Configuring an agenda

All configuration methods are chainable, meaning you can do something like:

var agenda = new Agenda();
agenda
  .database(...)
  .processEvery('3 minutes')
  ...;

database(url, [collectionName])

Specifies the database at the url specified. If no collection name is give, agendaJobs is used.

agenda.database('localhost:27017/agenda-test', 'agendaJobs');

You can also specify it during instantiation.

var agenda = new Agenda({db: { address: 'localhost:27017/agenda-test', collection: 'agendaJobs' }});

processEvery(interval)

Takes a string interval which can be either a traditional javascript number, or a string such as 3 minutes

Specifies the frequency at which agenda will query the database looking for jobs that need to be processed. If your jobs are time sensitive, you will want to specify a low value.

agenda.processEvery('1 minute');

You can also specify it during instantiation

var agenda = new Agenda({processEvery: '30 seconds'});

maxConcurrency(number)

Takes a number which specifies the max number of jobs that can be running at any given moment. By default it is 20.

agenda.maxConcurrency(20);

You can also specify it during instantiation

var agenda = new Agenda({processEvery: 20});

defaultConcurrency(number)

Takes a number which specifies the default number of a specific that can be running at any given moment. By default it is 5.

agenda.defaultConcurrency(5);

You can also specify it during instantiation

var agenda = new Agenda({defaultConcurrency: 5});

License

(The MIT License)

Copyright (c) 2013 Ryan Schmukler [e-mail]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.