ScheduleService.js

var schedule = require('node-schedule');

var ScheduleService = (function () {
  var instance;
  function init() {
    //
    // *    *    *    *    *    *
    // ┬    ┬    ┬    ┬    ┬    ┬
    // │    │    │    │    │    |
    // │    │    │    │    │    └ day of week (0 - 7) (0 or 7 is Sun)
    // │    │    │    │    └───── month (1 - 12)
    // │    │    │    └────────── day of month (1 - 31)
    // │    │    └─────────────── hour (0 - 23)
    // │    └──────────────────── minute (0 - 59)
    // └───────────────────────── second (0 - 59, OPTIONAL)
    //
    // Every 1 minute	* * * * *
    // Every 15 minutes	*/15 * * * *
    // Every 30 minutes	*/30 * * * *
    // Every 1 hour	0 * * * *
    // Every 6 hours	0 */6 * * *
    // Every 12 hours	0 */12 * * *
    // Once a day	4 0 * * *
    // Once a week	4 0 * * 0
    // Once a month	4 0 1 * *
    // Here is a diagram of the general crontab syntax, for illustration:
    //
    // # +---------------- minute (0 - 59)
    // # |  +------------- hour (0 - 23)
    // # |  |  +---------- day of month (1 - 31)
    // # |  |  |  +------- month (1 - 12)
    // # |  |  |  |  +---- day of week (0 - 6) (Sunday=0)
    // # |  |  |  |  |
    //   *  *  *  *  *  command to be executed
    //

    var allScheduleJobs = [];
    var getAllJobs = function() {
      return allScheduleJobs;
    }
    var createJobForEveryHour = function(name,cb) {
      var job = schedule.scheduleJob('0 * * * *',cb);
      allScheduleJobs.push({name:name,date:date,jobId:job});
      return job;
    }
    var createJobForEveryDay = function(cb) {
      var job = schedule.scheduleJob('4 0 * * *',cb);
      allScheduleJobs.push({name:name,date:date,jobId:job});
      return job;
    }
    var createJob = function(name,date,cb) {
      var job = schedule.scheduleJob(date,cb);
      allScheduleJobs.push({name:name,date:date,jobId:job});
      return job;
    }
    var cancelJobByName = function(name) {
      if (allScheduleJobs.length === 0) return;
      allScheduleJobs.forEach(function(job) {
        if (job.name === name) {
          job.jobId.cancel();
        }
      })
    }
    var cancelJob = function(jobId) {
      jobId.cancel();
    }
    //Public Method
    return {
      createJob:createJob,
      cancelJob:cancelJob,
      createJobForEveryHour:createJobForEveryHour,
      createJobForEveryDay:createJobForEveryDay,

      getAllJobs:getAllJobs
    };

  };

  return {
    getInstance: function () {
      if ( !instance ) {
        instance = init();
      }
      return instance;
    }
  };

})();

module.exports = ScheduleService;
//
// How to Use the Module
//
// var Util = require('./Utilities');
// var ScheduleService = require('./ScheduleService');
// var mySS = ScheduleService.getInstance();
//
// mySS.createJob('everyMin','* * * * *',function(){
//   console.log(Util.getISO8601NowStr());
// })
// console.log(mySS.getAllJobs());