cronbit

Fastest javascript CRON implementation,
no external dependencies! Pure javascript.

The library is implemented with speed in mind. For
condition checking - bitwise operations are used.
Each minute, hour, dom, month, dow is represented
by one bit, this makes condition checking really fast.

It can easily handle thousands of CRON Jobs at once.

For the speed boost the module is made to work with server time.

Install

npm install cronbit

CRON

           ┌───────────── min (0 - 59)
           │ ┌────────────── hour (0 - 23)
           │ │ ┌─────────────── day of month (1 - 31)
           │ │ │ ┌──────────────── month (1 - 12)
           │ │ │ │ ┌───────────────── day of week (0 - 6) (0 to 6 are Sunday to
           │ │ │ │ │                  Saturday, or use names; 7 is also Sunday)
           │ │ │ │ │
           │ │ │ │ │
cron.init("* * * * *", calllback)

Available Cron patterns:

Asterisk. E.g. *
Ranges. E.g. 1-3
Steps. E.g. */2
Lists, E.g. 1,2,3,6,7,9

Simple Example

var cronbit = require("cronbit");

var cron = new cronbit.CronJob();

cron.init("* * * * *", function() {
	console.log("execute each minute");
});

cron.init("*/5 * * * *", function() {
	console.log("execute each 5 minutes");
});

Module methods that can be used for self made CRON logic

Generates bit-mask array from CRON string ("*/5 * * * *").

/**
 * Make bit-mask array
 * @param  {string} str [cron syntax string]
 * @return {object}
 */
cronbit.make(cronString);

Checks already generated bitMaskArr to timeArr.

/**
 * Check bit-masks of cron condition to bit-mask of current/given time.
 *
 * @param  {array} bitmask [array length 5 of integers]
 * @param  {array} time    [array length 5 of integers] optional, defaults to current time
 * @return {boolean}
 */
cronbit.check(bitMaskArr, timeArr);

Helpers:

// set bit at current position
cronbit.helpers.setBit(num, bit);

// get bit at current position
cronbit.helpers.getBit(num, bit);

// check two bit arrays for complete match
cronbit.helpers.bitMatch(bitArrMask1, bitArrMask2);

// generates bit-mask timeArr
cronbit.helpers.getTimeArray();