Updates SLAs based on a period of time

SLARunner.js

/**
 * @description Updates SLAs based on conditions and stages
 * @namespace
 * @type {Class}
 */
var SLARunner = Class.create();
SLARunner.prototype = {
	/**
 	* @description  The name of the SLA table
 	* @type {String}
 	*/
	TABLENAME: 'task_sla',
	/**
 	* @description Main method
 	* @param {Number} number How many days ago to calculate
 	*/
	run: function(number) {
		var slas = this.getNonPausedSLAs(number);
		while (slas.next()) {
			this.calculate(slas);
		}
	},
	/**
 	* @description Runs the ServiceNow SLA calculation code
 	* @param  {GlideRecord} slaRecord A task_sla record
 	*/
	calculate: function(slaRecord) {
		try {			
			SLACalculatorNG.calculateSLA(slaRecord);			
			slaRecord.stage = this.getTaskSLAStage(slaRecord);
			slaRecord.update();
		} catch (e) {
			gs.print(e);
		}
	},
	/**
 	* @description Gets SLAs that need calculating
	 * @param {Number} number How many days ago to calculate
 	* @return {GlideRecord}           Gliderecords of task_sla
 	*/
	getNonPausedSLAs: function(number) {
		var slas = new GlideRecord(this.TABLENAME);
		slas.addQuery('stage', '!=', 'paused');
		slas.addQuery('sla.collection', 'incident');
		if (number) {
			slas.addEncodedQuery('task.sys_updated_onONToday@javascript:gs.daysAgoStart(' + number + ')@javascript:gs.daysAgoEnd(0)');
		}
		slas.query();
		return slas;
	},
	/**
	 * @description Gets the appropriate stage of the Task SLA
	 * @param {GlideRecord} slaRecord The sla record
	 * @return {String} The stage of the task_sla
	 */
	getTaskSLAStage: function(slaRecord) {
		if (slaRecord.stage != 'in_progress') {
			return slaRecord.stage;
		}
		if (slaRecord.has_breached) {
			return 'breached';
		}
		if (slaRecord.end_time) {
			return 'achieved';
		}
		return slaRecord.stage;
	},
	/**
	 * @description Updates every SLA for incident that is not paused
	 */
	__updateEverySLAEver: function() {
		this.run();
	},
	'type' : 'SLARunner'
};