nyx_schedule/lib/Job.js

nyx任务调度

/* global process */
/** @package
    job.js
    21/04/2015 NF   Removed database code. ie. From Job.remove()
  Last change: NF 21/04/2015 1:20:47 PM
*/

var humanInterval = require('human-interval'),
    CronTime = require('cron').CronTime,
    date = require('date.js'),
    moment = require('moment-timezone');
var Promise = require("bluebird");

module.exports = Job;

function Job(schedule , attrs) {
    this.scheduler = schedule;
    this.attrs = attrs;
};


Job.prototype.toJSON = function () { // create a persistable Mongo object -RR
    var self = this,
        attrs = self.attrs || {};

    var result = {};
    for (var prop in attrs) {
        if (attrs.hasOwnProperty(prop)) {
            result[prop] = attrs[prop];
        }
    }
    var dates = ['lastRunAt', 'lastFinishedAt', 'nextRunAt', 'failedAt', 'lockedAt'];
    dates.forEach(function (d) {
        if (result[d]) {
            result[d] = new Date(result[d]);
        }
    });
    return result;
};

/**
 * 计算job的下次执行时间
 */
Job.prototype.computeNextRunAt = function () {

    var start = this.attrs.start; //任务开始时间
    var end = this.attrs.end;     //任务结束时间
    var interval = this.attrs.interval; //任务间隔
    //var timezone = this.attrs.repeatTimezone; //时区
    if(!this.attrs.nextRunAt){
        this.attrs.nextRunAt = date(interval+" second from" , start);
    }else if(end && this.attrs.nextRunAt > end){
        this.disable();
    }else{
        this.attrs.nextRunAt = date(interval+" second from now");
    }
    
};

Job.prototype.disable = function () {
    this.attrs.disabled = 0;
    return this;
};

Job.prototype.enable = function () {
    this.attrs.disabled = 1;
    return this;
};

/**
 * 修改下次执行时间
 */
Job.prototype.schedule = function (time) {
    this._scheduled = true;
    this.attrs.nextRunAt = (time instanceof Date) ? time : date(time);
    return this;
};

/**
 * 设置优先级
 */
Job.prototype.priority = function (priority) {
    this.attrs.priority = priority;
    return this;
};

Job.prototype.fail = function (reason) {
    if (reason instanceof Error) {
        reason = reason.message;
    }
    this.attrs.failReason = reason;
    this.attrs.failCount = (this.attrs.failCount || 0) + 1;
    this.attrs.failedAt = new Date();
    return this;
};

/**
 * 运行job
 * @param cb 执行完毕后的回调函数
 */
Job.prototype.run = function (cb) {
    var self = this,
        scheduler = self.scheduler;

    var setImmediate = setImmediate || process.nextTick;
    setImmediate(function () {
        self.attrs.lastRunAt = new Date();
        scheduler.execJob(self).then(function(){
            self.computeNextRunAt();
            self.attrs.lastFinishedAt = new Date();
            self.attrs.lockedAt = null;
            self.save().finally(function(){
                cb(null , self);
            })
        }).catch(function(err){
            self.computeNextRunAt();
            self.attrs.lastFinishedAt = new Date();
            self.attrs.lockedAt = null;
            self.fail(err);
            self.save().finally(function(){
                cb(err , self);
            })
        })
    });
};

/**
 * 判断job是否在运行中
 */
Job.prototype.isRunning = function () {
    if (!this.attrs.lastRunAt) return false;
    if (!this.attrs.lastFinishedAt) return true;
    if (this.attrs.lockedAt && this.attrs.lastRunAt.getTime() > this.attrs.lastFinishedAt.getTime()) {
        return true;
    }
    return false;
};

/**
 * 保存job入库
 */
Job.prototype.save = function () {
    return this.scheduler.saveJob(this);
};



Job.prototype.touch = function (cb) {
    this.attrs.lockedAt = new Date();
    this.save(cb);
};