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rxjob.js
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rxjob.js
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const Rx = require('rxjs')
const RxOp = require('rxjs/operators')
const EventEmitter = require('events')
//import { v1 as uuidV1 } from 'uuid'
const { v1: uuidV1 } = require('uuid')
class RxEmitter extends EventEmitter {}
/**
* The Job class bases rxjs,
* todo add priority quene
* @param {callback function } error - the callback when the error of task executing
* @param {callback function } complete - the callback when the complete of party task executing
*
*/
/**
* The task struct,
* the task have 2 type, need to care status or no care
* if task need to wait a response from other, the status of task can be set ,
* if task don't care any response, you set NORESPONSE, after fn is called, the task is removding
* when status is set to DONE, the task is removing
struct {
status:JOBSTATUS.READY
fn: //callback
args: the argument of fn, a object
}
*/
const TASKSTATUS = {
READY: 1,
DOING: 2,
WAITING: 3,
DONE: 4,
NONSTATUS: 5
}
const JOBSTATUS = {
READY: 1,
PAUSE: 2,
STOPED: 3
}
class Job {
constructor(error, complete) {
this.taskList = Array()
this.status = JOBSTATUS.READY
this.emitter = new RxEmitter()
this.ecall = error
this.cplcall = complete
}
async idle() {
//console.log('start idle')
let firetrigger = new Promise((resolve) => {
this.emitter.on('kickoff', () => {
// console.log('kickoff event ')
resolve()
})
})
return firetrigger
}
async process() {
console.log('start task process')
while (this.status !== JOBSTATUS.STOPED) {
if (this.status == JOBSTATUS.READY) {
if (this.taskList.length === 0) {
await this.idle()
console.log('idle over from task....')
}
let taskRx = Rx.from(this.taskList)
let curTasks = taskRx.pipe(
RxOp.filter((item) => {
// console.log(item)
return item.status === TASKSTATUS.NONSTATUS || item.status === TASKSTATUS.READY
}),
RxOp.take(5)
)
let iswait = false
curTasks.pipe(RxOp.isEmpty()).subscribe((res) => {
if (res) {
// console.log("the curTasks is null")
iswait = true
}
})
if (iswait) {
// console.log("enter idle from rx ....")
await this.idle()
// console.log("idle over from rx ....")
}
curTasks.subscribe({
next: (item) => {
switch (item.status) {
case TASKSTATUS.NONSTATUS:
this.removeTask(item.taskId)
break
case TASKSTATUS.READY:
this.setTaskStatus(item.taskId, TASKSTATUS.DOING)
break
default:
this.removeTask(item.taskId)
break
}
item.task.fn(item.task.args)
},
error: (err) => {
console.log('Job executing is Error: ' + err)
if (this.errcalllback) {
errcalllback()
}
// this.status = JOBSTATUS.STOPED
},
complete: () => {
if (this.cplcall) {
this.cplcall()
}
// console.log('current tasks complete');
}
})
}
}
console.log('the Job process is ended')
}
addTask(task) {
let kickFlag = this.taskList.length ? false : true
let taskId = uuidV1()
this.taskList.push({ taskId, status: TASKSTATUS.NONSTATUS, task })
if (kickFlag) {
this.kickOff()
}
return taskId
}
setTaskStatus(taskId, status) {
const index = this.taskList.findIndex((it) => {
return it.taskId === taskId
})
if (index !== -1) {
this.taskList[index].status = status
}
}
removeTask(taskId) {
const index = this.taskList.findIndex((it) => {
return it.taskId === taskId
})
if (index !== -1) {
this.taskList.splice(index, 1)
}
}
kickOff() {
//console.log("send kickoff")
this.emitter.emit('kickoff')
}
stopJob() {
this.status = JOBSTATUS.STOPED
this.kickOff() //prevent from lock in idle
}
}
async function jobtest() {
const jobtest = new Job()
for (let i = 0; i < 10; i++) {
const task = {
fn: console.log,
args: i
}
let uuid = jobtest.addTask(task)
if (i % 2 === 0) {
jobtest.setTaskStatus(uuid, TASKSTATUS.WAITING)
}
}
jobtest.process()
for (let i = 0; i < 3; i++) {
const task = {
fn: console.log,
args: i + 10
}
jobtest.addTask(task)
}
console.log('wait 5 seconds kickoff')
setTimeout(() => {
//resolve()
jobtest.kickOff()
}, 5000)
waiting = new Promise((resolve) => {
console.log('input ctrl^c end')
setTimeout(() => {
//resolve()
console.log('game over')
}, 100000)
})
//jobtest.stopJob()
console.log('wait 3 seconds kickoff')
setTimeout(() => {
//resolve()
jobtest.kickOff()
}, 3000)
setTimeout(() => {
for (let i = 0; i < 3; i++) {
const task = {
fn: console.log,
args: i + 100
}
jobtest.addTask(task)
}
}, 3000)
Promise.all([waiting])
}
//jobtest()
module.exports = {
Job,
JOBSTATUS,
TASKSTATUS
}