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pors

v0.1.1

Published

Flow control system

Downloads

15

Readme

pors 是一個簡單的批次執行排程系統,能夠批量處理函式,這模式有很多人做過了,但都不能夠同時兼任棋子和塞子的角色,所以又花了一點時間做了這個。


棋子 - pawn

pawn 是一個常駐物件,你可以不斷推送執行續給 pawn,它會直接執行,若超過同步執行量則會限制同步運行的數量。

Example

import { pawn } from 'pors'

let count = 0
pawn(2) // 一次允許的執行量,無填入則不會限制
    .add(done => {
        setTimeout(() => {
            count += 1
            done()
        }, 1000)
    })
    .add(done => {
        setTimeout(() => {
            count += 1
            done()
        }, 1000)
    })
    .add(done => {
        setTimeout(() => {
            count += 1
            done()
        }, 1000)
    })
setTimeout(() => {
    console.log(count) // 2
}, 1100)

優先執行

可以透過 addFirst 將該排程插入貯列的最優先:

import { pawn } from 'pors'

let array = [] as number[]
pawn(1)
    .add((done) => {
        setTimeout(() => {
            array.push(1)
            done()
        }, 25)
    })
    .add((done) => {
        setTimeout(() => {
            array.push(2)
            done()
        }, 25)
    })
    .addFirst((done) => {
        setTimeout(() => {
            array.push(3)
            done()
        }, 25)
    })
setTimeout(() => {
    console.log(array.join()) // 1,3,2
}, 100)

透過 Async Function

可以透過 addAsync 省略 doneerrorcallback

import { pawn } from 'pors'

let array = [] as number[]
pawn(1).addAsync(async() => {
    array.push(1)
})

成員

size

let pawn = pawn(2).add(done => {
    setTimeout(() => {
        count += 1
        done()
    }, 1000)
})
console.log(pawn.size) // 1

事件

empty

當系統執行完佇列後觸發

系統監聽一樣可以監聽到該事件。

let pawn = pawn()
pawn.on('empty', () => {
    console.log('done')
})
建議使用onEmpty

on 不同的地方在於 onEmpty 宣告的當下若已經沒有執行續,會觸發一次 callback

let pawn = pawn()
pawn.onEmpty(() => {
    console.log('done')
})

Event

import { pawn } from 'pors'

let pw = pawn()
pw.on('done', (event) => {
    console.log(event)
    /*
        {
            "name": "Pawn",
            "type": "done",
            "context": {
                "id": "f73ac396-7202-461e-8eb2-e16ef273cf27",
                "thread": [Function]
            },
            "listener": {
                "id": "442a65ce-1972-4ebf-853b-4188dce42c14",
                "off": [Function]
            }
        }
    */
})
pw.add(done => done())

取消監聽

event 事件呼叫後會回傳一個 listener 物件,藉由宣告 off 取消監聽:

let listener = pawn().on('done', (event) => {})
listener.off()

藉由 off 與id接口取消 event

let pw = pawn()
let listener = pw.on('done', (event) => {})
pw.off('done', listener.id)

系統事件

所有的事件都會觸發系統層監聽的事件:

import { on } from 'pors'

on('done', () => {
    console.log('123')
})

pawn().add(done => done())

通用事件

不論棋子還是塞子都有以下三種事件

run

每個執行續執行前會觸發該事件。

done

每個執行續執行前完整結束後會觸發該事件。

error

每個執行續執行錯誤會觸發該事件。

pawn().add((done, error) => {
    error() // 由此觸發
})

批量處裡

each 可以一次迭代一個陣列:

pawn().each([1,2,3,4], (value, index, done, error) => {
    // do something...
})

也可以直接填入數字:

pawn().each(5, (value, index, done, error) => {
    console.log(value === index) // true
    // do something...
})

清空排程

clear 可以清空所有正在等待執行的排程:

pawn().add(d => d()).clear()

塞子 - stopper

塞子是預先加入執行續,最後再宣告執行:

Example

import { stopper } from 'pors'

let count = 0
stopper(2) // 一次允許的執行量,無填入則不會限制
    .add(done => {
        count += 1
        done()
    })
    .add(done => {
        count += 1
        done()
    })
    .start(() => {
        console.log(count) // 2
    })

錯誤處理

塞子在宣告 error 後會直接中斷所有程序,並將 result 傳入 callback

import { stopper } from 'pors'

let count = 0
stopper(2) // 一次允許的執行量,無填入則不會限制
    .add((done, error) => {
        error('123')
    })
    .start((error) => {
        console.log(error) // '123'
    })

透過 Async Function

可以透過 addAsync 省略 done、error 等 callback:

import { stopper } from 'pors'

let array = [] as number[]
stopper(1).addAsync(async() => {
    array.push(1)
})

塞子事件

Process

系統監聽一樣可以監聽到該事件。

let step = stopper()
step.on('process', ({ loaded, totalThread }) => {
    console.log(`${loaded}/${totalThread}`)
})

關閉程序

執行 start 後會得到一個 process 物件,宣告 close 可以中斷執行續:

import { stopper } from 'pors'

let count = 0
stopper(2)
    .add((done, error) => {
        error('123')
    })
    .start((error) => {
        console.log(error)
    })
    .close()

幫浦 - pump

一個累積計數等待回呼的工具:

import pors from 'pors'
let pump = pors.pump(() => console.log('OuO'))
pump.add(2)
pump.press()
pump.press() // 'OuO'