Question

我正在使用喉咙npm来限制并发性，我想知道如何测试它是否真的有效？就像我的代码运行良好，但我怎么能确定它实际上是限制？

这是我的代码：

const throat = require('throat');

readURLsfromFile().then( (urls) => {

    Promise.all(urls.map(
        throat(1, (url, i) => {
            main(urls[i], i, urls.length)
        }))
    );
})

编辑：我尝试过Tushar的想法，但我无法让它发挥作用。也许我没有正确使用喉咙？这是我正在尝试的代码：

const throat = require('throat')(1);
var request = require('request');
let counter = 0

throat(() => {
    counter++
    console.log(counter, 1)
    main(1).then( () => --counter)
})
throat(() => {
    counter++
    console.log(counter, 2)
    main(2).then( () => --counter)
})
throat(() => {
    counter++
    console.log(counter, 3)
    main(3).then( () => --counter)
})


function main(i) {
    return new Promise( (resolve,reject) => {
        request("http://google.com", (err, response, html) => { 
            resolve()
        })
    })
}

Answer 1

简单设置一个计数器

let counter = 0; // set the counter to zero
const throat = require('throat');

readURLsfromFile().then( (urls) => {

    Promise.all(urls.map(
        throat(1, (url, i) => {
            counter++;
            console.log(counter, i); // print counter value and i
            main(urls[i], i, urls.length);
        }))
    );
})

function main (..........) { ....... --counter;  } // decrement the counter value once task is completed

如果计数器始终打印1，即一次只运行一个进程。

如何测试我的并发限制是否在javascript中工作？

1 个答案: