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asyncPool.js
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77 lines (72 loc) · 1.27 KB
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function asyncPool(max = 6) {
let count = 0;
let queue = [];
return async function (fn) {
const handle = function (fn) {
count++;
fn().finally(() => {
count--;
if (queue.length) {
let job = queue.shift();
job();
}
});
};
if (count < max) {
count++;
fn().finally(() => {
count--;
if (queue.length) {
let job = queue.shift();
job();
}
});
} else {
queue.push(() => handle(fn));
}
};
}
const pool = asyncPool(2);
debugger;
pool(() => {
return new Promise((resolve, reject) => {
console.log(1);
resolve(1);
});
});
pool(() => {
return new Promise((resolve, reject) => {
console.log(2);
reject(2);
});
});
pool(() => {
return new Promise((resolve, reject) => {
console.log(3);
resolve(3);
});
});
pool(() => {
return new Promise((resolve, reject) => {
console.log(4);
resolve(4);
});
});
pool(() => {
return new Promise((resolve, reject) => {
console.log(5);
resolve(5);
});
});
pool(() => {
return new Promise((resolve, reject) => {
console.log(6);
resolve(6);
});
});
pool(() => {
return new Promise((resolve, reject) => {
console.log(7);
resolve(7);
});
});