aws-cdk
Version:
CDK Toolkit, the command line tool for CDK apps
45 lines • 4.29 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.parallelPromises = void 0;
/**
* Run a number of promise generators with max parallelism
*
* Order is not maintained between the input and output.
*/
async function parallelPromises(n, promises) {
const ret = new Array();
let count = 0;
let error;
const queue = [...promises];
return new Promise((ok, ko) => {
tick();
function tick() {
if (count === 0 && error) {
ko(error);
return;
}
if (count === 0 && queue.length === 0) {
ok(ret);
return;
}
while (count < n && queue.length > 0 && !error) {
const next = queue.shift();
if (next !== undefined) {
start(next);
}
}
}
function start(fn) {
count += 1;
fn()
.then((result) => { ret.push(result); })
.catch((e) => { error = e; })
.finally(() => {
count -= 1;
tick();
});
}
});
}
exports.parallelPromises = parallelPromises;
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