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promise-pool-ext
Advanced tools
Queue promises into pool limiting concurrency
Install with npm:
$ npm install --save promise-pool-ext
import { Pool } from 'promise-pool-ext';
const pool = Pool({ concurrency: 10 });
// queue array of functions, returns Promise < array of function results >
pool([
() => new Promise((resolve) => { /* do async logic here */ }),
async () => { /* do async logic here */ }
]);
// queue function, returns Promise < function result >
pool(async () => { /* do async logic here */ });
See tests for more examples
import { PoolManager } from 'promise-pool-ext';
const manager = PoolManager({
check1: {
if: () => false, // when not true returned, promise is not resolved and undefined is returned
fn: () => { /* return async logic */ }
},
check2: {
requires: ['check1'],
fn: ({ check1 }) => {
if (check1) { /* return async logic */ }
}
},
data: {
requires: ['check1', 'check2'],
fn: ({ check1, check2 }) => {
if (check1 && check2) { /* return async logic */ }
}
}
}, { concurrency: 10 });
// returns Promise < data.fn result >
manager.get('data');
See tests for more examples
Allows sequential handling of async tasks that are enqueued.
Used to enqueue an (async) task. This task will be executed once all previous tasks have executed.
Can use flush to finish all pending tasks in order. The next task is only executed once the previous one has completed.
See tests for more examples.
How many promises can resolve in parallel.
Maximum amount of time in ms that a promise can take to resolve before a failure is returned.
If 0
or undefined
is passes, no timeout is enforced.
When a promise is rejected or an error is thrown, the returned promise is rejected once all promises in batch have completed execution.
As an example, when making a lot of external requests one can hit limits of the external API or the node runtime itself. This library makes it easy to limit the amount of parallel executions.
FAQs
Queue promises into pool limiting concurrency
The npm package promise-pool-ext receives a total of 591 weekly downloads. As such, promise-pool-ext popularity was classified as not popular.
We found that promise-pool-ext demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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