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throat
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Throttle the parallelism of an asynchronous, promise returning, function / functions. This has special utility when you set the concurrency to 1
. That way you get a mutually exclusive lock.
Professionally supported throat is now available
npm install throat
This returns a function that acts a bit like a lock (exactly as a lock if concurrency is 1).
Example, only 2 of the following functions will execute at any one time:
const throat = require('throat')(2);
const resA = throat(async () => {
/* async stuff... */
});
const resB = throat(async () => {
/* async stuff... */
});
const resC = throat(async () => {
/* async stuff... */
});
const resD = throat(async () => {
/* async stuff... */
});
const resE = throat(async () => {
/* async stuff... */
});
This returns a function that is an exact copy of worker
except that it will only execute up to concurrency
times in parallel before further requests are queued:
const throat = require('throat');
const input = ['fileA.txt', 'fileB.txt', 'fileC.txt', 'fileD.txt'];
const data = Promise.all(
input.map(throat(2, (fileName) => readFile(fileName)))
);
Only 2 files will be read at a time, sometimes limiting parallelism in this way can improve scalability.
To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.
MIT
FAQs
Throttle the parallelism of an asynchronous (promise returning) function / functions
The npm package throat receives a total of 11,560,201 weekly downloads. As such, throat popularity was classified as popular.
We found that throat demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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