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The 'batch' npm package is a utility that allows for batch processing of jobs, where jobs can be executed in parallel or serially. It is useful for managing and controlling the execution of multiple tasks at once, with features such as concurrency control, error handling, and event listening.
Batch Processing
This code sample demonstrates how to create a batch of jobs with a concurrency of 2, meaning two jobs will be processed at a time. It also shows how to listen for progress events and handle the completion of all jobs.
const Batch = require('batch');
const batch = new Batch();
batch.concurrency(2);
batch.push(function(done) {
setTimeout(function() {
console.log('Job 1 done');
done();
}, 1000);
});
batch.push(function(done) {
setTimeout(function() {
console.log('Job 2 done');
done();
}, 500);
});
batch.on('progress', function(e) {
console.log(e.percent + '% complete');
});
batch.end(function(err, results) {
console.log('All jobs completed');
});
Error Handling
This code sample demonstrates how to handle errors within a batch. If any job calls the 'done' callback with an error, the 'end' event will receive this error, allowing for centralized error handling.
const Batch = require('batch');
const batch = new Batch();
batch.push(function(done) {
// Simulate an error
done(new Error('Something went wrong'));
});
batch.end(function(err, results) {
if (err) {
console.error('Error encountered:', err.message);
}
console.log('Results:', results);
});
The 'async' package provides a collection of powerful functions for working with asynchronous JavaScript. It offers similar batch processing capabilities with functions like 'parallel', 'series', and 'queue'. Compared to 'batch', 'async' offers a broader set of features for controlling the flow of asynchronous operations.
The 'p-map' package is a promise-based map function that supports concurrency control, similar to the concurrency feature in 'batch'. It is designed to run multiple promise-returning & async functions with limited concurrency. 'p-map' is more modern with its promise-based interface compared to 'batch's callback-style.
The 'bluebird' package is a fully-featured promise library with utilities that can be used for concurrency control, similar to 'batch'. It includes methods like 'map', 'each', and 'mapSeries' that can be used for batch processing. 'bluebird' is more comprehensive in terms of promise-related features and optimizations.
Simple async batch with concurrency control and progress reporting.
$ npm install batch
var Batch = require('batch')
, batch = new Batch;
batch.concurrency(4);
ids.forEach(function(id){
batch.push(function(done){
User.get(id, done);
});
});
batch.on('progress', function(e){
});
batch.end(function(err, users){
});
Contain the "job" index, response value, duration information, and completion data.
{ index: 1,
value: 'bar',
pending: 2,
total: 3,
complete: 2,
percent: 66,
start: Thu Oct 04 2012 12:25:53 GMT-0700 (PDT),
end: Thu Oct 04 2012 12:25:53 GMT-0700 (PDT),
duration: 0 }
FAQs
Simple async batch with concurrency control and progress reporting.
We found that batch 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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