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GitHub - almost/through2-concurrent: Simple Node.JS stream (streams2) Transform that runs the transform functions concurrently (with a set max concurrency)
Simple Node.JS stream (streams2) Transform that runs the transform functions concurrently (with a set max concurrency) - almost/through2-concurrent
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GitHub - almost/through2-concurrent: Simple Node.JS stream (streams2) Transform that runs the transform functions concurrently (with a set max concurrency)

GitHub - almost/through2-concurrent: Simple Node.JS stream (streams2) Transform that runs the transform functions concurrently (with a set max concurrency)

through2-concurrent

NPM

A simple way to create a Node.JS Transform stream which processes in parallel. You can limit the concurrency (default is 16) and order is not preserved (so chunks/objects can end up in a different order to the order they started in if the transform functions take different amounts of time).

Built using through2 and has the same API with the addition of a maxConcurrency option.

Non-objectMode streams are supported for completeness but I'm not sure they'd be useful for anything.

Written by Thomas Parslow (almostobsolete.net and tomparslow.co.uk) as part of Active Inbox (activeinboxhq.com).

Build Status

Install

npm install --save through2-concurrent

Examples

Process lines from a CSV in parallel. The order the results end up in the all variable is not deterministic.

var through2Concurrent = require('through2-concurrent');

var all = [];

fs.createReadStream('data.csv')
  .pipe(csv2())
  .pipe(through2Concurrent.obj(
    {maxConcurrency: 10},
    function (chunk, enc, callback) {
      var self = this;
      someThingAsync(chunk, function (newChunk) {
        self.push(newChunk);
        callback();
      });
  }))
  .on('data', function (data) {
    all.push(data)
  })
  .on('end', function () {
    doSomethingSpecial(all)
  })

Contributing

Fixed or improved stuff? Great! Send me a pull request through GitHub or get in touch on Twitter @almostobsolete or email at [email protected]

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