parallel-write-stream

parallel-write-stream

Parallel Write Stream is an abstract class which helps create kind of passthrough stream. Your have to implement _save method and operate with the object streams only.

Regardless of how data will flow into your writable stream, the batch of tasks will be processed in parallel.

Install

$ npm install --save parallel-write-stream

Usage

To implement parallel write stream, follow the pattern:

var util = require('util');
var ParallelWriteStream = require('parallel-write-stream');

var Updater = function () {
  ParallelWriteStream.call(this);
};
util.inherits(Updater, ParallelWriteStream);

Updater.prototype._save = function (doc, callback) {
  // implement procedure to save doc here
  // invoke callback then save will be done
  callback();
};

The size of the batch is specified in the options passed to constructor.

var update = new Updater({
  concurrency: 5
});

API

_save(doc, callback)

doc

The document you want to store, update or process in other way.

callback(err)

A function which is called when the processing is finished. First argument is the error.

License

MIT © 2015 Vladimir Kuznetsov