node-pop

node-pop

node-pop is a Node.js worker that parallelizes processing a function that is io bound.

An example node-pop worker.

mkdir worker
cd worker
touch package.json
touch worker.js
touch config.js
touch job.js
touch log.js

Package

Edit your package.json file like this:

{
  "name": "worker",
  "version": "1.0.0",
  "private": false,
  "engines": {
     "node": "*",
     "npm":  "*"
  },
  "dependencies": {
    "node-pop" : "1.2.0"
  }
}

Then install node-pop.

$ npm install -d

Worker

Edit worker.js to someting like this:

var nodePop = require('node-pop');
var config = require('./config.js');
var job = require('./job.js');
var log = require('./log.js');

job.init({
  nodePop: nodePop
});

nodePop.init({

  config: config,
  job: job,
  log: log

}, function (err) {

  if (err) {
    log(err);
  } else {
    nodePop.wake();  
  }

});

Config

Edit config.js to someting like this:

module.exports = {
  redis: {
    client: false,
    spop: 'my-node-pop-set',
    host: '127.0.0.1',
    port: '6379',
    pass: 'password',
    db: 1
  },
  moderate: {
    interval: 1000,
    limit: 100,
    ttl: (1000 * 30)
  }
};

Job

Edit job.js to someting like this:

module.exports = {
  init: function (params) {
    var that = this;
    var nodePop = that.nodePop;
  },
  process: function (mem) {
    var that = this;
    var nodePop = that.nodePop;
  }
};

Log

Edit log.js to someting like this:

module.exports = function (mes) {
  console.log(mes);
};

Try it out.

Now that everything is in place you can start your worker.

$ node worker.js

Flusing out your job.

Now that you have a node-pop worker setup you will want to actually have some custom logic. In the example below the job will take the member, wait 2 seconds, queue the next job, and then inform node-pop that it is one so node-pop can move onto the next member. Obviously this is a contrived example.

module.exports = {

  init: function (params) {
    var that = this;
    var nodePop = params.nodePop;
    that.nodePop = nodePop
  },
  
  process: function (mem) {
  
    var that = this;
    var nodePop = that.nodePop;
  
    setTimeout(function () {
    
      console.log('PROCESSED * mem -> ' + mem);
      
      nodePop.queue({
        set: 'next-node-pop-set',
        mem: mem
      }, function (err) {
        if (err) { console.log(err); }
        nodePop.done(mem);
      });
      
    }, (1000 * 2))
    
  }
};