app.js

// app.js is the main entry point into your application, this in turn creates the
// http server. You can create more entry points for tools and tests as long as
// you add the same global services to the serviceLocator.

var cluster = require('cluster')
  , cpus = require('os').cpus()
  , serviceLocator = require('service-locator').createServiceLocator()
  , properties = require('./properties')()
  , nodemailer = require('nodemailer')

function log() {
  var output = Array.prototype.slice.apply(arguments)
  output.unshift((new Date()).toISOString())
  console.log.apply(null, output)
}

// All application need: properties, logger and most likely a mailer for sending
// emails. saveFactory is also created here for defining data storage. The default
// bundles need all of these.
serviceLocator
  .register('properties', properties)
  .register('logger', { info: log, debug: log, warn: log, error: log })
  .register('mailer', nodemailer.createTransport('sendmail'))
  .register('saveFactory', {})

// Cluster is used in all but the development environment
if ((properties.env !== 'development') && (cluster.isMaster)) {

  serviceLocator.logger.info('Forking ' + cpus.length +
    ' cluster process, one per CPU')

  // Create one instance of the app (i.e. one process) per CPU
  cpus.map(function () {
    cluster.fork()
  })

  // Report child process death
  cluster.on('death', function (worker) {

    serviceLocator.logger.error('Worker ' + worker.pid + ' died', worker)

    if (worker.signalCode === null) {
      cluster.fork()
    } else {
      serviceLocator.logger.error('Not forking new process because ' +
        worker.signalCode + ' was given')
    }

  })

} else {
  // Now we create the web server
  require('./server')(serviceLocator)
}