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broadway.js (module)

var App = function () {
  // Constructor
  this.on('app::*') {
    this.plugins.forEach(function (e) {
      if (e[eventname]) {
        e[eventname]();
      }
      // We can have all types here, (Ex: async callback, sync callback, data passing)
    }
  }
}

App.prototype.use = function (plugin, options) {
  this.plugins.push(plugin);
}

App.prototype.init = function () {
  this.emit('app::init');
}

app.js

var broadway = require("broadway");

var app = new broadway.App();

// Passes the second argument to `helloworld.attach`.
app.use(require("./plugins/helloworld"), { "delimiter": "!" } );

app.init(function (err) {
  if (err) {
    console.log(err);
  }
});

app.hello("world");

app.emit('app::name');

app.hello("world");

plugins/helloworld.js

exports.init = function () {
  this.hello = function (world) {
    console.log("Hello "+ options.name || world + options.delimiter || ".");
  }
}

exports.name = function () {
  options.name = 'pavan'
}

Output

$ node app.js
Hello world!
Hello pavan!

Usage in flatiron

var path = require('path');
var broadway = require("broadway");

var app = new broadway.App();

fs.readdir(__dirname + '/node_modules/flatiron-*', function (err, files) {
  files.forEach(function (e) {
    app.use(require(e));
  });
});

Now the flatiron components such as director, union, resourceful uses app.emit to call events on which the plugins run things