broadway

Lightweight application extensibility and composition with a twist of feature reflection.

Example

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");

plugins/helloworld.js

// `exports.attach` gets called by broadway on `app.use`
exports.attach = function (options) {

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

};

// `exports.init` gets called by broadway on `app.init`.
exports.init = function (done) {

  // This plugin doesn't require any initialization step.
  return done();

};

run it!

josh@onix:~/dev/broadway/examples$ node simple/app.js 
Hello world!
josh@onix:~/dev/broadway/examples$

Installation

Installing npm (node package manager)

  $ curl http://npmjs.org/install.sh | sh

Installing broadway

  $ [sudo] npm install broadway

API

App#init(callback)

Initialize application and it's plugins, callback will be called with null or initialization error as first argument.

App#use(plugin, options)

Attach plugin to application. plugin should conform to following interface:

var plugin = {
  "name": "example-plugin", // Plugin's name

  "attach": function attach(options) {
    // Called with plugin options once plugin attached to application
    // `this` - is a reference to application
  },

  "detach": function detach() {
    // Called when plugin detached from application
    // (Only if plugin with same name was attached)
    // `this` - is a reference to application
  },

  "init": function init(callback) {
    // Called on application initialization
    // App#init(callback) will be called once every plugin will call `callback`
    // `this` - is a reference to application
  }
};

App#on(event, callback) and App#emit(event, data)

App inherits from EventEmitter2, and many plugins build on this functionality.

Built-In Events:

error:init: Broadway emits this event when it throws an error while attempting to initialize.

Read the EventEmitter2 documentation for more information.

Tests

All tests are written with vows and should be run with npm:

  $ npm test

rektide / broadway