最近 node.js 來勢洶洶, 怎麼辦? 別怕, 我們也有秘密武器 ringojs!

頑皮工坊 Sleepnova Inc. 創

辦人暨執行長周立瑋

自我介紹

頑皮工坊 Sleepnova Inc. 創辦人暨執行長，KKBOX Android

技術顧問。

（Android 與雲端技術顧問公司）

感興趣的領域:- 敏捷開發，尋找更符合人性的程式設計典範。

- 可應付高承載的延展性架構。

- 思考資訊人為社會做點什麼?

過去經歷

Talks:● Javascript take-off to the clouds - Server-side Javascript

@ COSCUP 2009● The NoSQL movement: CouchDB as an example @

COSCUP 2010Projects:

● 東森大選即時開票系統，締造兩千兩百萬 req / 4 hr 記錄

最近 node.js 來勢洶洶, 怎麼辦? 別怕, 我們也有秘密武器 RingoJS!

簡介

簡介 RingoJS 的特色，如何使用 RingoJS 在 JVM 上面快速開發，以及如何在專案中同時保有 scripting 的靈活度以及使用既有的 Java Library。

Why JavaScript

The native language of the web

JavaScript 到底是不是個語言?

About JavaScript

● Javascript vs. Java <恩怨情仇>

● JavaScript 不能拿來寫大系統?

● CommonJS module system

RingoJS overview

● Developed by Hannes Wallnöfer (hns.github.com)● Based on Mozilla Rhino● Runs on JVM● Orignal named HelmaNG● Follow CommonJS

Node.js vs RingoJS

1. VM maturaty2. Community size3. Library base4. Java interopability5. Single-thread vs. Multi-thread

Node.js vs RingoJS

● VM optimize for browser● Young community● Not much library but will grow● No Java interoperability● Single thread

● Quite mature enterprise grade VM● Big community● Lots of Java library● Very good Java interoperability● Multi-thread

Rhino JavaScript Engine

● JavaScript <-> Java inter-operation○ Access Java packages and classes○ Working with Java objects○ Inherit class/interface

● E4X

Accessing Java packages and classesjs> Packages.java[JavaPackage java]

js> java[JavaPackage java]

js> java.io.File[JavaClass java.io.File]

js> importPackage(java.io)js> File[JavaClass java.io.File]

Working with Java objects

js> new java.util.Date()Thu Jan 24 16:18:17 EST 2002

var File = java.io.File;var myfile = new File("sample.txt");

Working with Java objects

js> f = new java.io.File("test.txt")test.txtjs> f.exists()truejs> f.getName()test.txt

Implementing Java Interfaces

js> obj = { run: function () { print("\nrunning"); } }[object Object]js> obj.run()

running

js> r = new java.lang.Runnable(obj);[object JavaObject]

Implementing Java Interfaces

js> r = new java.lang.Runnable({run: function () { print("\nrunning"); }});

[object JavaObject]

Working with Java objects

js> for (i in f) { print(i) }existsparentFilemkdirtoStringwait

特異功能 E4X

var sales = <sales vendor="John"> <item type="peas" price="4" quantity="6"/> <item type="carrot" price="3" quantity="10"/> <item type="chips" price="5" quantity="3"/> </sales>; alert( sales.item.(@type == "carrot").@quantity );alert( sales.@vendor );for each( var price in sales..@price ) { alert( price );}delete sales.item[0];sales.item += <item type="oranges" price="4"/>;sales.item.(@type == "oranges").@quantity = 4;

RingoJS

● Minimal web app● Packages● Storage● AppEngine

Hello World!

exports.app = function(req) { return { status: 200, headers: {"Content-Type": "text/plain"}, body: ["Hello World!"] };};

if (require.main == module) require("ringo/httpserver").main(module.id);

Ringo Shell

>> var fs = require('fs');>> var file = fs.open('README.md');>> var lines = [line for (line in file)];

Handle HTTP Request// actions.jsvar Response = require('ringo/webapp/response');var model = require('./model');

exports.index = function(req) { var posts = model.Post.query().select().slice(0,10); return Response.skin('skins/index.html', { posts: posts, });};

Skins

// in a skin<% for post in <% posts %> render 'postOverview' %>

<% subskin 'postOverview' %> <h2><% post.title %></h2>

URL mapping

// config.jsexports.urls = [ ['/', './actions'],];

Database

● ringo-sqlstore● berkeleystore● cassandrastore● mongodbstore● redis-ringojs-client● Google App Engine Datastore API

Mongodbstore

Initializing the store:include('ringo/storage/mongodbstore');store = new Store('server', 27017, 'dbName');

Creating a new Storable class:Book = store.defineEntity('book');

Creating and saving a new Storable instance:var b = new Book({title: "DBs for dummies"});b.save();

MongodbstoreRetrieving all objects from a db:var books = Book.all();

Retrieving an object by id:var book = Book.get(id);

Deleting an object from the db:book.remove();

Running a query on the database:Book.query().equals('prop', value).select();

Berkeleystore

Initializing the store:include('ringo/storage/berkeleystore');store = new Store(dbpath);

Creating a new Storable class:Book = store.defineEntity('book');

Creating and saving a new Storable instance:var b = new Book({title: "DBs for dummies"});b.save();

天下沒有白痴的午餐

天下沒有白吃的午餐

Performance characteristic

● Translation to JVM bytecode● JVM is not a perfect dynamic language VM

yet!

Performance characteristic

$ node v8bench.js19 Aug 16:13:33 - Score (version 5): 4090

$ java -Xmx265m -jar js.jar run.jsScore (version 5): 120

[larger is better]

~1/34

Node.js vs RingoJS GC Benchmark

http://hns.github.com/2010/09/29/benchmark2.html

Future of JavaScript Engine

JavaScript engine● Nashorn, dyn.js● InvokeDynamic

JavaScript territory

● Titanium● CouchDB● Unity● node.js + webkit● RingoJS + SWT● ES operating system● Ubuntu Desktop

Stay Hungry, Stay Foolish!