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 2010
Projects:
● 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。

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 maturaty
2. Community size
3. Library base
4. Java interopability
5. Single-thread vs. Multi-thread

Node.js vs RingoJS

● VM optimize for browser ● Quite mature enterprise grade VM
● Young community ● Big community
● Not much library but will grow ● Lots of Java library
● No Java interoperability ● Very good Java interoperability
● Single thread ● 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
classes
js> 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");


js> f = new java.io.File("test.txt")
test.txt
js> f.exists()
true
js> 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]


js> for (i in f) { print(i) }
exists
parentFile
mkdir
toString
wait

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.js
var 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.js
exports.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();

Mongodbstore
Retrieving 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();

Performance characteristic

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

Performance characteristic

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

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

[larger is better]

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

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

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