Google 2010 開發者聚會 筆記(devfest)

今年參加 Google 的 開發者聚會(#devfest), 把筆記先簡單整理出來, 做個紀錄.

• 議程、簡報 可見: Sessions - devfestapac

Google #devfest 筆記

開場

• 在網路開發軟體
• 不注意device, 注意的是服務，都在瀏覽器上
• Netbook: Chrome os
• Mobile: Android
• Browser: Chrome
• Chrome web store
• Taiwan 可以上載 android software
• 付費android software
• GAE 5m pv/month free

Introduction to android & key froyo features - Fred

• 圖表搜尋: Android dashboard
• Referral tracking
• C2dm can send 1mb
• Layout 不要用 pixels , 要用 dip, dip=虛擬的pixel單位
• android intro
• chrome2phone apps
• C2DM - Send Message
• HTTP POST https://android.apis.google.com/c2dm/send/
• registration_id
• collapse_key
• clientLogin Auth token
• data.1, data.2, ...

HTML5 in Chrome - Arne Roomann-Kurrik

• 簡報: http://kurrik-slides.appspot.com/html5-techtalk/
  • Where have we been?
  • 1990 First web page
  • 1994 HTML2
  • 1995 JavaScript
  • 1996 CSS1
  • 1997 HTML4
  • 1998 CSS2
  • 1999 XMLHTTP - MS
  • 2002 XmlHttpRequest
  • 2005 AJAX
  • 2009 HTML5
• Draw in canvas
  • Canvas 3D(WebGL)
  • Inline SVG
• Multimedia
  • Audio
  • Video
• Data
  • Storing Data on the Client
  • Other Storage Options
• Working Hard with Worker Threads
  • main.js:
    var worker = new Worker('extra_work.js');
    worker.onmessage = function (event) { alert(event.data); };
  • extra_work.js:
    postMessage(some_data);
  • WebSockets: http://bit.ly/websocket-raytrace
• Deep Integrations - Interacting with the client Operating System
  • Dragging & Dropping
  • www.chromabrush.com
  • chrome brush
• Look Who's Calling - Notifications
• Device Orientation - 超酷, 可以讀取裝置的水平位置
• CSS3
  • New Style Options
  • Transforms & Transitions: -webkit-transform
  • Animations
  • Beautiful Fonts with @font-face
  • Flexible Box Model: Css supports 100% height and vertical centering!
• More HTML5 Goodies to Consider
  • Application Cache - offline experience
  • Geolocation - tag location information for darwings or users
• Resources
  • http://html5rocks.com
  • http://twitter.com/ChromiumDev
  • http://github.com/kurrik/html-samples
  • http://goo.gl/WQOV

The New Social Web: It's about Open Standards - Timothy Jordan

• twitter: @timothyjordan
• Open Standards
• Google Buzz
• oAuth
• ATOM
• http://code.google.com/p/pubsubhubbub - The Source pushes the comment to all subscripbers.
• salmon-protocol.org
• activitystrea.ms

Google App Engine Selected Design Patterns - Ping Yen #devfest

• 簡報: http://goto.ext.google.com/sykdj
• Scalability means flexibility
  • 30秒會自動把那 process 砍掉.
• DataStore - Reading / writing data
• Data layout in DataStore - queries, keys, indexes do make sense.
  • Characteristics of Big Table
    • com.cnn.tech
    • com.cnn.www
    • com.cnn.www/a
• Entity table and kind index
  • Entity Table: Key, Serialized entity
    • Key: "Class+id, ex: Message/2487", Serialized entity: "se(Message 1)
    • Key: "Class+id, ex: Message/3941", Serialized entity: "se(Message 2)
    • Key: "Class+id, ex: User/20", Serialized entity: "se(User 1)
    • Key: "Class+id, ex: User/937", Serialized entity: "se(User 2)
• Kind Index Table: Kind, Key
  • Kind: Message, Key: Message/2487
  • Kind: Message, Key: Message/3941
  • Kind: User, Key: User/xxx ...
• Single property index
  • SELECT * FROM Message WHERE sender = "alba" AND receiver = "dev"
  • 建立 Index, GAE 會分析程式, 自動去建立所需要得 Index. (建立 sender, receiver 得 Index)
  • DataStore query = BigTable scan
• Pattern: Relational entity - Don't deserialize entities if you don't have to.
  • Parent 得關係來解決 600萬筆得 List (撈出 key, 然後在 db.get(key))
• Task Queues: Getting work done in the background.
• Pattern: Do it later - so you can get back to your user sooner.
  • update statistics - 數數字在裡面是很難的, 這個很昂貴.
  • 在 update data 就把該加得加好, 不用當場算. (Materialized View)
  • Queue Mediator runs and runs - 把工作平行化得方式(Materialized View)
    • 做1, 把2,3,4送出去, 做完1前, 可能 2,3,4 都做完了. (ex: 寄 Email)
    • 加入
      Task: task = Task(url="/send_a_mail", params ...)
      task.add("mail_queue")
    • Idempotent: Request 有可能會沒被做到, 所以 Task 要保正式 idempotent(多做無妨)
    • 因為可能會重複做, Task 要注意是要多做一次也沒關係得 task.
• Pattern: Continuation Tasks: 化整為零
• Too many tasks, not enough time!
• Time limit: 每個 request 30秒.
• Divide tasks, 幫 task 紀錄, 先把工作切一切, 先作30秒, 然後下一個 Task 在繼續接著做30秒. ... 等等.
• Failures happen: 可能會 retried.
• 送 Task 得時候, 幫 Task 取個名字, 當這個名字在 7 天內, 不能出第二次, 就不會遇到一直重複 retry 爆炸得問題.
• Fork-Join
• App Engine for Business
  • SSL and SQL: 支援 https 和 SQL (Scalable 沒那麼大, 所以可以用 SQL)
  • Technical support
  • Formal SLA: 99.9%
  • Centralized admin console
  • Enterprise pricing
• Resources
  • http://code.google.com/appengine
  • [email protected]
  • Taipei GTUG

運用 Google Apps Marketplace 整合您得應用服務 - Kevin Huang

•  設定
  1. 設定 Google App 可以透過 Google 允許 SSO
  2. 更多 -> 尋找更多.
• Developer
  1. 建立 Web 應用程式
     • 任何您想要得開發工具及佈署環境
  2. 整合您得應用程式
     1. OpenID 單一遷入身份認證 (必要)
        • http://mazinger-z.appspot.com/openid?domain=abc.com.tw
        • PHP OpenID library: php-openid, php-openid-apps-discovery
     2. OAuth 授權存取 Docs, Calendar 等資料 (選擇)
  3. 產品上架
  • 步驟 
    • 成為廠商
    • 建立 Manifest.xml
    • 登錄
    • 測試
    • 送審
  • Buzz-bingo Google code
  • OACurl Cookbook - http://code.google.com/intl/zh-TW/apis/buzz/v1/oacurl.html

作者: Tsung

對新奇的事物都很有興趣, 喜歡簡單的東西, 過簡單的生活. 檢視「Tsung」的全部文章