GWT + Gears : The browser is the platform
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Transcript of GWT + Gears : The browser is the platform
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Before starting, some questions
• Who knows javascript ?
• Who is a javascript expert ?
• Who knows java ?
2 Google Confidential
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Content
• Ajax : the good, the bad and the coward
• Demonstrations
• GWT for Chief (whatyouwant) Officer
• GWT for developers
• Gears for early adopters
3 Google Confidential
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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Ajax : Asynchronous updates
• Fresh data without reload
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Ajax : Rich Widgets
• Widgets : One more beautiful than the other
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Ajax : Partial update of the screen
• No more « Blank page » effect
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Single Page Interface : Better scalability
• Stateless Server
• Stateful client
ApplicationApplication
GUI+BusinessGUI+Business
+ Session+ Session
Data BaseData BaseDataData
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At first, Ajax is really cool
• So wonderful, incredible, marvellous
• So efficient
• Customers love it
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Some boring comments about javascript
• … cross-browser
• … memory leak
• … loading latency
• … « Javascript PhD »
• … ajax IDE
• … bugs (javascript is a dynamic language)
• … cross browser javascript debugger
• … security
• …
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The solution – First step
• Build the prototype of the application
– It is really fun
– Everybody will admire you
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The solution – Second step
• Your customer purchases : leave the project :-)
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But I’m nota coward
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Do something else
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But What ?
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My manifest
• I want a technology that
– helps to code stable, efficient and cross-browser applications
– Is a friend to me as a developer
• Compatible with IDE, support debugging, refactoring, strong typing…
• The base line could be : « Good for the user, good for the developer »
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That is what GWT
is !
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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Démonstrations
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Demonstrations
• http://stuff.ongwt.com
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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GWT is simple
• Developing a web application with GWT is as simple as developing a Windows application with VB
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GWT is cheap
23 Google Confidential
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GWT cuts costs
• Building a GWT application is 5 times faster than building a J2EE application
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GWT applications are efficient
• Local computation, bandwidth optimization
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GWT is offline compatible
• A GWT application doesn’t need a server
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Compatible with mobile
27 Google Confidential
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GWT is MDI compatible*
• GWT applications could have windows residing under a single parent window.
*MDI : Multiple Document Interface
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GWT, better ergonomically
http://swissmiss.typepad.com/weblog/2007/11/task-clips.html
Web 1.0
GWT
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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The approach
• Code in java
• Compile the java to Javascript
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Hello World
• Demonstration
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How easy do you find GWT to use ?
Very Easy, Easy, Medium, Hard, Very Hard ?
33 Google Confidential
Source : http://www.ongwt.com/post/2008/02/21/How-easy-do-you-find-GWT-to-use
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BrowserIE, Firefox, Safari, Opera
BrowserIE, Firefox, Safari, Opera
RWA in JavaRWA in Java
Java Runtime LibraryJava Runtime Library
Architecture
java.langjava.lang
java.utiljava.util
Java.ioJava.io
Application code
GWT GUI LibraryGWT GUI Library
Panels
PopupStack
AbsoluteVertical
…
WidgetsButton MenuBar
Radio TreeCheck Table
TextArea ….
Javascript Application
GWT Runtime100Ko
GWTCompiler
GWTCompiler
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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Widgets : « 100% java »
• Demonstration (Kitchen Sink)
http://code.google.com/webtoolkit/examples/kitchensink/
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Third party GWT Widgets
• It is really easy to build its own widget
• Many libraries
– GWT Ext
– MyGWT
– GWT Rialto
– Tatami
– GWT Widget
– GWTaculous
– …
37 Google Confidential
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History support
• « Single Page Interface » with history support !
• Demonstration (Kitchen Sink)
• Code :
History.addHistoryListener(myCommand);
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RPC Support (JSON/XML-RPC)
• AJAX is a story of asynchronous request
– With GWT, it is simple !
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I18N/L10N support
• Simple and powerful
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GWT is compatible with unit testing
• Compatible with Junit
• Compatible with Selenium
41 Google Confidential
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Cross browser, cross platform
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CSS
• GWT widgets are CSS compatible
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Debugger
• Demonstration
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Javascript integration
• JSNI, a clever API
• Many javascript libraries are already wrapped : Dojo, Extjs,…
• Demonstration
public static native void alert(String msg) /*-{ $wnd.alert(msg); }-*/;
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Optimization
• Compiled javascript is optimized
• Only the necessary javascript is downloaded by the browser
– IE downloads only javascript for IE, Firefox downloads only javascript for Firefox
– Unused APIs are removed from the compiled javascript
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Good scalability
• GWT server could be stateless
• No more session affinity
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Tools
• GWT is supported by all the java IDE : Eclipse, NetBeans, IntelliJ IDEA, JDeveloper,…
• Advertisement : my favorite tool is GWT Designer
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GWT 1.4 is fast
• Example : ImageBundle, kind of database for images
– From 12 requests to 1 request…
ClippedImage timeIcon = new ClippedImage("icons.png", 22, 0, 22, 22);
http://roberthanson.blogspot.com/2007/02/gwt-clippedimage-optimizing-image.html
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2008 : GWT 1.5
• The Java 1.5 syntax is fully supported, including generics, enums, nice "for" loops, autoboxing, static imports, annotations, and so on
• The ability to subclass JavaScriptObject for very straightforward JavaScript interop
• Thurs, Mar 6 2008 : GWT 1.5 M1 is available for download
50 Google Confidential
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Google Gadget with GWT
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Gadget definition
• <Module> <ModulePrefs title="Hello World” author=“Didier Girard” author_email=“[email protected]”> </ModulePrefs> <Content type="html"> <![CDATA[
Your application goes here ]]> </Content></Module>
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Gadget definition with GWT : 1 line
• <Module> <ModulePrefs title="Hello World” author=“Didier Girard” author_email=“[email protected]”> </ModulePrefs> <Content type="html"> <![CDATA[
<script src="http://..../com.mycompany.project.ImageViewer-xs.nocache.js">
</script> ]]> </Content></Module>
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Opensocial
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Who's Using It?
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Opensocial Definition with GWT :2 lines
• <Module> <ModulePrefs title="Hello World” author=“Didier Girard” author_email=“[email protected]”>
<Require feature="opensocial-0.7"/> </ModulePrefs> <Content type="html"> <![CDATA[ <script src="http://..../com.mycompany.project.ImageViewer-xs.nocache.js">
</script> ]]> </Content></Module>
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Simple, Efficient and Powerful ?
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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I need offline applications
• Do you ever miss your application
– Pubs
– Trains
• Are you sure that your user want its data in the cloud ?
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Classic web architecture
BrowserBrowser ServerServer
DataBaseDataBase
HTTP
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My needs in offline mode
BrowserBrowser ServerServer
DataBaseDataBaseDataBaseDataBaseServerServer
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I need
BrowserBrowser ServerServer
DataBaseDataBase
Install
DataBaseDataBaseServerServer
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The solution
• Google Gears
– Browser Plugin (FireFox, Internet Explorer)
– Features:
• LocalServer (“programmable cache”)
• Database
• Worker Threads for JavaScript
• http://gears.google.com
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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Architecture
65 Google Confidential
BrowserBrowser GearsGears
Javascript API
Javascript API
Your GWT ApplicationYour GWT Application
Your JS Application
Your JS Application
DojoDojoGWT Wrapper
GWT Wrapper
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Demo
• Live coding
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Perspectives of Gears : future APIs
• Notification API
• Crypto API
• Factory API updates
• Blob API
• Logging API
• Messaging API
• Location API
• Desktop Shortcut API
• Image Manipulation API
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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Think differently!
• Rethink application ergonomic.
• Forget browsing
• MDI is possible
• Stateless server, statefull client
69 Google Confidential
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Misc
• DOM manipulation is costly
– Your user can have : « slow script message »
– -> Use « IncrementalCommand » (DEMO)
• No need to send tones of asynchronous request
• Deal with RPC error by subclassing AsyncCallback
• Forget javascript
• Use Selenium (DEMO)
• Use Maven
70 Google Confidential
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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You must used java on the server
• No, GWT is server free
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Compiled javascript is impossible to debug
• It is possible to change compilation option
• But you never need to it,
• -> Demo
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GWT applications are heavy
• Compiled javascript is light and gzippable
– KitchenSink is around 60Ko !
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GWT is HTML incompatible
• Wrong
– It is possible to include GWT components in a standard HTML page
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GWT applications are applets
• Applets, no thanks :-)
– Java is compiled to javascript !
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Content
• Demonstrations
• Why GWT ?
• GWT features
• Google Gears
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Who are the challengers
• Silverlight
• AIR/Flex
• Firefox with the XUL/Prism stuff
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GWT and Gears
79 Google Confidential
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GWT : THE Community
• Millions of downloads
• 12000 subscribers to the users forum
• 700 subscribers to the contributors forum
• Books
• Tons of articles
• Tons of tutorials
• Blogs
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Faster and faster
• GWT application are efficient
• It is 5 times faster to build a GWT application
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This might surprise you but
• This pair of tools is the least disruptive
– It is based on the most used langage : java
– It doesn’t challenge the current web architecture which is mainly based on browsers
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No Future
PHP, Struts, JSF, ASP.NET,…
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« GWT + Gears »
The browser is the platform !
I thank the GWT Team,I thank the community!
Reminder
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SFEIR
• 6 projects with GWT
– 5000 days of coding
– It is just fun
– Clients are very happy with their applications
– Our stack : GWT/Spring/Hibernate
• Jobs: [email protected]
85 Google Confidential
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Ressources
GWT :http://code.google.com/webtoolkit/
Forum :http://groups.google.com/group/Google-Web-Toolkit
GWT Blog : http://googlewebtoolkit.blogspot.com/
onGWT, Tracking news on GWT : http://www.ongwt.com/
GWT and GEARS : http://www.ongwt.com/post/2008/01/28/Presentation-%3A-Gears-and-GWT