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Slides del talk tenuto a Pordenone in occasione dellgli AppDays Intorduzione a GWT.
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Alb
erto
http://github.com/jooink
http://www.jooink.com
http://jooink.blogspot.com
Fran
cesc
a
+FrancescaTosi
@francescatosi
http://github.com/jooink
http://www.jooink.com
http://jooink.blogspot.com
GD
G F
irenz
e
www.gdg-firenze.info
+GDG-Firenze
GW
T co
s’è
Google Web Toolkit (GWT) is an open source Java software development kit that makes writing AJAX applications like Google Maps and Gmail easy for developers.
http://www.gwtproject.org/
GW
T St
ats Official GWT Report by Vaadin
[2012] - https://vaadin.com/gwt-report-2012-portlet/download/1871870899/Future-of-GWT-Report-2012.pdf
[2013] - (del 10/04/2014 → GWT in crescita)https://vaadin.com/documents/10187/42fbbec4-51c8-426b-8aa8-fe46129353a3
GW
T St
ats
E’ uno fra i framework più
utilizzati
http://zeroturnaround.com/rebellabs/the-curious-coders-java-web-frameworks-comparison-spring-mvc-grails-vaadin-gwt-wicket-play-struts-and-jsf/
GW
T St
ats
Come viene principalmente
utilizzato
GW
T St
ats
Browser & platform support.
GW
T St
ats GWT è
molto usato in Europa
GW
T St
ats GWT
why i love it ;-)
GW
T St
ats GWT
the dark side
right
for ?
GW
T St
ats as of Q4/2012
● SDK downloaded over 1 million times● 100,000+ Active Developers● Deep Integration with Eclipse, IntelliJ, Spring STS/Roo● Used by Google products such as AdWords, Flights,
Wallet● Fun things: GwtQuake, Angry Birds for the Web● GWT Today is a mature, high quality, code base.
... n
ot a
Fra
mew
ork Frameworks that may help
https://github.com/ArcBees/GWTPmodel-view-presenter framework
http://www.jboss.org/erraiCDI, and JPA for GWT
http://www.tessell.org/app framework (on gwt-pectin)
Ecos
yste
mSencha’s GXT - http://www.sencha.com/products/gxt/
https://vaadin.com/gwt
http://code.google.com/p/smartgwt/
Why
Why?
FOSS
The GWT Steering committee was founded in 2012 to help the GWT project become an even bigger success as an open source project.
● Ray Cromwell, Google● Artur Signell, Vaadin● Colin Alworth, Sencha● Mike Brock, RedHat● Thomas Broyer● Stephen Haberman, Bizo● Daniel Kurka, Google● Christian Goudreau, Arcbees● Konstantin Solomatov, Jetbrains
Evol
ving
& M
atur
e Rev. Improvements
2006 GWT 1.0
2007 GWT 1.3/GWT 1.4 First Open Source Release, OSX support / JUnit and ImageBundle
2008 GWT 1.5 Java 1.5 support, Overlay Types, DOM API, CSS Themes, Linkers
2009 GWT 1.6/GWT 1.7GWT 2.0
EventHandlers, EMMA Support, WAR support, Parallelized Builds/Newer browser support, IE8, GPE and AppEngine/DevMode, DraftCompile, UIBinder, LayoutPanel, CodeSplitter, ClientBundle, CssResource
2010 GWT 2.1 RequestFactory, Editor Framework, Validation, MVP, Cell Widgets
2011 GWT 2.2/GWT 2.3GWT 2.4
GWT Designer, HTML5 support/Better AppEngine integration/Maven and RequestFactory enhancements
2012 GWT 2.5 SuperDevMode, Elemental, UiRenderers, FragmentMerging, ClosureCompiler
2013 GWT 2.5.1 ….
2014 GWT 2.6 ….
Bro
wse
rs
Bro
wse
rs
xché
una codebase e tante 'incarnazioni' dell'applicazione.
Bor
n to
be
...Why GWT? The beginnings of rich internet applications started taking off in 2004-2005 with Gmail/Google Maps. jQuery didn't even exist yet. There was a vacuum for tools to build large scale web applications, and leveraging the already mature Java toolchain of IDEs, libraries, build tools, testing frameworks, made good sense.
Ray Cromwell
Now
aday
s ● Plethora of languages compiling to js (..., python, C/C++, Ocaml, Haskel, ...)
● Good and awesome js libraries & frameworks
Closure Tools
Seco
ndo
noi
● non tutte le applicazioni sono uguali
● ed alle volte alcune richiedono strumenti inustitati
GW
T-B
oofc
vGWT-Boofcv sample at:http://goo.gl/3IJQgs
Mar
ker B
ased
AR
http://code.google.com/p/gwt-webgl/http://code.google.com/p/gwt-nyartoolkit/
http://picshare.jooink.com
Mob
ile (&
tab)
too
Com
e Fu
nzio
na
<video/>
<canvas/>
http://code.google.com/p/gwt-nyartoolkit/
Ny
HTTP
java
→ G
WT
Using Java libraries into the browser
JS →
GW
T
Using js libraries with java
Dee
per
Deeper.
GW
TGWT is a toolkit to develop Ajax web application with Java.
The programmer writes Java code and this code is translated into HTML and Javascript via the GWT compiler.
The compiler creates browser specific HTML and JavaScript to support all the major browsers correctly.
Tool
s in
the
Tool
kit
+ GWTc, compiler Java to Javascript+ Emulated JRE+ Web UI class library (Widgets)+ Eclipse Plugin, SpeedTracer, Designer
It's open source, completely free, and used by thousands of developers around the world (in Google AdWords,Orkut,Blogger,Groups)
Com
pile
r GWT compiler
● java to javascript optimizing compiler
● translates java AST into js AST
● splits code into fragments to improve loading performance
Link
er● responsible for the final form of the generated js
xsiframe is the standard one
there are linkers for generating web-workers, gadgets, chrome extensions, …
defe
rred
bin
ding
Deferred Binding:feature of the GWT compiler that works by generating many versions of code at compile time, only one of which needs to be loaded by a particular client during bootstrapping at runtime.
Each version is generated on a per browser basis, along with any other axis that your application defines or uses.
RPC CallsWidgets tuned for specific browsersInternationalization
defe
rred
bin
ding
Deferred binding has several benefits:
● Reduces the size of the generated JavaScript code (downloaded by each client) - including just the code needed to run the browser/locale instance (used by the Internationalization
module)● Automatic generation of code (saving development time) to
implement an interface or create a proxy class (used by the
GWT RPC module)● Since the implementations are pre-bound at compile time,
there is no run-time penalty to look up an implementation in a data structure as with dynamic binding or using virtual functions.
Emul
ated
JR
EGWT includes a library that emulates a subset of the Java runtime library.
http://www.gwtproject.org/doc/latest/RefJreEmulation.html
InputStream
Threads ?
JNSI GWT borrows from the Java Native Interface (JNI) concept to
implement JavaScript Native Interface (JSNI).
Writing JSNI methods is a powerful technique, but should be used sparingly because writing bulletproof JavaScript code is notoriously tricky.
Needed for JSO (Javascript Overlay Types)
JNSI
public static native void alert(String msg) /*-{ $wnd.alert(msg);}-*/;
$wnd: the root browser window GWT widgets are being rendered to
$entry(..): method that makes code reentry safe.
http://www.lustforge.com/2012/11/11/gwt-jsni-variables-an-exhaustive-list/http://www.gwtproject.org/doc/latest/DevGuideCodingBasicsJSNI.html
Wid
gets UiComponents
http://www.gwtproject.org/doc/latest/RefWidgetGallery.html
2.0+ LayoutPanelshttp://www.gwtproject.org/doc/latest/DevGuideUiPanels.html#LayoutPanels
from the Jul 2013 - GWT Meetup
What are some of pain points or decisions bad in hindsight?...● Bad out of box UI
...
SmartGWT, GXT
UiB
inde
r ● The UiBinder is a framework designed to separate Functionality and View of User Interface.
● The UiBinder framework allows developers to build gwt applications as HTML pages with GWT widgets configured throughout them.
● The UiBinder framework makes easier collaboration with UI designers who are more comfortable with XML, HTML and CSS than Java source code
● The UIBinder provides a declarative way of defining (parts of the) User Interface.
● The UIBinder seperates the programmic logic from UI.
● The UIBinder is similar to what JSP is to Servlets.
UiB
inde
r● DSL (xml) to lay-out (declaratively) widgets
● no loops, no conditionals, no if statements
● UiBinder allows you to lay out your user interface.
● (offers direct support for internationalization)
GW
T - R
PC
Lets the client and the server to exchange java objects over http.
Bat
tlePl
an Domani:
● Codelab 2h: GWT mobile app10:30 → 12:30
● Codelab 4h: GWT hands-on14:00 → 18:00
