vaadin - rich web applications in server-side java without plug-ins or javascript
DESCRIPTION
Get introduced to the Vaadin Web framework by one of its core developers, Joonas Lehtinen. The Vaadin framework provides a desktop-like programming model on the server for creating Rich Internet Applications (RIAs) in plain Java - without the need for HTML, XML, plug-ins or JavaScript. In this session, Joonas lays out the key concepts of the server-side RIA development model and compares it to client-side RIA. To demonstrate the use of framework, an example application is developed during the session step-by-step. The presentation is concluded with pointers on how to start developing your own applications with Apache-licensed Vaadin-framework.TRANSCRIPT
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Joonas Lehtinen, PhDVaadin Ltd - CEO
Rich Web Applications in Server-side Java without
Plug-ins or JavaScript
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Vaadin is a UI framework
for desktop-like web apps
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New configs, taglibs and syntax!?!
JavaScript,DOM, Applet,plugins?
No! This is Java. Nothing else.
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htmljava
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healthcare portal, 100 kloc of perl, .. web 1.0, netscape, ie5, ie6, ...
1998
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healthcare portal, 100 kloc of perl, .. web 1.0, netscape, ie5, ie6, ... object oriented design, desktop, Java, U and I ...thinking of
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object oriented design, desktop, Java, U and I ...thinking of
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object oriented design, desktop, Java, U and I ... desktop programming paradigm for web! found
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desktop programming paradigm for web! found millstone ajax google web toolkit re-released as
2000
2002
2005
2008
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millstone ajax goolge web toolkit re-released as
2009
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is there a ?
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ApacheLicense
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Discussion
VaadinBig picture, Extending, Getting started
Server-side RIAWhat is it? Pros & cons?
In practiceCoding a Vaadin application step-by-step
Contents
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Server-side RIA
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?Rich Internet Application
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an application thatmakes developers rich
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if they bill by hour
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Architecture
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“Web 1.0”
DOM
Client Server
ViewHTML Page
over HttpResponse
Controller
Model
Parameters overHttpRequest
DB2
3
4
5
1
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client-side ria
fat client
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Client-side RIA
DOM
Client Server
View
Controller
Model
DB2
3
4
5
1
Requested datato view as
XML / JSON
Changes to modelencoded as parameters
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programming web is
not easy
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different featuresin different browsers
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different performancein different browsers
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different bugsin different browsers
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Google Web Toolkit
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Java toJavaScriptCompiler
Subset of
java.lang, java.util
Widgetset
Your Application UI
IE6
IE7
Firefox
Safari
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simpler• Java only• forget the web
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cost-effective stop debugging JavaScript spaghetti
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modular extensible♲
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Building wonderful apps doesn’t require writing fat web clients.
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server-side ria
thin client
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Server-side RIA
DOM
Client Server
ViewHTML Pageover HttpResponse
Controller
Model
Parameters overHttpRequest
DB4
5
6
2
Term
inalAdapter
Term
inalAdapter
Automated bythe RIA framework
3
7
1
9
8
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Server-side RIA
DOM
Client Server
ViewHTML Pageover HttpResponse
Controller
Model
Parameters overHttpRequest
DB4
5
6
2
Term
inalAdapter
Term
inalAdapter
Automated bythe RIA framework
3
7
1
9
8
Handled by the framework
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Java
modularextensible
cost-effectiveno JavaScript debugging
simplerforget the web
the benefits of Java
♲tiistaina 14. syyskuuta 2010
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even simpler• forget the client-side • synchronous• server resources
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more flexible• all Java tools and libraries• any JVM language
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more secure• code stays in server• less web services
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not as scalablestoring state in server memory limits number of concurrent users
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A server with 16GB memory can handle 50.000 concurrent 250kB sessions
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no offline modeserver is always required
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In practice
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Seeing is believing
© National Geographic Channel 2010
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What can it do in 20 minutes?
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Demo as videohttp://www.youtube.com/watch?v=u-a3VQF90kw
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Vaadin
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all benefits of• server-side ria• gwt
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demo
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Vaadin UI component architecture
“UI Component”• Button, Table, Tree, ...• Server-side data• Full Java API
Java
• Google Web Toolkit
“Widget”• Client-side peer for
the component• Runs on JavaScript
HTTP(S)
Java
• Compiled with JDK
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thanks to GWT, creating new ui components is really easy
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directory
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channel fordistributingVaadin add-ons
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ui components, data sources,
themes, tools, ...
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EclipseMaven
Netbeans[Spring Roo]
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ServletPortlet 1.0Portlet 2.0
App Engine
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gettingstarted
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Book ofVaadin
Free as
PDFtiistaina 14. syyskuuta 2010
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By Marko Grönroos
ABOUT VAADIN
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#85
Getting Started with VaadinCONTENTS INCLUDE:
About VaadinCreating An ApplicationComponents Layout ComponentsThemesData Binding and more...
Vaadin is a server-side Ajax web application development framework that allows you to build web applications just like with traditional desktop frameworks, such as AWT or Swing. An application is built from user interface components contained hierarchically in layout components.
In the server-driven model, the application code runs on a server, while the actual user interaction is handled by a client-side engine running in the browser. The client-server communications and any client-side technologies, such as HTML and JavaScript, are invisible to the developer. As the client-side engine runs as JavaScript in the browser, there is no need to install plug-ins. Vaadin is released under the Apache License 2.0.
Figure 1: Vaadin Client-Server Architecture
If the built-in selection of components is not enough, you can develop new components with the Google Web Toolkit (GWT)
Figure 2: Architecture for Vaadin Applications
Hot Tip
You can get a reference to the application object from any component attached to the application with
Event ListenersIn the event-driven model, user interaction with user interface components triggers server-side events, which you can handle
Web BrowserClient-Side Engine
JavaWeb Server
VaadinUIComponents
YourJavaApplication
WebService
EJB
DB
Servlet Container
UserApplication
EventListener
DataModel
ApplicationThemes
ApplicationResources
DefaultTheme
FileResources
ExternalResources
Database
DataBinding
Inherits Events Changes
AJAX Requests
Inherits
UIComponent
JavaServlet
ApplicationClass
Web BrowserClient-Side Engine
brought to you by...
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QuestionsComments
[email protected]+358-40-5035001skype://joonaslehtinen
tiistaina 14. syyskuuta 2010