2015 UJUG, MVC 1.0 portion

MVC 1.0

Manfred Riem (@mnriem)Oracle

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Agenda

MVC

MVC 1.0 JSR

Some examples

MVC tooling

Questions and Answers

1

2

3

4

5

E


What is MVC?

• MVC is a pattern used to implement a user interface (UI).

• It consists of 3 major components

–Model (M)

– View (V)

– Controller (C)

• Each of the components has a distinct responsibility which is covered in the next slides


The M(odel) in MVC

• The model is the interim state you want to keep when you are building an application that shows a user interface

• Examples

–Who is logged in

–What are they trying to buy

–What page are they on in a multi page flow


The V(iew) in MVC

• The view is what your user interacts with

– In a web application that would be the web page or web pages• your JSP page

• your CSS styles

• your JavaScript

– In a thick client scenario it would be the entire UI

– In an embedded scenario it could be the touch screen, hardware buttons etc.


The C(ontroller) in MVC

• The controller is the work horse of the pattern, as it:

– Executes the business logic• Run a credit card transaction

– Updates the model• Mark the transaction as successful in the model object

– Ask the view to render itself• Shows the transaction was successful


Different styles of MVC

• Component-based MVC

• Action-based MVC

• Other styles


Component-based MVC

• A specific style of MVC made popular by component frameworks

• Controller provided by the framework

• Some examples

– Java Server Faces (in the JavaEE platform)

– Seam (discontinued)

–Wicket

– Tapestry

– Apache Click (retired)



Action-based MVC

• Controller(s) defined by the application

• Currently no JavaEE implementation

– Good news we are creating one!

• Some examples

– Struts 1 (end of life)

– Struts 2

– Spring MVC



Action-based MVC

–Manual request parameter processing

– No view kept around

– Limited support for re-usable behavior

– Developer responsible for all HTML / JavaScript

– No automatic input conversion

– No automatic input validation

– Request centric

Component-based MVC

– Automatic request parameter procession

– View kept around

– Component libraries that implement re-usable behavior

– Components render HTML / JavaScript

– Automatic input conversion

– Automatic input validation

– Page centric

Compare and contrast


Agenda

MVC

MVC 1.0 JSR

Demos

Recap


1

2

3

4

5

E


The MVC 1.0 JSR

• It really is the “Action-based” MVC 1.0 JSR

• Where it this coming from?

– JavaEE 8 survey

– Talking to our customers

– UI landscape is not one size fits all

• Who is supporting it?


List of supporters

• Joshua Wilson (Red Hat)

• Woong-ki Lee (TmaxSoft)

• Josh Juneau

• Fabio Velloso (SouJava)

• Yara Senger (SouJava)

• Bruno Souza (SouJava)

• Markus Karg

• Antonio Goncalves

• Rajmahendra (JUGChennai)

• Francisco Sokol

• Werner Keil

• Martijn Verburg (London Java Community)

• And of course Oracle

(see JCP page)


Where and how?

• Where are we at?

– The first Early Draft has just been published

–Our first Milestone release is available

• How can I help?– Join the [email protected] mailing list and comment

– Participate in the Adopt-a-JSR program (JUGs)

– Test out milestones / snapshots from the RI website (http://ozark.java.net) and file issues if something is not working

– Tweet, blog, socialize to raise awareness about MVC 1.0

mailto:[email protected]

http://ozark.java.net


An example about the EG process

• How are we going to protect against Cross-Site Request Forgery?

• Since the [email protected] mailing list gets every mail the EG sends you can follow all the discussions happening

• What do you think?

– Tell us on the mailing list

– Tweet about it

– Talk to me after the session

• Why do I ask?



Agenda

MVC

MVC 1.0 JSR

Demos

Recap


1

2

3

4

5

E


Demos

• Switching gears and showing you where we are at!


Agenda

MVC

MVC 1.0 JSR

Demos

Recap


1

2

3

4

5

E


Recap

• Doing MVC now is not a bad idea, because we are:

–We are leveraging CDI

–We are leveraging Facelets

–We are delivering an easy migration path if you are using JSPs

–We will be leveraging Servlet 4.0 (ServerPush)

• Can you get involved? Yes, how:

– Join our users mailing list

– Tweet about MVC

– Blog about MVC

– Test out SNAPSHOT and milestone builds from https://ozark.java.net

https://ozark.java.net


Recap (continued)

• View Engines

– JSP

– Facelets

– FreeMarker*

–Mustache*

– Thymeleaf*

– Velocity*

– Handlebars*

* Delivered and supported by MVC community, not required by the MVC specification


Links

• MVC specification

– Website http://mvc-spec.java.net

– Users Mailing List [email protected]

• MVC implementation

– Website http://ozark.java.net

– Users Mailing List [email protected]

• Spec leads

– Santiago (@spericas)

– Manfred (@mnriem, https://www.java.net/blogs/mriem, http://mvc.zeef.com/manfred.riem )

http://mvc-spec.java.net


http://ozark.java.net


https://www.java.net/blogs/mriem

http://mvc.zeef.com/manfred.riem


Questions?

• Ask them now

• Talk to me afterwards

Date post:	17-Jul-2015
Category:	Technology
Upload:	mnriem
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2015 UJUG, MVC 1.0 portion

Technology