MVC 1.0 Manfred Riem (@mnriem) Oracle Geertjan Wielenga (@geertjanw) Oracle Copyright © 2014,...

MVC 1.0

Manfred Riem (@mnriem)Oracle

Geertjan Wielenga (@geertjanw)Oracle

Copyright © 2014, Oracle and/or its affiliates. All rights reserved. |


Safe Harbor StatementThe following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.

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Agenda

MVC

MVC 1.0 JSR

Some examples

MVC tooling

Questions and Answers

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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

Some examples

MVC tooling


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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 JSR has been approved–We have the EG up and running

• How can I help?– Join the [email protected] mailinglist and comment– Participate in the Adopt-a-JSR program (JUGs)– Test out snapshots (once available) 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• We are currently in the middle of a discussion about the following

question: “Do we build on top of JAX-RS or not?”• Since the [email protected] mailing list gets every mail the EG sends

you can follow this discussion as well• What do you think?– Tell us on the mailing list– Tweet about it– Talk to me after the session

• Why do I ask?



Another couple of things being discussed• Programmatic API so you can change the runtime behavior • Type conversion of form inputs• An SPI to plug in a different view technology– Velocity– Freemarker– Thymeleaf–… Your view technology …


Agenda

MVC

MVC 1.0 JSR

Some examples

MVC tooling


1

2

3

4

5

E


Safe Harbor StatementThe following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.

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A rough JSP example• Initial JSP page• CDI Managed Bean (also known as the the controller)• Result JSP page


Initial JSP page<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html> <head> <title>Rough example</title> </head> <body> <form action=”/rough-example/form1a.jsp”> <input id="input1" value="#{roughExampleBean.value}"/> <input id="submit" type="submit" value="Submit"/> </form> </body></html>


CDI Managed Bean (the controller)• @Named("roughExampleBean”)

@RequestScopedpublic class RoughExampleBean implements Serializable {

private String value;

@Path(value = "/form1a.jsp”) public String form1(@Inject HttpServletRequest request) { String input1 = request.getParameter("inputText1"); setValue("We set input1 manually to - " + input1); return "/form1b.jsp”; } … omitted getter/setter methods …}


Result JSP page<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN” "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html> <head> <title>Rough example result page</title> </head> <body> We did a POST to an action based URL and the result is:

#{roughExampleBean.value} </body></html>


A rough Facelet example• Initial Facelet page• CDI Managed Bean (also known as the controller)• Result Facelet page


Initial Facelet page<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html> <head> <title>Rough example</title> </head> <body> <form action=”/rough-example/form1a.xhtml”> <input id="input1" jsf:value="#{roughExampleBean.value}"/> <input id="submit" type="submit" value="Submit"/> </form> </body></html>


CDI Managed Bean (aka the controller)• @Named("roughExampleBean”)



@Path(value = "/form1a.xhtml”) public String form1(@Inject HttpServletRequest request) { String input1 = request.getParameter("inputText1"); setValue("We set input1 manually to - " + input1); return "/form1b.xhtml”; } … omitted getter/setter methods …}


Result Facelet Page<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN” "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html> <head> <title>Rough example result page</title> </head> <body> We did a POST to an action based URL and the result is:

#{roughExampleBean.value} </body></html>


Another Facelets example• Template page• Initial Facelet page• CDI Managed Bean (also known as the controller)• Result Facelet page


Template Page<html> <h:head> <!– Put your CSS / JavaScript here --> </h:head> <h:body> <div id="content" class=”content”> <ui:insert name="content">Main Content</ui:insert> </div> </h:body></html>


Initial Page (using template)<html> <h:body> <ui:composition template=”template.xhtml”> <ui:define name="content”> <form action=”/rough-example/form1a.xhtml”> <input id="input1" jsf:value="#{roughExampleBean.value}"/> <input id="submit" type="submit" value="Submit"/> </form> </ui:define> </ui:composition> </h:body></html>


CDI Managed Bean (aka the controller)• @Named("roughExampleBean”)



@Path(value = "/form1a.xhtml”) public String form1(@Inject HttpServletRequest request) { String input1 = request.getParameter("inputText1"); setValue("We set input1 manually to - " + input1); return "/form1b.xhtml”; } … omitted getter/setter methods …}


Result page (using template)<html> <h:body> <ui:composition template=”template.xhtml”> <ui:define name="content”> We did a POST to an action based URL and the result is:

#{roughExampleBean.value} </ui:define> </ui:composition> </h:body></html>


Some brief examples@GET @Path(“mypath”)public String mypath(@Inject @HeaderParam(“myheader”) String header)

@POST @Path(“mypath2”)public String otherName(@Inject HttpSession session)

@PUT @Path(“mypath3/{mypath}”)public String myName(@Inject @PathParam mypath)


Some brief examples (continued)@GET @Path(“spec_lead”)@RolesAllowed(“spec_lead”)public String specLead()

@GET @Path(“eg_member”)@RolesAllowed(“eg_member”)@ServerPush({“my.css”, “my.js”})public String egMember()


Recap• Doing MVC now is not a bad idea, because we can:– Leverage CDI– Leverage Servlet 4.0 (ServerPush)– Leverage Facelets– Deliver an easy migration path if you are using JSPs

• 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 (once available)

https://ozark.java.net/


Agenda

MVC

MVC 1.0 JSR

Some examples

MVC tooling


1

2

3

4

5

E


MVC ToolingWhile it is not really part of the specification cycle perse we think to have tooling that allows you to work with MVC 1.0 is integral to a good developer experience

So I have invited Geertjan to be my co-speaker to cover ideas he has with respect to tooling and he will take it from here


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)

• Tooling– Geertjan (@GeertjanW, https://blogs.oracle.com/geertjan)

http://mvc-spec.java.net/


http://ozark.java.net/


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

https://blogs.oracle.com/geertjan


Questions?• Ask them now• Talk to us afterwards

Date post:	25-Dec-2015
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MVC 1.0 Manfred Riem (@mnriem) Oracle Geertjan Wielenga (@geertjanw) Oracle Copyright © 2014,...

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