MVC(Model View Controller),Web,Enterprise,Mobile

Web, Enterprise and Mobile: Seen in Kohana php, .Net, iphone, and Android development. For BarCamp Cameroon 2010 by Njie-Litumbe.L.Nara Developer, AfroVisioN Group MVC(Model View Controller)

Many computer systems rely on retrieving data from a data store and displaying for the user.
User changes data and the data is updated to the store
Key flow: Data store and User Interface
Temptation/But Natural: Tie the Data store and User Interface
Problem:
1.The user interface changes more than data store
2.Mixing business logic and presentation
The Purpose

User interface logic tends to change more frequently than business logic, especially in Web-based applications.
User interface code tends to be more device-dependent than business logic
Application may display the same data in different ways.
Separate development effort.
Other consequences

How do I separate Presentation ,Logic and Data for a near-perfect, reliable and future-proof solution?
QUESTION…

M odel, V iew, C ontroller
Model-View-Controller is a fundamental design pattern for the separation of user interface presentation from business logic and data.
SOLUTION…

Software Architecture(Engineering)
Object Oriented
Orderly
Code Reuse
What MVC Is…

MVC Is 31 Years Old!
Smalltalk-80 (circa 1980)
MVC first discussed in 1979 by Trygve Reenskaug
MFC (Document/View)
Java’s Swing
Apple’s Cocoa (Core Data)
MVC is suited for GUI(Graphical User Interface) Development!
History

More than 10 GUI frameworks (enterprise)
More than 15 web-based frameworks Implement MVC(web).
Made popular by Ruby on Rails
Developing applications for iphone and Android phones use the MVC(more tight coupling) design pattern
MVC where…Almost Anywhere

Data Storage/Access
Often Data source backed
MySQL, MSSQL, Web Service, it doesn’t matter…
Manages the behavior and data of the application domain, responds to requests for information about its state (usually from the view), and responds to instructions to change state (usually from the controller).
Simply, they represent the data your application manages
MODEL

HTML Templates:
All formatting(css,js,jq etc) related code belongs here.
The view manages the display of information.
VIEW

Be concern…
Process user inputs, communicate with Models and Views
Acts Like a Betweener
Much of the application’s core logic
Invoke model, assign values to views
The controller interprets the mouse and keyboard inputs from the user, informing the model and/or the view to change as appropriate.
CONTROLLER

CONTROLLER -Input Filters(authentication…) -Action Dispatching -Output filters(Compression, cache…) MODEL Data Persistence -Relationships REQUEST RESPOND Database Only I know the DB VIEW -Presentation -Layout -Graphic Interface

The Model does not depend on view nor the controller but the controller and view depend on model.
Only the model has access to the database
Only Controller can request the Model to change state.(the view may ask about It’s state).
MVC due to it’s popularity this points have been misrepresented;but the order it tries to bring should be the engineers focus.
Must be Clear….

With MVC It is easier to look for errors, by knowing the particular file(object) either it’s a View, Controller or Model than by knowing the line from which the error is coming from?
With MVC you can do a design for one app and implement over several different platforms easily.
For example the application which was developed at the AVNLab for iphone, and android.It is a clear demo of MVC for mobile.
With MVC design pattern don’t bother about your language expertise. You would find your self translating from one framework or one mobile phone development plateform to another rather than re-coding . As I moved from Code Igniter to Kohana ;).
Do you know…..

We have seen that with MVC:
Good architectural design
Code is organized and structured
Easy code maintenance
Because of abstraction, better strategic positioning of code will minimize the hunt for places to change
Easy to extend and grow
Modify parent classes, drop in new controller, etc.
Ease of Testing
Model can be tested separately from the user interface.
Why MVC?

Supports multiple views: Because the view is separated from the model and there is no direct dependency from the model to the view, the user interface can display multiple views of the same data at the same time. For example, multiple pages in a Web application may use the same model objects.
Accommodates change: User interface requirements tend to change more rapidly than business rules. Users may prefer different colors, fonts, screen layouts, and levels of support for new devices such as cell phones or PDAs. Because the model does not depend on the views, adding new types of views to the system generally does not affect the model. As a result, the scope of change is confined to the view.
Easier support for new types of clients: To support a new type of client, you simply write a view and controller for it and wire them into the existing enterprise model.
Development of the various components can progress in parallel: Once the interface between the components is clearly defined. The designer can be doing the interface while the developer does the logic; It is merged later.

Implementing Model View Controller in Kohanaphp.
Simple Information collection form:
Demo of MVC for Barcampcameroon 2010: http://njielitumbe.livejournal.com
Implementing Model view Controller in ASP.NET
http://msdn.microsoft.com/en-us/library/ff647462.aspx
* Implementing Model View Controller for iphone and Android with Jqtouch(written by mambenanje at AfroVisioNgroup lab in about 3 hours)
- http://www.packtpub.com/article/build-iphone-android-ipad-applications-jqtouch-jquery
EXAMPLE CODE

http://msdn.microsoft.com/en-us/library/ff649643.aspx
With 6,203,493 and still counting,
Google is your Friend  : http://www.google.com/search?hl=en&q=mvc
Afrovisiongroup:www.afrovisiongroup.com
Wikipedia: http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller

REFERENCES

THANK YOU 

http://mambenanje.blogspot.com	455
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http://mambenanje.blogspot.fr	12
http://mambenanje.blogspot.ca	10
http://mambenanje.blogspot.de	9
http://paper.li	6
http://mambenanje.blogspot.in	5
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MVC(Model View Controller),Web,Enterprise,Mobile

by naral on Jun 19, 2010

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