Chapter I

Roberto Bifulco — Mon, 02/11/2008 - 15:06

As already said in the introduction, web applications had a large evolution in the past years. Figure 1 presents a schematic view of this evolution. During years, web applications passed from static pages, to dynamic ones. This evolution brings growing functionalities into web applications but also growing complexity for their realization.

The growing in complexity is the result of the different developing patterns: static pages are simple text, formatted through tags; dynamically generated pages are the output of a server side running program, that handles the HTTP requests and generates the appropriate responses. Dynamic pages are something more, they act as an active part in the delivery of the service, something like a complex client-server application. This approach requires that the design phase takes into account both the client side and the server side, making them the components that must interact to delivery the service. Just to clean any doubt, the key difference between dynamically generated pages and dynamic pages is that the first are a simple text-like interface to call functions on the server-side program, the latter contain itself part of the program logic, modifying its content without interaction with server and making requests to server only to fetch data.

With dynamic pages an entire new field of applications can be prospected. The old development patterns, delegating all the program logic at server side, were strictly linked to work with only one server, that was responsible for the execution of the application logic and for the fetching of the data. Dynamic pages, relying on their “embedded logic”, can use different servers to fetch data and combine them into a new rich application that enhances the user experience. This new approach, called “mash up” seems to be the next evolution of the web development.

Figure 2 shows this new approach in opposite to the old one: a page is built up using data from different servers, that are mashed through the page active logic. Actually it is not so simple to implement a page like this, some technical issues limit the possibilities of what a web page can do. While it is actually possible that the page makes asynchronous multiple requests for data fetching, there is the bigger limitation of the Same Origin Policy, that force a web page to make requests only to the server from which it was loaded [6]. This limitation was introduced for security reasons, in order to avoid unexpected malicious use of web page's active content (We will return on this topic later). How to avoid or modify this browsers' limitation is an open research topic.

Just to give an example of the new possible applications, we can imagine a travel reservation application that build, starting from information from hotels and travel obtained form specific companies web servers, a set of reservation for the travel and for the hotels, according to user needs.

This new technologies seem to give added value to the new ideas about the software deployment. The actual trend is to imagine the software as a service (SaaS). With dynamic pages SaaS becomes a really near reality, because dynamic pages are software that is deployed through the net, with user transparency. With new web applications software becomes a product given on demand, something like what happened in the first decades of the 20^th century with electric power for factories.

Instead of having the need to buy and deploy software to get a service, with SaaS users buy a service for whom the software is automatically deployed in a transparent way.

Figure 2: Actual web page and future web page

Figure 1: Web applications evolution

Printer-friendly version

49ers Red Jersey

49ers Red Jersey (not verified) — Thu, 01/12/2012 - 02:11

49ers Red Jersey
Alex Smith Jersey
Frank Gore Jersey
Anthony Davis Jersey
Michael Crabtree Jersey
Vernon Davis Jersey
Patrick Willis Jersey
Deion Sanders Jersey
Brian Westbrook Jersey
Isaac Sopoaga Jersey
Jerry Rice Jersey
Joe Montana Jersey
Mike Iupati Jersey
Nate Clements Jersey
Nate Davis Jersey
Roger Craig Jersey
Ronnie Lott Jersey
Steve Young Jersey
Taylor Mays Jersey

nfl jerseys suppliers Fashion

Anonymous (not verified) — Mon, 01/02/2012 - 08:03

nfl jerseys suppliers Fashion brand
wholesale coach bags the trend of fashion
coach outlet Don't miss the chance it's very good
coach outlet store comfortable with it
wholesale designer handbags well known great
coach handbags outlet attractive and reasonable price
cheap coach online shopping
coach outlet store may most likely need
coach handbag outlet A good thing
authentic nfl jerseys for sale fashion designed
cheap authentic nfl jerseys together with lifestyle

nfl jerseys

mostnfl (not verified) — Fri, 12/30/2011 - 14:31

New England Patriots Jerseys
Authentic New England Patriots Jerseys
Patriots Jerseys Sale
Premier New England Patriots Jerseys
Tom Brady Jersey
Wes Welker Jersey
Chad Ochocinco Jersey

New York Giants Jersey

mostnfl (not verified) — Thu, 12/29/2011 - 09:44

New York Giants Jersey ,Terrell Suggs Jersey The third kit will be worn for select Terence Newman Jersey matches during the upcoming Tony Romo Jersey season, the Timbers will continue to feature their green primary Tim Tebow Jersey jerseys and Rose Steve Young Jersey City Red secondary kits in 2012. Devin Hester Jersey

wedding dress incredible dreamlike

incredible wedding dress (not verified) — Mon, 12/05/2011 - 02:21

This is an stimulating time of year for 2010 brides – all of the top designers have just showing their latest collections of wedding gowns in New York, and it won’t be long before the styles hit the stores. This year the gowns were dramatic and eclectic, with a dissimilar flavor than this year’s wedding dresses wedding dresses . Read on for the scoop on the hottest looks for 201

cheap wedding dresseshttp://www.hoboview.com/site/comment/reply/1

0 brides.

The wedding gowns wedding gowns being sold this season have a strong leaning towards matte fabrics like chiffon and slender skirts. Not unfeigned for the most recent collection of gowns that was just shown. Brides who want a straighter skirt will surely have a great deal of choices, but most of the most recent gowns feature fuller and more dramatic skirts. One thing is for sure: the ballgown is back.

Designers were unquestionably showing dresses with classic ballgown lines, but a good deal of of the fuller skirts had a lot more detail than a traditionalisti ballgown. The drama on the bottom half of the gowns gowns was devised from masses of ruffles, big draped layers, special occasion dresses and even unbelievable pinwheels and three-dimensional flower appliques. Another ordinary look is a gown that is somewhat slender through the hips and then flares into an exaggerated trumpet skirt. The styles are unquestionably eye-catching and exuberant.

Speaking of ruffles, they are everyplace for next year’ wedding dresses with long sleeves discount bridesmaid dresses discount bridesmaid dressess gowns. Cascades of ruffles fall down a skirt into an unbelievable full skirt. Strapless gowns feature ruffles on the neckline. Designers were even showing ruffles on little bolero jackets and veils . One thing that these gowns are not is boring or shy.

Fabrics for 2010 bridal gowns bridal gowns are trending back towards the perennial favorites, brown cocktail dress satin and taffeta. This luxe fabrics are just right for the fuller skirts that are back in vogue. You are also seeing satin gowns embellished with accents such as beaded crystal straps, which pair perfectly with crystal bridal jewelry. This is a departure from the current season, which concentered wholly on fabric accents. Brides who love sparkle will be happy to see the return of crystal jewelry detailing on the bridal gowns !

Some of the 2009 gown trends have been carried into next year’s styles. Asymmetry is still all the rage. The one shoulder gown one shoulder gown sticks around for another season, but that is only the beginning. Designers went wild with asymmetrical draping and ruching on bodices and skirts. A love of interesting architecture in the way the fabric is hung and applied is still very popular. It is rare to see a gown that has plain fabric hung without a great deal of sort of folding, pleating, or gathering. One remarkable divergence is that the bridal designers have translated this conception from the soft chiffons of 2009 into the more significant satins of 2010.

One other important idea for 2010 bridal gowns is the conception of intentional imperfection. Vera Wang, informal plus size wedding dresses informal plus size wedding dresses in particular, focalized on creating gowns that were eclectic and not too “perfect”. This was achieved by using such fabrics as silk organza or tulle with raw torn edges in a utterly artful way. It is a style that when done with care may be rather striking and unique.

Picking out a wedding gown is always a very particular time in a bride’ simple wedding dresses simple wedding dresses simple wedding dresses s life. The styles that are fresh off the runway are chic, interesting, red formal dresses and rather beautiful. No matter what your taste is, simple wedding dresses you are sure to find an unbelievable dress among the most recent creations for 2010.

affordable cocktail dresses affordable cocktail dresses

fall bridesmaids dresses