Weblogic Authors: Yeshim Deniz, Elizabeth White, Michael Meiner, Michael Bushong, Avi Rosenthal

Related Topics: PowerBuilder

PowerBuilder: Article

The Next Paradigm Shift...

The Next Paradigm Shift...

First there were the thin clients. Not the Internet thin clients, I'm talking about the mainframe applications with dumb terminals. Everything ran on the server; the client was basically there only to display and for input from the user.

Then PCs came along and a paradigm shift occurred toward thick clients. Really thick clients in fact. Not only was the user interface running locally on the PC, but often so was the data access layer, with the application accessing local database files or perhaps a shared database file on the network. Key reasons for the shift were a better user experience and decentralization of development. PCs also tended to be cheaper and potentially faster than mainframe computing.

The pendulum then swung back toward the middle with the advent of client/server computing. If you're an old dog like me, that's when you first started using PowerBuilder. Client/server was an attempt to recentralize the storage of data (making the same data available to different applications simultaneously) while maintaining the rich user interface.

That was followed by another shift toward the start with the introduction of distributed computing. Folks began to realize that they not only needed to share the same data between different applications, they needed to be able to share the same business rules as well. So those business rules were also moved to the server side of the equation, just not necessarily to the same server that was hosting the database.

The pendulum then swung nearly back to its original starting point with the dawn of the Internet version of thin clients. Not fully back to the start: the user interface in the most rudimentary thin client Internet/intranet application is still significantly better than the mainframe dumb terminal days. But it in turn pales in comparison with what can be accomplished with a thick client. People were beginning to see large operating expenses related to the maintenance and upgrade of PCs. It was not uncommon to find that the installation of a new application installed files (e.g., DLLs) that were incompatible with those previously installed by an already installed application, or that two different applications required two different versions of a database client layer. Internet/intranet thin client applications would save the day by reducing application deployment costs to the client to near zero.

In a somewhat related scenario, there was also the introduction of mobile devices such as PDAs that could use Internet technology. While the thin client approach was of particular importance for these devices because of their more limited hardware capabilities, there was also the introduction of technology specialized for these devices that allowed them to run in an occasionally connected mode.

Thin client comes at a cost, though, and the costs have been primarily in the user experience and performance of the application. The thinner the client, the more work the server has to do and the more round-trips that have to be made between client and server to update the display. As DataFace notes in their "Benefits of Smart Clients" white paper: "A 6-processor web server is outgunned by 100 desktops."

So the pendulum started swinging back again. But just as the Internet thin client applications didn't mean a return to mainframe dumb terminals, the shift back toward thick client applications won't mean a return to client/server or distributed computing. The coming paradigm shift will be toward clients that strike the balance between thick and thin clients by being "smart" clients.

What a "smart client" paradigm attempts to do is combine the advantage of thick clients (a rich user experience) with the advantage of thin clients (ease of deployment). As Paul Kimmel noted in his developer.com article entitled "Smart Clients: Windows Forms Flexibility with Web Application Ease":

A smart client basically is a Windows [...] application that dynamically updates client assemblies....Your customers will get a Windows [...] application with all of the expressivity they will have come to expect, along with an ease of deployment like the Web provides.

A lot of the buzz surrounding smart clients has revolved around Microsoft's toolset. However, as Jonathon Walsh and Joe Misner note in their developer.com article "Smart Clients - A Practitioner's Point of View," smart client's can be developed with other tools:

Many equate Smart Client to a set of Microsoft .NET technologies. While the .NET Framework (Windows Forms) and the .NET Compact Framework provide the ability to develop Smart Clients with ease, other technologies can provide smart client applications by utilizing the same architecture.

Smart clients have a number of key ingredients (see, for example, David Hill's WebLog - Smart Clients for Smart Users or the MSDN Smart Client Definition).

  • Uses local resources: That's nothing more than saying that a smart client has a significant component that runs on the local machine. A smart client should be able to provide the same rich user experience as a traditional thick client application.
  • Connected: A smart client application, like the client/server, distributed, and Internet applications, does not run solely on the client, but is involved with data interactions with other computers in the network. The primary difference between, let's say, a traditional client/server application and a smart application is that a smart application will use nonproprietary standardized protocols for that communication (e.g., Web services).
  • Support for both standard and mobile devices: Depending on who is doing the defining, smart clients include clients that are capable of running on a variety of platforms.
  • Offline capable: Here's where smart clients break sharply from most of the previous paradigms. Smart clients are more similar to applications written for mobile devices in that they need to be able to continue operating while the client is offline.
  • Intelligent deploy and update: Perhaps bearing the most similarity to thin client applications, smart client applications should not be an installation and upgrade nightmare.
How does the Sybase toolset stack up? PowerBuilder and PocketBuilder are excellent tools for developing applications that provide a rich user experience running on the local machine. Both of those tools provide support for Web services to facilitate standard-based connectivity with other computers. Finally, PocketBuilder introduced support for a variety of devices. Those are all areas that you're probably already familiar with if you've been working with those tools for any length of time.

What about offline capability? Many of the issues associated with thin client applications revolve around the decision of whether to try to maintain state on the server and, if so, how to do so. Maintaining state on the server has a significant negative impact on the scalability of the application. However, if state is not maintained, a loss in connectivity can result in a loss of data. As DataFace notes in their white paper:

The obvious place to store state is on the client. It has plenty of disk space. There is no risk of interference with other users. Storage and retrieval of state can take place in parallel with other activities with invisibly small overhead.

Offline capability means that the user can work with the application locally, perhaps on a mobile or disconnected device, and only needs to go online long enough to finalize the transaction by transmitting the data. In an article in NetWork World, Anthony Norris - the director of commercial and e-commerce technology at FedEx Kinko's in Dallas - noted the importance of this capability for their "File, Print FedEx Kinko's" smart client application:

"That's a huge advantage," Norris says. "So in the case of File, Print FedEx Kinko's, you don't actually have to be connected to the Internet to use the software. You can start your print order, specify how you want it printed, and then queue it up for submission later when you're connected to the Internet. Business users traveling on an airplane won't have any trouble using our software, whereas with Citrix or a Web application, they can't do that. That's tremendously powerful - a huge value."

Sybase has been touting the benefits of "occasionally connected" applications for some time, and their Adaptive Server Anywhere and related replication technologies are well tailored to supporting such functionality.

That leaves "intelligent deploy and update." That's the one part of the "smart client" paradigm that is significantly different than previous technologies. Microsoft's .NET Framework implements this through "no-touch deployment." (A second generation version of this technology called One-Click will be part of the next major version of the .NET Framework.) David Hill describes this technology as follows:

More Stories By Bruce Armstrong

Bruce Armstrong is a development lead with Integrated Data Services (www.get-integrated.com). A charter member of TeamSybase, he has been using PowerBuilder since version 1.0.B. He was a contributing author to SYS-CON's PowerBuilder 4.0 Secrets of the Masters and the editor of SAMs' PowerBuilder 9: Advanced Client/Server Development.

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.

@ThingsExpo Stories
In his session at 21st Cloud Expo, Carl J. Levine, Senior Technical Evangelist for NS1, will objectively discuss how DNS is used to solve Digital Transformation challenges in large SaaS applications, CDNs, AdTech platforms, and other demanding use cases. Carl J. Levine is the Senior Technical Evangelist for NS1. A veteran of the Internet Infrastructure space, he has over a decade of experience with startups, networking protocols and Internet infrastructure, combined with the unique ability to it...
"There's plenty of bandwidth out there but it's never in the right place. So what Cedexis does is uses data to work out the best pathways to get data from the origin to the person who wants to get it," explained Simon Jones, Evangelist and Head of Marketing at Cedexis, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Large industrial manufacturing organizations are adopting the agile principles of cloud software companies. The industrial manufacturing development process has not scaled over time. Now that design CAD teams are geographically distributed, centralizing their work is key. With large multi-gigabyte projects, outdated tools have stifled industrial team agility, time-to-market milestones, and impacted P&L stakeholders.
"Cloud Academy is an enterprise training platform for the cloud, specifically public clouds. We offer guided learning experiences on AWS, Azure, Google Cloud and all the surrounding methodologies and technologies that you need to know and your teams need to know in order to leverage the full benefits of the cloud," explained Alex Brower, VP of Marketing at Cloud Academy, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clar...
Gemini is Yahoo’s native and search advertising platform. To ensure the quality of a complex distributed system that spans multiple products and components and across various desktop websites and mobile app and web experiences – both Yahoo owned and operated and third-party syndication (supply), with complex interaction with more than a billion users and numerous advertisers globally (demand) – it becomes imperative to automate a set of end-to-end tests 24x7 to detect bugs and regression. In th...
"Akvelon is a software development company and we also provide consultancy services to folks who are looking to scale or accelerate their engineering roadmaps," explained Jeremiah Mothersell, Marketing Manager at Akvelon, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
"MobiDev is a software development company and we do complex, custom software development for everybody from entrepreneurs to large enterprises," explained Alan Winters, U.S. Head of Business Development at MobiDev, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
SYS-CON Events announced today that CrowdReviews.com has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5–7, 2018, at the Javits Center in New York City, NY. CrowdReviews.com is a transparent online platform for determining which products and services are the best based on the opinion of the crowd. The crowd consists of Internet users that have experienced products and services first-hand and have an interest in letting other potential buye...
"IBM is really all in on blockchain. We take a look at sort of the history of blockchain ledger technologies. It started out with bitcoin, Ethereum, and IBM evaluated these particular blockchain technologies and found they were anonymous and permissionless and that many companies were looking for permissioned blockchain," stated René Bostic, Technical VP of the IBM Cloud Unit in North America, in this SYS-CON.tv interview at 21st Cloud Expo, held Oct 31 – Nov 2, 2017, at the Santa Clara Conventi...
SYS-CON Events announced today that Telecom Reseller has been named “Media Sponsor” of SYS-CON's 22nd International Cloud Expo, which will take place on June 5-7, 2018, at the Javits Center in New York, NY. Telecom Reseller reports on Unified Communications, UCaaS, BPaaS for enterprise and SMBs. They report extensively on both customer premises based solutions such as IP-PBX as well as cloud based and hosted platforms.
"Space Monkey by Vivent Smart Home is a product that is a distributed cloud-based edge storage network. Vivent Smart Home, our parent company, is a smart home provider that places a lot of hard drives across homes in North America," explained JT Olds, Director of Engineering, and Brandon Crowfeather, Product Manager, at Vivint Smart Home, in this SYS-CON.tv interview at @ThingsExpo, held Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA.
Coca-Cola’s Google powered digital signage system lays the groundwork for a more valuable connection between Coke and its customers. Digital signs pair software with high-resolution displays so that a message can be changed instantly based on what the operator wants to communicate or sell. In their Day 3 Keynote at 21st Cloud Expo, Greg Chambers, Global Group Director, Digital Innovation, Coca-Cola, and Vidya Nagarajan, a Senior Product Manager at Google, discussed how from store operations and ...
It is of utmost importance for the future success of WebRTC to ensure that interoperability is operational between web browsers and any WebRTC-compliant client. To be guaranteed as operational and effective, interoperability must be tested extensively by establishing WebRTC data and media connections between different web browsers running on different devices and operating systems. In his session at WebRTC Summit at @ThingsExpo, Dr. Alex Gouaillard, CEO and Founder of CoSMo Software, presented ...
WebRTC is great technology to build your own communication tools. It will be even more exciting experience it with advanced devices, such as a 360 Camera, 360 microphone, and a depth sensor camera. In his session at @ThingsExpo, Masashi Ganeko, a manager at INFOCOM Corporation, introduced two experimental projects from his team and what they learned from them. "Shotoku Tamago" uses the robot audition software HARK to track speakers in 360 video of a remote party. "Virtual Teleport" uses a multip...
A strange thing is happening along the way to the Internet of Things, namely far too many devices to work with and manage. It has become clear that we'll need much higher efficiency user experiences that can allow us to more easily and scalably work with the thousands of devices that will soon be in each of our lives. Enter the conversational interface revolution, combining bots we can literally talk with, gesture to, and even direct with our thoughts, with embedded artificial intelligence, whic...
SYS-CON Events announced today that Evatronix will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Evatronix SA offers comprehensive solutions in the design and implementation of electronic systems, in CAD / CAM deployment, and also is a designer and manufacturer of advanced 3D scanners for professional applications.
Leading companies, from the Global Fortune 500 to the smallest companies, are adopting hybrid cloud as the path to business advantage. Hybrid cloud depends on cloud services and on-premises infrastructure working in unison. Successful implementations require new levels of data mobility, enabled by an automated and seamless flow across on-premises and cloud resources. In his general session at 21st Cloud Expo, Greg Tevis, an IBM Storage Software Technical Strategist and Customer Solution Architec...
To get the most out of their data, successful companies are not focusing on queries and data lakes, they are actively integrating analytics into their operations with a data-first application development approach. Real-time adjustments to improve revenues, reduce costs, or mitigate risk rely on applications that minimize latency on a variety of data sources. In his session at @BigDataExpo, Jack Norris, Senior Vice President, Data and Applications at MapR Technologies, reviewed best practices to ...
An increasing number of companies are creating products that combine data with analytical capabilities. Running interactive queries on Big Data requires complex architectures to store and query data effectively, typically involving data streams, an choosing efficient file format/database and multiple independent systems that are tied together through custom-engineered pipelines. In his session at @BigDataExpo at @ThingsExpo, Tomer Levi, a senior software engineer at Intel’s Advanced Analytics gr...
When talking IoT we often focus on the devices, the sensors, the hardware itself. The new smart appliances, the new smart or self-driving cars (which are amalgamations of many ‘things’). When we are looking at the world of IoT, we should take a step back, look at the big picture. What value are these devices providing? IoT is not about the devices, it’s about the data consumed and generated. The devices are tools, mechanisms, conduits. In his session at Internet of Things at Cloud Expo | DXWor...