Welcome!

Java IoT Authors: Elizabeth White, Yeshim Deniz, Scott Allen, Roger Strukhoff, Pat Romanski

Related Topics: Adobe Flex, Java IoT, IoT User Interface

Adobe Flex: Article

Three Tips to Successfully Load Test Adobe Flex Applications

It has become increasingly important to performance test these web applications under different loads

The world has changed dramatically for organizations that use web-enabled business applications in enterprise environments. The complexities of modern applications, which include multi-tiered, globally distributed architectures, SOA and a host of other new technologies, have forced major change in the way enterprises develop, test and manage web-enabled applications. Specifically, Rich Internet Application (RIA) technologies such as Adobe Flex allow a faster, more engaging, interactive experience with browser- enabled applications and services. While an attractive option for developing expanded application capabilities these RIA technologies bring new challenges to organizations that need to deploy application features and functions in a compressed time frame and at a lower cost.

Preparing for the shift as part of this new technology trend, companies must adapt their testing approach as well. Given the way new technologies work when deployed on Onternet/intranet applications, it's important to be careful in approaching the testing of Flex applications. When rolling out next-generation applications on a mission-critical enterprise application platform, you need to be confident that your systems will perform. As load testing is one of the last crucial tasks before launching a web application, it's usually done under pressure and with tight time constraints. Before we discuss tips to make you successful when load testing Adobe Flex applications, first let's look at how Adobe Flex applications are unique.

Adobe Flex applications may be different from applications you've worked with before. For classic HTML web applications, the server does all of the processing. In addition, the rendering of HTML requires full page refreshes. Flex applications are different because content is delivered without having to reload the page. These applications download the Flash client application and run in the browser, or for Adobe AIR applications, on the desktop. The Flash is constantly being updated by the server, asynchronously. For this reason, Adobe Flex server loads reveal a very different profile.

We all know it is important to measure transaction response times when performance testing web appli­cations. But Flex technology can cause significant increases in the number of browser-to-server HTTP calls made in the background and this increase in traffic can have a profound effect on per­formance. While users might not be aware of the round-trips between the browser and a distant server, they will definitely notice performance a problem if the application is slow or doesn't work because of the increased load. Knowing the scalability limitations of your deployments is crucial.

Innovative RIA technologies like Flex present new challenges with respect to emulating a realistic load. If you're developing or deploying applications in this newer technology, successfully addressing these challenges requires thinking about load testing in new ways. Let's look at the new challenges in load testing Flex applications and three tips to improve application performance and enrich the user experience.

Tip 1: Make sure you can decode AMF and process internal identifiers
Adobe's Flex AMF (Action Messaging Format) protocol is used to exchange data between an Adobe Flash application and a database, using a Remote Procedure call. Since the data is in compressed binary format, communication is faster and more efficient than a web service. Older load testing solutions claim they can handle "Flex" technology, but have difficulty doing so in the real world. Many load testing tools rely on data being sent over HTTP and don't tap into the AMF protocol. Therefore, they don't go deep enough to understand what is being exchanged between client and server. For optimum testing, make sure your load testing tool decodes these objects so that you can parameterize the requests, extract data from the response and validate the response. Users should look for automated variable extraction and parameterization, automated comparison features to show changes from one code base to the next and automated documentation of results so test output is immediately actionable by all stakeholders.

In addition, AMF message protocol uses internal identifiers (clientId, DSId, etc.) to maintain the AMF session. Parameters in an AMF session are dynamically generated and are numerous. To avoid painful manual configuration of these parameters, make sure that your load testing tool automatically processes serialized objects and identifiers.

Tip 2: Make sure you can support customized external messages
AMF3 compact binary format helps integrate binary data exchange into all server platforms. The protocol improves the quality of all remote and messaging solutions for Flex and optimizes data exchange. AMF3 reduces the quantity of exchanged information and avoids redundant messages. In particular, AMF3 externalizable messages allow developers to customize the serialization of objects exchanged in AMF.

When selecting a load testing tool, make sure it allows you to integrate custom code into it. For optimum testing, the customized code should be loaded and run by the testing tool to correctly replay custom messages.

Tip 3: Make sure you can support polling and streaming
Many Flex applications require that some data are regularly pushed from the server to the client. Servers using AMF protocol update client data in two ways:

  • The polling method: This is when the browser queries the server at regular intervals. Technically simple in its implementation, the method's downside is that it needlessly overloads the server and is not very reactive. When these applications are recorded with a load testing tool, a high number of browsers to server requests are recorded along with other more significant requests. It's important to make sure your tool can automatically simplify your recording to get a clear maintainable script.
  • The streaming method: In this case, the client sends a single request to the server and the server responds when pertinent information is available, without closing the request. The server can send information to the client again using the same connection, without having to wait for a new request. Using this method, client data can be rapidly updated while network traffic is kept to a minimum. The testing tool must be able to keep the stream open when it plays a streaming request. This request will block the connection so the tool has to use a second connection for classic requests.

In both cases, typical HTTP response times are not useful. For regular HTTP requests, load testing tools measure the time between when the request is sent and when the response is received. It's important that your load testing tool can measure what's really interesting: the time between when the server updates the client and when the client receives the update. Not only should the tool measure this information but this function should be automated so that testing can be done frequently and earlier in the lifecycle.

As more and more companies deploy mission-critical applications on the Internet, it has become increasingly important to performance test these web applications under different loads before they go live. While Adobe Flex provides expanded capabilities to develop new powerful applications in support of organizational needs, the technology is different from other applications. As a result a new approach to load testing is required. To understand how your applications will work in the Adobe Flex production environment, and to optimize them for higher performance, you need be able to simulate not just the actions of one user, but the actions of many users. By implementing the tips in this article, companies can quickly adapt their testing methodology to handle Flex applications, get to market faster and easier than ever before, while improving productivity and saving money.

More Stories By Christophe Marton

Christophe Marton is co-founder of Neotys and co-creator of the development tool NeoLoad. Previously, he worked at Calendra where he developed his expertise in the performance and load testing space, for which he ultimately developed a unique vision for a next generation solution. While at Calendra, he developed software solutions for the identity management market which was later acquired by BMC software in 2005. During his six year tenure at Calendra, he developed the skills required to create, develop and take cutting edge software to market. Marton is a Computer Engineering graduate of ESIL Marseille Engineering School.

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
Just over a week ago I received a long and loud sustained applause for a presentation I delivered at this year’s Cloud Expo in Santa Clara. I was extremely pleased with the turnout and had some very good conversations with many of the attendees. Over the next few days I had many more meaningful conversations and was not only happy with the results but also learned a few new things. Here is everything I learned in those three days distilled into three short points.
"My role is working with customers, helping them go through this digital transformation. I spend a lot of time talking to banks, big industries, manufacturers working through how they are integrating and transforming their IT platforms and moving them forward," explained William Morrish, General Manager Product Sales at Interoute, in this SYS-CON.tv interview at 18th Cloud Expo, held June 7-9, 2016, at the Javits Center in New York City, NY.
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, wh...
Adobe is changing the world though digital experiences. Adobe helps customers develop and deliver high-impact experiences that differentiate brands, build loyalty, and drive revenue across every screen, including smartphones, computers, tablets and TVs. Adobe content solutions are used daily by millions of companies worldwide-from publishers and broadcasters, to enterprises, marketing agencies and household-name brands. Building on its established design leadership, Adobe enables customers not o...
Why do your mobile transformations need to happen today? Mobile is the strategy that enterprise transformation centers on to drive customer engagement. In his general session at @ThingsExpo, Roger Woods, Director, Mobile Product & Strategy – Adobe Marketing Cloud, covered key IoT and mobile trends that are forcing mobile transformation, key components of a solid mobile strategy and explored how brands are effectively driving mobile change throughout the enterprise.
In this strange new world where more and more power is drawn from business technology, companies are effectively straddling two paths on the road to innovation and transformation into digital enterprises. The first path is the heritage trail – with “legacy” technology forming the background. Here, extant technologies are transformed by core IT teams to provide more API-driven approaches. Legacy systems can restrict companies that are transitioning into digital enterprises. To truly become a lea...
What are the new priorities for the connected business? First: businesses need to think differently about the types of connections they will need to make – these span well beyond the traditional app to app into more modern forms of integration including SaaS integrations, mobile integrations, APIs, device integration and Big Data integration. It’s important these are unified together vs. doing them all piecemeal. Second, these types of connections need to be simple to design, adapt and configure...
What happens when the different parts of a vehicle become smarter than the vehicle itself? As we move toward the era of smart everything, hundreds of entities in a vehicle that communicate with each other, the vehicle and external systems create a need for identity orchestration so that all entities work as a conglomerate. Much like an orchestra without a conductor, without the ability to secure, control, and connect the link between a vehicle’s head unit, devices, and systems and to manage the ...
24Notion is full-service global creative digital marketing, technology and lifestyle agency that combines strategic ideas with customized tactical execution. With a broad understand of the art of traditional marketing, new media, communications and social influence, 24Notion uniquely understands how to connect your brand strategy with the right consumer. 24Notion ranked #12 on Corporate Social Responsibility - Book of List.
The Jevons Paradox suggests that when technological advances increase efficiency of a resource, it results in an overall increase in consumption. Writing on the increased use of coal as a result of technological improvements, 19th-century economist William Stanley Jevons found that these improvements led to the development of new ways to utilize coal. In his session at 19th Cloud Expo, Mark Thiele, Chief Strategy Officer for Apcera, will compare the Jevons Paradox to modern-day enterprise IT, e...
Major trends and emerging technologies – from virtual reality and IoT, to Big Data and algorithms – are helping organizations innovate in the digital era. However, to create real business value, IT must think beyond the ‘what’ of digital transformation to the ‘how’ to harness emerging trends, innovation and disruption. Architecture is the key that underpins and ties all these efforts together. In the digital age, it’s important to invest in architecture, extend the enterprise footprint to the cl...
SYS-CON Events announced today that Commvault, a global leader in enterprise data protection and information management, has been named “Bronze Sponsor” of SYS-CON's 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Commvault is a leading provider of data protection and information management solutions, helping companies worldwide activate their data to drive more value and business insight and to transform moder...
SYS-CON Events has announced today that Roger Strukhoff has been named conference chair of Cloud Expo and @ThingsExpo 2016 Silicon Valley. The 19th Cloud Expo and 6th @ThingsExpo will take place on November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. "The Internet of Things brings trillions of dollars of opportunity to developers and enterprise IT, no matter how you measure it," stated Roger Strukhoff. "More importantly, it leverages the power of devices and the Interne...
What does it look like when you have access to cloud infrastructure and platform under the same roof? Let’s talk about the different layers of Technology as a Service: who cares, what runs where, and how does it all fit together. In his session at 18th Cloud Expo, Phil Jackson, Lead Technology Evangelist at SoftLayer, an IBM company, spoke about the picture being painted by IBM Cloud and how the tools being crafted can help fill the gaps in your IT infrastructure.
Digital innovation is the next big wave of business transformation based on digital technologies of which IoT and Big Data are key components, For example: Business boundary innovation is a challenge to excavate third-party business value using IoT and BigData, like Nest Business structure innovation may propose re-building business structure from scratch, as Uber does in the taxicab industry The social model innovation is also a big challenge to the new social architecture with the design fr...
Data is an unusual currency; it is not restricted by the same transactional limitations as money or people. In fact, the more that you leverage your data across multiple business use cases, the more valuable it becomes to the organization. And the same can be said about the organization’s analytics. In his session at 19th Cloud Expo, Bill Schmarzo, CTO for the Big Data Practice at EMC, will introduce a methodology for capturing, enriching and sharing data (and analytics) across the organizati...
DevOps at Cloud Expo, taking place Nov 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 19th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long dev...
IoT offers a value of almost $4 trillion to the manufacturing industry through platforms that can improve margins, optimize operations & drive high performance work teams. By using IoT technologies as a foundation, manufacturing customers are integrating worker safety with manufacturing systems, driving deep collaboration and utilizing analytics to exponentially increased per-unit margins. However, as Benoit Lheureux, the VP for Research at Gartner points out, “IoT project implementers often ...
SYS-CON Events announced today that Bsquare has been named “Silver Sponsor” of SYS-CON's @ThingsExpo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. For more than two decades, Bsquare has helped its customers extract business value from a broad array of physical assets by making them intelligent, connecting them, and using the data they generate to optimize business processes.
Businesses are struggling to manage the information flow and interactions between all of these new devices and things jumping on their network, and the apps and IT systems they control. The data businesses gather is only helpful if they can do something with it. In his session at @ThingsExpo, Chris Witeck, Principal Technology Strategist at Citrix, will discuss how different the impact of IoT will be for large businesses, expanding how IoT will allow large organizations to make their legacy ap...