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  Think Big – Now Think Even Bigger
  Join Us at Internet of Things at Cloud Expo, November 11-13,
at the Javits Center!


The Internet of Things (IoT) is the most profound change in personal and enterprise IT since the creation of the Worldwide Web more than 20 years ago.

All major researchers estimate there will be tens of billions devices - computers, smartphones, tablets, and sensors - connected to the Internet by 2020. This number will continue to grow at a rapid pace for the next several decades.

With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend Internet of Things at Cloud Expo in New York City. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be!

Delegates to Internet of Things at Cloud Expo will be able to attend eight separate, information-packed tracks:

  • Enterprise Cloud
  • Digital Transformation
  • The API Enterprise | Mobility & Security
  • DevOps | Containers & Microservices
  • Cognitive Computing | AI, ML, DL
  • Big Data | Analytics
  • IoT | IIoT | Smart Cities
  • Hot Topics | FinTech | WebRTC

There are 120 breakout sessions in all, with Keynotes, General Sessions, and Power Panels adding to three days of incredibly rich presentations and content.


We'll see you in New York!



Day 3 Keynote at @ThingsExpo | Chris Matthieu, CTO of Octoblu
In his keynote at @ThingsExpo, Chris Matthieu, Director of IoT Engineering at Citrix and co-founder and CTO of Octoblu, focused on building an IoT platform and company. He provided a behind-the-scenes look at Octoblu's platform, business, and pivots along the way (including the Citrix acquisition of Octoblu).
  Themes & Topics to Be Discussed

Consumer IoT
• Wearables
• Smart Appliances
• Smart Cars
• Smartphones 2.0
• Automation
• Smart Travel
• Personal Fitness
• Health Care
• Personalized Marketing
• Customized Shopping
• Personal Finance
• The Digital Divide
• Mobile Cash & Markets
• Games & The IoT
• The Future of Education
• Virtual Reality

Enterprise IoT
• The Business Case for
x IoT
• Smart Grids
• Smart Cities
• Smart Transportation
• The Smart Home
• M2M
• Authentication/Security
• Wiring the IoT
• The Internet of
x Everything
• Digital Transformation
x of Enterprise IT
• Agriculture
• Transportation
• Manufacturing
• Local & State
x Government
• Federal Government

IoT Developers | WebRTC Summit
• Eclipse Foundation
• Cloud Foundry
• Linux Containers
• Node-Red
• Open Source Hardware
• Ajax and the IoT
• Leveraging SOA
• Multi-Cloud IoT
• Evolving Standards
• WebSockets
• Security & Privacy
x Protocols
• GPS & Proximity
x Services
• Bluetooth/RFID/etc
• XMPP
• Nest Labs



The Top Keynotes, the Best Sessions, a Rock Star Faculty and the Most Qualified Delegates of ANY Internet of Things Event!


The future of computing lies in these things. As computing takes a much more active role in our lives it will at the same time become much more invisible. Internet of Things Expo will address the challenges in getting from where we are today to this future.
 
The high-energy event is a must-attend for senior technologists from CEOs on down – including CIOs, CTOs, directors of infrastructure, VPs of technology, IT directors and managers, network and storage managers, network engineers, enterprise architects, and communications and networking specialists.




@ThingsExpo Power Panel | The World's Many IoTs: Which Are the Most Important?
The Internet of Things is clearly many things: data collection and analytics, wearables, Smart Grids and Smart Cities, the Industrial Internet, and more. Cool platforms like Arduino, Raspberry Pi, Intel's Galileo and Edison, and a diverse world of sensors are making the IoT a great toy box for developers in all these areas. In this Power Panel at @ThingsExpo, panelists discussed what things are the most important, which will have the most profound effect on the world, and what should we expect to see over the next couple of years.
Benefits of Attending the Three-Day Technical Program
  LEARNexactly why Internet of Things is relevant today from an economic, business and technology standpoint.
  HEAR first-hand from industry experts the common issues and requirements for creating a platform for the Internet of Things.
  SEE what new tools and approaches the Internet of Things requires.
  DISCOVER how to drive a distributed approach to the Internet of Things, where applications move to the data.
  FIND OUThow the vast volumes of new data produced by the Internet of Things provides a valuable new source of business insight through advanced analytical techniques.
  MASTER how the ongoing development of smart cities, cars, and houses will enhance connectivity infrastructure.
Lunch Power Panel | Microservices & IoT- Moderated by Jason Bloomberg
In this Power Panel at @DevOpsSummit, moderated by Jason Bloomberg, president of Intellyx, panelists Roberto Medrano, Executive Vice President at Akana; Lori MacVittie, Evangelist for F5 Networks; and Troy Topnik, ActiveState's Technical Product Manager; and Otis Gospodnetic, founder of Sematext; peeled away the buzz and discuss the important architectural principles behind implementing IoT solutions for the enterprise. As remote IoT devices and sensors become increasingly intelligent, they become part of our distributed cloud environment, and we must architect and code accordingly. At the very least, you'll have no problem filling in your buzzword bingo cards.


Using ColdFusion Components Part 1
Using ColdFusion Components Part 1

In the May issue of CFDJ (Vol. 4, issue 5) I introduced you to ColdFusion MX - the just-released ColdFusion upgrade that is nothing short of revolutionary. As I explained in that article, CFMX features lots of incredible new technologies and features. But the one I think is most important (in terms of how it will, or should, impact your development) has to be ColdFusion Components. This month (and continued next month) I'd like to explain in depth what CFCs are and how they should be used.

CFCs Are Objects, Kind Of
To understand CFCs it's important to understand a bit about objects.

But first, a necessary qualification - CFML is not an object-oriented language, and CFCs don't provide all the features and functionality typically provided by OOP languages. This isn't a bad thing - actually, I think the opposite is true. Objects have too long been the exclusive property of languages and syntactical rules that are unnecessarily complicated. There's no reason for developers using rapid development languages, like CFML, not to be able to leverage this type of technology too. Thus the CFC.

At their simplest, and at the risk of offending OOP purists, objects are simply reusable application bits. They are black boxes - magical things that do stuff, whatever you define that stuff to be. If this sounds a bit like custom tags, well, there are similarities, but objects typically do more than custom tags. For example, they often contain not just code (like custom tags) but also data, allowing data and any code that accesses it to be cleanly encapsulated. Objects usually have multiple entry points (methods). They provide a mechanism to automatically run initialization code regardless of the entry point (a constructor). Objects can be adapted and modified, leveraging existing code without actually modifying (and potentially breaking) any of it in the process (inheritance).

If this all sounds a little esoteric, an example should help clarify things.

Objects Demystified
Almost any ColdFusion developer has had to deal with users in their applications. You've probably done things like:

  • Used <CFQUERY> to check a user-provided name and password
  • Used returned database rows to obtain a user's name and e-mail address
  • Used programmatic flow-control to grant or deny access to features based on login name, access level, or security equivalences
  • Saved and read user preferences like colors, fonts, language choices, topic and category selections, and more
  • Added new users or updated or deleted existing ones
  • ...and so on
In doing these things, how many places in your code ended up referring to users in some way, shape, or form? How much code did you end up repeating (or copying and pasting)? What would happen if the user tables had to change, and how much code would that affect? What if your databases were replaced entirely by an LDAP server, or new sets of rules and levels had to be applied? How much did nonprogrammers have to know about the guts of your user management to be able to do simple things like display a personalized welcome message?

In an object world you'd have written your application very differently. You'd have created a user object - a black box that contained everything and anything you'd ever need to do with users, as well as all the database (or LDAP) access needed to perform those operations.

To perform operations on a user, you'd then create an instance of the user object, perhaps specifying the user ID in the process. Then you'd be able to use methods (functions) like:

  • Add()
  • Delete()
  • Update()
  • Get()
Or even more specific ones, like:
  • VerifyPassword()
  • GetEMail()
  • GetColorPrefs()
  • GetDisplayName()
...the idea being that any and all user processing would happen inside the user object. You'd never access user tables directly. Actually, you wouldn't even know (or care) that the data is being stored in a table - that wouldn't matter at all. You'd just invoke methods as needed, letting the code inside the object do its thing.

This is the kind of functionality made possible using CFCs.

Introducing CFCs
Now that you know what CFCs are, let's look at how they're created. True to ColdFusion and its mission, CFCs are incredibly easy to create. In fact, only two steps are involved:

1.   Create a file with a .CFC extension (this distinguishes CFCs from ColdFusion templates, which have a .CFM extension).
2.   Use four new tags to create the components, define their functions and arguments, and return a value.

The four new tags are:

  • <CFCOMPONENT>: Defines a CFC
  • <CFFUNCTION>: Defines the functions (methods) within a CFC
  • <CFARGUMENT>: Defines the arguments (parameters) that a function accepts
  • <CFRETURN>: Returns a value or result from a function
Other than these new tags (which, incidentally, are the same ones used to create tag-based, user-defined functions in CFMX), CFCs are plain CFML. Within a CFC you can use any tag, function, custom tag, component, and more.

Creating CFCs
Listing 1 offers a simple example to clarify all this, a component that does basic browser identification (determines the browser being used).

This is a simplified version of a file named browser.cfc. As you can see, the code is wrapped between <CFCOMPONENT> and </CFCOMPONENT> tags. The component itself has a single function, IsIE (as in "Is Internet Explorer"), and is defined and named with a <CFFUNCTION> tag. Within the function a variable named result is defined and initialized; if the browser identifier contains the Microsoft Internet Explorer identifier, that variable is then set to "yes." And finally, <CFRETURN> returns "result."

This isn't a complete example yet (although it's actually workable as is), but it's a good starting point.

How would you use this code? Save it as browser.cfc, and in the same directory create a test.cfm file that should contain the following:

<!--- Invoke browser CFC --->
<CFINVOKE COMPONENT="browser"
METHOD="IsIE"
RETURNVARIABLE="result_ie">

<!--- Feedback --->
<CFOUTPUT>
Your browser is:<BR>
IE: #YesNoFormat(result_ie)#<BR>
</CFOUTPUT>

<CFINVOKE> is a new tag in CFMX and one of its jobs is to invoke component methods. As seen here, <CFINVOKE> takes the name of the component (browser, minus the extension) and the method to execute. To access any returned data, the RETURNVARIABLE attribute provides the name of a variable to contain whatever the function returns.

You can try running this code. If you are running IE it will tell you so, and if not it'll tell you that too.

Writing Complete CFCs
Now that you're familiar with how CFCs work, take a look at Listing 2, a complete version of browser.cfc. This new version is a bit more complex, so let's walk through it together.

<CFCOMPONENTS> now contains four methods:

  • IsIE: Checks for IE, returning "yes" or "no"
  • IsNetscape: Checks for Netscape, returning "yes" or "no"
  • IsDreamweaver: Checks for Dreamweaver (the browser built into Dreamweaver), returning "yes" or "no"
  • Identify: Checks for all three, returning "IE" if Internet Explorer, "NS" if Netscape, "DW" if Dreamweaver, and an empty string if unknown (none of the above)
You'll notice that we've added two attri-butes to every <CFFUNCTION>:
  • RETURNTYPE: Specifies the type of the return data. This is used to validate returned data (if it's the wrong type, an error would be thrown) and to document the function.
  • HINT: A text description used when the function is documented (more on that in a moment)
In the earlier version of browser.cfc the code checked the CGI variable HTTP_ USER_ AGENT to determine the browser used. But that's not ideal because these functions should be able to check any browser ID passed to them (assuming they're not always checking the current browser).

And so, each of these new functions takes an optional parameter defined with the <CFARGUMENT> tag, which can be used in two distinct ways:

1.   To check for required parameters, set REQUIRED="yes"; if the specified parame-ter isn't passed, an error will be thrown. Additional validation may be performed by specifying a TYPE, in which case ColdFusion checks that the parameter exists and that it is of the correct type.
2.   To check for optional parameters, set REQUIRED="no" and specify the DE-FAULT value to be used if the parameter isn't provided.

In all four functions <CFARGUMENT> defines a single parameter, browser, allowing calling code to pass any string as needed. If the parameter isn't provided, the default CGI variable is used as before.

The first three functions are basically the same as the one we looked at earlier, but the fourth, identify, which provides an alternate interface to the browser identification code, warrants special mention. Instead of checking for a specific browser (as the three prior functions do), this one checks for them all and returns an ID based on which browser it is. Rather than copy all of the previous code into this new function, it simply invokes those functions directly. But it doesn't invoke them using the <CFINVOKE> tag seen previously; rather, it uses them as functions (which they are), making the syntax much cleaner and simpler.

Listing 3, a revised version of test.cfm, can be used to test all the functions.

It's as simple as that.

Documentation
I mentioned that HINT and RETURNTYPE are used in documenting CFCs. So where is the documentation?

CFCs may be introspected - a fancy way of saying that they can be asked to describe themselves. As they know all about their functions and what they do, they can fulfill this request quite admirably.

Here are two ways to introspect a CFC:

1.   Execute a CFC directly in your browser, providing a URL directly to it (something like http:// local-host/path/browser.cfc). ColdFusion will generate cleanly formatted documentation on-the-fly, using everything it knows about the component (including the specified HINTs).
2.   If you're using Dreamweaver MX, select the Components tab in the application window to have Dreamweaver scan for available CFCs. Dreamweaver will then build a tree control containing all components and their methods. You may right-click on any component or method for more information (or to edit the code), and may even drag a method into the editor window to generate a complete <CFINVOKE> tag.

There's more to introspection, but we're out of space for now.

Summary
CFCs provide the power of objects with the simplicity of CFML. As seen here, CFCs are created using four new tags, saved as .CFC files, and invoked using the <CFINVOKE> tag. But we've barely scratched the surface here. In fact, thus far we've been using CFCs merely as glorified custom tags. Next month I'll show you alternate ways to invoke CFCs, how to make them persist, how to use constructors and inheritance, and much more. And we'll come back to the user explanation we started with.

About Ben Forta
Ben Forta is Adobe's Senior Technical Evangelist. In that capacity he spends a considerable amount of time talking and writing about Adobe products (with an emphasis on ColdFusion and Flex), and providing feedback to help shape the future direction of the products. By the way, if you are not yet a ColdFusion user, you should be. It is an incredible product, and is truly deserving of all the praise it has been receiving. In a prior life he was a ColdFusion customer (he wrote one of the first large high visibility web sites using the product) and was so impressed he ended up working for the company that created it (Allaire). Ben is also the author of books on ColdFusion, SQL, Windows 2000, JSP, WAP, Regular Expressions, and more. Before joining Adobe (well, Allaire actually, and then Macromedia and Allaire merged, and then Adobe bought Macromedia) he helped found a company called Car.com which provides automotive services (buy a car, sell a car, etc) over the Web. Car.com (including Stoneage) is one of the largest automotive web sites out there, was written entirely in ColdFusion, and is now owned by Auto-By-Tel.

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Reader Feedback: Page 1 of 1

Er, make that GREY background...

Where you post your reply at the bottom of the article, if you look to the right then you'll see the 'source code' link on the blue background.

When reviewing an article online,
if the author refers to code as in listing 1, what link or area would I go to to review the code that is being described?


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Testimonials
This week I had the pleasure of delivering the opening keynote at Cloud Expo New York. It was amazing to be back in the great city of New York with thousands of cloud enthusiasts eager to learn about the next step on their journey to embracing a cloud-first worldl."
@SteveMar_Msft
 
How does Cloud Expo do it every year? Another INCREDIBLE show - our heads are spinning - so fun and informative."
@SOASoftwareInc
 
Thank you @ThingsExpo for such a great event. All of the people we met over the past three days makes us confident IoT has a bright future."
@Cnnct2me
 
One of the best conferences we have attended in a while. Great job, Cloud Expo team! Keep it going."

@Flexential


Who Should Attend?
Senior Technologists including CIOs, CTOs & Vps of Technology, Chief Systems Engineers, IT Directors and Managers, Network and Storage Managers, Enterprise Architects, Communications and Networking Specialists, Directors of Infrastructure.

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SYS-CON Media has a flourishing Media Partner program in which mutually beneficial promotion and benefits are arranged between our own leading Enterprise IT portals and events and those of our partners.

If you would like to participate, please provide us with details of your website/s and event/s or your organization and please include basic audience demographics as well as relevant metrics such as ave. page views per month.

To get involved, email events@sys-con.com.

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