|By Michael Zuskin||
|November 26, 2012 07:45 AM EST||
Give all entities mentioned in the code (DB tables, DB tables' fields, variables, classes, functions, etc.) meaningful, descriptive names that make the code easily understood. The names should be so self-explanatory that it eliminates the need for comments in most cases.
Use the words per and by as often as possible - they really simplify a developer's life. A variable's name li_cows_per_farm is better than li_total_cows, and a function name uf_retrieve_city_by_country tells us more than uf_retrieve_city, especially if it doesn't have parameters that supply the "by what" information.
Don't use abstract words like "actual" and "total' in variables names as they will madden you, forcing to spend extra time trying to understand what is "actual," what is "not actual" and which grouping level is "total" for. Is li_total_cows field total per barn? per farm? per village? per province? per country? per the Universe? If, for example, per farm, then how will you name the total per village? It's also "total"! So, don't write simply "total" - write total PER WHAT! Use only exact definitions that produce no (or minimum) questions, even if that results in longer variables names.
*** BAD code: ***
ldc_total_salary = ldc_actual_salary * ldc_total_hours
*** GOOD code: ***
ldc_salary_per_day = ldc_salary_per_hour * ldc_hours_per_day
Don't produce different versions of a same entity name (like emp_id / employee_id, inv_num / invoice_num).
When you use values retrieved from database tables, try to name the corresponding variables exactly by the DB fields (of course, adding naming convention prefixes where needed). But you can use local variables' names more freely, especially when the coded logic is complicated while the tables fields are not informative enough (see the previous rule).
Long, Descriptive Names
The common, obvious practice is to give variables and functions short names. But, sometimes, there are situations when it makes sense to break that rule and use long, "real-English" names that will clearly describe what they are for.
For example, it can be done when a variable is in a rare use (like an instance var, which is referenced only a couple of times), but not a local var which is mentioned in the code many times. Anyway, don't be afraid to give long names any time you feel it will simplify working with the code. See the difference between:
is_main_filter = uf_get_main_filter()
is_filter_by_selected_row_in_summary_win = uf_get_filter_by_selected_row_in_summary_win()
As you can see, names of variables can tell the whole story. Even if it makes a line too long, there is no problem breaking it into two lines - it's better than looking at a variable and having no idea what is stored in it (or to search its declaration in hopes that a clarifying comment exists). But remember - names of that style should be an exception, not a rule.
Exact Action Timing
Names describing actions must express if the action should be done in the future or was done in the past.
Giving names to variables, don't force readers to guess an action timing. A good example of a bad variable name is lb_is_calculation. How must the condition "if lb_is_calculation then..." be understood? As you can see, there is no problem exists understanding what it means if the variable is named lb_is_calculation_done (lb_is_calculated) or in the imperative form - lb_do_calculation (or simply lb_calculate).
The common advice is to use words do..., ...to_do, perform..., execute..., ...to_apply, etc., for stuff that should take place in the future, and ...done, ...performed, ...executed, ...occurred, ...passed, ...applied, etc., for things that have taken place in the past.
Constants for [Meaningless] Application Codes
Don't hard code numbers if they are not apparent - use constants instead.
Okay, it's still possible to understand what "if li_inv_year > 2011..." or "if li_month = 4..." is but what do you want to say to a programmer who has written "if li_window_mode = 3..." or "if li_inv_status = 8..."?
Local and Instance Constants Management
Giving names to local and instance constants, divide the family prefix from the mnemonic description by two underscores.
Now let's discuss local and instance-scope constants. Their names must consist of two parts:
- Group (or "family") - like "ORDER_STATUS" or "INVOICE_STATUS". A few constants of the same family can co-exist in the scope (for example, an order can have many statuses). In fact, it's a prefix before the main descriptive part.
- Description (or mnemonic part) - like "OPEN" or "CLOSED". There can be many constants with the same description (for example, both - an order and an invoice - can have the status "OPEN").
Using two underscores (instead of one) to connect both parts will allow code readers to easily distinguish between them, especially when each part consists of a number of words. For example:
constant string ORDER_STATUS__OPEN = "OPN"
constant string ORDER_STATUS__CLOSED = "CLS"
constant string ORDER_STATUS__CANCELED = "CNCL"
constant string INV_STATUS__OPEN = "OPN"
constant string INV_STATUS__CLOSED = "CLS"
constant string INV_STATUS__CANCELED = "CNCL"
Global Constants Management
Constants, used globally (in different parts of the application), must be declared in not-autoinstantiated NVOs - one NVO per each constants group (or "family") - and accessed via the automatically created global reference variable with the same name, without declaring additional variables and creating instances.
For example, you can have an NVO named n_color for color constants, n_order_status for order statuses constants, etc. It's a good idea to keep them all in one PBL so developers can easily check if the NVO for the group they need already exists or must be created. The constants are declared in the instance variables declaration section in a very straightforward way. Here is a possible set for n_order_status:
constant string OPEN = "OPN"
constant string CLOSED = "CLS"
constant string CANCELED = "CNCL"
If you open any not-autoinstantiated class in the "View Source" mode, you can see that PowerBuilder automatically creates a global variable of that object's type with the same name as the class (PB doesn't know that we add "g" to global vars! :-D ). For example, if you create n_order_status class (not-autoinstantiated, remember?) and look at its source, you'll see the following line:
global n_order_status n_order_status
That's exactly the mentioned declaration of the global var. You don't need to declare a variable of the object each time you need to use a constant in your script - you already have a variable ready for use. That's how you mention a constant in the code:
Looking pretty similar to enum of C# but, unfortunately, it's not an enumerated type; you cannot declare a function argument of type n_order_status and pass to that function one of the statuses (which is of type string) defined in the type - you can only pass a reference to n_order_status object, which doesn't solve the problem of passing type-safe arguments. You can make the argument of type string to pass a particular status, but this approach doesn't supply type safety - nothing prevents you from passing an invoice status or even the name of your cat...
Pay attention that PowerBuilder only declares a global variable; it doesn't create an object referenced by that variable. Practically it means that we can use only constants because they belong to a type (not an instance) definition (something similar to static data in C#). If you try to access an instance variable or a function of that global var, then you will get the "Null object reference" error. As opposed to C#, which will happen even if the function doesn't access instance data, so there is nothing like C#'s "static function" behavior in PowerBuilder.
For standalone constants (not belonging to any family) create one common NVO named, let's say, n_const.
While not quite mainstream yet, WebRTC is starting to gain ground with Carriers, Enterprises and Independent Software Vendors (ISV’s) alike. WebRTC makes it easy for developers to add audio and video communications into their applications by using Web browsers as their platform. But like any market, every customer engagement has unique requirements, as well as constraints. And of course, one size does not fit all. In her session at WebRTC Summit, Dr. Natasha Tamaskar, Vice President, Head of Cloud and Mobile Strategy at GENBAND, will explore what is needed to take a real time communications ...
Apr. 27, 2015 12:00 PM EDT Reads: 1,801
Chuck Piluso will present a study of cloud adoption trends and the power and flexibility of IBM Power and Pureflex cloud solutions. Speaker Bio: Prior to Data Storage Corporation (DSC), Mr. Piluso founded North American Telecommunication Corporation, a facilities-based Competitive Local Exchange Carrier licensed by the Public Service Commission in 10 states, serving as the company's chairman and president from 1997 to 2000. Between 1990 and 1997, Mr. Piluso served as chairman & founder of International Telecommunications Corporation, a facilities-based international carrier licensed by t...
Apr. 27, 2015 12:00 PM EDT
There are lots of challenges in IoT around secure, scalable and business friendly infrastructure for enterprises. For large corporations, IoT implementations are one of the top priorities of the decade. All industries are seeing a competitive need to sustain by investing in IoT initiatives. The value addition comes from improved customer service, innovative product and additional revenue streams. The data from these IP-connected devices can be leveraged for a variety of business applications as well as responsive action controls. The various architectural building blocks of an IoT ...
Apr. 27, 2015 12:00 PM EDT
The IoT Bootcamp is coming to Cloud Expo | @ThingsExpo on June 9-10 at the Javits Center in New York. Instructor. Registration is now available at http://iotbootcamp.sys-con.com/ Instructor Janakiram MSV previously taught the famously successful Multi-Cloud Bootcamp at Cloud Expo | @ThingsExpo in November in Santa Clara. Now he is expanding the focus to Janakiram is the founder and CTO of Get Cloud Ready Consulting, a niche Cloud Migration and Cloud Operations firm that recently got acquired by Aditi Technologies. He is a Microsoft Regional Director for Hyderabad, India, and one of the f...
Apr. 27, 2015 12:00 PM EDT Reads: 1,678
The 17th International Cloud Expo has announced that its Call for Papers is open. 17th International Cloud Expo, to be held November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, brings together Cloud Computing, APM, APIs, Microservices, Security, Big Data, Internet of Things, DevOps and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportunity. Submit your speaking proposal today!
Apr. 27, 2015 12:00 PM EDT Reads: 2,329
In 2015, 4.9 billion connected "things" will be in use. By 2020, Gartner forecasts this amount to be 25 billion, a 410 percent increase in just five years. How will businesses handle this rapid growth of data? Hadoop will continue to improve its technology to meet business demands, by enabling businesses to access/analyze data in real time, when and where they need it. Cloudera's Chief Technologist, Eli Collins, will discuss how Big Data is keeping up with today's data demands and how in the future, data and analytics will be pervasive, embedded into every workflow, application and infra...
Apr. 27, 2015 11:00 AM EDT Reads: 1,478
From telemedicine to smart cars, digital homes and industrial monitoring, the explosive growth of IoT has created exciting new business opportunities for real time calls and messaging. In his session at @ThingsExpo, Ivelin Ivanov, CEO and Co-Founder of Telestax, shared some of the new revenue sources that IoT created for Restcomm – the open source telephony platform from Telestax. Ivelin Ivanov is a technology entrepreneur who founded Mobicents, an Open Source VoIP Platform, to help create, deploy, and manage applications integrating voice, video and data. He is the co-founder of TeleStax, a...
Apr. 27, 2015 11:00 AM EDT Reads: 5,181
As Marc Andreessen says software is eating the world. Everything is rapidly moving toward being software-defined – from our phones and cars through our washing machines to the datacenter. However, there are larger challenges when implementing software defined on a larger scale - when building software defined infrastructure. In his session at 16th Cloud Expo, Boyan Ivanov, CEO of StorPool, will provide some practical insights on what, how and why when implementing "software-defined" in the datacenter.
Apr. 27, 2015 11:00 AM EDT Reads: 1,633
How is unified communications transforming the way businesses operate? In his session at WebRTC Summit, Arvind Rangarajan, Director of Product Marketing at BroadSoft, will discuss how to extend unified communications experience outside the enterprise through WebRTC. He will also review use cases across different industry verticals. Arvind Rangarajan is Director, Product Marketing at BroadSoft. He has over 19 years of experience in the telecommunications industry in various roles such as Software Development, Product Management and Product Marketing, applied across Wireless, Unified Communic...
Apr. 27, 2015 11:00 AM EDT Reads: 1,729
SYS-CON Events announced today that MangoApps will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY., and the 17th International Cloud Expo®, which will take place on November 3–5, 2015, at the Santa Clara Convention Center in Santa Clara, CA. MangoApps provides private all-in-one social intranets allowing workers to securely collaborate from anywhere in the world and from any device. Social, mobile, and easy to use. MangoApps has been named a "Market Leader" by Ovum Research and a "Cool Vendor" by Gartner...
Apr. 27, 2015 11:00 AM EDT Reads: 3,591
SYS-CON Media announced today that @ThingsExpo Blog launched with 7,788 original stories. @ThingsExpo Blog offers top articles, news stories, and blog posts from the world's well-known experts and guarantees better exposure for its authors than any other publication. @ThingsExpo Blog can be bookmarked. 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.
Apr. 27, 2015 11:00 AM EDT Reads: 2,573
The world's leading Cloud event, Cloud Expo has launched Microservices Journal on the SYS-CON.com portal, featuring over 19,000 original articles, news stories, features, and blog entries. DevOps Journal is focused on this critical enterprise IT topic in the world of cloud computing. Microservices Journal offers top articles, news stories, and blog posts from the world's well-known experts and guarantees better exposure for its authors than any other publication. Follow new article posts on Twitter at @MicroservicesE
Apr. 27, 2015 11:00 AM EDT Reads: 2,117
SYS-CON Events announced today that robomq.io will exhibit at SYS-CON's @ThingsExpo, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. robomq.io is an interoperable and composable platform that connects any device to any application. It helps systems integrators and the solution providers build new and innovative products and service for industries requiring monitoring or intelligence from devices and sensors.
Apr. 27, 2015 11:00 AM EDT Reads: 2,105
Containers and microservices have become topics of intense interest throughout the cloud developer and enterprise IT communities. Accordingly, attendees at the upcoming 16th Cloud Expo at the Javits Center in New York June 9-11 will find fresh new content in a new track called PaaS | Containers & Microservices Containers are not being considered for the first time by the cloud community, but a current era of re-consideration has pushed them to the top of the cloud agenda. With the launch of Docker's initial release in March of 2013, interest was revved up several notches. Then late last...
Apr. 27, 2015 11:00 AM EDT Reads: 2,892
Wearable technology was dominant at this year’s International Consumer Electronics Show (CES) , and MWC was no exception to this trend. New versions of favorites, such as the Samsung Gear (three new products were released: the Gear 2, the Gear 2 Neo and the Gear Fit), shared the limelight with new wearables like Pebble Time Steel (the new premium version of the company’s previously released smartwatch) and the LG Watch Urbane. The most dramatic difference at MWC was an emphasis on presenting wearables as fashion accessories and moving away from the original clunky technology associated with t...
Apr. 27, 2015 11:00 AM EDT Reads: 2,117
SYS-CON Events announced today that Litmus Automation will exhibit at SYS-CON's 16th International Cloud Expo®, which will take place on June 9-11, 2015, at the Javits Center in New York City, NY. Litmus Automation’s vision is to provide a solution for companies that are in a rush to embrace the disruptive Internet of Things technology and leverage it for real business challenges. Litmus Automation simplifies the complexity of connected devices applications with Loop, a secure and scalable cloud platform.
Apr. 27, 2015 11:00 AM EDT Reads: 1,758
So I guess we’ve officially entered a new era of lean and mean. I say this with the announcement of Ubuntu Snappy Core, “designed for lightweight cloud container hosts running Docker and for smart devices,” according to Canonical. “Snappy Ubuntu Core is the smallest Ubuntu available, designed for security and efficiency in devices or on the cloud.” This first version of Snappy Ubuntu Core features secure app containment and Docker 1.6 (1.5 in main release), is available on public clouds, and for ARM and x86 devices on several IoT boards. It’s a Trend! This announcement comes just as...
Apr. 27, 2015 10:45 AM EDT Reads: 1,434
IoT is still a vague buzzword for many people. In his session at @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, discussed the business value of IoT that goes far beyond the general public's perception that IoT is all about wearables and home consumer services. He also discussed how IoT is perceived by investors and how venture capitalist access this space. Other topics discussed were barriers to success, what is new, what is old, and what the future may hold. Mike Kavis is Vice President & Principal Cloud Architect at Cloud Technology Pa...
Apr. 27, 2015 10:00 AM EDT Reads: 6,220
@ThingsExpo has been named the Top 5 Most Influential Internet of Things Brand by Onalytica in the ‘The Internet of Things Landscape 2015: Top 100 Individuals and Brands.' Onalytica analyzed Twitter conversations around the #IoT debate to uncover the most influential brands and individuals driving the conversation. Onalytica captured data from 56,224 users. The PageRank based methodology they use to extract influencers on a particular topic (tweets mentioning #InternetofThings or #IoT in this case) takes into account the number and quality of contextual references that a user receives.
Apr. 27, 2015 10:00 AM EDT Reads: 2,020
Buzzword alert: Microservices and IoT at a DevOps conference? What could possibly go wrong? Join this panel of experts as they peel 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.
Apr. 27, 2015 10:00 AM EDT Reads: 2,221