|By David Dossot||
|December 31, 2012 07:15 AM EST||
In "Final Parameters and Local Variables", Dr. Heinz M. Kabutz rants against the generalized used of the final keyword in Java code. For him, this is a "trend' and an "idiotic coding standard".
I'm a firm believer of the complete opposite.
As a software developer, I spend most of my time reasoning about code. Anything that can make this reasoning easier is welcome. Good practices like short methods and descriptive names fall in this category. I believe immutable variables do too.
Immutable variables simplify reasoning because they ensure a stable state within a scope, whether it's a whole class or a single method. Having established invariants is a tremendous help in understanding code.
Whether it is with my own code or not, I've experienced time and again that my mental load was way lower with immutable variables than mutable ones. Maybe it's just a limitation of my own brain power, but, to me, less mental load translates in deeper understanding. And to the contrary, finding out amid-function that one of its argument has been reassigned creates an intense sense of confusion, prompting to re-read the method again. And again.
Of course, this isn't 100% true in Java, mainly because its default data structures are unfortunately mutable. But still, the comfort gained by using the final keyword everywhere, and actually letting your favorite IDE do it for you, far outweighs the small visual clutter it creates.
Unsurprisingly, I'm of the same opinion about early returns and loop breaks, but this is for another debate...
Dr. Kabutz will certainly argue that this is a matter of personal discipline or talent to ensure that one doesn't mess with invariants, because he doesn't "need the compiler to tell [him] this". Again I disagree. I don't trust myself to be on top of things at all time so I want the compiler to tell me everything... and more. I want Findbugs to scrutinize everything I write and break the build if I've been sloppy. I want Checkstyle to reject my code if it isn't compliant to whatever standard is enforced on the project I'm working on.
I do agree on one thing that Dr. Kabutz said though, which is that using the final keyword everywhere in printed books' code snippets is an annoyance. Indeed, books formatting rules constraints on code samples are so stringent (think 71 columns) that the rules of readability are tipped towards "less code as possible".
What is your experience with final variables everywhere? Love, hate or ...
Application availability is not just the measure of “being up”. Many apps can claim that status. Technically they are running and responding to requests, but at a rate which users would certainly interpret as being down. That’s because excessive load times can (and will be) interpreted as “not available.” That’s why it’s important to view ensuring application availability as requiring attention to all its composite parts: scalability, performance, and security.
Oct. 10, 2015 12:00 PM EDT Reads: 444
In their session at DevOps Summit, Asaf Yigal, co-founder and the VP of Product at Logz.io, and Tomer Levy, co-founder and CEO of Logz.io, will explore the entire process that they have undergone – through research, benchmarking, implementation, optimization, and customer success – in developing a processing engine that can handle petabytes of data. They will also discuss the requirements of such an engine in terms of scalability, resilience, security, and availability along with how the archi...
Oct. 10, 2015 12:00 PM EDT Reads: 413
DevOps has often been described in terms of CAMS: Culture, Automation, Measuring, Sharing. While we’ve seen a lot of focus on the “A” and even on the “M”, there are very few examples of why the “C" is equally important in the DevOps equation. In her session at @DevOps Summit, Lori MacVittie, of F5 Networks, will explore HTTP/1 and HTTP/2 along with Microservices to illustrate why a collaborative culture between Dev, Ops, and the Network is critical to ensuring success.
Oct. 10, 2015 12:00 PM EDT Reads: 173
Our guest on the podcast this week is Jason Bloomberg, President at Intellyx. When we build services we want them to be lightweight, stateless and scalable while doing one thing really well. In today's cloud world, we're revisiting what to takes to make a good service in the first place. Listen in to learn why following "the book" doesn't necessarily mean that you're solving key business problems.
Oct. 10, 2015 12:00 PM EDT Reads: 2,242
Overgrown applications have given way to modular applications, driven by the need to break larger problems into smaller problems. Similarly large monolithic development processes have been forced to be broken into smaller agile development cycles. Looking at trends in software development, microservices architectures meet the same demands. Additional benefits of microservices architectures are compartmentalization and a limited impact of service failure versus a complete software malfunction....
Oct. 10, 2015 11:30 AM EDT Reads: 285
For it to be SOA – let alone SOA done right – we need to pin down just what "SOA done wrong" might be. First-generation SOA with Web Services and ESBs, perhaps? But then there's second-generation, REST-based SOA. More lightweight and cloud-friendly, but many REST-based SOA practices predate the microservices wave. Today, microservices and containers go hand in hand – only the details of "container-oriented architecture" are largely on the drawing board – and are not likely to look much like S...
Oct. 10, 2015 11:00 AM EDT Reads: 537
The last decade was about virtual machines, but the next one is about containers. Containers enable a service to run on any host at any time. Traditional tools are starting to show cracks because they were not designed for this level of application portability. Now is the time to look at new ways to deploy and manage applications at scale. In his session at @DevOpsSummit, Brian “Redbeard” Harrington, a principal architect at CoreOS, will examine how CoreOS helps teams run in production. Attende...
Oct. 10, 2015 11:00 AM EDT Reads: 1,281
Docker is hot. However, as Docker container use spreads into more mature production pipelines, there can be issues about control of Docker images to ensure they are production-ready. Is a promotion-based model appropriate to control and track the flow of Docker images from development to production? In his session at DevOps Summit, Fred Simon, Co-founder and Chief Architect of JFrog, will demonstrate how to implement a promotion model for Docker images using a binary repository, and then show h...
Oct. 10, 2015 11:00 AM EDT Reads: 229
Any Ops team trying to support a company in today’s cloud-connected world knows that a new way of thinking is required – one just as dramatic than the shift from Ops to DevOps. The diversity of modern operations requires teams to focus their impact on breadth vs. depth. In his session at DevOps Summit, Adam Serediuk, Director of Operations at xMatters, Inc., will discuss the strategic requirements of evolving from Ops to DevOps, and why modern Operations has begun leveraging the “NoOps” approa...
Oct. 10, 2015 10:00 AM EDT Reads: 183
With containerization using Docker, the orchestration of containers using Kubernetes, the self-service model for provisioning your projects and applications and the workflows we built in OpenShift is the best in class Platform as a Service that enables introducing DevOps into your organization with ease. In his session at DevOps Summit, Veer Muchandi, PaaS evangelist with RedHat, will provide a deep dive overview of OpenShift v3 and demonstrate how it helps with DevOps.
Oct. 10, 2015 10:00 AM EDT Reads: 691
What Is Emergent About Emergent Architecture? By @TheEbizWizard | @DevOpsSummit #DevOps #BigData #API
All we need to do is have our teams self-organize, and behold! Emergent design and/or architecture springs up out of the nothingness! If only it were that easy, right? I follow in the footsteps of so many people who have long wondered at the meanings of such simple words, as though they were dogma from on high. Emerge? Self-organizing? Profound, to be sure. But what do we really make of this sentence?
Oct. 10, 2015 08:00 AM EDT Reads: 430
Containers are changing the security landscape for software development and deployment. As with any security solutions, security approaches that work for developers, operations personnel and security professionals is a requirement. In his session at @DevOpsSummit, Kevin Gilpin, CTO and Co-Founder of Conjur, will discuss various security considerations for container-based infrastructure and related DevOps workflows.
Oct. 10, 2015 06:00 AM EDT Reads: 283
There once was a time when testers operated on their own, in isolation. They’d huddle as a group around the harsh glow of dozens of CRT monitors, clicking through GUIs and recording results. Anxiously, they’d wait for the developers in the other room to fix the bugs they found, yet they’d frequently leave the office disappointed as issues were filed away as non-critical. These teams would rarely interact, save for those scarce moments when a coder would wander in needing to reproduce a particula...
Oct. 10, 2015 05:00 AM EDT Reads: 345
Last month, my partners in crime – Carmen DeArdo from Nationwide, Lee Reid, my colleague from IBM and I wrote a 3-part series of blog posts on DevOps.com. We titled our posts the Simple Math, Calculus and Art of DevOps. I would venture to say these are must-reads for any organization adopting DevOps. We examined all three ascpects – the Cultural, Automation and Process improvement side of DevOps. One of the key underlying themes of the three posts was the need for Cultural change – things like t...
Oct. 10, 2015 05:00 AM EDT Reads: 363
It is with great pleasure that I am able to announce that Jesse Proudman, Blue Box CTO, has been appointed to the position of IBM Distinguished Engineer. Jesse is the first employee at Blue Box to receive this honor, and I’m quite confident there will be more to follow given the amazing talent at Blue Box with whom I have had the pleasure to collaborate. I’d like to provide an overview of what it means to become an IBM Distinguished Engineer.
Oct. 10, 2015 04:00 AM EDT Reads: 289
The cloud has reached mainstream IT. Those 18.7 million data centers out there (server closets to corporate data centers to colocation deployments) are moving to the cloud. In his session at 17th Cloud Expo, Achim Weiss, CEO & co-founder of ProfitBricks, will share how two companies – one in the U.S. and one in Germany – are achieving their goals with cloud infrastructure. More than a case study, he will share the details of how they prioritized their cloud computing infrastructure deployments ...
Oct. 10, 2015 03:00 AM EDT Reads: 760
Ten years ago, there may have been only a single application that talked directly to the database and spit out HTML; customer service, sales - most of the organizations I work with have been moving toward a design philosophy more like unix, where each application consists of a series of small tools stitched together. In web example above, that likely means a login service combines with webpages that call other services - like enter and update record. That allows the customer service team to writ...
Oct. 10, 2015 02:45 AM EDT Reads: 476
As we increasingly rely on technology to improve the quality and efficiency of our personal and professional lives, software has become the key business differentiator. Organizations must release software faster, as well as ensure the safety, security, and reliability of their applications. The option to make trade-offs between time and quality no longer exists—software teams must deliver quality and speed. To meet these expectations, businesses have shifted from more traditional approaches of d...
Oct. 10, 2015 02:15 AM EDT Reads: 259
Between the compelling mockups and specs produced by analysts, and resulting applications built by developers, there exists a gulf where projects fail, costs spiral, and applications disappoint. Methodologies like Agile attempt to address this with intensified communication, with partial success but many limitations. In his session at DevOps Summit, Charles Kendrick, CTO and Chief Architect at Isomorphic Software, will present a revolutionary model enabled by new technologies. Learn how busine...
Oct. 10, 2015 02:00 AM EDT Reads: 328
If you are new to Python, you might be confused about the different versions that are available. Although Python 3 is the latest generation of the language, many programmers still use Python 2.7, the final update to Python 2, which was released in 2010. There is currently no clear-cut answer to the question of which version of Python you should use; the decision depends on what you want to achieve. While Python 3 is clearly the future of the language, some programmers choose to remain with Py...
Oct. 10, 2015 02:00 AM EDT Reads: 284