Welcome!

Microsoft Cloud Authors: Janakiram MSV, Yeshim Deniz, David H Deans, Andreas Grabner, Stackify Blog

Related Topics: Microsoft Cloud, @CloudExpo

Microsoft Cloud: Blog Feed Post

Code Contracts in .NET Help Distributed Software Development Teams

The notion of design-by-contract programming has been around for quite a while

Microsoft’s Research in Software Engineering (RiSE) team is on to something.  Luckily, for developers around the world, they have released it to the public.  I’m talking about Code Contracts in Microsoft .NET.  Code Contracts are very useful under any circumstance; however, they are particularly useful in helping distributed software development teams increase team efficiency, improve product quality, and mitigate against risks associated with team dispersion.

The notion of design-by-contract programming has been around for quite a while.  In fact, Bertrand Meyer (founder of Eiffel) was writing about the trade marked Design by Contract approach as early as 1992.  Design-by-contract programming, according to Meyer, is a fundamental but often overlooked tenant of object oriented programming.  The addition of design-by-contract programming into the .NET framework provides a mechanism by which all .NET languages can benefit from increased reliability.

Code

Distributed software development teams will find Code Contracts particularly useful.  Distributed teams deal with the same issues as non-distributed teams.  In addition; however, the distributed team must manage through issues related to communication, location, and sometimes culture.  Development assignments, in the distributed team scenario, are often partitioned along horizontal or vertical boundaries.  Parallel implementation typically requires up-front design and agreement upon the application interfaces.  This allows the team members, or sub-teams, to code independently of one another.  This approach requires a fair amount of blind trust that the various parts of the application will function as designed.  Code Contracts eliminate the need for blind trust.

Consumers of internal and external APIs that include Code Contracts will know that all of the contract-defined pre- and post-conditions have been met.  This will not only engender trust in current development efforts, it will support the promotion of code/object/service re-use during future development efforts.

Additionally, code contracts:

  • Make the product stabilization process more efficient by weeding out potential run-time errors at compile time.  In a distributed team, this reduces the probability that one group wastes time unknowingly debugging errors introduced by a remote group.  Additionally, it helps reduce the vicious cycle of compile-deploy-test-debug-compile-deploy-test; which can be very time consuming and, thus, expensive.
  • Enhance the continuous integration process by leveraging contracts to generate more meaningful unit tests.  Improved testing and the guarantee that preconditions and postconditions have been met combine to produce more robust, higher quality software.
  • Empower the software architects with additional tools that allow them to programmatically constrain developers.  This is quite useful when managing offshore teams.  In this scenario, the design-by-contract approach can help reduce documentation-derived management overhead and increase quality and reliability at the same time.

The announcement of .NET Code Contracts was a pleasant surprise, as it represents a maturity milestone for the Microsoft .NET platform.  I look forward to adopting it because it gives my software architects another tool that can be leveraged to enforce the architectural fidelity of our products.

Code Contracts can be downloaded for use with Visual Studio 2008 Team System.  The Code Contracts library will be included as a native namespace in the .NET Frameworks 4.0 release.  Mike Barnett provides a great Code Contract tutorial on channel9.msdn.com.

Photo credit David Reeves, El Fotopakismo.

More Stories By Walter Pinson

Walter Pinson is the Chief Software Architect at SMBLive; whose IAmFound social marketing platform helps SMBs (small and medium-sized businesses) get discovered online and generate inbound sales leads. In his role as CSA, Walter manages a globally distributed product development group and has SaaS products deployed at major telecommunications channel partners in the US, UK, Switzerland, Canada, and Mexico. Additionally, Walter is a co-founder and principal of Pinson3 Systems; a boutique software engineering concern serving the intelligence and defense sectors with solutions ranging from enterprise web-based multi-modal biometric analysis systems to information warfare training systems. Prior to his role at SMBLive and founding Pinson3 Systems, Walter was a Senior Strategy Consultant with Microsoft focused on SaaS, SOA, and .NET adoption in the telecommunications sector. Walter has published articles for Cloud Computing Journal, is a member of ACM and IEEE, and currently has one patent pending. He holds a bachelor's degree in computer science from The Volgenau School of Information Technology and Engineering at George Mason University, where he focused on distributed and parallel computing. Walter is currently working on his MBA at the GMU School of Management.

@ThingsExpo Stories
Widespread fragmentation is stalling the growth of the IIoT and making it difficult for partners to work together. The number of software platforms, apps, hardware and connectivity standards is creating paralysis among businesses that are afraid of being locked into a solution. EdgeX Foundry is unifying the community around a common IoT edge framework and an ecosystem of interoperable components.
"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.
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...
"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.
"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...
"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.
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 ...
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.
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...
"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...
"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.
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...
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.
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...