InfoQ Homepage Design Content on InfoQ
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Presentation: Mock Roles Not Object States
In this presentation filmed during QCon London 2007, Nat Pryce and Steve Freeman talk about TDD using Mock Objects. In their opinion, Mock Objects improves the software design and makes the code more easier to maintain and adapt to changing requirements.
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Article: Domain-Driven Design at the Center of an Evolving Architecture
Domain driven design can be most readily applied to stable domains but it becomes more challenging when the domain itself is in a state of flux and development. This is common in Agile projects, and happens also when the business itself is trying to evolve. This article examines how we used DDD in the context of a two-year programme of work to rethink and rebuild guardian.co.uk.
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Article: Ian Robinson on Consumer-driven Contracts
In a new article, ThoughtWorks' Ian Robinson discusses how consumer-driven contracts, in the form of "stories for services" and unit tests exchanged between service development streams, can strengthen the service-oriented development lifecycle. In contrast to contracts defined from the POV of the provider, consumer-driven contracts result from combining the demands of all known service consumers.
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Presentation: Operational Scalability in the Next Generation Web World
In this presentation filmed during JAOO 2007, Wayne Fenton, Director of Architecture at eBay Inc., talks about the ways in which software architects can design systems for much-improved efficiency and reliability from an operational perspective.
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Presentation: Managing Variability in Product-Lines
Managing commonality and variability is the core of product line engineering. In this presentation, Markus Völter illustrates how model-driven and aspect oriented software development help addressing the challenge of managing variability in product line engineering.
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Presentation: Steve Vinoski on REST
In a presentation recorded at QCon San Francisco, CORBA guru Steve Vinoski introduces REST from the perspective of a traditional SOA person. He explains the goals of the various constraints REST imposes, and the desirable properties one can gain from adhering to them. In a hypothetical discussion with a "SOA guy", Steve addresses various frequent doubts people express when they first look at REST.
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MindScape Has Released LightSpeed 2.0
MindScape has released version 2.0 of their domain modeling and ORM tool. LightSpeed 2.0 includes a visual domain model designer integrated with Visual Studio 2008, support for LINQ and the ability to access multiple databases concurrently.
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Opinion: When Designing Your SOA - Taste is Everything
Dan Creswell claims that "taste is everything" when it comes to putting together the pieces that make a good SOA. Dan says that picking the technology stack for distributed services, how you layer the service "units", etc, are a matter of taste as well as consideration of a number of guidelines, as opposed to just taking a cookie cutter approach to SOA as some seem to claim is possible.
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Loose Coupling in SOA Defined
In the debate on whether cohesion is important for SOA, Carlos Perez expressed his views on coupling in software construction, and how it has evolved in the context of an SOA. He starts out with Bertrand Meyer's principles of modularity and extends it to his own set of principles for service orientation.
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Interview: Randy Shoup Discusses the eBay Architecture
In this interview from QCon San Francisco 2007, Randy Shoup discusses the architecture of eBay. Topics discussed include eBay's architectural principles, horizontal and vertical partitioning, ACID vs. BASE, handling data inconsistency, distributed caching, updating eBay on the fly, architectural and coding standards, eBay's search infrastructure, grid computing, and SOA.
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Designing for Spam: A Challenge for the Web?
The increasing activity and hostility of spammers and the sophistication of their spamming tools are a constantly growing concern for the web. The recent spam attack on Craigslist triggered many reactions in the blogosphere seeking to analyze spammers’ techniques and possible remedies and to consider the implications that the spam’s spread may have on architecture.
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Windows Communication Foundation: Application Deployment Scenarios
Microsoft has just published an excellent overview of WCF capabilities and deployment strategies for 5 most common SOA scenarios including Enterprise Web services, Web 2.0 services, intranet applications, queued messaging and Workflow services.
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Adopting Simple Design
A discussion about simple design is taking place on the extremeprogramming Yahoo! group that has already resulted in several useful recommendations. The discussion started off with a request for references concerning incremental design and quickly morphed into one about successfully adopting incremental design.
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Presentation: Patterns for securing architectures
Security is about trade-offs you make with your limited resources, often a problem when designing a system or an after-thought. Few have the expertise to design good security and most development teams have no security expert. In this talk, Peter Sommerlad focuses on Security Patterns for designing security in architectures, such as Role-based Access Control, Single Access Point, and Front Door.
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Debate: Should Architecture Rewrite be Avoided?
As it gets more and more difficult to adapt software to new demands, the temptation to rebuild it in order to update the architecture grows stronger. For this risky undertaking it is essential to choose the right strategy. Several authors provide insights into advantages and disadvantages of different possible options in terms of cost, technical complexity and potential commercial risk.