Welcome to our book review site www.go-pdf.online!
You may have to Search all our reviewed books and magazines, click the sign up button below to create a free account.
Agile Software Architecture
Many discussions in the agile community circle around emergent architecture. The idea is that explicit architectural work is not needed anymore besides an initial architectural vision. Instead, the architecture would emerge from a cycle of implementation and refactoring guided by a few design principles, and this approach would automatically lead to the smallest architecture possible. This chapter shows that this proposition is only partially correct. Starting with the activities and objectives of architectural work, it shows that emergent architecture is providing a valuable alternative to conventional architecture approaches in some areas of architectural work, whereas it does not support other areas at all. On the basis of these findings, a joint approach for architectural work in an agile setting is presented.
Agile Software Architecture
This chapter looks at the delivery of large, complex system development projects that typically require the development and integration of multiple systems and the coordination of hundreds of individuals. We argue that traditional agile development techniques that persuade against the use of architectures and processes can fail or provide suboptimal delivery in such situations. It is argued that elements of software, infrastructure, and data architecture are necessary prerequisites for the successful delivery of complex agile system development projects. The chapter suggests that these architectural elements should be identified in each project via a risk-based approach. These resulting architecture elements can then be used by a distributed low-cost delivery organization to reduce rework within the agile software development process and accelerate delivery by maximizing the overall delivery pipeline. The chapter argues that this agile architecting technique successfully enables the low-cost and low-risk delivery of complex agile system development projects.
Agile Software Architecture
Organizations must adapt to survive, and their ability to change and innovate is driven by two key enablers - architecture and agile. Based on practical experiences of working with several clients adopting both architecture and agile practices, the author sheds light on those factors that resulted in successful transformations and the creation of a platform for innovation. The author concludes that architecture and agile practices are complementary and that their successful introduction within an organization is not just technical in nature, but also requires a focus on people and appropriate techniques for managing organizational change.
Agile Software Architecture
Architecturally significant requirements (ASRs) drive and constrain many aspects of architecture. Eliciting and analyzing these requirements in the early phases of a project means that quality concerns can be discovered and addressed during the architectural design. This reduces the risk of costly and unnecessary refactoring. The challenge of emerging requirements is particularly evident in agile projects, which are inherently incremental; however, existing techniques for eliciting ASRs, such as win-win and i*, are typically rejected by agile development teams as being somewhat heavyweight. In this chapter, we present the notion of an architecturally savvy persona (ASP), which is used to emerge and analyze stakeholders’ quality concerns and to drive and validate the architectural design. ASPs are useful for discovering, analyzing, and managing ASRs, and designing and validating high-level architectural solutions that balance tradeoffs and satisfy stakeholders’ concerns. We show how ASPs can be used to discover quality concerns, drive architectural design, and preserve architectural qualities during long-term maintenance activities.
Agile Software Architecture
This chapter describes how to systematically prevent software architecture erosion by applying refactoring techniques. Software architecture modifications are common rather than the exception in software development. Modifications come in different flavors, such as redefining or adding requirements, changing infrastructure and technology, or causing changes by bugs and incorrect decisions. But no matter where these changes originate, they need special attention from software architects. Otherwise, if software architects merely focus on adding new features—(changes or extensions that by themselves might not be adequate), design erosion will be the final result. In a systematic approach, sof...
Agile Software Architecture
Large enterprise organizations are increasingly turning to the use of agile approaches for their information technology (IT) development and are encountering a range of challenges that were not faced by the early, usually smaller, agile adopters. Enterprise-scale organizations frequently have complex organizational structures and complex IT estates, including a mix of legacy and modern applications. Both of these attributes have a negative impact on the ease with which agile principles and practices can be applied. This chapter describes the experiences of Aviva UK during our early agile transformation journey. We describe the challenges that we faced, focusing particularly on those relating to our IT architecture, and we discuss the three architecture strategies that we put in place to drive success: These strategies have been developed based on both our own experience and the input and experience of agile consultants .We believe that they will be key drivers for success in any large corporate organization with an IT estate that includes both legacy and modern applications.
Agile Software Architecture
We find surprisingly strong parallels in a playful comparison of the progression of thought in the architecture of the built world and its namesake in software. While some architectural progression in both fields owes to fashion, much more of it owes to learning—in both the field of design and collective human endeavor. We have been working on a paradigm called DCI (Data, Context, and Interaction) that places the human experiences of design and use of programs equally at center stage. It brings software design out of the technology-laced modern school of the 1980s into a postmodern era that places human experience at the center. DCI offers a vision of computers and people being mutually alive in the sense of Christopher Alexander’s great design. DCI opens a dialog contrasting metaphors of collective human reasoning and Kay’s vision of object computation, as well as a dialog between the schools of design in the built world and in software.
Agile Software Architecture
Verifying the security posture as a system evolves is indispensable for building deployable software systems. Traditional security testing lacks flexibility in (1) providing early feedback to the architect on the ability of the software to predict security threats so that changes are made before the system is built, (2) responding to changes in user and behavior requirements that could affect the security of software, and (3) offering real design fixes that do not merely hide the symptoms of the problem (i.e., patching). We motivate the need for an architecture-level testing for security grounded on incremental and continuous refinements to support agile principles. We use architecture as an...
Agile Software Architecture
Running a dedicated instance of a software application can be burdensome to a customer if it involves a large amount of memory and processing overhead or a licensing fee or if the customer is a small company. Multitenancy (MT) architectures (MTAs) allow for multiple customers (i.e., tenants) to be consolidated into the same operational system, hence reducing the overhead via amortization over several customers. Lately, MTAs are drawing increasing attention because MT is regarded as an essential attribute of cloud computing and its new software delivery model, Software as a Service. In a moment of debate about the coexistence between architecture and agility, we introduce in this chapter a mu...
Interactions in Ultracold Gases
Arising from a workshop, this book surveys the physics of ultracold atoms and molecules taking into consideration the latest research on ultracold phenomena, such as Bose Einstein condensation and quantum computing. Several reputed authors provide an introduction to the field, covering recent experimental results on atom and molecule cooling as well as the theoretical treatment.
