Software architecture foundations, theory, and practice architecturecentric evolution process motivation evaluation or assessment design and choice of approach action includes preparation for the next round of adaptation. The right side sketches the refactored architecture and identifies related design. There is no complicated connectivity in place between the application and the data, which means minimises the amount of time it takes to retrieve data when required and it reduces the complexity of the solution so there is less to go wrong. A software architecture is a shared mental model of. This paper presents architecturecentric software migration, an approach which has been used to improve web systems in two projects. Architecture, the art and technique of designing and building, as distinguished from the skills associated with construction. However codecentric evolution techniques have not managed to effectively solve the problems that software evolution entails. We develop the overarching idea that the evolutionary dynamics of platformbased ecosystems and their modules is influenced by the coevolution of the platforms owners choices endogenous to the ecosystem e. Architecturecentric evolution process provides a controlled support for componentbased software evolution that prevents architecture drift and erosion 8. So, software architecture can exist in different phases of the whole software lifecycle christine 2000. Its goal is to increase the potential for evolution by conversion of a webbased system into one that is implemented in a different programming language. Architecture centric software evolution by software metrics and design patterns. It is shown how software metrics and architectural patterns can be used for the management of software evolution. In the presented architecturecentric software evolution method the quality of a software system is assured in the software design phase by computing various kinds of design metrics from the system architecture, by automatically exploring instances of design patterns and.
Architecturecentric software evolution acse is considered as an approach to support software adaptation at a controllable level of abstraction in order to survive in the. Critically, this text focuses on supporting creation of real implemented systems. Continuous deliverables that accelerate the creation of architecture artifacts and allows reusable incremental analysis, design, and best practices. The architecture centric development method acdm can be differentiated from these extremes in that acdm places the software architecture at the center of a development effort rather than software processes.
A task centric view on software evolution abstract. In a previous computer column, how business goals drive architectural design aug. This requires evolution in system structure and behavior that could be modeled, analyzed and evolved in a formal way. Software evolution has largely been focused on lowlevel implementation artefacts through refactoring techniques rather than the architectural level. The theme of architecturecentric evolution is complex and multifaceted, both in its core and in its relevance to other advances of software engineering. The notion of buildonce, useoften empowers the role of an architect to model and execute generic and potentially reusable solution to recurring architecture evolution problems. This brandnew text covers all facets of software architecture and how it serves as the intellectual centerpiece of software development and evolution.
I introduced the multistyle, api centric architecture as one option to gain the benefits of externally exposed apis while also providing for functional evolution and technical scalability. In 6th european conference on software maintenance and reengineering csmr 2002, 11 march 2002, budapest, hungary, proceedings. In this architecture, the behaviors of domain concepts. An ontologycentric architecture for extensible scienti c. Institutionalizing benefits validation reforms the funding function of project portfolio management in traditional project centric it whereas the move to product centric it disrupts to good effect the function altogether. In my view, an architectural refactoring revisits certain architectural decisions 3 and selects alternate solutions to a given set of design problems. To overcome this inhibitor, we take a task centric view on the subject and introduce an architectural refactoring template that highlights the architectural decisions to be revisited when refactoring application architectures for the cloud. Figure 1 utility principle with multistyle api centric architecture. A framework for classifying and comparing architecture. Architecturecentric software evolution by software. For example, code refactoring restructures code to make it more maintainable without changing its observable behavior.
Architecture centric software evolution acse supports frequent business and technical change cycles in software at higher abstraction levels. Architecturecentric software development claudio riva principal scientist. Architecturecentric development produces descriptions for architecture speci. Architecture offers abstractions on the key properties, structure, and behavior of software systems and thus imposes order on the inherent complexity. We are looking at approaches to help bridge this gap of architecture centric software evolution. Architectural refactoring a taskcentric view on software. How productcentric it disrupts portfolio management. An architecturecentric approach to the development of a. The evolution of enterprise architecture smarter with. The proposed metric is based on a mathematical model representing the maintainability snapshot of a system. Software architecture model therefore provides required abstraction and facilitates the reasoning about the evolution of system expressed by a model s, d in a formal theory ex. Cais research focuses on software design, software architecture, software evolution, and software economics. Architecture also connects software systems to development organizations, processes, and other.
An architecturecentric evolution perspective rami bahsoon1 and wolfgang emmerich2 1school of engineering and applied science, computer sc, aston university birmingham, uk, r. A study on the role of software architecture in the. The paper shows how dedal, a threelevel adl, can be used to support the consistent description of these three artifacts. Existing research and practices comprises a wide spectrum of evolution centric. Computer science department, george mason university, usa software engineering department, rochester institute of technology, usa computer science department, drexel university, usa. Architecturecentricevolution ace that merges functional and architecture roadmaps, with transparent and visible execution of architecture imperatives. Runtime software architecture based software evolution and. As such, 50% of ea programs will be supported by aienabled software for planning, governance, assurance and it asset management purposes by 2022. Software architecture is foundational to the development of large, practical software intensive applications. Architecturecentric software evolution acse is considered as an. The implications of networkcentric software systems on. Although these two ends may be distinguished, they cannot be separated, and the relative weight given to each can vary. Her work aims at using scientific theory to guide software practice, for the purpose of improving software quality and productivity.
Structural complexity in architecturecentric software. Software architecture, as a vehicle for communication and reasoning about software systems and their quality, is becoming an area of focus in both the forward and reverseengineering communities. Patterndriven reuse in architecturecentric evolution for. A study on the role of software architecture in the evolution and quality of software ehsan kouroshfar. Based on this discussion, architecturecentric software migration will be described in greater detail and supplemented by the introduction and evaluation of two strategies for the practical implementation of the migration process. Rsa describes sa at runtime, which treats sa at design phase dsa as the centric and basic role, but adds much more runtime information to it. Academics in architecturecentric software evolution. Software systems are increasingly required to operate in an open world, characterized by continuous changes in the environment and in the prescribed requirements. Citeseerx architecturecentric evolution in software. Like architectures in the building and construction industries, acdm. Ea traditionally focuses on the people, processes, information and technology of the enterprise and their relationships to one another to make decisions about futurestate architecture. The advantage of a gating approach via architecture design is the potential savings in downstream maintenance costs due to conformant code. The advantage of the servercentric approach is that the data required by that application is directly attached to the computer resource that requires it.
Markov model and the requirements which are specified in a formal language ex. The left side presents an architectural smell as observed in a particular context such as viewpoint or abstraction level, pertaining to certain quality attribute qa concerns. In the presented architecture centric software evolution method the quality of a software system is assured in the software design phase by computing. A refactoring aims to improve a certain quality while preserving others. In the presented architecturecentric software evolution method the quality of a software system is assured in the software design phase by computing various kinds of design metrics from the system architecture, by automatically exploring instances of design patterns and antipatterns from the architecture, and by reporting potential quality problems to the designers. Patterndriven reuse in architecture centric evolution for. View academics in architecturecentric software evolution on academia. Architecture is the key factor for success in the development and evolution of software systems. The practice of architecture is employed to fulfill both practical and expressive requirements, and thus it serves both utilitarian and aesthetic ends. An architecturecentric software maintainability assessment 3 an international standard for the evaluation of software. In essence, software architecture is the best means for facilitating the synchronization of the system requirements and its implementation during the evolution cycles.
A model of enterprise architecture evolution ayed said alwadain thesis submitted to the information systems school, faculty of science and engineering in partial. Continuous deliverables that accelerate the creation of architecture artifacts and allows. The architecturecentric evolution approach described in this paper uses a model driven architecture concept in which uml models of the software architecture are developed prior to implementation and later evolved after original deployment. The following is the outline for the rest of the paper. Architecturecentric software evolution acse is considered as an approach to support software adaptation at a controllable level of abstraction in order to survive in the uncertain environment. Architecture centric software evolution by software.
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