This paper presents an architecturebased approach to runtime software. Software reconfiguration patterns for dynamic evolution of. In particular, the\ud main result of the research presented here is a framework which is\ud used to model and control the architecture of a software system. Dynamic software reconfiguration is needed for systems that need to evolve after they have been deployed and the configuration is required to be updated dynamically. The process of change implementation is an iteration of the development process where the revisions to the system are designed, implemented and tested. Software evolution basics of software evolution laws of software evolution requirements growth software aging basics of change management baselines, change requests and configuration management software families the product line approach requirements traceability importance of traceability traceability tools. Most rsabased evolution and adaptation approach should only be applied into proprietary systems. Over the past decades the laws have been revised and extended several times. However, the nature of componentbased software presents particularly unique challenges for testing componentbased systems. Architectural risk analysis is performed to enable the business to manage its risk at a more granular level. Georgas, jc 2005, knowledgebased architectural adaptation management for selfadaptive systems.
Classification and comparison of architecture evolutionreuse. Architecturecentric software evolution acse enables changes in systems structure and behaviour while maintaining a global view of the software to address evolutioncentric tradeoffs. Most languages have some form of runtime system, which implements control over the order in which work that was specified in terms of the language gets performed. Nenad medvidovic the software architecture research group. These five categories of themes represent an overview of the main topics of software architecture evolution research. In international conference on software engineering, kyoto, japan, april 1998. Security risk evolution for software and systems that are rapidly evolving, either during development or operation, there is a need for strong traceability between the target model and the risk model. In this paper, runtime software architecture rsa based on reflective middleware is proposed to support architecture based software maintenance and evolution. With openadaptive systems, new behaviours can be introduced at runtime with closedadaptive systems, all adaptive behaviour is fixed. Classification and comparison of architecture evolution. That paper, architecturebased runtime software evolution, has been judged the most influential paper of the 1998 conference and its three authors will be honored at the 2008 conference, the 30th in the series, scheduled to take place in leipzig, germany may 1018. Runtime environment of software are becoming more and more dynamic and open, while pervasive computing and web services further this approach. The book covers various aspects of economicsdriven architecting, including architecturebased economic modeling, tools and techniques for modularity decision support, the architecture and its relationship to project inception and evolution, economic aspects of architecture. He is a coauthor of the icse 1998 paper titled architecturebased runtime software evolution, which was recognized as that conferences most influential paper.
Presentation tier runtime architecture at runtime, the client user interface is generated by java server pages jsps compiled as servlets. Not saying any is easier than the other, just that they are very different disciplines. We present an architecturebased approach to runtime software evolution and. Another way to reuse software architecture evolution. Architectural runtime configuration management in support of. Approaches to scenario based software architecture analysis estimate the impact of a change based on change scenarios to a given architecture model. Several of his papers have won best paper awards at conferences and most cited recognitions from journals. The architecture was initially developed to support the safe online upgrade of feedback control and radar systems, regardless of whether there were faults in the modeling, design, and implementation of new. A lifecycle view of architecture analysis and design methods. Runtime recovery and manipulation of software architecture. Modern software systems are prone to a continuous evolution under frequently varying requirements and changes in operational environments. Abstract the growth of various software architectural frameworks and models provides a standard governing structure. An architecturebased approach to selfadaptive software.
A runtime system, also called runtime system, primarily implements portions of an execution model. Between 2009 and 20 medvidovic served as director of the usc center for systems and software engineering csse. Pdf the evolution of the laws of software evolution. This paper presents a changetracing model that regards the change as the starting point and focuses on software evolution in oo paradigm. This award is presented at each icse meeting to the authors of the paper from the icse meeting 10 years prior that is judged to have had the most influence on the theory or practice of software engineering during the 10 years since its original publication the award is jointly sponsored by acmsigsoft and ieee tcse. For these systems, runtime system evolution can mitigate the costs and risks associated with shutting down and restarting the system for an update. A largescale study of architectural evolution in open. We present an architecturebased approach to runtime software reconfiguration, highlighting the beneficial role of architectural styles and. Based on the insights provided by current robotic architectures, we elaborate. A pattern language for evolution reuse in componentbased. Manny lehman, a pioneer of the study of software changes, developed the laws of software evolution. The software applications have to be able to change in order to adapt to the environment evolution lehmans law.
Human and social factors have a very strong impact on the success of software development endeavours and the resulting system. However, approaches to architecture based software evolution do not estimate change effort and do not support automated change impact analysis. Section 4 advocates a generic architecturebased approach to runtime change management and demonstrates how different kinds of software evolution are supported at the architectural level. Challenges in exploiting architectural models for software. Figure 2 shows how to recover software architecture from a runtime system and adapt. He is chair of acm sigsoft and coauthor of software architecture. This can be done by building and maintaining traceability links between the. These laws describe recurring issues related to the evolution of etype software. Faculty software architecture research group at the. He is a fellow of the ieee and an acm distinguished scientist. Inversely, changes in the technology and software support, induce changes in the economic environment, i. On the basis of such analysis on rsa, our approach of rsabased software evolution consists of 3 parts. Runtime software architecture rsa can help maintainers to understand, control, adapt and evolve the system, while keep the system running. Itanium software conventions and runtime architecture.
As explained, each theme exhibits its specific research focus. Continuous availability is a critical requirement for an important class of software systems. It is vital to mention that architectural evolution in the context of servicesdriven software is particularly inclined towards accommodating processcentric changes weber et al. Runtime software architecture, online evolution, online adaptation. Proceedings of the 20th international conference on software engineering. Supporting software architecture evolution by functional. An architectural style perspective on dynamic robotic. Software architecture adaptability proceedings of the. Selfadaptive software requires high dependability, robustness, adaptability, and availability. Architecture based design software architecture is not just a phase or an activity in the software development life cycle, but a discipline pervading all phases of development. The purpose of this book is to introduce and discuss the concept of economicsdriven software architecture edsa. Saas dynamic evolution based on modeldriven software product lines. Section 5 describes the role components and connectors play in supporting architectural change. As shown in section 5, the proposed approach in conjunction with the fil technique achieves a speedup of around 253x compared to the matlab 2015b software simulation.
A decentralized mechanism for discovering software. This brandnew text covers all facets of software architecture and how it serves as the intellectual centerpiece of software development and evolution. Towards controlling software architecture erosion through. A software architecture for dependable and evolvable. Architecturebased runtime software evolution, oreizy et al. Our focus here is on architecturebased adaptation, which is one prominent approach to realise selfadaptation 2, 3, 4.
Modelbased selfadaptation of serviceoriented software systems. Architecture based evolution 17 can greatly benefit from dynamic reconfiguration. Architecturebased selfadaptive software 10 is under pinned by runtime software evolution using explicit architec tural models 11 and approaches the problem. Surprisingly, much of software engineering research in the last decade is technical, quantitative and deemphasizes the people aspect. Also related to our work is architecturebased software dynamic adaptation, which addresses the dynamic software recon. Software evolution is a phase in the software lifecycle where major changes in software are made. Paul rodrigues cto, wisdomtree software solutions, chennai, india. In dynamic architecture based software adaptation, it is necessary to. Architecture based runtime software evolution peyman oreizy nenad medvidovic richard n. Architecture evolution is the process of maintaining and adapting an existing software architecture to meet.
The laws of physics are there, but there are so many manmade layers of abstractions on top of it that good architecture is a lot less like what youd expect in a typical engineering discipline. Pdf dynamic architecture based evolution of enterprise. In this paper, runtime software architecture rsa based on reflective middleware is proposed to support architecturebased software maintenance and evolution. Usc viterbi school of engineering viterbi computer. To date there have been relatively few attempts to establish a sound theoretical. Architecturebased runtime software evolution peyman oreizy nenad medvidovic richard n. This is in contrast to the runtime lifecycle phase of a program, during which the runtime system is in operation. Continuous adaptation of software to keep its value for the user laws of software evolution lehman, 1996 increasing complexity of software systems northrop et al. Patterndriven reuse in architecturecentric evolution for. Central in architecturebased adaptation is the separation between the managed system, i.
Runtime architecture biztalk server microsoft docs. We present an architecturebased approach to runtime software evolution and highlight the role of software connectors in supporting runtime change. Software architecture, as the blueprint of software intensive systems, abstracts the complexities of modeling, design, development, and evolution phases of a software to. Medvidovic was the program cochair of the 2011 international conference on software engineering icse 2011. Eventually, this leads to outdated and thus useless architecture models. In previous work faitelson and tyszberowicz, 2015 we have described a technique for systematically decomposing a system into subsystems. An empirical study of architectural change in opensource. A framework for classifying and comparing architecture. Medvidovic is a coauthor of the icse 1998 paper titled architecturebased runtime software evolution, which was recognized as that conferences most influential paper. While the code structure of an initial implementation is likely to conform to its intended architecture, its dynamic properties cannot always be fully checked until deployment. Manny lehman, the father of software evolution, wrote many papers from the mid 70s onwards, proposing laws of software evolution for etype systems.
His research interests are centered on design and software architectures, especially eventbased and peertopeer systems and the. Software engineering software evolution geeksforgeeks. Moreover, when design complexity increases, the advantages of the fil methodology over software simulation at runtime will be more evident. Enterprise information systems have to coevolve with the enterprise they support. This paper describes an infrastructure supporting two simultaneous processes in selfadaptive software. Architectural decay is caused by repeated, sometimes careless changes to a system during its lifespan. Identifying these activities is a first step towards helping organizations tailor and embed the. Software architecture tools maulesh jhala hiren variava arpita patadia se682 june 7, 2004 slideshare uses cookies to improve functionality and performance, and to. An approach to reliable software architectures evolution. These problems arise when software architecture models are not kept consistent with the source code, e. A design is then made on which changes to implement in the next version of the system.
Chapter 8 runtime evolution of highly dynamic software. Runtime software architecture based on reflective middleware. This thesis presents work which is concerned with the runtime \ud evolution of componentbased software systems. He is a faculty associate of the institute for software research isr at the university of california, irvine. The key in such architecturebased maintenance and evolution is to recover. In this approach, the actual states and behaviors of the runtime system can be observed and manipulated in a consistent and understandable way through its architectural view. Software visualization 1,258 words case mismatch in snippet view article find links to article s. In software engineering, the laws of software evolution refer to a series of laws that lehman and belady formulated starting in 1974 with respect to software evolution. The unified software development process is representative of a number of architecture based development models that have been proposed in the industry.
Lehman, laws of software evolution revisited, fifth european workshop on software process technology ewspt96, pp. Internet of thing iot based systems support anytimeplace computations by interconnecting humans, systems, services, devices, and things that enabling autonomous systems to shapeup digitized societies. Runtime software architectural models for adaptation. Architecturebased runtime software evolution proceedings of the. Taylor appeared in the proceedings of the international conference on software engineering 1998 icse98. Incremental change adds new functionality to software and is one of the key principles of software evolution. Taylor is a chancellors professor emeritus of information and computer sciences at the university of california, irvine in the department of informatics. Abstract continuous availability is a critical requirement for an important class of software systems. The existing research and practices for acse primarily focus on designtime evolution and runtime adaptations to. Assumptions this paper makes the following assumptions. Software architecture is foundational to the development of large, practical software intensive applications. An architecture for constructing selfevolving software. Their combined citations are counted only for the first article. Runtime software architectural models for adaptation, recovery and evolution.
An architectural style perspective on dynamic robotic architectures john georgas and richard taylor abstractwe focus on the problem of developing robotic architectures which are wellsuited to supporting runtime evolution, rather than speci. We can use this technique to evaluate the effects of evolutionary changes to the systems structure, and to. The second law of thermodynamics as a theorem in quantum. A largescale study of architectural evolution in opensource. Check if you have access through your login credentials or your institution to get full access on this article. The software architecture based development model leads to software reuse, and reusability provides software engineers with a number of measurable benefits. Lehmans laws of software evolution searching for software evolution 46 found 62 total alternate case. The laws describe a balance between forces driving new developments on one hand, and forces that slow down progress on the other hand. Taylor, architecturebased runtime software evolution.
Citeseerx architecturebased runtime software evolution. Runtime software architecture based software evolution and. Dynamic architecture based evolution of enterprise information systems. Each theme stands for a research direction on its own, with only a subset of its research and application dedicated to the area of software architecture evolution. Medvidovics paper on architecturebased runtime software evolution, which appeared in the proceedings of the 1998 international conference on software engineering, was named in may 2008 that conferences most influential paper. Both pim and psm models can be used in runtime adaptation of software systems. Software architectural modeling offers a natural framework for designing and analyzing modern largescale software systems and for composing systems from reusable offtheshelf components. Despite decays prevalence, there is a relative dearth of empirical data regarding the nature of architectural changes that may lead to. Their evolution is the one of an important software system.
Secondary effects of software failures can include increased maintenance costs, increased customer support costs, longer time to market, legal, regulatory, and compliance impacts, and higher cost of development. Runtime system reconfiguration is one aspect of achieving continuous availability. Software architecture at runtime download scientific diagram. Knowledgebased architectural adaptation management for. Architecturebased dynamic evolution runtime environment. Software architecture refers to the fundamental structures of a software system and the. The simplex architecture is a software architecture based on open system components.
Oreizy p, medvidovic n, taylor rn 1998 architecture based runtime software evolution. It does not define operatingsystem interfaces or any conventions specific to any single operating system. Software architecture, formal language, evolution scenarios, enterprise information system. Viterbi faculty directory usc viterbi school of engineering. Software systems are becoming larger, more complex, and difficult for maintenance and evolution. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Roselin mary department of information technology, hindustan university, chennai, india. On the role of software architectures in runtime system. A reflective architecture to support dynamic software evolution. Dynamic evolution is based on the runtime evolution of software, mainly characterized as software selfadapting to environment.
Critically, this text focuses on supporting creation of real implemented systems. Medvidovics research interests are in the area of architecturebased software development. A pattern language for evolution reuse in component based software architectures abstract context. Architecturebased design institute for software research. Lifecycle based study framework of software evolution. Itanium software conventions and runtime architecture guide 11 introduction 1 this document describes common software conventions for the itanium architecture. In this paper, runtime software architecture rsa based on reflective. We conclude in section 5 by summarizing the relationship between lifecycle stages and architecture based activities. An architecture based on computing with words to support. He is a coauthor of a textbook on software architectures.
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