Working With Legacy Systems

Author : Michael Feathers
Publisher : Prentice Hall Professional
Page : 457 pages
File Size : 50,5 Mb
Release : 2004-09-22
Category : Computers
ISBN : 9780132931755

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Working Effectively with Legacy Code by Michael Feathers Pdf

Get more out of your legacy systems: more performance, functionality, reliability, and manageability Is your code easy to change? Can you get nearly instantaneous feedback when you do change it? Do you understand it? If the answer to any of these questions is no, you have legacy code, and it is draining time and money away from your development efforts. In this book, Michael Feathers offers start-to-finish strategies for working more effectively with large, untested legacy code bases. This book draws on material Michael created for his renowned Object Mentor seminars: techniques Michael has used in mentoring to help hundreds of developers, technical managers, and testers bring their legacy systems under control. The topics covered include Understanding the mechanics of software change: adding features, fixing bugs, improving design, optimizing performance Getting legacy code into a test harness Writing tests that protect you against introducing new problems Techniques that can be used with any language or platform—with examples in Java, C++, C, and C# Accurately identifying where code changes need to be made Coping with legacy systems that aren't object-oriented Handling applications that don't seem to have any structure This book also includes a catalog of twenty-four dependency-breaking techniques that help you work with program elements in isolation and make safer changes.

Author : Robert Annett
Publisher : Packt Publishing Ltd
Page : 152 pages
File Size : 52,6 Mb
Release : 2019-06-03
Category : Computers
ISBN : 9781838988579

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Working with Legacy Systems by Robert Annett Pdf

The IT industry is obsessed with new technologies. Courses, books, and magazines mostly focus on what is new. Starting with what a legacy system looks like to applying various techniques for maintaining and securing these systems, this book gives you all the knowledge you need to maintain a legacy system.

Author : Chris Birchall
Publisher : Simon and Schuster
Page : 331 pages
File Size : 42,9 Mb
Release : 2016-04-15
Category : Computers
ISBN : 9781638353324

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Re-Engineering Legacy Software by Chris Birchall Pdf

Summary As a developer, you may inherit projects built on existing codebases with design patterns, usage assumptions, infrastructure, and tooling from another time and another team. Fortunately, there are ways to breathe new life into legacy projects so you can maintain, improve, and scale them without fighting their limitations. Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications. About the Book Re-Engineering Legacy Software is an experience-driven guide to revitalizing inherited projects. It covers refactoring, quality metrics, toolchain and workflow, continuous integration, infrastructure automation, and organizational culture. You'll learn techniques for introducing dependency injection for code modularity, quantitatively measuring quality, and automating infrastructure. You'll also develop practical processes for deciding whether to rewrite or refactor, organizing teams, and convincing management that quality matters. Core topics include deciphering and modularizing awkward code structures, integrating and automating tests, replacing outdated build systems, and using tools like Vagrant and Ansible for infrastructure automation. What's Inside Refactoring legacy codebases Continuous inspection and integration Automating legacy infrastructure New tests for old code Modularizing monolithic projects About the Reader This book is written for developers and team leads comfortable with an OO language like Java or C#. About the Author Chris Birchall is a senior developer at the Guardian in London, working on the back-end services that power the website. Table of Contents PART 1 GETTING STARTED Understanding the challenges of legacy projects Finding your starting point PART 2 REFACTORING TO IMPROVE THE CODEBASE Preparing to refactor Refactoring Re-architecting The Big Rewrite PART 3 BEYOND REFACTORING—IMPROVING PROJECT WORKFLOWAND INFRASTRUCTURE Automating the development environment Extending automation to test, staging, and production environments Modernizing the development, building, and deployment of legacy software Stop writing legacy code!

Author : Robert C. Seacord,Daniel Plakosh,Grace A. Lewis
Publisher : Addison-Wesley Professional
Page : 344 pages
File Size : 46,8 Mb
Release : 2003
Category : Electronic books
ISBN : 0321118847

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Modernizing Legacy Systems by Robert C. Seacord,Daniel Plakosh,Grace A. Lewis Pdf

Most organizations rely on complex enterprise information systems (EISs) to codify their business practices and collect, process, and analyze business data. These EISs are large, heterogeneous, distributed, constantly evolving, dynamic, long-lived, and mission critical. In other words, they are a complicated system of systems. As features are added to an EIS, new technologies and components are selected and integrated. In many ways, these information systems are to an enterprise what a brain is to the higher species--a complex, poorly understood mass upon which the organism relies for its very existence. To optimize business value, these large, complex systems must be modernized--but where does one begin? This book uses an extensive real-world case study (based on the modernization of a thirty year old retail system) to show how modernizing legacy systems can deliver significant business value to any organization.

Author : Marianne Bellotti
Publisher : No Starch Press
Page : 250 pages
File Size : 50,7 Mb
Release : 2021-03-17
Category : Computers
ISBN : 9781718501188

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Kill It with Fire by Marianne Bellotti Pdf

Kill It with Fire chronicles the challenges of dealing with aging computer systems, along with sound modernization strategies. How to survive a legacy apocalypse “Kill it with fire,” the typical first reaction to a legacy system falling into obsolescence, is a knee-jerk approach that often burns through tons of money and time only to result in a less efficient solution. This book offers a far more forgiving modernization framework, laying out smart value-add strategies and proven techniques that work equally well for ancient systems and brand-new ones. Renowned for restoring some of the world’s oldest, messiest computer networks to operational excellence, software engineering expert Marianne Bellotti distills key lessons and insights from her experience into practical, research-backed guidance to help you determine when and how to modernize. With witty, engaging prose, Bellotti explains why new doesn’t always mean better, weaving in illuminating case studies and anecdotes from her work in the field. You’ll learn: Where to focus your maintenance efforts for maximum impact and value How to pick the right modernization solutions for your specific needs and keep your plans on track How to assess whether your migrations will add value before you invest in them What to consider before moving data to the cloud How to determine when a project is finished Packed with resources, exercises, and flexible frameworks for organizations of all ages and sizes, Kill It with Fire will give you a vested interest in your technology’s future.

Author : William M. Ulrich
Publisher : Unknown
Page : 456 pages
File Size : 52,5 Mb
Release : 2002
Category : Computers
ISBN : UOM:39015054461515

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Legacy Systems by William M. Ulrich Pdf

In Legacy Systems: Transformation Strategies, leading IT and business architecture consultant William Ulrich presents a step-by-step, phased roadmap to legacy transformation that maximizes business value, while minimizing cost, disruption, and risk. Transformation strategies, organizing disciplines, techniques, and tools reduce the risks of deploying the component-based architectures you need to stay competitive while maximizing the business value of core systems that work.

Author : Carmen Zannier,Hakan Erdogmus,Lowell Lindstrom
Publisher : Springer Science & Business Media
Page : 246 pages
File Size : 49,7 Mb
Release : 2004-08-03
Category : Computers
ISBN : 9783540228394

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Extreme Programming and Agile Methods - XP/Agile Universe 2004 by Carmen Zannier,Hakan Erdogmus,Lowell Lindstrom Pdf

This book constitutes the refereed proceedings of the 4th Conference on Extreme Programming and Agile Methods, XP/Agile Universe 2004, held in Calgary, Canada in August 2004. The 18 revised full papers presented together with summaries of workshops, panels, and tutorials were carefully reviewed and selected from 45 submissions. The papers are organized in topical sections on testing and integration, managing requirements and usability, pair programming, foundations of agility, process adaptation, and educational issues.

Author : Christian Wagner
Publisher : Springer Science & Business Media
Page : 319 pages
File Size : 54,5 Mb
Release : 2014-03-10
Category : Computers
ISBN : 9783658052706

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Model-Driven Software Migration: A Methodology by Christian Wagner Pdf

Today, reliable software systems are the basis of any business or company. The continuous further development of those systems is the central component in software evolution. It requires a huge amount of time- man power- as well as financial resources. The challenges are size, seniority and heterogeneity of those software systems. Christian Wagner addresses software evolution: the inherent problems and uncertainties in the process. He presents a model-driven method which leads to a synchronization between source code and design. As a result the model layer will be the central part in further evolution and source code becomes a by-product. For the first time a model-driven procedure for maintenance and migration of software systems is described. The procedure is composed of a model-driven reengineering and a model-driven migration phase. The application and effectiveness of the procedure are confirmed with a reference implementation applied to four exemplary systems.

Author : Adam Tornhill
Publisher : Pragmatic Bookshelf
Page : 362 pages
File Size : 52,8 Mb
Release : 2018-03-08
Category : Computers
ISBN : 9781680505801

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Software Design X-Rays by Adam Tornhill Pdf

Are you working on a codebase where cost overruns, death marches, and heroic fights with legacy code monsters are the norm? Battle these adversaries with novel ways to identify and prioritize technical debt, based on behavioral data from how developers work with code. And that's just for starters. Because good code involves social design, as well as technical design, you can find surprising dependencies between people and code to resolve coordination bottlenecks among teams. Best of all, the techniques build on behavioral data that you already have: your version-control system. Join the fight for better code! Use statistics and data science to uncover both problematic code and the behavioral patterns of the developers who build your software. This combination gives you insights you can't get from the code alone. Use these insights to prioritize refactoring needs, measure their effect, find implicit dependencies between different modules, and automatically create knowledge maps of your system based on actual code contributions. In a radical, much-needed change from common practice, guide organizational decisions with objective data by measuring how well your development teams align with the software architecture. Discover a comprehensive set of practical analysis techniques based on version-control data, where each point is illustrated with a case study from a real-world codebase. Because the techniques are language neutral, you can apply them to your own code no matter what programming language you use. Guide organizational decisions with objective data by measuring how well your development teams align with the software architecture. Apply research findings from social psychology to software development, ensuring you get the tools you need to coach your organization towards better code. If you're an experienced programmer, software architect, or technical manager, you'll get a new perspective that will change how you work with code. What You Need: You don't have to install anything to follow along in the book. TThe case studies in the book use well-known open source projects hosted on GitHub. You'll use CodeScene, a free software analysis tool for open source projects, for the case studies. We also discuss alternative tooling options where they exist.

Author : Suzanne Methot
Publisher : ECW Press
Page : 257 pages
File Size : 45,8 Mb
Release : 2019-03-19
Category : Social Science
ISBN : 9781773052960

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Legacy by Suzanne Methot Pdf

Five hundred years of colonization have taken an incalculable toll on the Indigenous peoples of the Americas: substance use disorders and shockingly high rates of depression, diabetes, and other chronic health conditions brought on by genocide and colonial control. With passionate logic and chillingly clear prose, author and educator Suzanne Methot uses history, human development, and her own and others’ stories to trace the roots of Indigenous cultural dislocation and community breakdown in an original and provocative examination of the long-term effects of colonization. But all is not lost. Methot also shows how we can come back from this with Indigenous ways of knowing lighting the way.

Author : Jesper Hoffmeyer
Publisher : Springer Science & Business Media
Page : 292 pages
File Size : 42,5 Mb
Release : 2008-02-01
Category : Science
ISBN : 9781402067068

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A Legacy for Living Systems by Jesper Hoffmeyer Pdf

Gregory Bateson’s contribution to 20th century thinking has appealed to scholars from a wide range of fields dealing in one way or another with aspects of communication and epistemology. A number of his insights were taken up and developed further in anthropology, psychology, evolutionary biology and communication theory. But the large, trans-disciplinary synthesis that, in his own mind, was his major contribution to science received little attention from the mainstream scientific communities. This book represents a major attempt to revise this deficiency. Scholars from ecology, biochemistry, evolutionary biology, cognitive science, anthropology and philosophy discuss how Bateson's thinking might lead to a fruitful reframing of central problems in modern science. Most important perhaps, Bateson's bioanthropology is shown to play a key role in developing the set of ideas explored in the new field of biosemiotics. The idea that organismic life is indeed basically semiotic or communicative lies at the heart of the biosemiotic approach to the study of life. The only book of its kind, this volume provides a key resource for the quickly-growing substratum of scholars in the biosciences, philosophy and medicine who are seeking an elegant new approach to exploring highly complex systems.

Author : Lucas Carlson
Publisher : "O'Reilly Media, Inc."
Page : 144 pages
File Size : 53,9 Mb
Release : 2013-07-31
Category : Computers
ISBN : 9781449335120

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Programming for PaaS by Lucas Carlson Pdf

Platform-as-a-Service (PaaS) is gaining serious traction among web and mobile developers, but as new PaaS providers emerge and existing vendors upgrade their features, it’s hard to keep track of what PaaS has to offer. This thorough introduction takes you through the PaaS model from a developer’s point of view, and breaks down the types of services that Google App Engine, Windows Azure, Heroku, Cloud Foundry, and others deliver. Whether you’re an entrepreneur or part of a large enterprise development team, this book shows you how PaaS can help you focus on innovative applications, rather than spend your time worrying about technical operations. Track the cloud’s evolution from IaaS and DevOps to PaaS Learn how PaaS combines the simplicity of shared web hosting with the control of dedicated hosting Explore the benefits of both portable and non-portable PaaS options Apply best practices for moving legacy apps to PaaS—and understand the challenges involved Write new applications for PaaS from scratch with RESTful meta-services Use PaaS to build mobile apps with backend services that scale Examine the core services that each major provider currently offers Learn the situations in which PaaS might not be advantageous

Author : John Ousterhout
Publisher : Yaknyam Publishing
Page : 128 pages
File Size : 46,9 Mb
Release : 2018-04-10
Category : Electronic
ISBN : 1732102201

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A Philosophy of Software Design by John Ousterhout Pdf

Author : Martin Fowler,Kent Beck
Publisher : Addison-Wesley Professional
Page : 461 pages
File Size : 42,8 Mb
Release : 1999
Category : Computers
ISBN : 9780201485677

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Refactoring by Martin Fowler,Kent Beck Pdf

Refactoring is gaining momentum amongst the object oriented programming community. It can transform the internal dynamics of applications and has the capacity to transform bad code into good code. This book offers an introduction to refactoring.

Author : Niall Richard Murphy,Betsy Beyer,Chris Jones,Jennifer Petoff
Publisher : "O'Reilly Media, Inc."
Page : 552 pages
File Size : 50,6 Mb
Release : 2016-03-23
Category : Electronic
ISBN : 9781491951170

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Site Reliability Engineering by Niall Richard Murphy,Betsy Beyer,Chris Jones,Jennifer Petoff Pdf

The overwhelming majority of a software system’s lifespan is spent in use, not in design or implementation. So, why does conventional wisdom insist that software engineers focus primarily on the design and development of large-scale computing systems? In this collection of essays and articles, key members of Google’s Site Reliability Team explain how and why their commitment to the entire lifecycle has enabled the company to successfully build, deploy, monitor, and maintain some of the largest software systems in the world. You’ll learn the principles and practices that enable Google engineers to make systems more scalable, reliable, and efficient—lessons directly applicable to your organization. This book is divided into four sections: Introduction—Learn what site reliability engineering is and why it differs from conventional IT industry practices Principles—Examine the patterns, behaviors, and areas of concern that influence the work of a site reliability engineer (SRE) Practices—Understand the theory and practice of an SRE’s day-to-day work: building and operating large distributed computing systems Management—Explore Google's best practices for training, communication, and meetings that your organization can use