Modernizing Legacy Systems
DOWNLOAD eBooks
Download Modernizing Legacy Systems PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Modernizing Legacy Systems book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Modernizing Legacy Systems
DOWNLOAD eBooks
Author : Robert C. Seacord
language : en
Publisher: Addison-Wesley Professional
Release Date : 2003
Modernizing Legacy Systems written by Robert C. Seacord and has been published by Addison-Wesley Professional this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Electronic books categories.
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.
A Survey Of Legacy System Modernization Approaches
DOWNLOAD eBooks
Author :
language : en
Publisher:
Release Date : 2000
A Survey Of Legacy System Modernization Approaches written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Computer software categories.
Abstract: "Information systems are critical assets for modern enterprises and incorporate key knowledge acquired over the life of an organization. Although these systems must be updated continuously to reflect evolving business practices, repeated modification has a cumulative effect on system complexity, and the rapid evolution of technology quickly renders existing technologies obsolete. Eventually, the existing information systems become too fragile to modify and too important to discard. However, organizations must consider modernizing these legacy systems to remain viable. The commercial market provides a variety of solutions to this increasingly common problem of legacy system modernization. However, understanding the strengths and weaknesses of each modernization technique is paramount to select the correct solution and the overall success of a modernization effort. This paper provides a survey of modernization techniques including screen scraping, database gateway, XML integration, database replication, CGI integration, object-oriented wrapping, and 'componentization' of legacy systems. This general overview enables engineers performing legacy system modernization to preselect a subset of applicable modernization techniques for further evaluation."
Modernizing Legacy Applications In Php
DOWNLOAD eBooks
Author : Paul M. Jones
language : en
Publisher: Packt Publishing Ltd
Release Date : 2016-08-31
Modernizing Legacy Applications In Php written by Paul M. Jones and has been published by Packt Publishing Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-08-31 with Computers categories.
Get your code under control in a series of small, specific steps About This Book Learn to extract and replace legacy artifacts, Improve your application from the ground up while keeping your codebase fully operational, Improve the quality of your legacy applications. Who This Book Is For PHP developers from all skill levels will be able to get value from this book and will be able to transform their spaghetti code applications to clean, modular applications. If you are in the midst of a legacy refactor or you find yourself in a state of despair caused by the code you have inherited, this is the book for you. All you need is to have PHP 5.0 installed, and you're all set to change the way you maintain and deploy your code! What You Will Learn Replace global and new with dependency injection Extract SQL statements to gateways Convert action logic to controllers Remove repeated logic in page scripts Create maintainable PHP code from crufty legacy PHP In Detail Have you noticed that your legacy PHP application is composed of page scripts placed directly in the document root of the web server? Or, do your page scripts, along with any other classes and functions, combine the concerns of model, view, and controller into the same scope? Is the majority of the logical flow incorporated as include files and global functions rather than class methods? Working with such a legacy application feels like dragging your feet through mud, doesn't it?This book will show you how to modernize your application in terms of practice and technique, rather than in terms of using tools like frameworks and libraries, by extracting and replacing its legacy artifacts. We will use a step-by-step approach, moving slowly and methodically, to improve your application from the ground up. We'll show you how dependency injection can replace both the new and global dependencies. We'll also show you how to change the presentation logic to view files and the action logic to a controller. Moreover, we'll keep your application running the whole time. Each completed step in the process will keep your codebase fully operational with higher quality. When we are done, you will be able to breeze through your code like the wind. Your code will be autoloaded, dependency-injected, unit-tested, layer-separated, and front-controlled. Most of the very limited code we will add to your application is specific to this book. We will be improving ourselves as programmers, as well as improving the quality of our legacy application. Style and approach This book gives developers an easy-to-follow, practical and powerful process to bring their applications up to a modern baseline. Each step in the book is practical, self-contained and moves you closer to the end goal you seek: maintainable code. As you follow the exercises in the book, the author almost anticipates your questions and you will have the answers, ready to be implemented on your project.
Modernizing Legacy Applications To Microsoft Azure
DOWNLOAD eBooks
Author : Steve Read and Larry Mead
language : en
Publisher: Packt Publishing Ltd
Release Date :
Modernizing Legacy Applications To Microsoft Azure written by Steve Read and Larry Mead and has been published by Packt Publishing Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Information Systems Transformation
DOWNLOAD eBooks
Author : William M. Ulrich
language : en
Publisher: Morgan Kaufmann
Release Date : 2010-02-04
Information Systems Transformation written by William M. Ulrich and has been published by Morgan Kaufmann this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-02-04 with Computers categories.
Every major enterprise has a significant installed base of existing software systems that reflect the tangled IT architectures that result from decades of patches and failed replacements. Most of these systems were designed to support business architectures that have changed dramatically. At best, these systems hinder agility and competitiveness and, at worst, can bring critical business functions to a halt. Architecture-Driven Modernization (ADM) restores the value of entrenched systems by capturing and retooling various aspects of existing application environments, allowing old infrastructures to deliver renewed value and align effectively with enterprise strategies and business architectures. Information Systems Transformation provides a practical guide to organizations seeking ways to understand and leverage existing systems as part of their information management strategies. It includes an introduction to ADM disciplines, tools, and standards as well as a series of scenarios outlining how ADM is applied to various initiatives. Drawing upon lessons learned from real modernization projects, it distills the theory and explains principles, processes, and best practices for every industry. Acts as a one-stop shopping reference and complete guide for implementing various modernization models in myriad industries and departments Every concept is illustrated with real-life examples from various modernization projects, allowing you to immediately apply tested solutions and see results Authored by the Co-chair of the Object Management Group (OMG) Architecture-Driven Modernization (ADM) Task Force, which sets definitive systems modernization standards for the entire IT industry A web site supports the book with up to date coverage of evolving ADM Specifications, Tutorials, and Whitepapers, allowing you to remain up to date on modernization topics as they develop
Kill It With Fire
DOWNLOAD eBooks
Author : Marianne Bellotti
language : en
Publisher: No Starch Press
Release Date : 2021-03-17
Kill It With Fire written by Marianne Bellotti and has been published by No Starch Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-17 with Computers categories.
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.
Legacy System Wrapping For Department Of Defense Information System Modernization
DOWNLOAD eBooks
Author :
language : en
Publisher:
Release Date : 1995
Legacy System Wrapping For Department Of Defense Information System Modernization written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
This document explains the activities, benefits, problems, and issues in using the object-oriented technique of software wrapping to support the migration from legacy information systems to modernized systems. DoD legacy systems have obsolete technologies such as closed systems, stovepipe design, and outmoded programming languages or database systems. Software wrapping is used to create an interface around data, individual modules, subsystems, or whole systems, allowing access to the entities in the original system. Examples of wrapping implementation and guidelines, using the Ada programming language (Ada 83), are given for functions or subprograms originally written in the Cobol, C, Fortran, and Assembler. In addition, software wrapping is analyzed in the broader context of alternative migration strategies for a whole system. The unite-and-conquer strategy appears to be better suited to software wrapping, using a unified object model throughout progressive stages of migration, as compared to the other three strategies (divide-and-conquer, divide-and-wrap, one-short-rebuild).
Working With Legacy Systems
DOWNLOAD eBooks
Author : Robert Annett
language : en
Publisher: Packt Publishing Ltd
Release Date : 2019-06-03
Working With Legacy Systems written by Robert Annett and has been published by Packt Publishing Ltd this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-06-03 with Computers categories.
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.
Encapsulating Legacy
DOWNLOAD eBooks
Author : Isaac Nangan
language : en
Publisher: Mainframes
Release Date : 2024-01-22
Encapsulating Legacy written by Isaac Nangan and has been published by Mainframes this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-01-22 with Computers categories.
Welcome to "Encapsulating Legacy: A Guide to Service-Oriented Architecture in Mainframe Systems". This book is a comprehensive exploration of the intersection between the enduring world of mainframe computing and the dynamic landscape of service-oriented architecture (SOA). It is intended for IT professionals, systems architects, and decision-makers who are navigating the challenging yet essential path of modernizing legacy mainframe systems. The journey of mainframe modernization is not merely a technological upgrade; it's a strategic transformation that affects every facet of an organization's IT infrastructure. This book aims to demystify the process and principles of integrating SOA into mainframe environments, addressing both the technical and strategic aspects of such an endeavor. In the following chapters, we delve into the fundamentals of SOA, its relevance to mainframes, and the practical steps involved in implementing this architecture in a mainframe context. We cover a range of topics from assessing your current infrastructure, planning, and executing the migration, to managing the new environment effectively. Additionally, we explore the critical aspects of security, compliance, and quality assurance in these modernized systems. Real-world case studies are included to provide insights into successful implementations and the lessons learned from them. We believe these stories will not only inform but also inspire you as you embark on or continue your journey in mainframe modernization. As you turn the pages, we hope you find this book to be both a valuable guide and a source of inspiration. The path to modernizing mainframes with SOA is complex and challenging, but with the right approach and understanding, it can lead to significant benefits for your organization. We wish you success on your journey towards encapsulating your legacy systems into a more flexible, efficient, and future-ready IT landscape.
Legacy Systems
DOWNLOAD eBooks
Author : William M. Ulrich
language : en
Publisher:
Release Date : 2002
Legacy Systems written by William M. Ulrich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Computers categories.
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.