Improving the design of existing code by martin fowler. Code refactoring the art of safely improving the design of existing code fowler09 implications. Introduction to object oriented abap, concepts and principles of object oriented abap programming. Without refactoring you accrue technical debt, forget what portions of code do and create code that is resistant to any form of testing. Potential advantages of refactoring may include improved code readability.
Introduction to refactoring refactoring refactoring is. This book is a whole abap teaching course and has been written with your complete novice, sap largeshopper and advisor in ideas. Epub, mobi, pdf, online isbn 9781592298488 1059 pages, 2nd, updated and revised edition 2007, print edition. Abap objects examples abap development community wiki. Much of refactoring is devoted to correctly composing methods. Moving of elements attributes from a method to the public section or. Unfortunately both are not supported by the abap refactoring browser. Objectoriented design with abap presents a bridge from the familiar procedural style of abap to the unfamiliar objectoriented style, taking you by the hand and leading you through the difficulties associated with learning these concepts, covering not only the nuances of using objectoriented principles in abap software design but also revealing the reasons why these concepts have become. Jan 09, 2014 object oriented abap is taking slow phase in adoption for pure abapersnot working in webdynpro or other object oriented space. But we have to do it manually, it would be too costly and tedious task.
Classical way to abap oo style of coding sap blogs. Objectoriented programming in abap objects amazon s3. Data and functions were kept separate and linked together by means of input and output relations. Significant numbers of poorly designed programs have been created by lessexperienced developers, resulting in applications that are inefficient and hard to maintain and extend. Association can be achieved by declaring an attribute using type ref to object. Throughout this series we will look at oo terminology, development tools, and design patterns that span a variety of abap release levels. The abap workbench has many tools and features that cannot be limited to 100 tips. Nov 18, 2016 learn how to use refactoring capabilities for your source code in abap development tools. Today refactoring requires considerable design knowhow, but once tools become available, all programmers should be able to improve their code using refactoring techniques. Abap refactoring class computer programming subroutine. However abap creates a byte code that is interpreted by the abap virtual machine actually a lot like the way java works.
Refactoring is not just any restructuring intended to improve the code refactoring. Even i was in a situation when one of my clients questioned, why you code in oo as he was not able to understand. A new perspective on objectoriented design, 2nd edition, alan shalloway suggests that the term god program stems from the fact. The objectoriented approach, however, focuses on objects that represent abstract or concrete things of the real world. Moving components from class to associated class refactoring assistant also helps up when we dont have the class. Creating a method in sap classes using object oriented abap programming. Association is a reference of an object to another object. When i started writing abap classes in the first place i was not aware that the se80 has a refactoring browser, too. The objectoriented programming model lesson overview based on your existing knowledge of procedural programming with abap, we will explain the objectoriented approach and encourage you.
Even if that had been correct, the paper is of the cheapest possible quality which means you can see the text of the next page through the page you are reading, something that makes reading source code, where punctuation really matters, much more difficult. Tips that are included in the book are selected from the wide range of topics mostly to give you workarounds to perform your daily tasks in a more efficient way. Download design patterns in objectoriented abap pdf ebook. Learn how to achieve it with test driven development for abap programs. These techniques may feel foreign at first, but in the long run they lead to code that is easier and safer to maintain. Thanks to explanations of basic concepts and practical examples, youll find answers to questions you didnt even know you had.
Fowler in their seminal refactoring book, refactoring. Domi sap bopf domi bigl senior consultant at cadaxo. Summarizes the changes between the first and second editions. Sep 20, 2011 class editor refactoring assistant ii continuing exploring the refactoring assistant, well see how we can use the class association in the refactoring assistant. Refactoring reduces your riskcan lead to lightweight pragmatic design 11 whats refactoring again.
It explains the wheres and whyfors along the way so that you can really grasp the new concepts. In my experience, there is little difference between testing global and local classes. Objectoriented programming with abap objects sap press. If youre ready to leap into the world of objectoriented programming oop and abap objectsor are already there and just need a refresherthen this is the book youve been looking for. They are stored centrally in class pools in the class library in the r3 repository. Objects object is an real time entity in the world. Dec 10, 2015 the paper explains code refactoring techniques based on code examples written in abap objects languageview this document. Oo abap dynpro programming abap oo mixed with classic dynpro.
Elements of reusable objectoriented software 7 preface to book this book isnt an introduction to objectoriented technology or design. In the past, information systems used to be defined primarily by their functionality. Moving components from class to associated class refactoring assistant also helps up when we dont have the class hierarchy but the class association. In most cases, excessively long methods are the root of all evil. The refactoring tales is a set of refactoring stories grouped read pdfs aloud iphone into a small book. One day i accidently opened the massive right mouse button menu in the se80. The use for any commercial purpose other than promoting the book is strictly prohibited.
The objectoriented programming model lesson overview based on your existing knowledge of procedural programming with abap, we will explain the objectoriented approach and encourage you to use it. I have seen many blogs on abap oo which will be a good start for learning. Epub, mobi, pdf, online isbn 9781592298488 1059 pages. Prior to this the prevailing wisdom was if it aint broke dont fix it, and whilst this is still a sensible principle in general most programmers. Learn how to use refactoring capabilities for your source code in abap development tools. The refactoring techniques in this group streamline methods, remove. Working with object oriented techniques to develop alv. Basic knowledge of objectoriented programming bc401 or equivalent course based on software release ecc6. This enables you to use new techniques based on abap objects, such as new interfaces, without the need to completely rewrite your existing code. Programming techniques may include features such as encapsulation, modularity, polymorphism, and inheritance. Working with events and event handler methods in sap classes in sap abap programming model. This book assumes you are reasonably proficient in at least one objectoriented programming language, and you should have some. The ideal would be for changes made during the implementation phase to flow back into the design automatically. Jul 01, 2009 abap doesnt really compile down to c code.
Refactoring does not include any change to the system. Art of improving the design of existing code a process of changing a software system in such a way that it does not alter the external behavior of the code yet improves its internal structuremartin fowler in his refactoring book 12. It is not intended to be an standalone substitution of the book so if you really want to learn the concepts here presented, buy and read the book and use this repository as a reference and guide. If youre looking for a free download links of design patterns in objectoriented abap pdf, epub, docx and torrent then this site is not for you. Refactoring assistant in abap class more details converting local classes to.
The paper explains code refactoring techniques based on code examples written in abap objects languageview this document. Whether or not or not you are merely starting your career in sap or are working as a helpful advisor, system assist analyst, enterprise advisor, problem supervisor or one factor solely completely totally different. Print edition hardcover isbn 9781592290796 1059 pages, 2nd, updated and revised edition 2007 ebook formats. This week we begin a 5 part series based upon a frequent request to look at basic abap object oriented concepts. Addison wesley will publish the read the hunger games pdf book in. Each topic should be relevant to handson technical leaders, particularly in enterprise applications. Improving the design of existing code shows how refactoring can make objectoriented code simpler and easier to maintain.
Developing alv using ooabap lesson description working with object oriented techniques to develop alv reports in sap abap, develop alv reports with object oriented approach. Jan 10, 2016 this is part 2 of the 5 part series on abap oo. If youre ready to leap into the world of objectoriented programming oop and abap objects or are already there and just need a refresher then this is the book youve been looking for. Some tips in the book require expertlevel knowledge, and some can be very. Sap ooabap interview questions and answers, best object oriented abap interview questions, sap abap oops, oops abap. The vagaries of code inside these methods conceal the execution logic and make the method extremely hard to understand and even harder to change. Improving the design of existing code, addisonwesley, 1999. Global classes and interfaces are defined in the class builder transaction se24 in the abap workbench. Class editor refactoring assistant i abap help blog. What is sap class builder and introduction to transaction se24 in sap. Bonn boston horst keller, sascha kruger abap objects abap programming in sap netweaver. Class a class is a template of objects which can handle more than one characteristics. The abap unit framework doesnt require that the code under test is oo, but if you want to test effectively and isolate the code you are testing keywords.
When i started writing abap classes in the first place i was not aware that the se80 has a refactoring browser. The guide to how to transform code with safe and rapid process, vital to keeping it cheap and easy to modify for future needs. In this part we will expand the lesson by looking at static vs. The refactoring tales is a set of refactoring stories grouped read pdfs aloud iphone into a. This book arrived this morning and i was disappointed. Understanding code smells in android applications uci ics. Classes in abap objects can be declared either globally or locally. The ideal would be for changes made during the implementation phase. All of the abap programs in an r3 system can access the global classes. Department of computer science university of illinois at urbanachampaign, 1992 ralph e.
Consistent with all books on objectoriented programming languages, the pres entation of the abap language in chapter 4 begins this time with. As you can see there are a lot refactorings possible. Working with singleton design patterns in object oriented abap, singleton class in ooabap. Code refactoring is the process of restructuring existing computer codechanging the factoringwithout changing its external behavior. The software that comes along with the book, does not work with. Abap in eclipse tutorials refactoring capabilities youtube. The abap runtime support for both procedural and abap objects programming models enables you to use abap objects in any program. Thanks to explanations of basic concepts and practical examples, youll find answers to. Aggregation one class using the instances on other class is know as aggregation. Sep 21, 2011 refactoring assistant also helps up when we dont have the class hierarchy but the class association. While designing a application, a lot of instances that we need to move methods, attributes, events or types from a class to another class or an interface.
The heart of the book is a catalog of refactorings, organized in chapters on composing methods. Existing code shows how refactoring can make objectoriented code simpler and easier to maintain. Core abap advanced abap bdc bapi aleidocs data dictionary sap data migration object oriented abap performance tuning coding standards floor plan managerfpm workflow sap enterprise search webdynpro for abap sap materials management. Today refactoring requires considerable design knowhow, but once tools become available, all programmers should be able. Objectoriented programming oop is a programming paradigm that uses objects and their interactions to design applications and computer programs. Oct 14, 2005 unfortunately both are not supported by the abap refactoring browser. This is the book that introduced the concept of refactoring to the wider software engineering community. Each book should be an excellent, indepth coverage of its topic. Association relating two classes or relation between two classes is called as association. Consistency throughout the software development process the language used in the various phases of software development analysis, specification, design and implementation is uniform. As the application of object technologyparticularly the java programming languagehas become commonplace, a new problem has emerged to confront the software development community. For more information, reference our print and ebook bulk sales web page at. Sap abap uses numerous hands on business oriented use cases and a valuable dedicated eresource to demonstrate the underlying advanced concepts of the oo abap environment and the sap ui. Contrary to popular belief, many core objectoriented programming concepts are based on.
A refactoring is a change to the structure of code that does not change its functionality. Of friends in abap classes more details creating table of references to. Pdf 9 mb, epub 6 mb, and mobi 25 mb file for download, drm free with. Of this book is to learn stepbystep basics of saps programming language. Modern abap abap objects instanzen datenkapselung interfaces abstrakten klassen vererbung exceptions ausnahmeklassen events adt refactoring support objectoriented programming p 48. Refactoring is intended to improve the design, structure, andor implementation of the software its nonfunctional attributes, while preserving the functionality of the software. Class editor refactoring assistant ii continuing exploring the refactoring assistant, well see how we can use the class association in the refactoring assistant.