Each transformation called a refactoring does little, but a sequence of these transformations can produce a significant restructuring. Software risk management plan after cataloging risks according to type technical, project, process, organizational, the software development project manager crafts a plan to record and monitor these risks. Refactoring is the controllable process of systematically improving your code without writing new functionality. Abstractthis paper provides an extensive overview of existing research in the field of software refactoring. Refactoring is one of the most important and commonly used techniques of transforming a piece of software in order to improve its quality. Refactoring a software system means to refurbish it internally without interfering with its external properties. Examples of refactoring php code for better readability. Instead of duplicating the code across two different classes, you could create an abstract class which holds the common functionality and then make the other two classes extend the abstract class. For example, when we view primitive obsession as violation of abstraction, the natural refactoring is to apply the principle of abstraction and create an abstraction. Software engineering project report a sample document for generating consistent professional reports prepared by john t.
We report the result of an empirical study of nsgaii technique applied to eight open. A short example how to use the typehinting features of php and write better code. Refactoring either exposes those simpler components or reduces them to the more efficient complex expression depending on which way you are going. The joy of code refactoring berkeley institute for data science. I feel teaching when to refactor really depends on the company you are currently in. Making software refactorings safer anna maria eilertsen. An example of preparatory refactoring martin fowler. A running example is used throughout the paper to explain and illustrate the main concepts. Refactoring is the process of taking an object design and rearranging it in various ways to make the design more flexible andor reusable.
Improving the design of existing code shows how refactoring can make objectoriented code simpler and easier to maintain. The study of green grass is popular among agrostologists. Report from dagstuhl seminar 12071 software clone management towards industrial application editedby rainer koschke1, ira d. The dagstuhl seminar on the future of refactoring brought together 41 researchers and practitioners from academia and industry working on different aspects of refactoring. All code examples and refactoring definitions, as well as our implementation. Today refactoring requires considerable design knowhow, but once tools become available, all programmers should be able to improve their code using refactoring techniques. Refactoring is the 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 structure. Keshta department of computer engineering king fahd university of petroleum and minerals dhahran, saudi arabia abstractthe objective of software refactoring is to improve the software products quality by improving its performance and understandability. The rules are merely manifestations of these basic principles. In this paper, we examine software refactoring research papers published.
Code refactoring techniques in agile software development. Code refactoring is a disciplined way to restructure code, undertaken in order to improve some of the nonfunctional attributes of the software. In the words of martin fowler, the father of the code smell notion, refactoring is the process of changing a software system to improve its internal structure without altering. Refactoring is a technique to improve the quality of existing code. Refactoring seminar report and ppt for cse students. Refactoring doesnt change the observable behavior of the software. Cleaning up code so that it minimizes chances of bugs improving design of code after it is written. Explore computer sciencecse seminar topics with abstract, computer science cse engineering and technology seminar topics, latest cse mca it seminar papers 2015 2016, recent essay topics, speech ideas, dissertation, thesis, ieee and mca seminar topics, reports, synopsis, advantanges, disadvantages, abstracts, presentation pdf, doc and ppt for final year be, btech, mtech, msc, bsc, mca and. Also explore the seminar topics paper on refactoring with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year computer science engineering or cse students for the year 2015 2016. Software engineering conference esec and the acm sigsoft sympo. It has grown to more than 50 million loc over the last 25 years. The example demonstrates the process of refactoring and several specific refactorings that one typically encounters in the process of refactoring code. Incurs a shortterm timework cost to reap longterm benefits a longterm investment in the overall quality of your system.
Improving a piece of softwares internal structure without altering its external behavior. Apr 20, 2016 a good example of this is when two different but similar classes require some of the same functionality. The refactoring is applied to a given set of program elements, for example all methods or. These refactoring techniques show how to safely move functionality between classes, create new classes, and hide implementation details from public access. In a bigger software development company where time is money, it may be to just start designing with the better practices you learned from this point forward, do not worry about refactoring until verison 2 of that specific software. My example is the windows form application, whose main form looks like this. There are two purposes of a report that is done in formal writing and these are on information and communication. This paper introduces the use of a neural networkbased fitness function for the. The goal of refactoring is to pay off technical debt. Code refactoring is one of the key terms in software development and today i would like to talk about code refactoring techniques that might increase your efficiency. Every episode of preparatory refactoring is different. Explore refactoring with free download of seminar report and ppt in pdf and doc format. Refactoring is intended to improve the design, structure, andor implementation of the software its nonfunctional attributes, while preserving the functionality of the software.
Software refactoring is a form of code modification, used to improve the software structure in support of subsequent extension and longterm maintenance. A case study on the impact of refactoring on quality and. It works by applying a series of small steps, each of which changes the internal structure of the code, while maintaining its external behavior. In addition to such valuable approach, the energy es efficiency as a new software quality factor, should be considered in those refactoring techniques. In most cases, the goal is to transform code without impacting correctness. Refactoring is changing a software system in such a way that it addresses nonfunctional requirements e. Refactoring has grown into a wellknown technique, and most software development teams at least claim to be doing refactoring regularly. Newest refactoring questions software engineering stack. Dive into refactoring teaches you how to properly deal with legacy code, how to identify ugly code and how to clean it safely. Basically, code refactoring is the process of changing a programs source code without modifying its external functional.
Aug 31, 2012 the rules are merely manifestations of these basic principles. Software engineering project university of illinois at. Templatebased reconstruction of complex refactorings citeseerx. As he comes back to work next week i will share a small example how to refactor the code here, so i wont forget to mention it to him. Investigation for software power consumption of code. Refactoring improves the design of software without refactoring, a design will decay as people make changes to a software system refactoring makes software easier to understand because structure is improved, duplicated code is eliminated, etc. A refactoring code browser for java final report imperial. I am a new hire out of university at a large software company tasked with either refactoring or rewriting a large legacy method 500 lines, 2000 lines expanded with private method calls. By paul kimelman, february 01, 2002 in pauls inaugural column, he steps through a refactoring example that demonstrates how this facet of extreme programming can help refine large, complex systems. Bell for use in cs 440 at the university of illinois chicago september 20. In this article, we explain the elements of an effective software risk management plan and provide examples of plan elements. Refactoring has been described as the art of safely improving the design of existing code martin fowler, see refs.
Even if you have distributed functionality among different classes in a lessthanperfect way, there is still hope. Coding horrors and remedies course of software engineering ii a. Trends, opportunities and challenges of software refactoring. In the refactoring book, i passed on kents metaphor of the two hats. Refactoring is the 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 structure. While you may be asked to write on a series of potential topics, there are similarities in all of the possible subjects. The business stakeholders for example, the product owner, must allow the team freedom to do refactoring. It is a disciplined way to clean up code that minimizes the chances of introduci. The 7th international conference on objectoriented information. Questions tagged refactoring ask question refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior. Similarly, hublike classes violate the principle of modularization that naturally guides us towards a design with reduced coupling. Much has been written about refactoring in software engineering and computer science. This research is compared and discussed based on a number of different criteria.
Martin fowler, avoid repetition, ieee software, janfeb. The process of software evolution is driven by requests for changes and includes change impact analysis, release planning and change implementation. Improving the design of existing code addison wesley 2000 presents an extended example of refactoring, which covers pages 1 to 52 of the book. I am a new hire out of university at a large software company tasked with either refactoring or rewriting a large legacy method 500. Refactoring is a disciplined technique for restructuring an existing body of code, altering its internal structure without changing its external behavior its heart is a series of small behavior preserving transformations. A key goal of development antipatterns is to describe useful forms of software refactoring. The mantra of refactoring is clean code and simple design. Refactoring is a good thing because complex expressions are typically built from simpler, more grokable components. Lehmans laws, such as the notion that change is continuous, describe a number of insights derived from longterm studies of system evolution. There are a lot of examples on the internet of simple games like tictactoe or snake that have a lot of smells but are simple enough to start with refactoring. Then, had to show only some stuff for nonpremium folks. Potential advantages of refactoring may include improved. But once in a while, a team will have to do a large refactoring.
Second would be to develop good relationships in your work. Apr 25, 2016 this article provides a motivation for architecture refactoring and discusses a few potential research directions for architecture refactoring. In principlebased refactoring, halladay explains a set of software refactoring rules and links the refactoring rules back to the basic principles that drive robust software design. Software refactoring software refactoring restructuring existing code by altering its internal structure without changing its external behavior adapted from martin fowlers book to avoid duplications a. When youre wearing the refactoring hat, every change you make preservers observable behavior, keeps the tests green, and allows you to make many small changes without going near a debugger. It clearly illustrates the potentially high impact a simple refactoring may. The course covers 21 smells of bad code and 66 refactoring techniques to fix them. Introduction to software engineeringtestingrefactoring. In his famous book martin fowler defines refactoring as follows. Cleaning up code so that it minimizes chances of bugs. In this article, i want to introduce how to use refactoring and unit test in improving code quality through an example. Creating agile software with refactoring and testdriven. Industrial software systems are typically complex and longlived. From personal experience, i can say that refactoring is absolutely and totally required to develop a large piece of software in the face of an everchanging list of features.
My books have both shorter examples and a longer, actually a book long example. Code refactoring is the process of restructuring existing computer code without changing its external behavior in order to make it easier to understand, reason about, or extend. Typically, this is done by applying series of refactorings, each of which is a usually tiny change in a computer programs source code that does not modify its functional requirements. Participants had the opportunity to introduce their own work both in short plenary talks and more detailed presentations during breakout sessions, with daily keynote talks. Software development risk management plan with examples. With these two hand in hand, one of the contributing effects of the purpose of a report is help you decide on making the right decisions. For example, if a programmer wants to add new functionality to a program, he may decide to refactor the program first to simplify the addition of new functionality in order to prevent software entropy. For an example of efficiency, count the terms and operators.
Refactoring, software process, methodologies, software metrics. Explore computer sciencecse seminar topics with abstract, computer science cse engineering and technology seminar topics, latest cse mca it seminar papers 2015 2016, recent essay topics, speech ideas, dissertation, thesis, ieee and mca seminar topics, reports, synopsis, advantanges, disadvantages, abstracts, presentation pdf, doc and ppt for final. Pdf analysis of code refactoring impact on software quality. This article provides a motivation for architecture refactoring and discusses a few potential research directions for architecture refactoring. Factor factor one of two or more quantities that divides a given quantity without a remainder, e. Moving features between objects refactoring these code refactoring techniques show how to safely move functionality between classes, create new classes, and hide implementation details from public access. Refactoring software engineering kent state university mathematics. A good example of this is when two different but similar classes require some of the same functionality. This paper presents a framework for refactoring java code. Code refactoring is the process of restructuring existing computer codechanging the factoringwithout changing its external behavior. But i find that when i can spot how to do a preparatory refactoring it results in a faster and lessstressful programming experience, because the trilby is faster and less stressful than the hard hat.
579 1087 810 1084 1394 421 1132 330 256 717 911 1197 556 165 325 1533 827 1195 533 1552 842 491 328 362 630 651 1415 766 749 133 601 1296 926 493 953 229