This book will describe, in the style of anti-patterns, what often goes wrong in retrospectives and what you can do to help it. Based on 10+ years. 1. Com S Object-Oriented Analysis and Design. Anti-Patterns. 2. Com S Object-Oriented Analysis and Design. 2. Com S Object-Oriented Analysis. AntiPatterns Analysis Paralysis in Chapter 7 and Design by Committee in AntiPatterns clarify the negative patterns that cause development roadblocks, and.
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AntiPatterns In Java Application. Development. ExxonMobil Research & Engineering Co. Clinton, New Jersey. Michael P. Redlich. () time analyzing the problem and potential solutions. Avoid sources of misinformation. Source: Antipatterns: The survival Guide - olerivatcu.ga wget olerivatcu.ga++olerivatcu.ga wget http:// olerivatcu.ga wget olerivatcu.ga olerivatcu.ga /free/files/olerivatcu.ga
Still others prefer to see code. The fashion in which we present our architectures affects our perceptions of whether they are good or bad, clear or muddled, and elegant or muddy. Indeed, one of the reasons that architecture is neglected is that much of it is "under the hood", where nobody can see it. If the system works, and it can be shipped, who cares what it looks like on the inside?
Complexity: One reason for a muddled architecture is that software often reflects the inherent complexity of the application domain. This is what Brooks called "essential complexity" [Brooks ]. In other words, the software is ugly because the problem is ugly, or at least not well understood.
Renegotiating these relationships is often difficult once the basic boundaries among system elements are drawn. These relationships can take on the immutable character of "site" boundaries that Brand [Brand ] observed in real cities.
Big problems can arises when the needs of the applications force unrestrained communication across these boundaries. The system becomes a tangled mess, and what little structure is there can erode further. Change: Architecture is a hypothesis about the future that holds that subsequent change will be confined to that part of the design space encompassed by that architecture. Of course, the world has a way of mocking our attempts to make such predictions by tossing us the totally unexpected.
Such changes may cut directly across the grain of fundamental architectural decisions made in the light of the certainty that these new contingencies could never arise.
The "right" thing to do might be to redesign the system. The more likely result is that the architecture of the system will be expediently perturbed to address the new requirements, with only passing regard for the effect of these radical changes on the structure of the system. Scale: Managing a large project is a qualitatively different problem from managing a small one, just as leading a division of infantry into battle is different from commanding a small special forces team.
Obviously, "divide and conquer" is, in general, an insufficient answer to the problems posed by scale. Everyone seems to agree they are a bad idea, but forces conspire to promote their emergence anyway.
What is it that they are doing right? Shantytowns are usually built from common, inexpensive materials and simple tools. Shantytowns can be built using relatively unskilled labor. Even though the labor force is "unskilled" in the customary sense, the construction and maintenance of this sort of housing can be quite labor intensive. There is little specialization. Each housing unit is constructed and maintained primarily by its inhabitants, and each inhabitant must be a jack of all the necessary trades.
There is little concern for infrastructure, since infrastructure requires coordination and capital, and specialized resources, equipment, and skills.
There is little overall planning or regulation of growth. Shantytowns emerge where there is a need for housing, a surplus of unskilled labor, and a dearth of capital investment. Shantytowns fulfill an immediate, local need for housing by bringing available resources to bear on the problem. Loftier architectural goals are a luxury that has to wait.
Maintaining a shantytown is labor-intensive and requires a broad range of skills. One must be able to improvise repairs with the materials on-hand, and master tasks from roof repair to ad hoc sanitation. However, there is little of the sort of skilled specialization that one sees in a mature economy. All too many of our software systems are, architecturally, little more than shantytowns.
Investment in tools and infrastructure is too often inadequate. Tools are usually primitive, and infrastructure such as libraries and frameworks, is undercapitalized. Individual portions of the system grow unchecked, and the lack of infrastructure and architecture allows problems in one part of the system to erode and pollute adjacent portions.
Deadlines loom like monsoons, and architectural elegance seems unattainable. This experience may inspire changes to data formats and the user interface that undermine architectural decisions that had been thought to be settled. This phenomenon is not unique to software. The money is running out, and the finishing touches are being put on just those parts of the space that will interact the most with its occupants.
During this period, it can become evident that certain wish-list items are not going to make it, and that exotic experiments are not going to work. Compromise becomes the "order of the day". The time and money to chase perfection are seldom available, nor should they be. To survive, we must do what it takes to get our software working and out the door on time. You need to deliver quality software on time, and under budget. Cost: Architecture is a long-term investment. It is easy for the people who are paying the bills to dismiss it, unless there is some tangible immediate benefit, such a tax write-off, or unless surplus money and time happens to be available.
Such is seldom the case. More often, the customer needs something working by tomorrow. Often, the people who control and manage the development process simply do not regard architecture as a pressing concern. If programmers know that workmanship is invisible, and managers don't want to pay for it anyway, a vicious circle is born.
Skill: Ralph Johnson is fond of observing that is inevitable that "on average, average organizations will have average people". Organization: With larger projects, cultural, process, organizational and resource allocation issues can overwhelm technical concerns such as tools, languages, and architecture. It may seem to a programmer that whether to don hip boots and wade into a swamp is a major quality-of-life matter, but programmer comfort is but one concern to a manager, which can conflict with many others.
Architecture and code quality may strike management as frills that have only an indirect impact on their bottom lines.
Therefore, focus first on features and functionality, then focus on architecture and performance. Why do slash-and-burn tactics drive out elegance?
Does bad architecture drive out good architecture? What does this muddy code look like to the programmers in the trenches who must confront it? Data structures may be haphazardly constructed, or even next to non-existent.
Everything talks to everything else. Every shred of important state data may be global. There are those who might construe this as a sort of blackboard approach [Buschmann ], but it more closely resembles a grab bag of undifferentiated state.
Where state information is compartmentalized, it may be passed promiscuously about though Byzantine back channels that circumvent the system's original structure. Variable and function names might be uninformative, or even misleading. Functions themselves may make extensive use of global variables, as well as long lists of poorly defined parameters. The function themselves are lengthy and convoluted, and perform several unrelated tasks.
Code is duplicated. The flow of control is hard to understand, and difficult to follow. The code is simply unreadable, and borders on indecipherable.
The code exhibits the unmistakable signs of patch after patch at the hands of multiple maintainers, each of whom barely understood the consequences of what he or she was doing. Did we mention documentation? What documentation?
Make sure you cite all relevant articles that are references. Page 3 of 14 Final Report: This is the final manuscript. Following is an outline of the format for this submission. More details will be provided on the course website. Introduction 2. Review of the Literature 3. Methodology 4. Results 5. I will not accept any assignments that are sent via email. The forums BBS is available to all students registered in this course.
I will regularly participate in the forums and it will be a valuable resource for this course. Please check the forums regularly and feel free to post anything you like regarding the course content. However, all work that you submit must reflect your individual effort. Any help that you receive must be explicitly acknowledged and all reference material must be cited. Team projects and team collaboration will not constitute a violation of the above policy.
Students are responsible for the setup of their own development environment. Policy Paragraphs: 1. Each student is responsible for maintaining academic integrity and intellectual honesty in his or her academic work.
In either case, a proper citation must also be provided. When paraphrasing summarizing, or rewriting the words or ideas of another, a proper citation must be provided. Publication Manual of the American Psychological Association, Fifth Edition contains standards and examples on citation methods pp.
Changing word order, deleting words, or substituting synonyms is not acceptable paraphrasing—it is plagiarism, even when properly cited. Rather than make changes of this nature, the source should be quoted as written.
Writing Skills Each student must demonstrate proficiency in the use of the English language in all work submitted for this course. Grammatical errors, spelling errors, and writing that does not express ideas clearly will affect your grade.
The professor will not provide remedial help concerning writing problems. Students who are unable to write correctly and clearly are urged to contact the program office for sources of remedial help.
Form and Style Requirements for Student Work For an individual course, the course professor will specify form and style requirements in the course syllabus. There are several books that provide general guidelines for form, style, and general writing principles in the preparation of papers, assignments, and reports. On Writing Well Zinsser, is an excellent guide to clear, logical, and organized writing. The Publication Manual of the American Psychological Association, Fifth Edition addresses editorial style, grammar, and organization, and its use is often required by course professors.
Communication by Email Students must use their NSU email accounts when sending email to faculty and staff and must clearly identify their names and other appropriate information, e. When communicating with students via email, faculty and staff members will send mail only to NSU email accounts using NSU-recognized usernames. Students who forward their NSU-generated email to other email accounts do so at their own risk.
SCIS uses various course management tools that use private internal email systems. NSU offers students web-based email access. Students are encouraged to check their NSU email account daily. Students do not have a right to an incomplete, which may be granted only when there is evidence of just cause.
A student desiring an incomplete must submit a written appeal to the course professor at least two weeks prior to the end of the term.
Should the course professor agree, an incomplete contract will be prepared by the student and signed by both student and professor. The Page 6 of 14 incomplete contract must contain a description of the work to be completed and a timetable.
The completion period should be the shortest possible. The program office will monitor each incomplete contract. If a change-of-grade form is not submitted by the scheduled completion date, the grade will be changed automatically from I to F. No student may graduate with an I on his or her record.
Grade Policy Regarding Withdrawals Course withdrawal requests must be submitted to the program office in writing by the student. Requests for withdrawal must be received by the program office at least three weeks prior to the last day of the term. Requests for withdrawal received after p.
EST on the withdrawal deadline date will not be accepted.
Failure to attend class or participate in course activities will not automatically drop or withdraw a student from the class or the university. Students who have not withdrawn by the withdrawal deadline will receive letter grades that reflect their performance in the course. When a withdrawal request is approved, the transcript will show a grade of W Withdrawn for the course. Students with a history of withdrawals risk dismissal. Depending on the date of withdrawal, the student may be eligible for a partial refund.
Software as Capital. New York: Oxford. Software Engineering Economics. Programming as if People Mattered. The Mythical Man Month. Reading, MA: Addison Wesley. New York: McGraw Hill. Wicked Problems, Righteous Solutions. Sign in with Facebook Sign in options. Join Goodreads.
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