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New PDF release: AntiPatterns: Refactoring Software, Architectures, and

By William J. Brown, Raphael C. Malveau, Hays W. "Skip" McCormick, Thomas J. Mowbray

ISBN-10: 0471197130

ISBN-13: 9780471197133

"The AntiPatterns authors have basically been there and performed that once it involves dealing with software program improvement efforts. I resonated with one perception after one other, having witnessed too many wayward initiatives myself. The adventure during this e-book is palpable." -John Vlissides, IBM learn

"This booklet permits managers, architects, and builders to benefit from the painful errors of others. The high-level AntiPatterns on software program structure are a very priceless contribution to software program engineering. hugely recommended!" -Kyle Brown writer of The layout styles Smalltalk spouse

"AntiPatterns maintains the fashion began in layout styles. The authors have stumbled on and named universal challenge events due to negative administration or structure regulate, blunders which such a lot skilled practitioners will realize. if you happen to end up with one of many AntiPatterns, they even supply a few clues on tips to get your self out of the situation." -Gerard Meszaros, leader Architect, item structures crew

Are you headed into the software program improvement mine box? stick with anyone in the event you can, but when you're in your own-better get the map! AntiPatterns is the map. This publication is helping you navigate via today's risky software program improvement tasks. simply examine the statistics:
* approximately one-third of all software program initiatives are cancelled.
* Two-thirds of all software program tasks come upon fee overruns in far more than 200%.
* Over eighty% of all software program tasks are deemed failures.

While styles assist you to spot and enforce strategies, designs, and codes that paintings, AntiPatterns do the complete opposite; they allow you to zero-in at the improvement detonators, architectural tripwires, and character booby traps which can spell doom to your undertaking. Written by means of an all-star crew of object-oriented platforms builders, AntiPatterns identifies forty of the commonest AntiPatterns within the components of software program improvement, structure, and undertaking administration. The authors then enable you observe and defuse AntiPatterns in addition to provide refactored recommendations for every AntiPattern presented.

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Additional info for AntiPatterns: Refactoring Software, Architectures, and Projects in Crisis

Sample text

Structure: What are the class hierarchy diagrams for the objects in this pattern? Participants: What are the objects that participate in this pattern? Collaborations: How do these objects interoperate? Consequences: What are the trade−offs of using this pattern? Implementation: Which techniques or issues arise in applying this pattern? Sample Code: What is an example of the pattern in source code? Known Uses: What are some examples of real systems using this pattern? Related Patterns: What other patterns from this pattern collection are related to this pattern?

It may be inefficient, or introduce excessive complexity to reuse the Blob for subsets of its functionality. • The Blob Class may be expensive to load into memory, using excessive resources, even for simple operations. Typical Causes • Lack of an object−oriented architecture. The designers may not have an adequate understanding of object−oriented principles. Alternatively, the team may lack appropriate abstraction skills. • Lack of (any) architecture. The absence of definition of the system components, their interactions, and the specific use of the selected programming languages.

The Blob is often accompanied by unnecessary code, making it hard to differentiate between the useful functionality of the Blob Class and no−longer−used code (see the Lava Flow AntiPattern). Symptoms And Consequences • Single class with a large number of attributes, operations, or both. A class with 60 or more attributes and operations usually indicates the presence of the Blob [Akroyd 96]. • A disparate collection of unrelated attributes and operations encapsulated in a single class. An overall lack of cohesiveness of the attributes and operations is typical of the Blob.

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AntiPatterns: Refactoring Software, Architectures, and Projects in Crisis by William J. Brown, Raphael C. Malveau, Hays W. "Skip" McCormick, Thomas J. Mowbray


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