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File Size: 10083 KB
Print Length: 430 pages
Simultaneous Device Usage: Up to 5 simultaneous devices, per publisher limits
Publisher: Prentice Hall; 1 edition (September 12, 2017)
Publication Date: September 12, 2017
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B075LRM681
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I liked this book less than the Clean Code, but it was a better read for me than the Clean Coder. I've found a distillation of this book in article from Robert Martin, which he wrote in 2012 while working at 8th Light (I cannot paste a link in here). The book is partially a very detailed description of the ideas from the article and what is behind them.The book starts with 3 myths we developers live in:1. Myth: We just need to get to market first and we clean it up later.2. Myth: Messy code makes us faster today and slows us later. Myth: We can switch mode from making messes to cleaning messes. (making messes is always slower, even in very short term as shown in example of a simple kata in the book)3. Myth: Starting from scratch is a solution.There is a well written history lesson in the next part. Uncle Bob presents Structured Programming, OOP and Functional Programming and says there is nothing else (programming paradigm-wise) to be invented. Part 3 is about SOLID principles from architecture point of view and part 4 are his Component Principles about component cohesion and coupling from his Agile Software Development book.Part 5 is about Architecture and was the most interesting to read. Most memorable chapters for me were the Screaming Architecture and the Clean Architecture. Both of them are not new, you could have seen them in his videos or the article from 8thlight. The point of Screaming Architecture is that when a new developer joins a health-care project, he should be able to immediately tell "this is a health-care project" just from the project structure. Another topic which was part of multiple chapters, are micro-services. I felt that Robert Martin is not very fond of starting with them. He says services are little more than expensive function calls and as a communication mechanism between the project boundaries (i.e. a detail), they are a decision which should be deffered as far as possible.Part 6, the Details, are a detailed explanations of his article Clean Architecture from 2012. There is a little gem in there, the Missing Chapter 34 written by Simon Brown. I liked his explanation of 4 different kinds of packaging classes together to form components.
I was hesitant to buy this book because Uncle Bob is known in software community as a fundamentalist zealot for his views on software design and testing (TDD). This book starts out with similar hard views and he claims that a useless program that is easy to maintain is better than a useful program that is impossible to maintain. I have seen a lot of bad design and implementations in my twenty plus years of experience as a software architect/engineer but nothing is impossible. As a profession software engineer, you are expected to support business and have to work with various constraints in your organization. These constraints vary based on the context and unique environment, which is why I prefer Kent Beck’s advice of making it work, making it right (refactoring) and making it fast.Most of first one third of the book provides overview of programming paradigms such as structured design, object oriented, and functional decomposition. He then covers SOLID principles that he is best known for, i.e. single responsibility principle (SRP), open-close principle, liskov substitution principle, interface separation principle (ISP) and dependency inversion principle. In my opinion, these principles can be boiled down to interface/implementation separation and using composition over inheritance (concrete). He then applies these principles to components design such as reuse/release equivalence principle for releasing same component together, common closure principle similar to SRP and common reuse principle for using interfaces similar to ISP. Uncle Bob provides useful advice for using acyclic dependency principle for dependencies between components and ensuring that abstract/interfaces are used in stable components and volatile components (concrete implementation) should depend on stable components and not otherwise.The last one quarter of the book finally starts with explanation on clean architecture that uses hexagonal architecture. He states that architecture should be independent of frameworks, UI and database. His definition of architecture only focuses on component design and communication but I use architecture as any design decision that is costly to change and often that include choice of databases, frameworks and UI. He uses layers and boundaries to divide system into various components and recommends use of entities for business policies, using techniques such as humble object pattern for testing hard to test components. In final chapters, he proposed designing components based on use cases instead of horizontal, which has worked better in my experience when working on a large system.In the end, this book has plenty of nuggets on design of components but take this advice with a grain of salt. Uncle Bob’s militant views on clean design, test driven development and his abhorrence for tools is not very pragmatic. For example, he doesn’t mention technical debt, refactoring or dealing with legacy systems. Though, he pays attention to maintainability but he ignores most of other non functional requirements such as scalability, availability, reliability and ignores emphasis on developer productivity. In my experience, software design and development should start with the business requirements, constraints and organization structure. You may be working in a startup that needs to prove an idea with minimal effort or you may be working on designing a service with a large number of users. Similarly, you may be working with a small team or on a large project that needs to interact with a number of teams where you may need to apply Conway’s law to design the system. In real world, you face these choices instead of writing perfect components with 100% test coverage, which may be maintainable but not useful to anyone and thus killing your company and leaving you without work.
I have read four books, dozens of articles, and have watched scores of videos by Uncle Bob. As always I found this one fascinating and well written. Bob has a flare for synthesizing very complex technical material from many sources, then boiling it down to easily and enjoyably absorbable explanations. He manages the magic of combining theoretically deep discussion with a very practical, even advice-like perspective. I'm so happy he's made himself the uncle of young programmers like me and invited us to squat on his lawn.My caveat is that, having gone through so much of Bob's previous material, there was unfortunately much here that was already familiar to me, including some sections that are taken almost verbatim from his previous writings. In itself this is no problem - had it been the first I ever read of the man I would be totally ecstatic about it, and it's reasonable of him to assume that most readers would not have followed him around the internets as assiduously as I have. But I was hoping to hear more about topics he only hinted at in his blog posts, e.g. the different kinds of architecture implied by different desired user experiences. I read him mention event-driven, request-based, and batch processing, and I was assuming he would elaborate on these ideas in this book, which he does not. There are many other details I wish he'd gone into or at least offered good follow-up reading on, such as presenters and the creation of use cases.Finally, he does not appear to provide the name of the stellar body on the cover, which is an unfortunate break with custom.
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