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Application layer software development Godfather teaches you how to refactor, senior programmers must professional skills

2020-11-06 22:16:44 Java architects Alliance

Preface

Let's start with a little story

Once upon a time , A consultant visited a client to investigate his development project . The core of the system is the inheritance system , The consultant looked at some of the code written by the developers . He found the whole system quite messy , The upper superclass makes some assumptions about the operation of the system , The next subclass implements these assumptions . But these assumptions don't apply to all subclasses , Lead to overwrite (override) Work It's very heavy . Just make a change in the superclass , You can reduce a lot of rewriting . In other places , Some of the intentions of the superclass are not well understood , So some of these behaviors are repeated within subclasses . There are other places , Several subclasses do the same thing , In fact, they can be moved to the top of the inheritance system .

The consultant then advised the project manager to look at the code , Put them in order , But managers are not keen on it , After all, the program seems to work , And the project faces a lot of schedule pressure . So the manager said , Take time to do this later .

The consultant also shared his ideas with the programmers working on the inheritance system , Tell them what might happen . Programmers are sharp , We can see the seriousness of the problem immediately . They know it's not all their fault , Sometimes it really takes an outside force to find problems . It took the programmer a day or two to sort out the inheritance system , And cut out half of the code , Function intact . They are very satisfied with this , and It's faster to add new classes to the inheritance system or use other classes in the system 、 It's easier .

The project manager is not happy . It's a tight schedule , There is a lot of work to do . The system has to be released in a few months , And these programmers spent two days in vain , The work done has nothing to do with most of the features to be delivered . The original code runs normally , Their new design seems a bit too much of a perfectionist . The project is to be delivered to the customer , Is code that can run efficiently , It's not the perfect thing to please the pedant . The consultant then suggested that this sort of arrangement should be carried out in other core parts of the system , This will put the whole project on hold for a week or two . All this work is just to make the code look more beautiful , It doesn't add any new features to the system .

How do you feel about the story ? You think the consultant's advice ( To further organize the program ) Is that right ? Will you follow that old engineering proverb :“ If it still works , Just don't touch it .”

So , The author created this book ---《 restructure 》, I'd like to share it with you

Adapt to people

The target audience of this book is Professional programmers , Those who write software for a living . Examples and discussions in the book , It involves a lot of code that needs to be read and understood in detail . These examples are all in the form of Java It's written in . The reason for choosing Java, Because it's a language that is more and more widely used , and Anything with C Language background People can easily understand it .Java Is an object-oriented language , The object-oriented mechanism is very helpful for refactoring .

Although the focus is on Code , but Refactoring for system design It also has a huge impact . It's also important for senior designers and architects to understand the principles of refactoring , And use refactoring technology in your own projects . It's better to have seniority 、 Experienced developers introduce refactoring techniques , Because such people are the best at understanding the principles behind refactoring , And adjust it according to the situation , Apply it to a specific area of work . If you don't use Java, This is especially important , Because you have to rewrite my example in other languages .

Now I want to tell you , How to make full use of it without reading the whole book .

If you want to know why you should refactor , Please read the first two chapters . They tell you what refactoring is and why it should be refactored .

The first 1 Chapter reconstruction , The first case

The first 2 Chapter reconstruction principle

 

If you want to know where to refactor , Please read before 5 Chapter . It will tell you some code features , These characteristics point to “ We need to refactor ”.

The first 3 Bad smell of chapter code

 

The first 4 Chapter 2 constructs the test system

The first 5 Chapter refactoring list

The first 6 Chapter reorganizing functions

The first 7 Chapter moves features between objects

The first 8 Chapter reorganizing the data

The first 9 In this chapter, we simplify the conditional expression

The first 10 Chapter simplifying function calls

The first 11 Chapter deals with general relations

The first 12 Chapter large reconstruction

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If you want to start refactoring , From 5 The chapter extends to 12 Chapter . It can't be said to be a comprehensive list , It's just a start , It includes all the refactoring techniques I've sorted out in my work so far . I hope this is a part that you should review again and again in the future . Just skim the list at first , Look at some of them , You don't have to understand all the details . Once there is a real need to implement a code , Read it in more detail , Get help from . The list section is for reference , You don't have to read it all at once .

In addition, you should also read the list of other authors “ Guest section ”, Especially in the first 15 Chapter .

The first 13 Chapter reconstruction , Reuse and reality

The first 14 Chapter refactoring tool

The first 15 Chapter summary

So-called restructure (refactoring) It's a process like this : Without changing the external behavior of the code , Make changes to the code , To improve the internal structure of the program . Refactoring is a methodical method of program arrangement which has been formed through a lot of efforts , It can minimize the possibility of introducing errors in the finishing process . In essence , Refactoring is to improve the design of the code after it is written .

All right. , You need this information , Official account :Java Architects Alliance , Update the technology every day

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