A master in the field of software architecture -- Reading Notes of the beauty of Architecture

One 、 Journal entry

The whole book is written by 23 Written by a famous person , Everyone has long had experience in software design , Give many architectural design practices with practical guiding significance . Interestingly, this book has always emphasized the importance of software architecture Conceptual consistency , That is, architecture design needs context harmony and unity , But writing this book is a collection of opinions , It's hard to guarantee that what they think is the same , Therefore, this book needs to have a clear framework guidelines to restrict the writers . The framework principle is Editors should have the same concerns ： Let good designers and architects describe the software architecture they choose , Peel off the structure layer by layer “ heart ”, Show how the architecture enables software to implement these features .

Reading this book can clearly capture the context of the article , The preface introduces the composition of the book , Without reading the preface On the premise of , Readers can also deduce from the narrative mode of one chapter to that of other chapters （ The lines ）, Reduce the cost of understanding , Let readers feel relaxed and happy .

The book has 5 part , Because the author is based on Web Do backend development , Omit the third part without looking . Focus on reading when necessary . The idea of extreme programming is not to think too much , Code immediately , Get out the key functions , Design can be delayed . With the corresponding , While reading this book , The author adopts Extreme reading Thought , Read first , Then extract and take notes , The analysis can be delayed .

In fact, think about how similar architecture is to blogging , Blogs need a clear framework , A good framework is good for both readers and authors , Readers can quickly get the content they need from excellent blogs , The author can enjoy writing , Such as chapter expansion 、 Add 、 Modification is an easy thing .

One 、 What is software architecture

just as 《 Moral by 》 The first chapter says ：“ The tao can be , Very way .” Architecture is a kind of “ Avenue ”, The structure of beauty is “ Very way ”, It takes a long time of training to execute and land . The definition of software architecture is not unified , But the description is relatively complete, such as 《Software Architecture in Practice》 Talk about ：“ A software architecture is a structure or group of structures of a system , Contains software elements 、 The externally visible attributes of these elements and the relationships between them .‘ Externally visible ’ The attribute of refers to the assumption of other elements on this element , Such as the services it provides 、 Characteristics of execution 、 Error handling 、 Use of shared resources, etc ”.

The expression of architecture is hierarchical structure , The characteristic is conceptual integrity .

The benefits of maintaining conceptual integrity in architectural design ：

• Let developers know part of the system , Be able to quickly understand other parts of the system ;
• Let developers use part of their working experience in the system , To develop and maintain other parts of the system ;

Two 、 How to evaluate software architecture

Two evaluation methods ：

• Determine the attributes of the architecture by modeling or simulating one or more aspects of the system
  Performance model 、 Failure tree model, etc ;
• Evaluate by questioning the architect （ Widely used ）
  Architecture compromise analysis method 、 Active review method .

3、 ... and 、 Software architecture “ Hall of fame ”

name	source
A-7E Shipboard flight processor	U.S. Naval Research Laboratory
5ESS Telephone switch	Lucent
web	Tim · berners - Li （Tim Berners-Lee）
UNIX	Dennis · Ricci 、 Kenneth · Thompson

Four 、 The responsibilities of software architects

1. Focus on function and performance at the same time, and the latter is the primary concern ;
2. Involve stakeholders ;
3. Create an architecture that maintains a way of thinking and philosophy ;

Concerns include ：

5、 ... and 、 Excerpt of key sentences