System Design Knowledge Sharing

Everything we need to know about system design. Codes are mostly in C++.

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DDIA

Unified Modeling Language (UML)

UML is a standardized modeling language that is used to visualize the design of a system. It is commonly used in software engineering.

Class Name（类名）, Field（属性）, Methods（方法）

If something is Italic, it means that the thing is abstract, or is an interface. Also,

• "+" means public；
• "-" means private；
• "#" means protected；
• no sign means default。

Relationships

Association(关联)

Dependency（依赖）

Aggregation（聚合）

Composition（组合）

A special aggregation relationship of strong dependence. If B does not exist, the part does not exist. For example, the company does not exist, and the department will also cease to exist;

Realization（实现）

Inherit abstract class.

Generalization（泛化）

Inherit non-abstract class.

Design Patterns

visitor

observer

iterator

composite

adapter

command

decorator

strategy

singleton

test driven development(TDD)

factory

cohesion & coupling

How to handle real-life questions

https://www.educative.io/courses/grokking-modern-system-design-interview-for-engineers-managers/xVXol171Ex9

• understand the design problem and its requirements(functional & nonfunctional ).
• handle data (size, grow rate, usage, read/write heavy, consistency, privacy, etc)
• components
• tradeoffs

Resources

https://www.educative.io/courses/grokking-the-system-design-interview ( best for junior)

https://bestresources.co/resource/best-handpicked-system-design-interesting-reads-qvbimi

Reference

https://www.ibm.com/docs/en/rsar/9.5

https://zhuanlan.zhihu.com/p/109655171

https://design-patterns.readthedocs.io/zh_CN/latest/read_uml.html