Layered Architecture & SOA Architecture

First, the type of layered architecture

​ Layered architecture is a long-standing architectural pattern, it can also be called N-tier architecture; usually, N is at least two layers, such as our common C/S architecture and B/S architecture.When we develop web applications or android applications, the three-tier architecture is commonly used, such as MVC (javaWeb), MVP (android); of course, in addition to this, there are 4-tier architecture and 5-tier architecture, 5-tier architecture is relatively rare;

Layered Architecture

​ The four-tier architecture we often talk about is to reduce the workload of software designers, reduce repetitive codes, improve development speed, and make software quite maintainable and easy to expand.The four-tier architecture can have a clear idea for multiple people to develop the same software.I divided the system into presentation layer (UI), business logic layer (Bussiness), data access layer (DataAccess), and data entity layer (DataEnity).If you also consider database design, it's a five-tier architecture.My starting point is from the software designer's point of view, so it is four layers.Among them, it is best to write all stored procedures and SQL statements in the database, which can facilitate the modification and maintenance of changes in the database, and can also reduce the instability in the program.

Logical Structure Hierarchical Architecture

​ In simple terms, logical layering is a top-down dependency.Such as operating system kernel architecture, TCP/IP architecture

1. linux operating system architecture

2. TCP/IP Architecture