Single application and microservice application

What are monomer applications

An archive package contains all the functions of the application , Commonly referred to as monomer applications . An archive package （ It can be JAR、WAR、EAR Or other filing formats ） Applications with all the features , Commonly referred to as monomer applications . And the methodology of building a single application , Single application architecture . The presentation layer of all business scenarios 、 Business logic layer and data access layer are put into one project , Finally, it was compiled 、 pack , Deployed on a server . A single application framework is often used . For example, simply use django Carry out front-end and back-end development of a project , The developed project will django+uwsgi+mysqhl+nginx An application deployed on a server is a single application .

        The pain points of monomer application mainly lie in ：   

                Branch Management in parallel development

                Language switching 、 Version switching is difficult

                         

What is micro service application

         Microservice architecture style is a way to develop a single application into a set of small services , Each service runs in its own process , Lightweight communication mechanism is adopted for inter service communication . These services are built around business capabilities and can be deployed independently through a fully automated deployment mechanism . These services share the smallest centralized management , Services can be developed in different languages , Using different data storage technologies .

Comparison of advantages and disadvantages

Advantages of monomer application ：

Easy to share ： Contains all the features , Easy to share among teams .

Easy to test ： Once deployed , All services are available , Simplify the testing process , No extra dependence .

Easy to deploy ： Just copy a single file to a single directory .

Disadvantages of monomer application ：

High complexity ： Because it's a single archive , The whole project contains many modules , The module boundary is fuzzy , Dependency is not clear , The code is piled together , Make the whole project very complicated , Longer compilation time .

Limited expansion ： Monomer applications can only be expanded as a whole , Can't scale according to the needs of the business module .

The advantages of microservice Architecture

Easy to develop and maintain ： A microservice only focuses on a specific business function , So the business is clear , Less code . Developing and maintaining a single microservice is relatively simple .

A single microservice starts faster .

Local modification is easy to deploy ： The monomer application only needs to be modified , You have to redeploy the entire application . Modify a microservice , Just redeploy the service .

Flex as needed ： According to the demand , Implement fine-grained extension .

The shortcomings of microservice architecture ：

High o & M demand .

Using microservices to build distributed system . System fault tolerance 、 Network delay 、 Distributed transactions will bring huge problems .

The cost of interface adjustment is high , Microservices communicate with each other through interfaces . Modify a microservice API, Maybe all the microservices using this interface need to be adjusted .