One 、 Microservices ： Service split ＋ The remote invocation ＋ Service cluster

 Definition ： A well designed distributed architecture 
 Purpose ： High cohesion 、 Low coupling 
 shortcoming ： complex 
 Noun ： heartbeat 、 Particle size 

（ One ） service ：1 One business ＝1 A project ＝1 A service

 Service split granularity ： Different functional units of the application ( service ) To break up ？？？？？？？？？？？？

（ Two ） features ： High cohesion 、 Low coupling

1、 Single responsibility ：

1 Corresponding services 1 A business capability 

2、 Service oriented ：

 Microservices expose business interfaces 

3、 autonomous ：

 Team independence 、 Technology independence 、 Data independence 、 Deploy independent 

4、 Strong isolation ：

 Isolate service calls 、 Fault tolerance 、 Downgrade , Avoid cascading problems 

（ 3、 ... and ） Components ：

1、 Registry Center （ Maintain monitoring node information ）： Service registration discovery framework

Eureka 、Zookeeper、Consul、Nacos、Redis

2、 Load balancing ： In process load balancer

Ribbon、Nignx、LoadBalancer

3、 Service remote invocation mapping ：

Feign(http agreement ) 、Open Feign、Dubbo agreement 

4、 Flow control / Downgrade / Protect ： Fuse （ Circuit breaker ）： Service degradation fuse

Alibaba Sentinel、Hystrix、Resilience4j
 Service monitoring and protection 

5、 Unified service gateway routing （ entrance ）：

Zuul、SpringCloudGateway
 Service monitoring and protection 

6、 Unified configuration center ：

Nacos、 SpringcloudConfig、

7、 The message bus ：

Nacos、Bus
 Service monitoring and protection 

8、 Service link monitoring

Zipkin、Sleuth

（ Four ） Service split ： Avoid repetition 、 Database independence

 Definition ： Functional module splitting 、 One function module, one service 、 Independent database for each service 

1、 Avoid duplicate development ：

 Different microservices 、 Don't develop the same business repeatedly 

2、 Database independence ：

 Microservice data independence 、 Do not access databases of other microservices 

3、 Business exposure interface ： Implement remote call

 Microservices can expose their business as interfaces 、 For other microservices to call 

（ 5、 ... and ） The remote invocation ： Business exposure interface 、 Request calling

1、 Business exposure interface ： The remote invocation

 Microservices can expose their business as interfaces 、 For other microservices to call 

Two 、 Microservice implementation ：SpringCloud

 Components ：SpringCloudAlibaba
 Realization ：SpringBoot Automatic assembly 

3、 ... and 、 Microservice implementation ：SpringCloudAlibaba

 The essence ： Implementation part SpringCloud——SpringCloud The components of 
 Components ：SpringCloudAlibaba

Four 、 Microservice implementation ：Dubbo