Microservice topic 16-Spring Cloud overall review

Preface

In the previous chapter, we talked about Spring Cloud Stream implementation

This section is the last section of the topic of microservices. Let's make a summary of this topic! There are 16 sections in total, which are:

• Microservice topic 01-Spring Application
• Microservice topic 02-Spring Web MVC view technology
• Microservice topic 03-REST
• Microservice topic 04-Spring WebFlux principle
• Microservice topic 05-Spring WebFlux application
• Microservices topic 06-Cloud Native Applications
• Microservice topic 07-Spring Cloud configuration management
• Microservice topic 08-Spring Cloud service discovery
• Microservice topic 09-Spring Cloud load balancing
• Microservice topic 10-Spring Cloud service circuit breaker
• Microservice topic 11-Spring Cloud service call
• Microservice topic 12-Spring Cloud Gateway
• Microservice topic 13-Spring Cloud Stream (on)
• Microservice topic 14-Spring Cloud Bus
• Microservice topic 15-Spring Cloud Stream implementation
• Microservice topic 16-Spring Cloud overall review

The key points of this section are:

• Java basic review
• Springboot feature review
• Springcloud feature review

Write in front

1. Any conclusions need to be verified by procedures (stable reproduction)
2. Write code often, watch more, think more
3. Train thinking mode (abstract thinking, dialectical thinking, reverse thinking, divergent thinking)
4. Original accumulation (JDK, framework: Spring, Tomcat, Log4j, etc.)
5. Less pointers to the companion code, and discussion on the plan (whether Code Review thinking is rigorous)
6. Willing to share (lectures, technical salons, discussion meetings, etc.)
7. How to read books selectively (for reference only)

Recommend a book here:
Link: https://pan.baidu.com/s/1A_QLYev4bQFCtojtmgr-7A
Extraction code: pcxy
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Java basics

tool

To do well, we must first sharpen our tools. Let’s take a look at the basic tools of Java?

1. Java compiler

javax.tools.JavaCompiler

2、Jar = Zip

Spring Boot Fat Jar compression ratio = 0

3、 Java Debug

JDB

ClassLoader

ClassLoader: Java class loader, as one of the core concepts of java, is very important!

• Class

• ClassLoader

  • Class
  • Resource management
  • Load Class 1.7 in parallel
  • Concurrency (Thread)
  • META Space

Beans

Java can be said to be an object-oriented programming language, and this is mainly around beans!

• Introspection ( Introspector): Java Bean specification + reflection (Reflection) + reference (Reference)
  • BeanInfo
  • PropertyDescriptor
  • …

Spring example: PropertyEditorRegistrarregistrationPropertyEditor

PropertyEditor Types required for character text transposition

<bean class="User">
    <property name="id" value="9" /> <!-- String to Long -->
    <property name="age" value="32" /> <!-- String to Integer -->
</bean>

Evolution of the Java programming model

1. Object-oriented programming (OOP)

• Encapsulation
• Derivative
• Polymorphism

Design Patterns

• GoF 23
• Reactor / Proactor

2. Java 1.2 reflection programming

3、Java 1.3 AOP

4、Java 1.4 NIO（Non-Blocking）

5. Java 1.5 generic/concurrent programming

6. Java 1.6 script programming (JavaScript)

7 、 Java 1.7 NIO 2

8. Java 1.8 Lambda programming

9. Java 9 Modularity/Reactive Programming

A brief history of Spring Framework

Core features

1 、 IoC / DI

Based on Java reflection, Java Beans introspection

2、 AOP

• The interface type is based on Java AOP Proxy
• The class type is implemented based on CgLib promotion

3. Resource management

• ClassLoader
• URL
• I / O

4. Event

• Java standard event/listening mechanism
  • java.util.EventObject
  • java.util.EventListener
• Java observer pattern
  • java.util.Observer
  • java.util.Observable

5. Internationalization

• java.util.ResourceBundle
  • java.util.PropertyResourceBundle
• java.text.MessageFormat

6. Verification

• Validator
• Bean Validation （JSR-303
  • LocalValidatorFactoryBean
    • javax.validation.ValidatorFactory
    • org.springframework.validation.SmartValidator

7, data binding

• DataBinder

8. Type conversion

• java.beans.PropertyEditor
• Convertor
• ConversionService

9、 Spring EL

• JSP EL

• OGNL

data access

1. Affairs

• JDBC Transaction
• JTA （Java Transaction API）
• JTS（Java Transaction Service）

2、 JDBC

• JDBC -> JdbcTemplate

3 、 ORM

• Hibernate
• iBatis

4、 XML

• SAX（Simple API for XML）
• XML Stream
• JAXB（Java API for XML Binding）
• DOM（Document Object Model）

Web Servlet

Spring MVC

• Early learning from Struts
• Learning from JAX-RS (REST Java Specification)

Web Reactive

Spring WebFlux

• Reactor
  • RxJava
• Netty

Spring Framework A programming model

Multiple XML configurations -> Multiple annotation configurations

Spring Boot features

• Automatic assembly: realize the specification is greater than the configuration (reduce the configuration)
• Production-Ready: Improve or simplify the operation and maintenance system of Spring applications
  • External configuration: adjust the internal behavior of the application through external configuration
• Embedded container: Assemble an embedded Web container
  • Servlet container
  • Netty web container

Spring Cloud features

• Service discovery
• Remote call
  • Client statement (Feign)
  • Service Fuse (Hystrix)
  • Load balancing (Ribbon)
  • Service call link tracking (Sleuth)
• Distributed configuration
  • Version system (Git)
  • Distributed implementation (custom implementation)
• Asynchronous message
  • Message Bus (Spring Cloud Bus)
  • Message integration (Spring Cloud Stream)
• Gateway
  • Spring Cloud 1.x / 2.x Zuul
  • Spring Cloud Gateway

More

Distributed transaction

Final consistency

• Message-based eventual consistency

Safety

postscript

This is the end of the microservice topic. The next topic preview: Concurrent programming topic

For more architectural knowledge, please pay attention to this series of articles on Java : The Road to Growth of Java Architects