Microservices with Spring Boot and Spring Cloud

✨ RESTful Web Services ✨

Spring Boot Application

Various request methods

Exception Handling

Validation API

HATEOAS

Internationalization for Restful Web Services

Content negotiation - Implementing support for XML

Swagger Documentation - URL for SWAGGER UI

* http://localhost:8080/swagger-ui/ or http://localhost:8080/swagger-ui/index.html
* http://localhost:8080/v2/api-docs

Enhancing Swagger Documentation with Custom Annotations

Monitoring APIs with Spring Boot Actuator

URLs for Actuator

* http://localhost:8080/actuator/
* http://localhost:8080/explorer/index.html#uri=/

Filtering for RESTful Web Services

* Static Filtering
* Dynamic Filtering

Versioning RESTful Services

Connecting RESTful Web Service to JPA

Richardson Maturity Model

RESTful Web Services - Best Practices

✨ Microservices ✨

Limits Service

* Using the values from application.properties file using @ConfigurationProperties annotation.
* Fetching the values from Spring Cloud Config Server & Git Repository
* Port : 8080, 8081, ...

Spring Cloud Config Server

* Port : 8888
* With a local Git Repository
	* Open Command Prompt -> Navigate to the project folder and execute the below commands
	* mkdir git-localconfig-repo
	* cd git-localconfig-repo
	* git init
* After this, open IDE -> Right Click project -> Build Path -> Configure Build Path -> Source -> Link Source -> Browse to the local git repository -> Apply -> Close
* Git Repository folder will be linked to the project in IDE.
* Create a file in that Git Repository folder from IDE.
* After this, open Command Prompt and execute the below commands to add files that are created/modified and commit.
	* git add -A
	* git status
	* git commit -m "first commit"
*  Steps to fetch config values from a Github Repository URL
	* Add the below properties in application.properties of Spring Cloud Config Server.
	* spring.cloud.config.server.git.uri=Any Git Repository URL that has the configuration files
	* spring.cloud.config.server.git.username=Username of the Git Repository
	* spring.cloud.config.server.git.password=Password of the Git Repository
* NOTE : If config values in Git Repository (Local Repository or Git URL) is modified
		, then hit POST - http://localhost:8080/actuator/bus-refresh from Postman to refresh and get the updated values from config files.

Currency Exchange Service

* Port : 8000, 8001, 8002, ...

Currency Conversion Service

* Port : 8100, 8101, 8102, ...

RestTemplate & Feign REST Client for Service Invocation

Setting up client side load balancing with Ribbon

Eureka Naming Server

* Port : 8761

API Gateways - Zuul API Gateway

* Netflix Zuul Api Gateway Server
* Port : 8765

Distributed Tracing

* Implementing Spring Cloud Sleuth
	* To enable logging across all services with a common id
* RabbitMQ & Erlang
	* Erlang 	: https://www.erlang.org/downloads
	* RabbitMQ 	: https://www.rabbitmq.com/install-windows.html
* Zipkin
	* https://zipkin.io/pages/quickstart -> Java -> Copy paste the URL in browser
	* .sh file will be downloaded
	* Place it in the project folder and double click
	* A .jar is downloaded
	* Open cmd and navigate to the project folder
	* Execute the following commands
		* set RABBIT_URI=amqp://localhost
		* java -jar zipkin.jar
	* After this, Zipkin Server will be up and running
	* URL for Zipkin UI : http://localhost:9411/zipkin

Spring Cloud Bus

Fault Tolerance with Hystrix

✨ Running all applications ✨

Open command prompt and navigate to the project folder

Execute the following commands

	* set RABBIT_URI=amqp://localhost
	* java -jar zipkin.jar

After this, Zipkin Server will be up and running

URL for Zipkin UI : http://localhost:9411/zipkin

Order of executing services :

	* Zipkin Server
	* Eureka Naming Server
	* Netflix Zuul Api Gateway Server
	* Currency Exchange Service
	* Currency Conversion Service