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microservice

learning of microservices

img.png

--> GIT Hun Location for the code: https://github.com/vikrant-bhati/microservice.git/

--> Currency Exchange Service URL http://localhost:8000/currency-exchange/from/USD/to/INR

Ports:
8000,8001,8002...

H2-Databse Details:

URL
http://localhost:8000/h2-console


Response Structure
{
   "id":10001,
   "from":"USD",
   "to":"INR",
   "conversionMultiple":65.00,
   "environment":"8000 instance-id"
}

--> Currency Conversion Service

URL - Rest Template
http://localhost:8100/currency-conversion/from/USD/to/INR/quantity/10

URL - Feign
http://localhost:8100/currency-conversion-feign/from/USD/to/INR/quantity/10

Ports:
8100,8101,8102...

Response Structure
{
  "id": 10001,
  "from": "USD",
  "to": "INR",
  "conversionMultiple": 65.00,
  "quantity": 10,
  "totalCalculatedAmount": 650.00,
  "environment": "8000 instance-id"
}
  Will be using feign to configure routing to the Currency Exchange Service
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-feign -->
<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-feign</artifactId>
	<version>1.4.7.RELEASE</version>
</dependency>

--> Now We also created one naming server and using Eureka server and have configured eureka discovery client in all the server

Naming-server URL:
http://localhost:8761

port:8761

--> We have used api-gateway to call these services we created below URLS:

api-gateway URL:
http://localhost:8765/*

port:8765

Old URL(with capital letters in URIs):
http://localhost:8765/CURRENCY-EXCHANGE/currency-exchange/from/USD/to/INR
http://localhost:8765/CURRENCY-CONVERSION/currency-conversion-feign/from/USD/to/INR/quantity/10
http://localhost:8765/CURRENCY-CONVERSION/currency-conversion/from/USD/to/INR/quantity/10


Updated URL(with small case URIs):
http://localhost:8765/currency-exchange/currency-exchange/from/USD/to/INR
http://localhost:8765/currency-conversion/currency-conversion-feign/from/USD/to/INR/quantity/10
http://localhost:8765/currency-conversion/currency-conversion/from/USD/to/INR/quantity/10

--> If we notice closely we have two currency-conversion and currency-exhcnage in the URL we can fix this using filters. New URL after using filter: http://localhost:8765/currency-exchange/from/USD/to/INR http://localhost:8765/currency-conversion-feign/from/USD/to/INR/quantity/10 http://localhost:8765/currency-conversion/from/USD/to/INR/quantity/10

Just for fun I created another route for fun
http://localhost:8765/random-url/from/USD/to/INR/quantity/10 -> redirect to http://localhost:8765/currency-conversion/from/USD/to/INR/quantity/10

--> Resilience4J circuit Breaker https://resilience4j.readme.io/docs/getting-started-3