Microservices API Gateway Implementation in Spring Boot | Code Decode | Citizen Vaccination Example

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In this video of code decode we have demonstrate the implementation of api gateway in spring boot which is a part 5 of microservice series by code decode Udemy Course of Code Decode on Microservice k8s AWS CICD link: https://openinapp.co/udemycourse Course Description Video : https://yt.openinapp.co/dmjvd Api Gateway Part 1 : https://youtu.be/YK1XRvoXllE Microservices tutorial full playlist : https://www.youtube.com/watch?v=nElpCWmpSew&list=PLyHJZXNdCXsd2e3NMW9sZbto8RB5foBtp What is API gateway in microservices? API Gateway in Microservices is a Microservices Architecture pattern. API Gateway is a server and is a single-entry point into the system. API Gateway is responsible for routing the request, composition, and translation of the protocol. All the requests from the clients first come to the API Gateway and the API Gateway routes the request to the correct microservice. API Gateway can also aggregate the results from the microservices back to the client. API Gateway can also translate between web protocols like HTTP, web socket, etc. API Gateway can provide every client with a custom API as well. What is the CQRS pattern in microservice? CQRS stands for Command Query Responsibility Segregator. Every microservice as per design will have a database per service model or shared database per service. As applications become more complex, the handling of detailed queries and validations also more complex. Traditional CRUD (Create, Read, Update and Delete) data model will become cumbersome to implement and maintain. CQRS pattern proposes the separation of the read data model (Read) from the writing data model (Create, Update and Delete). The application will be segregated into Command and Query parts. The command part will be responsible for the Create, update, and delete operations. The query part will be responsible for the read operation through materialized views. This segregation provides scalability, ease of maintenance, and optimization of the database. What is a circuit breaker pattern in Microservices? Circuit Breaker is a microservice design pattern. In a microservices architecture, it is typical that a request could span multiple services. For any request, if one of the services involved in the response is not working, a circuit Breaker is used to stop the process of request and response. Without a circuit breaker in place, the client would have continuously sent requests to the service which is down. Resources will get exhausted with low performance and a bad user experience due to this. To avoid this kind of problem, a circuit breaker pattern can be used. In the case of a circuit breaker pattern, the client will invoke a remote service via a proxy. This proxy will behave as a circuit barrier. In case of failure, when the number of failures crosses a defined threshold number, the circuit breaker will trip for a defined period. During this time, requests to invoke remote service will fail. Once the time-out period for the breaker is complete, a circuit breaker will allow a defined number of tests to pass through, and only when they succeed, a circuit breaker will resume back to normal operation and will start fulfilling the requests. Most Asked Core Java Interview Questions and Answers : https://youtube.com/playlist?list=PLyHJZXNdCXscoyL5XEZoHHZ86_6h3GWE1 Advance Java Interview Questions and Answers : https://youtube.com/playlist?list=PLyHJZXNdCXsexOO1VQ4vs-BM2-8CKrixd Java 8 Interview Questions and Answers : https://youtube.com/playlist?list=PLyHJZXNdCXsdeusn4OM33415DCMQ6sUKy Hibernate Interview Questions and Answers : https://youtube.com/playlist?list=PLyHJZXNdCXsdC-p2186C6NO4FpadnCC_q Spring Boot Interview Questions and Answers : https://youtube.com/playlist?list=PLyHJZXNdCXsexOO1VQ4vs-BM2-8CKrixd Angular Playlist : https://www.youtube.com/watch?v=CAl7RQSdq2Q&list=PLyHJZXNdCXsfxRtDwtGkDD_lLfTWc1g0i GIT : https://youtube.com/playlist?list=PLyHJZXNdCXscpl6pxOnL2lRWJlzvzjyZE Subscriber and Follow Code Decode Subscriber Code Decode : https://www.youtube.com/c/CodeDecode?sub_confirmation=1 Linkedin : https://www.linkedin.com/in/codedecodeyoutube/ Instagram : https://www.instagram.com/codedecode25/ #codedecode #microservicesinjava #apigateway