Apache Kafka PUSH Paradigm in Action with STOMP Client — Scope This article is written to help beginners and intermediate gain insights about WebSocket bi-directional and full-duplex communication to API(Application Program Interface) and UI(User Interface) with code sample. The following concepts are explained: a. WebSocket, HTTP Upgrade b. Sock JS, JavaScript library c. STOMP Client(Simple Text-Oriented Messaging Protocol) d. Kafka asynchronous PUSH paradigm…

Integrate Kafka with Spring Boot + Kafka Template + Message Driven POJO Kafka Listener — Scope This article is written to help beginners and intermediate to understand and learn about Apache Kafka messaging pattern. It explains from a hands-on project specifically created for this article to cover the following terminologies: a. Kafka Cluster, Broker, Topic, Partition b. Leader, Follower, ISR(in-sync-replica), Zookeeper c. Producers, Message Keys, Consumers, Consumer groups d. Implement…

OKTA as Key Manager in WSO2 API Manager — Scope a. This article explains Federated Identity provider integration with WSO2 API Manager and access to protected microservices through API Gateway using OIDC 2.0 + OAuth 2.0. b. Access token validation initiated from WSO2 API Gateway through OKTA Key Manager configuration in WSO2 API Manager. c. Virtual services, Resources, Endpoints, Life cycle. d…

Seamless SPNEGO HTTP Authentication —

Simple Automation: Traverse Abstract Syntax Tree using Visitor — Scope This article is written to help Beginners and Intermediate understand the structure of Abstract Syntax Tree, Java Parser framework, and Visitor patterns. The above animated diagram shows a partial list of Application Program Interface(API) that are used in this article to demonstrate how Code Smell can be handled with Automation using…

Enable Cross Origin Resource Sharing to Scale and Manage with Client Side Load Balancer — Scope This article is written to help beginners and intermediate learners to understand how an Angular application(Single Page Application) running in a separate server communicates with Microservices deployed in another server. It explains how CORS (Cross-Origin Resource Sharing) can be enabled at Client end to make Angular application communicate with Spring…

Message Oriented Middleware(MOM) and Asynchronous communication —

Kubernetes Rolling Updates & Declarative Deployment — Scope This article explains how to use declarative deployment to create Kubernetes pods and services. It performs rolling updates by pulling updated images from Docker Hub. This exercise is done in Windows 10 Home edition, the Host operating system. As Home edition does not provide Hyper-V, the Type 1 hypervisor, it…

Service Oriented Architecture — SOA — Note to Readers This article was initially published in IBM developerWorks publication during the year June 2013 as shown below. As the links to this article has been moved, I wanted to republish it in MEDIUM to help Beginners and Intermediate who might be interested in this subject.