Abstract Syntax Tree and Java Parser Framework
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 Visitor patterns.
The article is backed with live hands-on example [GitHub]specifically written and tested to explain how various components interact and their purpose. Screen shot capture and explanations are provided to help understand the nuance.
Prerequisite (minimum)
If the reader wish to try it out, here are the prerequisite!
a. Spring Boot…
HTTP Upgrade along SOCK JS
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
Prerequisite
a. kafka_2.13–2.8.0
b. Offset Explorer 2.0 (Kafka tool)
c. Spring boot
What is WebSocket ? and the advantages we see over HTTP ?
HTTP is synchronous and is based on PULL paradigm. In a PULL paradigm the client has to initiate a request and poll the server for receiving new data, which is half-duplex and unidirectional. …
Publish-Subscribe Messaging system patterns: TOPIC Persistence
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 Single Node-Multiple Brokers in cluster architecture with Spring boot stack
e. Create TOPIC
Prerequisite
a. kafka_2.13–2.8.0
b. Spring boot
Terminology, a glance
Implement OIDC Platform + OAuth 2.0 + WSO2 API Manager
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. Id token, Access token, X-JWT-Assertion propagation to protected microservices developed using Spring boot / Spring framework.
e. Proof of Concept developed, and tested.
Prerequisite
a. OKTA, as Identity provider. A developer account would suffice.
b. WSO2 API Manager v3.2.0, as API Gateway. Free product download available.
c. Microservices development using Spring…
Learn Kerberos v5 with Spring Security: IAM
Seamless SPNEGO HTTP Authentication
Spring Cloud Netflix and Microservices
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 Boot stack by taking advantage of Spring Cloud Netflix components for routing, client side load balancing, service discovery, and invoking microservices.
The above animated diagram shows the architecture and sequence of actions which this article will explain in detail with the help of code written specifically for this article. …
Queues: Point to Point Messaging
Message Oriented Middleware(MOM) and Asynchronous communication
Hosted Hypervisor: Type 2 + MicroK8s + Docker Hub
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 requires Oracle Virtual Box as hosted Type 2 hypervisor, to be installed to spin virtual machines with Ubuntu Operating system as Guest in VM.
To try out this exercise, the reader is required to have ANY of the following:
Option 1. Unix/Linux flavor OS, to install Docker, and Kubernetes. (Non-Windows)
(or)
Option 2…
Connect IBM WebSphere Service Registry and Repository (WSRR) with IBM Process Server
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.
Design User centric and System centric components
Use IBM MobileFirst Platform Foundation through Secure Sockets Layer with IBM BPM Advanced
Note to Readers
This article was initially published in IBM developerWorks publication during the year June 2015 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.
