EDA – Event Driven Architecture

Event-driven architecture (EDA) is a push-based communication between publisher and consumer, which predominantly use for proactive notification in real time environment.
For e.g. Fraud notification from credit card Company, shipping, order fulfillment etc.
EDA use to communicate with consumer with minimum or no delay and avoid busy-wait thread stats. Continue reading

Grails – RESTful Webservice using JAX-RS plugin

I discussed about RESTful architecture consideration and how to build RESTful web services using Jersey JAX-RS [JSR 311]  in JAVA. Today I am going to discuss how to build the RESTful web services using Grails framework.

GRAILs framework is the platform which provides end to end solution to build web application from scratch to advance intuitive RIA web application. Grails potentially be a one-stop shop for all your enterprise application development. Grails is modular, allowing you to pick and choose which modules are applicable for your application Continue reading

REST – Representational State Transfer

REST comes from Roy Fielding’s PhD paper, published in 2000, and it stands for Representational state Transfer. REST is set of architectural constrains which can apply on application design to make application more scalable, flexible, reusable, loose couple and align to business agile. Fielding’s REST guideline defines the specific role for data, component, operation, communication protocols, data consumer and producer.

REST is generic constraints for distributed technologies with no limits of technologies or stack.

Following are the constraints that define a RESTful system.

  • Should be for distributed system
  • Data communication should be stateless
  • Request should be independent and reusable
  • It has to support caching.
  • System should be access uniformly accessible
  • Desperate representation of  response
  • Standardize operations

These are independent of technology and represents how data communicate between and what’s guideline need to follow during data transfer between distributed systems.

e.g. Static web is RESTful as it follows fielding’s key guideline on REST. For instance, the existing static web  provide caching, stateless connection, the unique link to resources (HTML). On the other hand, traditional dynamic web applications haven’t always been RESTful, because they typically break some of the outlined constraints. For instance most dynamic application is not stateless.

But we can use abstraction on dynamic system that makes a RESTful system using HTTP protocols, URIs, representation and resources.