Initially when organization was going to webservice they were getting issue with integration, orchestration, communication, transaction with services etc. Whenever they were making any change in vendor or services, this change was propagating to code and application. It was big change management for any small change in business or vendor services. It was also taking long time and resources to make any change in business or vendor services. There was no clear SLA (Service Level Agreement) between consumer and service provider.
ESB (Enterprise Service Bus) gave major contribution to overcome all these issues. ESB is back bone of SOA. It provides pluggable architecture which enables easy decoupling of producer from consumer. It is an extension of EAI (Enterprise Application Integration), an earlier version of middleware, but it adds several other features. ESB is XML based technology. You can define end point, routing rule of message, transaction, or security in xml without doing any line of coding. ESB has clear SLA (Service Level Agreement) between consumer and service provider. Here are the main features of ESB.
1. Service Virtualization – ESB provides loosely couple architecture. You can couple or decouple your services without touching any part of code or services. In ESB you can define end point for each services and their routing rule. You can easily add or remove these services from ESB. Service virtualization gives an ability to define abstract service end point instead of using actual physical address.
2. Service Enablement – Organization were struggling to enable legacy system as services. ESB adapter such as JDBC adapter, Mainframe adapter etc., gives more flexibility to create SOAP based Webservice of any organization. This functionality reduces your IT investments and you can reuse your existing system.
3. Asynchronous Communication – ESB is the key infrastructure for message process and rerouting. ESB provides the platform for asynchronous message with intelligent transformation and rerouting to ensure messages are passed reliably. Services participate in the ESB using either Web services messaging standard or the JMS (Java Messaging System).
4. Protocol Bridging – ESB provides bridging between inbound message and out bound message. Like ESB gets inbound message as HTTP protocol and send to outbound as JMS protocol in one message flow. Both inbound message and outbound message communicate each other without knowing each other protocols.
Rajnish Kumar is CTO of Vanrish Technology with Over 25 years experience in different industries and technology. He is very passionate about innovation and latest technology like APIs, IOT (Internet Of Things), Artificial Intelligence (AI) ecosystem and Cybersecurity. He present his idea in different platforms and help customer to their digital transformation journey.