Implement two-way communication among ESB components

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Tutorial: Implement two-way communication among ESB components

The Loan Broker example bundled with ServiceMix demonstrates how component-to-component interaction happens in an enterprise service bus, as specified by the Java Business Integration specification.

Tutorial Details:

The Java Business Integration specification (JBI) defines a standard for building system integration applications using Web Services Description Language (WSDL) and XML-based messaging. JBI therefore aims to standardize the business-to-business integration space that was, until JBI, served by non-standardized products. Now, clients can use a JBI-compliant enterprise service bus (ESB) built by a vendor as a bundle of services that can integrate seamlessly with other services (even if developed by other vendors), as long as they adhere to the JBI specification—an impossibility before the JBI.

In this article, we look at how component-to-component interactions happen in a JBI-compliant way over an ESB, using the Loan Broker example bundled with the open source ESB ServiceMix.

The primary focus of the JBI specification is to define standards in the following areas:

1. API and architecture for business-component-to-business-component interaction
2. Defined deployment descriptors and package mechanisms for business components and service units
3. Monitoring and management of the lifecycle of services deployed on an enterprise service bus

JBI introduces the concept of a normalized message router (NMR), which is the backbone of all communication that happens within the ESB. As per the JBI-defined architecture, the ESB can be viewed as a conglomeration of distributed services that interact with each other to provide services to external clients. The JBI also defines a set of message exchange patterns (MEPs) based on which services (provided through components) can communicate with each other over the NMR.

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