As organizations move towards service oriented architectures, which hosts various deployed services, they require a infrastructure service that will facilitate cross-platform interoperability while providing common communication and integration services. The ESB integrates applications, coordinates resources, and manipulates information. What's unique about the ESB approach is that it enables the connection of software that runs parallel on different platforms, written in different programming languages and using different programming models.

Typical architecture of an Enterprise Service Bus

The architecture of an ESB as its name suggests is centered on a bus. Message delivery services are provided by the ESB based on standards like SOAP, HTTP and Java™ Messaging Service (JMS). Typically designed for high throughput, an ESB promises guaranteed message delivery to a variety of service providers and consumers. The use of multiple protocols such as synchronous and asynchronous are enabled and aid in performing transformation and routing of service requests. Supporting different standards such as SOAP, XML, WSDL, JMS, J2EE, JAX-RPC etc, the ESB enables services to interact with each other.

The component types that can connect to an ESB are:

1. Custom applications, based on standards like J2EE and Struts, which plug into the ESB to      provide a user interface to enterprise services

2. Service orchestration engine, which hosts long running business processes, based on      standards like Business Process Execution Language (BPEL).

3. Adapters, typically built to the Java Connector Architecture (JCA) specification, enable      integration with a wide variety of enterprise applications.
4. Presentation and portals enable the creation of personalized portals that aggregateservices       from multiple sources.

5. Data services which provides real time view of data from heterogeneous data sources.

6. Web Services provides a standard means of connectivity to legacy and proprietary integration       technologies.

Next in this series is, ESB - Use case Scenario

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