6.2 Messaging and Connectivity at the Core | Enterprise Service Bus: Theory in Practice

In Figure 6-3, the series of connected rectangles in the center of the diagram represents the core of the ESB. A key component of this core is a highly scalable enterprise messaging backbone that is capable of asynchronously transporting data as messages in a secure and reliable fashion. The messaging backbone supports the asynchronous store-and-forward capability that was discussed in Chapter 5. This messaging core could represent a proprietary MOM, a MOM based on JMS, or a MOM based on WS-Reliability or WS-ReliableMessaging. Or, the messaging core could be a generic messaging engine that supports any combination of these.

Figure 6-3. Enterprise messaging at the core of the ESB

The service endpoint provides an abstraction away from the underlying protocol (or MOM channel). The ESB allows the underlying protocol to vary depending on the deployment situation and the QoS requirements. The choice of protocol can vary, from proprietary MOM to unreliable HTTP, to WS-Rel*, depending on the criteria for that leg of the trip and the overall QoS requirements of a message flow. From the perspective of the integration architect who is weaving the fabric of integration, the task is to link together service endpoints into process flows. Using administrative tools supplied with the ESB, the technology behind the endpoint definition and the details of the underlying protocol can be dealt with separately, and can even change over time. It is the responsibility of the ESB to map the high-level process flows into individual service invocations across the designated transport.

Table of content

Enterprise Service Bus: Theory in Practice

ISBN: 0596006756
EAN: 2147483647

Year: 2006
Pages: 126

Authors: David Chappell

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