WS-Notification: Benefits

WS-Notification enables web services to use the publish and subscribe messaging pattern. This approach offers many business benefits.

WS-Notification provides a standardized approach for web service applications to participate in the publish and subscribe messaging pattern, whether this be listening for notification of a particular event occurrence, or inserting event notifications into the system for consumption by other applications or system management tooling. The open-standards nature of this web services specification mean that applications can communicate with each other irrespective of the underlying hardware platforms, software languages or vendor environments. The WS-Notification implementation in WebSphere® Application Server supports the WS-Notification standards, complies with the WS-I Basic Profile 1.0 requirements, and composes with other related standards such as WS-Addressing for High Availability and Workload Management, and WS-ReliableMessaging for reliable communication between components.

Within WebSphere Application Server, the NotificationBroker is implemented to provide flexible support for enterprise topologies including high availability and work load management patterns. This support for WS-Notification also allows interchange of event notification between WS-Notification applications and other clients of the service integration bus. By exploiting other service integration bus functions you can also use this function to interchange messages with other IBM publish and subscribe brokers such as WBI Event Broker or Message Broker.

Rather than receiving all messages on a topic to which you have subscribed, your consuming application can use XML Path (XPath) selectors to filter the messages based upon the contents of each message. This content-based subscription gives greater flexibility in defining the type of information that you want to receive, your applications can use it to avoid responsibility for their own filtering, and it improves performance by not flowing messages unnecessarily from the server to the application.

This implementation includes two versions of the WS-Notification service and service points:

Version 7.0 WS-Notification services and service points allow you to use web services-based publish/subscribe messaging in a reliable way, through a standards-based connection mechanism, in an environment where network connectivity is not always available. For example, if you want to use the Internet to send warehouse or stock level notifications to remote customers, you must ensure that messages reach customers reliably so that they have accurate stock levels for sales and production planning. You can achieve this by composing Version 7.0 WS-Notification services (for stock level notification) with WS-ReliableMessaging (to ensure reliable delivery of notifications).

You can also expose a non-reliable Version 7.0 WS-Notification service. The main benefits of this over a Version 6.1 WS-Notification service are as follows:
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Last updated: Oct 22, 2010 12:21:29 AM CDT
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