Network Deployment (Distributed operating systems), v8.0 > Applications > Web services > WS-ReliableMessaging


WS-ReliableMessaging - How it works

WAS uses WS-ReliableMessaging as part of the transport layer for SOAP over HTTP messages. The message exchange patterns supported at the API layer are one-way "fire and forget," or two-way request and reply.

The reliability is provided by reliable messaging middleware that sits between the web service requester and the web service provider. This middleware layer is shown beneath the dotted line in the following diagram, and includes the reliable messaging source and the reliable messaging destination.

When using WS-ReliableMessaging with a two-way programming API, if the requesting application fails and is restarted it will not receive its reply message. In this model, WS-ReliableMessaging is being used to protect from network failures only. Moreover:

Figure 1. The interactions used to exchange web services messages reliably.reliable messaging (middleware) source. Within the ultimate receiver box, the application destination receives the message from a reliable messaging (middleware) destination. The SOAP over HTTP message is transmitted by the reliable messaging source to the reliable messaging destination, and the reliable destination sends an acknowledgement message back to the reliable messaging source." />

In the previous diagram, the application source invokes a web service. The sequence of interactions is as follows:

To configure a web service application to use WS-ReliableMessaging, you attach a policy set that contains a WS-ReliableMessaging policy type. This policy type offers a range of qualities of service: managed persistent, managed non-persistent, or unmanaged non-persistent.

The managed qualities of service, managed persistent and managed non-persistent, are supported by the service integration bus. For each attachment between an application and a policy set, you can select the bus and messaging engine to use for the reliable messaging protocol state.
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