Chapter 4 Guaranteed Message Delivery

Under normal operation in SmartSockets, all messages sent through connections are delivered successfully and processed in a timely manner. If a network failure occurs, though, data can be lost. For some applications, such as bank transactions or Internet commerce, missed messages or duplicate messages are unacceptable. The features described in Handling Network Failures allow connections to detect network failures and initiate recovery. Guaranteed message delivery (GMD) fully recovers from these failures and ensures that messages are transmitted as needed.

The first part of this chapter describes the features of connections that implement GMD. The second part of this chapter describes the additional features you get when you use GMD with publish-subscribe. For a discussion of the GMD features specific to RTserver and RTclient that add more function, such as RTserver continuing to buffer messages for RTclient processes that have temporarily failed, see Publish-Subscribe and GMD.

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