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The Publish/Subscribe Coordination Design Pattern

The Publish/Subscribe Coordination Design Pattern. Günter Grossberger. Overview. Motivation CORSO Middleware Properties of the Publish/Subscribe Coordination Design Pattern Reliable Information Dissemination Scalability Summary. Publish/Subscribe Systems.

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The Publish/Subscribe Coordination Design Pattern

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  1. The Publish/Subscribe Coordination Design Pattern Günter Grossberger

  2. Overview • Motivation • CORSO Middleware • Properties of the Publish/Subscribe Coordination Design Pattern • Reliable Information Dissemination • Scalability • Summary

  3. Publish/Subscribe Systems • MQSeries, TIBCO/Rendezvous, NDDS, Minstrel • Most based on expiry • Best effort information dissemination • Not suited for business applications

  4. CORSO Middleware

  5. Properties of the Publish/Subscribe Coordination Design Pattern • Subscription • Asynchronous communication • Content selection • Open system • Mobile/offline operation • Secure (authentication, encryption) • Synchronization possible at Subscription

  6. Reliable Information Dissemination • Every Subscriber acknowledges every processed PublishItem • Garbage Collector gives feedback to application

  7. Reliable Information Dissemination • Combination of unreliable and reliable objects • Application is returned a recovery status • Recovery status depends on accessible objects:

  8. Scalability • Transparent Proxy component • Reduces network traffic • Utilizes CORSO distribution strategy • Acknowledges processing for whole subtree • Multiple layers of Proxies

  9. Conclusion • Asynchronous communication • Open system • Reliable information dissemination • Scalability (Proxy)  The Publish/Subscribe Coordination Design Pattern is a highly useful tool for the development or integration of business applications

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