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This chapter is from the book

Architecting Complex-Event Processing Solutions with TIBCO®Architecting Complex-Event Processing Solutions with TIBCO®

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This chapter is from the book

This chapter is from the book

Architecting Complex-Event Processing Solutions with TIBCO®Architecting Complex-Event Processing Solutions with TIBCO®

Learn More Buy

Orchestrated Response

While process orchestration is not a traditional focus of complex-event processing, the need to orchestrate portions of CEP solution activity is increasing in importance (Figure 3-14). In this relatively common pattern, process orchestration is used to coordinate multiple participants in responding to a situation. The reason for the orchestration is twofold: to control the order in which the actions are performed and to confirm the successful completion of the actions. Less common is a situation in which process coordination is required for situation recognition.

Figure 3-14

Figure 3-14: Response Orchestration Pattern

This pattern is a hybrid of event-driven and request-driven interactions. All of the interactions up to the receipt of the situation recognition announcement are event driven. The response orchestration component, however, uses request-driven interactions to not only request that each participant perform its work but also to confirm the successful completion of that work.

When this pattern is used, a choice must be made regarding the type of technology to be used for the response orchestration. Traditionally, this would be a component designed specifically for process orchestration, such as TIBCO ActiveMatrix BusinessWorks™ or TIBCO ActiveMatrix® BPM. With this approach, if rule-based reasoning is required in the orchestration, the Decision-as-a-Service pattern is used. The service returns values that then guide the subsequent process execution.

However, separating process orchestration from complex-event processing may become a performance barrier, particularly if a significant amount of repetitive information must be passed to the decision service on each invocation. In such cases, it is better to have the process orchestration performed directly by a CEP component. This is the purpose of the TIBCO BusinessEvents® Process Orchestration product. It adds process orchestration capabilities to TIBCO BusinessEvents®.

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