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Drools JBoss Rules 5.0 Developer's Guide by Michal Bali, Bogdan Brinzarea

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Architecture

This sample application will consist of three layers. From bottom to top—persistence, service, and presentation. It can be seen in the following diagram. The persistence layer is responsible for storing objects into a database. Transactions guarantee consistency of the database and provide isolation between concurrent requests.

The service layer represents the business logic of this application. It consists of validation service, Complex Event Processing (CEP) service, and loan approval service. Finally, the presentation layer uses these services to provide functionality to users in a user-friendly fashion. The sample application architecture diagram is as follows:

Please note that with some minor configuration changes, the service ...

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