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h2. Order of Relevancy Filtering (Hierarchical Filtering)



h3. Technical Complexity

Simple

h3. Purpose

* Allow the listener to receive only the root event of a system change.

h3. Situation

* In a telecommunication environment, application are routed through a network of switched and miscellaneous communication equipments. When a switch goes down, applications must be routed through another switch, but a crew has to be dispatched to fix the faulty equipment. To do that, we must be able to capture all system events, but to only forward the root event (which switch is down) to the service crew.

h3.


h3. Design


h4. Node Model


h4. Implementation Model



h3. IEP Constructs Used


h4. Process Flow
!HProcessFlow.PNG!
 
* Inbound stream
* Projection and Filter of root causes
* Outbound Stream

h4. Projection and Filter of Root Causes
!FilterOperation.PNG|thumbnail!\\

h3. Construction


h4. EJB Functionality (Recursive state change)


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Sample Files
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h3. Example Limitations


h2. Labels
topic-iepse, component-jbi

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