WebSphere brand IBM WebSphere Sensor Events, Version 6.2

Rules

This topic explains different types of rules and how they trigger Location Awareness Services for WebSphere® Sensor Events events.

Rules define conditions and policies that need to be met. For example, rules can be used to restrict access to certain zones or to limit the amount of time an item stays in a zone. Business rules are implemented based on a generic Complex Event Processing (CEP) engine which facilitates the development of additional rule types. Events (alerts) occur when rules are violated. Events are published and saved in the event database. Subscriber programs can subscribe to Location Awareness Services for WebSphere Sensor Events events. Violations of rules related to items can also be displayed in the Spatial Management Client.

Location Awareness Services for WebSphere Sensor Events rules typically refer to the aspects of the real world as it is modeled in Location Awareness Services for WebSphere Sensor Events - items and persons equipped with tags and the topology of the location to be monitored. Some basic rule types are supported by Location Awareness Services for WebSphere Sensor Events and you can use portlet-based user interfaces to create instances of these rule types. An example of a rule type is "must not enter" whereas an example of a related rule instance is "members of the Visitor class must not enter protected zones".

When you define a rule, you can check for future events, but not for events that have already happened. This means that you cannot define an rule for conditions that have already occurred.

The following rules are related to zones and can be set and maintained in the Business Rules portlet in the WebSphere Application Server administrative console:

The following global rule types do not have different instances, but can be customized in the System Properties portlet in the Location Awareness Services for WebSphere Sensor Events Administrative Console:


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