I am very new to JBoss rules and I am trying to use it for evaluating alert conditions. I am asserting the AlertDefinition object as a fact into the working memory. The rules file would define a variety of alert condition rules. for example rule "Device not working (condition id = 4)" # the if part when alertDefinition : AlertDefinition (conditionID == 4, eid : entityID) # here i would like to get the last power reading from device # with id == eid eval (dao.getPower(eid).doubleValue() < 1000) # then get temperature from the device eval ((dao.getTemperature(eid) != null && dao.getTemperature(eid) > 50) || (dao.getAmbTemperature(eid) != null && dao.getAmbTemperature(eid) > 40) ) then # what do we do if the rule evaluates to true log("Triggered Device not working alert for " + eid); end Here are my questions: 1. Am using the evals correctly? Can I possibly split this into multiple rules to make it work better? 2. Can assign dao.getTemperature(eid) to a field. The getTemperature call is expensive and doing it twice is not right. Any pointer would be appreciated. -Rahul