Implementing Business Rules in Java

 

     Listing 1
     public void correlateAlarm ( Alarm alarm )
     {
     //Related Alarms
     //When a switch raises an equipment failure alarm ignore all
     //communication failure alarms on the associated port.
     if ((alarm.type == Alarm.Type.CommunicationFailure)
     && (alarm.managedObject.type ==
     NetworkElement.Type.Port))
     {
     // search for Equip failure on Switch
     AlarmList alarms = GetHistoryAlarmList();
     for (Alarm a = alarms.firstElement();
     alarms.hasMoreElements(); a = alarms.nextElement())
     if ((a.type == Alarm.Type.EquipmentFailure)
     && (alarm.managedObject.type == NetworkEle-
     ment.Type.Switch)
     && (a.managedObject.node == alarm.managedObject)) {
     alarm.terminate(
     "Terminated Communication Failure on Port
     due to Equipment Failure on the Switch " +
     alarm.managedObject.id);
     return;
     }
     }
     //Maintenance Activity Scheduled
     //When maintenance activity has been scheduled on a net-
     //work element ignore all alarms raised on this piece
     //of hardware between the maintenance start and end time.
     MaintenanceActivityList activities = GetMaintenanceActiv-
     ityList(alarm.managedObject);
     for (MaintenanceActivity maintenance =
     activities.firstElement();
     activities.hasMoreElements(); maintenance = activi-
     ties.nextElement())
     if ((alarm.time >= maintenance.startTime)
     && (alarm.time <= maintenance.endTime) {
     alarm.terminate("Terminated due to a maintenance
     activity on "
     + alarm.managedObject.id);
     return;
     }
     // Critical Alarms on Sensitive Devices
     // When more than 15 alarms are detected on a Network Element,
     // notify the Network Operator by Pager.
     // When more than 5 alarms are detected on a Switch,
     // notify the Network Operator by Pager.
     AlarmList alarms = GetHistoryAlarmList();
     int count = 0;
     int countOnSwitch = 0;
     for (Alarm a = alarms.firstElement();
     alarms.hasMoreElements(); a = alarms.nextElement()) {
     if (alarm.managedObject == a.managedObject) {
     count++;
     if (alarm.managedObject.type ==
     NetworkElement.Type.Switch)
     countOnSwitch++;
     }
     }
     if (count > 15)
     network.pageOperator("More than 15 alarms on the NE " +
     alarm.managedObject.id);
     else if (countOnSwitch > 5)
     network.pageOperator("More than 5 alarms on the Switch " +
     alarm.managedObject.id);
     } // public void correlateAlarm
     Listing 2
     //Related Alarms
     //When a switch raises an equipment failure alarm ignore all
     //communication failure alarms on the associated port.
     rule Port_CommunicationFailure_due_to_Switch_EquipmentFailure
     {
     priority = maximum;
     when
     {
     ?alarm: Alarm(type == Alarm.Type.EquipmentFailure);
     ?switch: Switch() from ?alarm.managedObject;
     ?comm: Alarm(type == Alarm.Type.CommunicationFailure);
     Port(node == ?switch) from ?comm.managedObject;
     }
     then
     {
     modify ?comm
     {
     terminate("Terminated Communication Failure on Port due
     to Equipment Failure on a Switch");
     }
     }
     };
     //Maintenance Activity Scheduled
     //When maintenance activity has been scheduled on a network
     //element ignore all alarms raised on this piece of hardware //between
     the maintenance start and end time.
     rule Terminate_Alarms_During_Maintenance
     {
     priority = high;
     when
     {
     ?maintenance: MaintenanceActivity();
     ?alarm: Alarm(managedObject == ?maintenance.managedObject ; time >=
     ?maintenance.startTime ; time <= ?maintenance.endTime);
     }
     then
     {
     modify ?alarm
     {
     terminate("Terminated due to a maintenance window on " +
     ?maintenance.managedObject.id);
     }
     }
     };
     // Critical Alarms on Sensitive Devices
     // When more than 15 alarms are detected on a Network Element,
     // notify the Network Operator by Pager.
     // When more than 5 alarms are detected on a Switch,
     // notify the Network Operator by Pager.
     rule Page_Operator_When_Critical_Alarm_On_Network_Element
     {
     when
     {
     ?n: Network();
     ?networkElement: NetworkElement();
     collect Alarm(managedObject == ?networkElement)
     where (size() >15);
     }
     then
     {
     ?n.pageOperator("More that 15 alarms on the NE " + ?net
     workElement.id);
     }
     };
     rule Page_Operator_When_Critical_Alarm_On_Switch
     {
     when
     {
     ?n: Network();
     ?switch: Switch();
     collect Alarm(managedObject == ?switch)
     where (size() > 5);
     }
     then
     {
     ?n.pageOperator("More that 5 alarms on the Switch" + ?switch.id);
     }
     };