Examples of javax.management.monitor.MonitorNotification

javax.management.monitor.MonitorNotification
A notification from one of the monitor services.
The notification occurs only when the state is first entered.
All monitor services produce the following notifications.
- {@link #OBSERVED_OBJECT_ERROR} when the MBean is not registered.
- {@link #OBSERVED_ATTRIBUTE_ERROR} when the MBean's attribute doesnot exist.
- {@link #OBSERVED_ATTRIBUTE_TYPE_ERROR} when the MBean's attribute isnot of the correct type for the monitor or the derived gauge value.
- {@link #RUNTIME_ERROR} for any other error.
The counter monitor produces the following notifications.
- {@link #THRESHOLD_ERROR} when one of the monitors threshold vaues is of an incorrect type.
- {@link #THRESHOLD_VALUE_EXCEEDED} when the counter exceeds the threshold.
The gauge monitor produces the following notifications.
- {@link #THRESHOLD_ERROR} when one of the monitors threshold vaues is of an incorrect type.
- {@link #THRESHOLD_HIGH_VALUE_EXCEEDED} when the attribute exceedsthe high threshold value.
- {@link #THRESHOLD_LOW_VALUE_EXCEEDED} when the attribute exceedsthe low threshold value.
The string monitor produces the following notifications.
- {@link #STRING_TO_COMPARE_VALUE_DIFFERED} when the attribute no longermatches the specified value.
- {@link #STRING_TO_COMPARE_VALUE_DIFFERED} when the attribute matches the specified value.
@author Adrian Brock @version $Revision: 1.2 $
Revisions:
20020816 Adrian Brock:
- Serialization

     * @param o The observed object.
     */
    private synchronized MonitorNotification updateNotifications(
        GaugeMonitorObservedObject o) {


        MonitorNotification n = null;


        // Send high notification if notifyHigh is true.
        // Send low notification if notifyLow is true.
        //
        if (o.getStatus() == RISING_OR_FALLING) {
            if (isFirstGreaterThanLast((Number)o.getDerivedGauge(),
                                       highThreshold,
                                       o.getType())) {
                if (notifyHigh) {
                    n = new MonitorNotification(
                            THRESHOLD_HIGH_VALUE_EXCEEDED,
                            this,
                            0,
                            0,
                            "",
                            null,
                            null,
                            null,
                            highThreshold);
                }
                o.setStatus(FALLING);
            } else if (isFirstGreaterThanLast(lowThreshold,
                                              (Number)o.getDerivedGauge(),
                                              o.getType())) {
                if (notifyLow) {
                    n = new MonitorNotification(
                            THRESHOLD_LOW_VALUE_EXCEEDED,
                            this,
                            0,
                            0,
                            "",
                            null,
                            null,
                            null,
                            lowThreshold);
                }
                o.setStatus(RISING);
            }
        } else {
            if (o.getStatus() == RISING) {
                if (isFirstGreaterThanLast((Number)o.getDerivedGauge(),
                                           highThreshold,
                                           o.getType())) {
                    if (notifyHigh) {
                        n = new MonitorNotification(
                                THRESHOLD_HIGH_VALUE_EXCEEDED,
                                this,
                                0,
                                0,
                                "",
                                null,
                                null,
                                null,
                                highThreshold);
                    }
                    o.setStatus(FALLING);
                }
            } else if (o.getStatus() == FALLING) {
                if (isFirstGreaterThanLast(lowThreshold,
                                           (Number)o.getDerivedGauge(),
                                           o.getType())) {
                    if (notifyLow) {
                        n = new MonitorNotification(
                                THRESHOLD_LOW_VALUE_EXCEEDED,
                                this,
                                0,
                                0,
                                "",

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            return null;


        // Notify the listeners if the updated derived
        // gauge value is valid.
        //
        final MonitorNotification alarm;
        if (o.getDerivedGaugeValid())
            alarm = updateNotifications(o);
        else
            alarm = null;
        return alarm;

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    public void handleNotification(Notification notification, Object handback) {
        echo(">>> Received notification: " + notification);
        if (notification instanceof MonitorNotification) {
            String type = notification.getType();
            if (type.equals(MonitorNotification.RUNTIME_ERROR)) {
                MonitorNotification mn = (MonitorNotification) notification;
                echo("\tType: " + mn.getType());
                echo("\tTimeStamp: " + mn.getTimeStamp());
                echo("\tObservedObject: " + mn.getObservedObject());
                echo("\tObservedAttribute: " + mn.getObservedAttribute());
                echo("\tDerivedGauge: " + mn.getDerivedGauge());
                echo("\tTrigger: " + mn.getTrigger());
                messageReceived = true;
            }
        }
    }

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/* 190 */       runMonitor((ObservedObject)i.next());
/*     */   }
/*     */ 
/*     */   void sendNotification(ObservedObject object, String type, long timestamp, String message, String attribute, Object gauge, Object trigger)
/*     */   {
/* 207 */     MonitorNotification n = this.callback.createNotification(type, this.monitorName, timestamp, message, gauge, attribute, object.getObjectName(), trigger);
/*     */ 
/* 210 */     this.monitor.sendNotification(n);
/*     */   }

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    * @param trigger the trigger value.
    */
   void sendNotification(ObservedObject object, String type, long timestamp, String message,
      String attribute, Object gauge, Object trigger)
   {
      MonitorNotification n = callback.createNotification(type,
         monitorName, timestamp, message, gauge, attribute,
         object.getObjectName(), trigger);
      monitor.sendNotification(n);
   }

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