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


         // Be sure only one arrived
         sleep(5000);
         assertEquals(times.get(), 1);


         MonitorNotification notification = (MonitorNotification)holder.get();
         assertEquals(notification.getType(), MonitorNotification.OBSERVED_ATTRIBUTE_TYPE_ERROR);
      }
      finally
      {
         monitor.stop();
      }

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         // Above threshold, just one notification should be sent
         counter.setIntegerCounter(initThreshold.intValue() + 1);
         sleep(period * 3);
         assertEquals(times.get(), 1);
         MonitorNotification notification = (MonitorNotification)holder.get();
         assertEquals(notification.getType(), MonitorNotification.THRESHOLD_VALUE_EXCEEDED);


         times.set(0);
         holder.set(null);
         sleep(period * 3);
         assertEquals(times.get(), 0);

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         // Above threshold, just one notification should be sent
         counter.setIntegerCounter(initThreshold.intValue() + 1);
         sleep(period * 3);
         assertEquals(times.get(), 1);
         MonitorNotification notification = (MonitorNotification)holder.get();
         assertEquals(notification.getType(), MonitorNotification.THRESHOLD_VALUE_EXCEEDED);
         // The threshold should have offset
         Number threshold = monitor.getThreshold(counterName);
         assertEquals(threshold.intValue(), monitor.getInitThreshold().intValue() + offset.intValue());


         times.set(0);
         holder.set(null);
         sleep(period * 3);
         assertEquals(times.get(), 0);


         // Above threshold by more than 1 offset
         counter.setIntegerCounter(initThreshold.intValue() + offset.intValue() * 2 + 1);
         sleep(period * 3);
         assertEquals(times.get(), 1);
         notification = (MonitorNotification)holder.get();
         assertEquals(notification.getType(), MonitorNotification.THRESHOLD_VALUE_EXCEEDED);
         // The threshold should have offset correctly
         threshold = monitor.getThreshold(counterName);
         assertEquals(threshold.intValue(), monitor.getInitThreshold().intValue() + offset.intValue() * 3);


         times.set(0);

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   public MonitorNotification createMonitorNotification() throws Exception
   {
      Constructor ctor = MonitorNotification.class.getDeclaredConstructor(new Class[]{String.class, Object.class, long.class, long.class, String.class, ObjectName.class, String.class, Object.class, Object.class});
      ctor.setAccessible(true);
      MonitorNotification notification = (MonitorNotification)ctor.newInstance(new Object[]{"type", "source", new Long(13), new Long(System.currentTimeMillis()), "message", new ObjectName("domain:p1=v1"), "attribute", "gauge", "trigger"});
      notification.setUserData("user");
      return notification;
   }

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     * @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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                    o.setStatus(MATCHING);
                }
            }
        }


        return new MonitorNotification(type,
                                       this,
                                       0,
                                       0,
                                       msg,
                                       null,

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


        MonitorNotification n = null;


        // Send notification if notify is true.
        //
        if (!o.getEventAlreadyNotified()) {
            if (((Number)o.getDerivedGauge()).longValue() >=
                o.getThreshold().longValue()) {
                if (notify) {
                    n = new MonitorNotification(THRESHOLD_VALUE_EXCEEDED,
                                                this,
                                                0,
                                                0,
                                                "",
                                                null,

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            return null;


        // Notify the listeners and update the threshold if
        // the updated derived gauge value is valid.
        //
        final MonitorNotification alarm;
        if (o.getDerivedGaugeValid()) {
            alarm = updateNotifications(o);
            updateThreshold(o);
        } else {
            alarm = null;

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                    "\n\tNotification derived gauge = " + derGauge);
        }


        long seqno = sequenceNumber.getAndIncrement();


        MonitorNotification mn =
            new MonitorNotification(type,
                                    this,
                                    seqno,
                                    timeStamp,
                                    msg,
                                    object,

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