| javax.management.monitor.Monitor
 javax.management.monitor.GaugeMonitor
| GaugeMonitor | | public class GaugeMonitor extends Monitor implements GaugeMonitorMBean(Code) | | Defines a monitor MBean designed to observe the values of a gauge attribute.
A gauge monitor observes an attribute that is continuously variable with time.
A gauge monitor sends notifications as follows:
- if the attribute value is increasing and becomes equal to or greater than the high threshold value,
a
MonitorNotification.THRESHOLD_HIGH_VALUE_EXCEEDED threshold high notification is sent.
The notify high flag must be set to
true
Subsequent crossings of the high threshold value do not cause further notifications unless
the attribute value becomes equal to or less than the low threshold value.
- if the attribute value is decreasing and becomes equal to or less than the low threshold value,
a
MonitorNotification.THRESHOLD_LOW_VALUE_EXCEEDED threshold low notification is sent.
The notify low flag must be set to
true.
Subsequent crossings of the low threshold value do not cause further notifications unless
the attribute value becomes equal to or greater than the high threshold value.
This provides a hysteresis mechanism to avoid repeated triggering of notifications when
the attribute value makes small oscillations around the high or low threshold value.
If the gauge difference mode is used, the value of the derived gauge is calculated
as the difference between the observed gauge values for two successive observations.
The derived gauge value (V[t]) is calculated using the following method:
- V[t] = gauge[t] - gauge[t-GP]
This implementation of the gauge monitor requires the observed attribute to be of the type integer or floating-point
(Byte, Integer, Short, Long, Float, Double).
author:
Young Yang |
| Inner Class :class GaugeMonitorData extends MonitorData | |
| getDerivedGaugeTimeStamp | | public long getDerivedGaugeTimeStamp(ObjectName observedObject)(Code) | | |
| getDifferenceMode | | public boolean getDifferenceMode()(Code) | | |
| getNotifyHigh | | public boolean getNotifyHigh()(Code) | | |
| getNotifyLow | | public boolean getNotifyLow()(Code) | | |
| setDifferenceMode | | public void setDifferenceMode(boolean value)(Code) | | |
| setNotifyHigh | | public void setNotifyHigh(boolean value)(Code) | | |
| setNotifyLow | | public void setNotifyLow(boolean value)(Code) | | |
| start | | public void start()(Code) | | |
| Fields inherited from javax.management.monitor.Monitor | protected Map observedObjects(Code)(Java Doc)
|
|
|