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Java Source Code / Java Documentation » JMX » XMOJO » javax.management.monitor

Source Cross Reference Class Diagram Java Document (Java Doc)

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).

Inner Class :class GaugeMonitorThread implements Runnable

Constructor Summary
public	GaugeMonitor() Default Constructor.

Method Summary
public java.lang.Number	getDerivedGauge() This method gets the value of the derived gauge.
public long	getDerivedGaugeTimeStamp() This method gets the value of the derived gauge time stamp.The derived gauge time stamp* is the value(in the nearest miliseconds) when the notification was triggered.
public boolean	getDifferenceMode() This method gets the value of the difference mode.
public java.lang.Number	getHighThreshold() This method gets the value of the high threshold.
public java.lang.Number	getLowThreshold() This method gets the value of the low threshold.
public MBeanNotificationInfo[]	getNotificationInfo() This method returns a NotificationInfo object containing the name of the Java class of the notification and the notification types sent by the counter monitor.
public boolean	getNotifyHigh() This method gets the high notification's on/off switch value.
public boolean	getNotifyLow() This method gets the low notification's on/off switch value.
public ObjectName	preRegister(MBeanServer server, ObjectName name) Overriding the preRegister() of MBeanRegistration interface to store the ObjectName locally.
public void	setDifferenceMode(boolean value) This method sets the state of the difference mode.
public void	setNotifyHigh(boolean value) This method sets the high notification's on/off switch value.
public void	setNotifyLow(boolean value) This method sets the low notification's on/off switch value.
public void	setThresholds(Number highValue, Number lowValue) This method sets the high threshold and low threshold values.
public void	start() Starts the Gauge monitor.
public void	stop() Stops the Gauge Monitor.

Constructor Detail

GaugeMonitor
public GaugeMonitor()(Code)
	Default Constructor.

Method Detail

getDerivedGauge
public java.lang.Number getDerivedGauge()(Code)
	This method gets the value of the derived gauge. The derived gauge is either the exact value of the observed attribute, or the difference between the two consecutive observed values of the attribute. An instance of java.lang.Number giving the value of the derived gauge.

getDerivedGaugeTimeStamp
public long getDerivedGaugeTimeStamp()(Code)
	This method gets the value of the derived gauge time stamp.The derived gauge time stamp* is the value(in the nearest miliseconds) when the notification was triggered. long value representing the time the notification was triggered.

getDifferenceMode
public boolean getDifferenceMode()(Code)
	This method gets the value of the difference mode. If the difference mode is true, the difference mode option is set to calculate the value of the derived gauge. boolean value indicating whether the difference mode option is set.

getHighThreshold
public java.lang.Number getHighThreshold()(Code)
	This method gets the value of the high threshold. An instance of java.lang.Number giving the value of the high threshold.

getLowThreshold
public java.lang.Number getLowThreshold()(Code)
	This method gets the value of the low threshold. An instance of java.lang.Number giving the value of the low threshold.

getNotificationInfo
public MBeanNotificationInfo[] getNotificationInfo()(Code)
	This method returns a NotificationInfo object containing the name of the Java class of the notification and the notification types sent by the counter monitor. An Array of MBeanNotificationInfo objects.

getNotifyHigh
public boolean getNotifyHigh()(Code)
	This method gets the high notification's on/off switch value. true if the gauge monitor notifies when exceeding the highthreshold, false otherwise.

getNotifyLow
public boolean getNotifyLow()(Code)
	This method gets the low notification's on/off switch value. true if the gauge monitor notifies when exceeding the lowthreshold, false otherwise.

preRegister
public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception(Code)
	Overriding the preRegister() of MBeanRegistration interface to store the ObjectName locally.

setDifferenceMode
public void setDifferenceMode(boolean value)(Code)
	This method sets the state of the difference mode. Parameters: value - boolean value representing the state of the difference mode.

setNotifyHigh
public void setNotifyHigh(boolean value)(Code)
	This method sets the high notification's on/off switch value. Parameters: value - - The high notification's on/off switch value.

setNotifyLow
public void setNotifyLow(boolean value)(Code)
	This method sets the low notification's on/off switch value. Parameters: value - - The low notification's on/off switch value.

setThresholds
public void setThresholds(Number highValue, Number lowValue) throws IllegalArgumentException(Code)
	This method sets the high threshold and low threshold values. Parameters: highValue - - The high threshold value. Parameters: lowValue - - The low threshold value. exception: java.lang.IllegalArgumentException - - The specified high/lowthreshold is null or the low threshold is greater than thehigh threshold or the high threshold and the low thresholdare not of the same type.

start
public void start()(Code)
	Starts the Gauge monitor.

stop
public void stop()(Code)
	Stops the Gauge Monitor.

Fields inherited from javax.management.monitor.Monitor

final protected static int OBSERVED_ATTRIBUTE_ERROR_NOTIFIED(Code)(Java Doc)
final protected static int OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED(Code)(Java Doc)
final protected static int OBSERVED_OBJECT_ERROR_NOTIFIED(Code)(Java Doc)
final protected static int RESET_FLAGS_ALREADY_NOTIFIED(Code)(Java Doc)
final protected static int RUNTIME_ERROR_NOTIFIED(Code)(Java Doc)
protected int alreadyNotified(Code)(Java Doc)
protected int alreadyNotifieds(Code)(Java Doc)
final protected static int capacityIncrement(Code)(Java Doc)
protected String dbgTag(Code)(Java Doc)
protected int elementCount(Code)(Java Doc)
protected MBeanServer server(Code)(Java Doc)

Methods inherited from javax.management.monitor.Monitor

public void addObservedObject(ObjectName objectName) throws IllegalArgumentException(Code)(Java Doc)
public boolean containsObservedObject(ObjectName objectName)(Code)(Java Doc)
abstract MX4JMonitor createMX4JMonitor()(Code)(Java Doc)
public long getGranularityPeriod()(Code)(Java Doc)
synchronized MX4JMonitor getMX4JMonitor()(Code)(Java Doc)
public String getObservedAttribute()(Code)(Java Doc)
public ObjectName getObservedObject()(Code)(Java Doc)
public ObjectName[] getObservedObjects()(Code)(Java Doc)
public boolean isActive()(Code)(Java Doc)
public void postDeregister()(Code)(Java Doc)
public void postRegister(Boolean registrationDone)(Code)(Java Doc)
public void preDeregister() throws Exception(Code)(Java Doc)
public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception(Code)(Java Doc)
public void removeObservedObject(ObjectName objectName)(Code)(Java Doc)
public void setGranularityPeriod(long period) throws java.lang.IllegalArgumentException(Code)(Java Doc)
public void setObservedAttribute(String attribute) throws java.lang.IllegalArgumentException(Code)(Java Doc)
public void setObservedObject(ObjectName objectName) throws java.lang.IllegalArgumentException(Code)(Java Doc)
abstract public void start()(Code)(Java Doc)
abstract public void stop()(Code)(Java Doc)

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