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java.lang.Object | +--javax.management.NotificationBroadcasterSupport | +--javax.management.monitor.Monitor | +--javax.management.monitor.CounterMonitor
Defines a monitor MBean designed to observe the values of a counter attribute.
A counter monitor sends a threshold notification
when the value of the counter reaches or exceeds a
threshold known as the comparison level. The notify flag must be set to
true
. In addition, an offset mechanism enables particular
counting intervals to be detected.
If the offset value is not zero, whenever the threshold is triggered by the counter value reaching a comparison level, that comparison level is incremented by the offset value. This is regarded as taking place instantaneously, that is before the count is incremented. Thus, for each level, the threshold triggers an event notification every time the count increases by an interval equal to the offset value.
If the counter can wrap around its maximum value, the modulus needs to be specified. The modulus is the value at which the counter is reset to zero.
If the counter difference mode is used, the value of the derived gauge is calculated as the difference between the observed counter values for two successive observations. If this difference is negative, the value of the derived gauge is incremented by the value of the modulus. The derived gauge value (V[t]) is calculated using the following method:
This implementation of the counter monitor requires the observed attribute
to be of the type integer(Byte,Integer,Short,Long).
Fields inherited from class javax.management.monitor.Monitor |
alreadyNotified,
dbgTag,
OBSERVED_ATTRIBUTE_ERROR_NOTIFIED,
OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED,
OBSERVED_OBJECT_ERROR_NOTIFIED,
RESET_FLAGS_ALREADY_NOTIFIED,
RUNTIME_ERROR_NOTIFIED,
server |
Constructor Summary | |
CounterMonitor()
Default constructor. |
Method Summary | |
java.lang.Number |
getDerivedGauge()
Gets the derived gauge. |
long |
getDerivedGaugeTimeStamp()
Gets the derived gauge timestamp. |
boolean |
getDifferenceMode()
Gets the difference mode flag value. |
java.lang.Number |
getModulus()
Gets the modulus value. |
MBeanNotificationInfo[] |
getNotificationInfo()
Returns a NotificationInfo object containing the name of the Java class of the notification and the notification types sent by the counter monitor. |
boolean |
getNotify()
Gets the notification's on/off switch value. |
java.lang.Number |
getOffset()
Gets the offset value. |
java.lang.Number |
getThreshold()
Gets the threshold value. |
void |
preDeregister()
Allows the counter monitor MBean to perform any operations it needs before being de-registered by the MBean server. |
void |
setDifferenceMode(boolean differenceMode)
Sets the difference mode flag value. |
void |
setModulus(java.lang.Number modulus)
Sets the modulus value. |
void |
setNotify(boolean notify)
Sets the notification's on/off switch value. |
void |
setOffset(java.lang.Number offset)
Sets the offset value. |
void |
setThreshold(java.lang.Number threshold)
Sets the threshold value. |
void |
start()
Starts the counter monitor. |
void |
stop()
Stops the counter monitor. |
Methods inherited from class javax.management.monitor.Monitor |
getGranularityPeriod,
getObservedAttribute,
getObservedObject,
isActive,
postDeregister,
postRegister,
preRegister,
setGranularityPeriod,
setObservedAttribute,
setObservedObject |
Methods inherited from class javax.management.NotificationBroadcasterSupport |
addNotificationListener,
removeNotificationListener,
sendNotification |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Constructor Detail |
public CounterMonitor()
Method Detail |
public void preDeregister() throws java.lang.Exception
public java.lang.Number getDerivedGauge()
public long getDerivedGaugeTimeStamp()
public boolean getDifferenceMode()
public java.lang.Number getModulus()
public MBeanNotificationInfo[] getNotificationInfo()
public boolean getNotify()
public java.lang.Number getOffset()
public java.lang.Number getThreshold()
public void setDifferenceMode(boolean differenceMode)
differenceMode
- public void setModulus(java.lang.Number modulus) throws java.lang.IllegalArgumentException
modulus
- the new modulus valuepublic void setNotify(boolean notify)
notify
- the on/off flagpublic void setOffset(java.lang.Number offset) throws java.lang.IllegalArgumentException
offset
- the new offsetpublic void setThreshold(java.lang.Number threshold) throws java.lang.IllegalArgumentException
threshold
- the new thresholdpublic void start()
public void stop()
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