- All Implemented Interfaces:
MBeanRegistration
,CounterMonitorMBean
,MonitorMBean
,NotificationBroadcaster
,NotificationEmitter
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:
- if (counter[t] - counter[t-GP]) is positive then V[t] = counter[t] - counter[t-GP]
- if (counter[t] - counter[t-GP]) is negative then V[t] = counter[t] - counter[t-GP] + MODULUS
Byte
,
Integer
, Short
, Long
).- Since:
- 1.5
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Field Summary
Fields declared in class javax.management.monitor.Monitor
alreadyNotified, alreadyNotifieds, capacityIncrement, dbgTag, elementCount, OBSERVED_ATTRIBUTE_ERROR_NOTIFIED, OBSERVED_ATTRIBUTE_TYPE_ERROR_NOTIFIED, OBSERVED_OBJECT_ERROR_NOTIFIED, RESET_FLAGS_ALREADY_NOTIFIED, RUNTIME_ERROR_NOTIFIED, server
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionDeprecated.getDerivedGauge
(ObjectName object) Gets the derived gauge of the specified object, if this object is contained in the set of observed MBeans, ornull
otherwise.long
Deprecated.As of JMX 1.2, replaced bygetDerivedGaugeTimeStamp(ObjectName)
long
getDerivedGaugeTimeStamp
(ObjectName object) Gets the derived gauge timestamp of the specified object, if this object is contained in the set of observed MBeans, or0
otherwise.boolean
Gets the difference mode flag value common to all observed MBeans.Gets the initial threshold value common to all observed objects.Gets the modulus value common to all observed MBeans.Returns aNotificationInfo
object containing the name of the Java class of the notification and the notification types sent by the counter monitor.boolean
Gets the notification's on/off switch value common to all observed MBeans.Gets the offset value common to all observed MBeans.Deprecated.As of JMX 1.2, replaced bygetThreshold(ObjectName)
getThreshold
(ObjectName object) Gets the current threshold value of the specified object, if this object is contained in the set of observed MBeans, ornull
otherwise.void
setDifferenceMode
(boolean value) Sets the difference mode flag value common to all observed MBeans.void
setInitThreshold
(Number value) Sets the initial threshold value common to all observed objects.void
setModulus
(Number value) Sets the modulus value common to all observed MBeans.void
setNotify
(boolean value) Sets the notification's on/off switch value common to all observed MBeans.void
Sets the offset value common to all observed MBeans.void
setThreshold
(Number value) Deprecated.As of JMX 1.2, replaced bysetInitThreshold(java.lang.Number)
void
start()
Starts the counter monitor.void
stop()
Stops the counter monitor.Methods declared in class javax.management.monitor.Monitor
addObservedObject, containsObservedObject, getGranularityPeriod, getObservedAttribute, getObservedObject, getObservedObjects, isActive, postDeregister, postRegister, preDeregister, preRegister, removeObservedObject, setGranularityPeriod, setObservedAttribute, setObservedObject
Methods declared in class javax.management.NotificationBroadcasterSupport
addNotificationListener, handleNotification, removeNotificationListener, removeNotificationListener, sendNotification
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods declared in interface javax.management.monitor.MonitorMBean
addObservedObject, containsObservedObject, getGranularityPeriod, getObservedAttribute, getObservedObject, getObservedObjects, isActive, removeObservedObject, setGranularityPeriod, setObservedAttribute, setObservedObject
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Constructor Details
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CounterMonitor
public CounterMonitor()Default constructor.
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Method Details
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start
public void start()Starts the counter monitor.- Specified by:
start
in interfaceMonitorMBean
- Specified by:
start
in classMonitor
-
stop
public void stop()Stops the counter monitor.- Specified by:
stop
in interfaceMonitorMBean
- Specified by:
stop
in classMonitor
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getDerivedGauge
Gets the derived gauge of the specified object, if this object is contained in the set of observed MBeans, ornull
otherwise.- Specified by:
getDerivedGauge
in interfaceCounterMonitorMBean
- Parameters:
object
- the name of the object whose derived gauge is to be returned.- Returns:
- The derived gauge of the specified object.
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getDerivedGaugeTimeStamp
Gets the derived gauge timestamp of the specified object, if this object is contained in the set of observed MBeans, or0
otherwise.- Specified by:
getDerivedGaugeTimeStamp
in interfaceCounterMonitorMBean
- Parameters:
object
- the name of the object whose derived gauge timestamp is to be returned.- Returns:
- The derived gauge timestamp of the specified object.
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getThreshold
Gets the current threshold value of the specified object, if this object is contained in the set of observed MBeans, ornull
otherwise.- Specified by:
getThreshold
in interfaceCounterMonitorMBean
- Parameters:
object
- the name of the object whose threshold is to be returned.- Returns:
- The threshold value of the specified object.
- See Also:
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getInitThreshold
Gets the initial threshold value common to all observed objects.- Specified by:
getInitThreshold
in interfaceCounterMonitorMBean
- Returns:
- The initial threshold.
- See Also:
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setInitThreshold
Sets the initial threshold value common to all observed objects.
The current threshold of every object in the set of observed MBeans is updated consequently.- Specified by:
setInitThreshold
in interfaceCounterMonitorMBean
- Parameters:
value
- The initial threshold value.- Throws:
IllegalArgumentException
- The specified threshold is null or the threshold value is less than zero.- See Also:
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getDerivedGauge
Deprecated.As of JMX 1.2, replaced bygetDerivedGauge(ObjectName)
Returns the derived gauge of the first object in the set of observed MBeans.- Specified by:
getDerivedGauge
in interfaceCounterMonitorMBean
- Returns:
- The derived gauge.
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getDerivedGaugeTimeStamp
Deprecated.As of JMX 1.2, replaced bygetDerivedGaugeTimeStamp(ObjectName)
Gets the derived gauge timestamp of the first object in the set of observed MBeans.- Specified by:
getDerivedGaugeTimeStamp
in interfaceCounterMonitorMBean
- Returns:
- The derived gauge timestamp.
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getThreshold
Deprecated.As of JMX 1.2, replaced bygetThreshold(ObjectName)
Gets the threshold value of the first object in the set of observed MBeans.- Specified by:
getThreshold
in interfaceCounterMonitorMBean
- Returns:
- The threshold value.
- See Also:
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setThreshold
Deprecated.As of JMX 1.2, replaced bysetInitThreshold(java.lang.Number)
Sets the initial threshold value.- Specified by:
setThreshold
in interfaceCounterMonitorMBean
- Parameters:
value
- The initial threshold value.- Throws:
IllegalArgumentException
- The specified threshold is null or the threshold value is less than zero.- See Also:
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getOffset
Gets the offset value common to all observed MBeans.- Specified by:
getOffset
in interfaceCounterMonitorMBean
- Returns:
- The offset value.
- See Also:
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setOffset
Sets the offset value common to all observed MBeans.- Specified by:
setOffset
in interfaceCounterMonitorMBean
- Parameters:
value
- The offset value.- Throws:
IllegalArgumentException
- The specified offset is null or the offset value is less than zero.- See Also:
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getModulus
Gets the modulus value common to all observed MBeans.- Specified by:
getModulus
in interfaceCounterMonitorMBean
- Returns:
- The modulus value.
- See Also:
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setModulus
Sets the modulus value common to all observed MBeans.- Specified by:
setModulus
in interfaceCounterMonitorMBean
- Parameters:
value
- The modulus value.- Throws:
IllegalArgumentException
- The specified modulus is null or the modulus value is less than zero.- See Also:
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getNotify
public boolean getNotify()Gets the notification's on/off switch value common to all observed MBeans.- Specified by:
getNotify
in interfaceCounterMonitorMBean
- Returns:
true
if the counter monitor notifies when exceeding the threshold,false
otherwise.- See Also:
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setNotify
public void setNotify(boolean value) Sets the notification's on/off switch value common to all observed MBeans.- Specified by:
setNotify
in interfaceCounterMonitorMBean
- Parameters:
value
- The notification's on/off switch value.- See Also:
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getDifferenceMode
public boolean getDifferenceMode()Gets the difference mode flag value common to all observed MBeans.- Specified by:
getDifferenceMode
in interfaceCounterMonitorMBean
- Returns:
true
if the difference mode is used,false
otherwise.- See Also:
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setDifferenceMode
public void setDifferenceMode(boolean value) Sets the difference mode flag value common to all observed MBeans.- Specified by:
setDifferenceMode
in interfaceCounterMonitorMBean
- Parameters:
value
- The difference mode flag value.- See Also:
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getNotificationInfo
Returns aNotificationInfo
object containing the name of the Java class of the notification and the notification types sent by the counter monitor.- Specified by:
getNotificationInfo
in interfaceNotificationBroadcaster
- Returns:
- the array of possible notifications.
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getDerivedGauge(ObjectName)