Java compact3 javax.management.monitor Class CounterMonitor（JDK8）

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Standard Ed. 8

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java.lang.Object
- javax.management.NotificationBroadcasterSupport
- - javax.management.monitor.Monitor
  - - javax.management.monitor.CounterMonitor

All Implemented Interfaces:

MBeanRegistration, CounterMonitorMBean, MonitorMBean, NotificationBroadcaster, NotificationEmitter
```
public class CounterMonitor
extends Monitor
implements CounterMonitorMBean
```
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:
- 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
This implementation of the counter monitor requires the observed attribute to be of the type integer (Byte, Integer, Short, Long).
Since:

1.5

Field Summary
- Fields inherited from 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

Constructor Summary

Constructors
Constructor and Description
`CounterMonitor()` Default constructor.

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`Number`	`getDerivedGauge()` Deprecated. As of JMX 1.2, replaced by `getDerivedGauge(ObjectName)`
`Number`	`getDerivedGauge(ObjectName object)` Gets the derived gauge of the specified object, if this object is contained in the set of observed MBeans, or `null` otherwise.
`long`	`getDerivedGaugeTimeStamp()` Deprecated. As of JMX 1.2, replaced by `getDerivedGaugeTimeStamp(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, or `0` otherwise.
`boolean`	`getDifferenceMode()` Gets the difference mode flag value common to all observed MBeans.
`Number`	`getInitThreshold()` Gets the initial threshold value common to all observed objects.
`Number`	`getModulus()` Gets the modulus value common to all observed MBeans.
`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 common to all observed MBeans.
`Number`	`getOffset()` Gets the offset value common to all observed MBeans.
`Number`	`getThreshold()` Deprecated. As of JMX 1.2, replaced by `getThreshold(ObjectName)`
`Number`	`getThreshold(ObjectName object)` Gets the current threshold value of the specified object, if this object is contained in the set of observed MBeans, or `null` 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`	`setOffset(Number value)` Sets the offset value common to all observed MBeans.
`void`	`setThreshold(Number value)` Deprecated. As of JMX 1.2, replaced by `setInitThreshold(java.lang.Number)`
`void`	`start()` Starts the counter monitor.
`void`	`stop()` Stops the counter monitor.

Methods inherited from class javax.management.monitor.Monitor
addObservedObject, containsObservedObject, getGranularityPeriod, getObservedAttribute, getObservedObject, getObservedObjects, isActive, postDeregister, postRegister, preDeregister, preRegister, removeObservedObject, setGranularityPeriod, setObservedAttribute, setObservedObject

Methods inherited from class javax.management.NotificationBroadcasterSupport
addNotificationListener, handleNotification, removeNotificationListener, removeNotificationListener, sendNotification

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface javax.management.monitor.MonitorMBean
addObservedObject, containsObservedObject, getGranularityPeriod, getObservedAttribute, getObservedObject, getObservedObjects, isActive, removeObservedObject, setGranularityPeriod, setObservedAttribute, setObservedObject

- Constructor Detail
  - CounterMonitor
```
public CounterMonitor()
```
    Default constructor.
- Method Detail
  - start
```
public void start()
```
    Starts the counter monitor.
    
    Specified by:
    
    start in interface MonitorMBean
    
    Specified by:
    
    start in class Monitor
  - stop
```
public void stop()
```
    Stops the counter monitor.
    
    Specified by:
    
    stop in interface MonitorMBean
    
    Specified by:
    
    stop in class Monitor
  - getDerivedGauge
```
public Number getDerivedGauge(ObjectName object)
```
    Gets the derived gauge of the specified object, if this object is contained in the set of observed MBeans, or null otherwise.
    
    Specified by:
    
    getDerivedGauge in interface CounterMonitorMBean
    
    Parameters:
    
    object - the name of the object whose derived gauge is to be returned.
    
    Returns:
    
    The derived gauge of the specified object.
  - getDerivedGaugeTimeStamp
```
public long getDerivedGaugeTimeStamp(ObjectName object)
```
    Gets the derived gauge timestamp of the specified object, if this object is contained in the set of observed MBeans, or 0 otherwise.
    
    Specified by:
    
    getDerivedGaugeTimeStamp in interface CounterMonitorMBean
    
    Parameters:
    
    object - the name of the object whose derived gauge timestamp is to be returned.
    
    Returns:
    
    The derived gauge timestamp of the specified object.
  - getThreshold
```
public Number getThreshold(ObjectName object)
```
    Gets the current threshold value of the specified object, if this object is contained in the set of observed MBeans, or null otherwise.
    
    Specified by:
    
    getThreshold in interface CounterMonitorMBean
    
    Parameters:
    
    object - the name of the object whose threshold is to be returned.
    
    Returns:
    
    The threshold value of the specified object.
    
    See Also:
    
    CounterMonitorMBean.setThreshold(java.lang.Number)
  - getInitThreshold
```
public Number getInitThreshold()
```
    Gets the initial threshold value common to all observed objects.
    
    Specified by:
    
    getInitThreshold in interface CounterMonitorMBean
    
    Returns:
    
    The initial threshold.
    
    See Also:
    
    setInitThreshold(java.lang.Number)
  - setInitThreshold
```
public void setInitThreshold(Number value)
                      throws IllegalArgumentException
```
    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 interface CounterMonitorMBean
    
    Parameters:
    
    value - The initial threshold value.
    
    Throws:
    
    IllegalArgumentException - The specified threshold is null or the threshold value is less than zero.
    
    See Also:
    
    getInitThreshold()
  - getDerivedGauge
```
@Deprecated
public Number getDerivedGauge()
```
    Deprecated. As of JMX 1.2, replaced by getDerivedGauge(ObjectName)
    
    Returns the derived gauge of the first object in the set of observed MBeans.
    
    Specified by:
    
    getDerivedGauge in interface CounterMonitorMBean
    
    Returns:
    
    The derived gauge.
  - getDerivedGaugeTimeStamp
```
@Deprecated
public long getDerivedGaugeTimeStamp()
```
    Deprecated. As of JMX 1.2, replaced by getDerivedGaugeTimeStamp(ObjectName)
    
    Gets the derived gauge timestamp of the first object in the set of observed MBeans.
    
    Specified by:
    
    getDerivedGaugeTimeStamp in interface CounterMonitorMBean
    
    Returns:
    
    The derived gauge timestamp.
  - getThreshold
```
@Deprecated
public Number getThreshold()
```
    Deprecated. As of JMX 1.2, replaced by getThreshold(ObjectName)
    
    Gets the threshold value of the first object in the set of observed MBeans.
    
    Specified by:
    
    getThreshold in interface CounterMonitorMBean
    
    Returns:
    
    The threshold value.
    
    See Also:
    
    setThreshold(java.lang.Number)
  - setThreshold
```
@Deprecated
public void setThreshold(Number value)
                              throws IllegalArgumentException
```
    Deprecated. As of JMX 1.2, replaced by setInitThreshold(java.lang.Number)
    
    Sets the initial threshold value.
    
    Specified by:
    
    setThreshold in interface CounterMonitorMBean
    
    Parameters:
    
    value - The initial threshold value.
    
    Throws:
    
    IllegalArgumentException - The specified threshold is null or the threshold value is less than zero.
    
    See Also:
    
    getThreshold()
  - getOffset
```
public Number getOffset()
```
    Gets the offset value common to all observed MBeans.
    
    Specified by:
    
    getOffset in interface CounterMonitorMBean
    
    Returns:
    
    The offset value.
    
    See Also:
    
    setOffset(java.lang.Number)
  - setOffset
```
public void setOffset(Number value)
               throws IllegalArgumentException
```
    Sets the offset value common to all observed MBeans.
    
    Specified by:
    
    setOffset in interface CounterMonitorMBean
    
    Parameters:
    
    value - The offset value.
    
    Throws:
    
    IllegalArgumentException - The specified offset is null or the offset value is less than zero.
    
    See Also:
    
    getOffset()
  - getModulus
```
public Number getModulus()
```
    Gets the modulus value common to all observed MBeans.
    
    Specified by:
    
    getModulus in interface CounterMonitorMBean
    
    Returns:
    
    The modulus value.
    
    See Also:
    
    setModulus(java.lang.Number)
  - setModulus
```
public void setModulus(Number value)
                throws IllegalArgumentException
```
    Sets the modulus value common to all observed MBeans.
    
    Specified by:
    
    setModulus in interface CounterMonitorMBean
    
    Parameters:
    
    value - The modulus value.
    
    Throws:
    
    IllegalArgumentException - The specified modulus is null or the modulus value is less than zero.
    
    See Also:
    
    getModulus()
  - getNotify
```
public boolean getNotify()
```
    Gets the notification's on/off switch value common to all observed MBeans.
    
    Specified by:
    
    getNotify in interface CounterMonitorMBean
    
    Returns:
    
    true if the counter monitor notifies when exceeding the threshold, false otherwise.
    
    See Also:
    
    setNotify(boolean)
  - setNotify
```
public void setNotify(boolean value)
```
    Sets the notification's on/off switch value common to all observed MBeans.
    
    Specified by:
    
    setNotify in interface CounterMonitorMBean
    
    Parameters:
    
    value - The notification's on/off switch value.
    
    See Also:
    
    getNotify()
  - getDifferenceMode
```
public boolean getDifferenceMode()
```
    Gets the difference mode flag value common to all observed MBeans.
    
    Specified by:
    
    getDifferenceMode in interface CounterMonitorMBean
    
    Returns:
    
    true if the difference mode is used, false otherwise.
    
    See Also:
    
    setDifferenceMode(boolean)
  - setDifferenceMode
```
public void setDifferenceMode(boolean value)
```
    Sets the difference mode flag value common to all observed MBeans.
    
    Specified by:
    
    setDifferenceMode in interface CounterMonitorMBean
    
    Parameters:
    
    value - The difference mode flag value.
    
    See Also:
    
    getDifferenceMode()
  - getNotificationInfo
```
public 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.
    
    Specified by:
    
    getNotificationInfo in interface NotificationBroadcaster
    
    Overrides:
    
    getNotificationInfo in class NotificationBroadcasterSupport
    
    Returns:
    
    the array of possible notifications.

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Java compact3 javax.management.monitor Class CounterMonitor（JDK8）

Class CounterMonitor

Field Summary

Fields inherited from class javax.management.monitor.Monitor

Constructor Summary

Method Summary

Methods inherited from class javax.management.monitor.Monitor

Methods inherited from class javax.management.NotificationBroadcasterSupport

Methods inherited from class java.lang.Object

Methods inherited from interface javax.management.monitor.MonitorMBean

Constructor Detail

CounterMonitor

Method Detail

start

stop

getDerivedGauge

getDerivedGaugeTimeStamp

getThreshold

getInitThreshold

setInitThreshold

getDerivedGauge

getDerivedGaugeTimeStamp

getThreshold

setThreshold

getOffset

setOffset

getModulus

setModulus

getNotify

setNotify

getDifferenceMode

setDifferenceMode

getNotificationInfo