net.admin4j.monitor

Class LowMemoryDetector

java.lang.Object

net.admin4j.monitor.Detector

net.admin4j.monitor.LowMemoryDetector

All Implemented Interfaces:

java.lang.Runnable

public class LowMemoryDetector
extends Detector

Notifies administrators for low memory conditions experienced by application.

Since:

1.0

Author:

D. Ashmore

Field Summary

Fields

Modifier and Type	Field and Description
static long	DEFAULT_LOW_WATERMARK_MONITOR_INTERVAL_IN_MILLIS
static int	DEFAULT_MEMORY_USAGE_THRESHOLD_PCT
static int	DEFAULT_NBR_INTERVALS_BETWEEN_WARNINGS
static int	DEFAULT_NBR_LOW_WATERMARK_INTERVALS
static long	DEFAULT_SLEEP_INTERVAL
static long	DEFAULT_STARTUP_PERIOD_IN_MILLIS

Fields inherited from class net.admin4j.monitor.Detector

logger, notifier

Constructor Summary

Constructors

Constructor and Description
LowMemoryDetector(Notifier notifier)
LowMemoryDetector(Notifier notifier, long memoryThresholdPct, int nbrIntervalsBetweenWarnings, int nbrLowWatermarkIntervals, long lowWatermarkMonitorIntervalInMillis)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	checkMemory(MemoryUtilizationVO memoryVO)
long	getLowWatermarkMonitorIntervalInMillis()
long	getMemoryThresholdPct()
int	getNbrIntervalsBetweenWarnings()
int	getNbrIntervalsSinceLastWarning()
int	getNbrLowWatermarkIntervals()
long	getStartupPeriodInMillis()
boolean	isLowMemoryStateDetected()
void	run()
protected void	sendAllClearMemoryNotice(MemoryUtilizationVO memoryUtilization)
protected void	sendLowMemoryNotice(MemoryUtilizationVO memoryUtilization)
protected void	setLowWatermarkMonitorIntervalInMillis(long lowWatermarkMonitorIntervalInMillis)
protected void	setMemoryThresholdPct(long usedMemoryThresholdPct)
protected void	setNbrIntervalsBetweenWarnings(int nbrIntervalsBetweenWarnings)
protected void	setNbrLowWatermarkIntervals(int nbrLowWatermarkIntervals)
protected void	setStartupPeriodInMillis(long startupPeriodInMillis)
protected void	watchLowWatermark(MemoryUtilizationVO memoryVO)

Methods inherited from class net.admin4j.monitor.Detector

getNotifier, sendMessage

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_MEMORY_USAGE_THRESHOLD_PCT

public static final int DEFAULT_MEMORY_USAGE_THRESHOLD_PCT

See Also:

Constant Field Values

DEFAULT_SLEEP_INTERVAL

public static final long DEFAULT_SLEEP_INTERVAL

See Also:

Constant Field Values

DEFAULT_NBR_INTERVALS_BETWEEN_WARNINGS

public static final int DEFAULT_NBR_INTERVALS_BETWEEN_WARNINGS

See Also:

Constant Field Values

DEFAULT_STARTUP_PERIOD_IN_MILLIS

public static final long DEFAULT_STARTUP_PERIOD_IN_MILLIS

See Also:

Constant Field Values

DEFAULT_LOW_WATERMARK_MONITOR_INTERVAL_IN_MILLIS

public static final long DEFAULT_LOW_WATERMARK_MONITOR_INTERVAL_IN_MILLIS

See Also:

Constant Field Values

DEFAULT_NBR_LOW_WATERMARK_INTERVALS

public static final int DEFAULT_NBR_LOW_WATERMARK_INTERVALS

See Also:

Constant Field Values

Constructor Detail

LowMemoryDetector

public LowMemoryDetector(Notifier notifier)

LowMemoryDetector

public LowMemoryDetector(Notifier notifier,
                 long memoryThresholdPct,
                 int nbrIntervalsBetweenWarnings,
                 int nbrLowWatermarkIntervals,
                 long lowWatermarkMonitorIntervalInMillis)

Method Detail

run

public void run()

watchLowWatermark

protected void watchLowWatermark(MemoryUtilizationVO memoryVO)

checkMemory

protected void checkMemory(MemoryUtilizationVO memoryVO)

sendLowMemoryNotice

protected void sendLowMemoryNotice(MemoryUtilizationVO memoryUtilization)

sendAllClearMemoryNotice

protected void sendAllClearMemoryNotice(MemoryUtilizationVO memoryUtilization)

getMemoryThresholdPct

public long getMemoryThresholdPct()

setMemoryThresholdPct

protected void setMemoryThresholdPct(long usedMemoryThresholdPct)

getNbrIntervalsBetweenWarnings

public int getNbrIntervalsBetweenWarnings()

setNbrIntervalsBetweenWarnings

protected void setNbrIntervalsBetweenWarnings(int nbrIntervalsBetweenWarnings)

getNbrIntervalsSinceLastWarning

public int getNbrIntervalsSinceLastWarning()

isLowMemoryStateDetected

public boolean isLowMemoryStateDetected()

getStartupPeriodInMillis

public long getStartupPeriodInMillis()

setStartupPeriodInMillis

protected void setStartupPeriodInMillis(long startupPeriodInMillis)

getLowWatermarkMonitorIntervalInMillis

public long getLowWatermarkMonitorIntervalInMillis()

setLowWatermarkMonitorIntervalInMillis

protected void setLowWatermarkMonitorIntervalInMillis(long lowWatermarkMonitorIntervalInMillis)

getNbrLowWatermarkIntervals

public int getNbrLowWatermarkIntervals()

setNbrLowWatermarkIntervals

protected void setNbrLowWatermarkIntervals(int nbrLowWatermarkIntervals)