mondrian.util
Class NotificationMemoryMonitor

java.lang.Object
  mondrian.util.AbstractMemoryMonitor
      mondrian.util.NotificationMemoryMonitor

All Implemented Interfaces:

MemoryMonitor, MemoryMonitor.Test

Direct Known Subclasses:

MemoryMonitorTest.TestMM, MemoryMonitorTest.TestMM2

public class NotificationMemoryMonitor
extends AbstractMemoryMonitor

The NotificationMemoryMonitor class uses the Java5 memory management system to detect system low memory events.

This code is loosely based on the code taken from The Java Specialists' Newsletter, issue 92 authored by Dr. Heinz M. Kabutz. As a note, his on-line newletters are a good source of Java information, take a look.

For more information one should review the Java5 classes in java.lang.management.

Since:

Feb 03 2007

Version:

$Id: //open/mondrian-release/3.0/src/main/mondrian/util/NotificationMemoryMonitor.java#2 $

Author:

Richard M. Emberson

Nested Class Summary

Nested classes/interfaces inherited from class mondrian.util.AbstractMemoryMonitor

AbstractMemoryMonitor.Entry

Nested classes/interfaces inherited from interface mondrian.util.MemoryMonitor

MemoryMonitor.Listener, MemoryMonitor.Test

Field Summary

protected static MemoryPoolMXBean

TENURED_POOL

Constructor Summary

NotificationMemoryMonitor()
Construct a NotificationMemoryMonitor instance and register it with the Java5 memory management system.

Method Summary

protected org.apache.log4j.Logger	getLogger() Get the Logger.
long	getMaxMemory() Get the maximum possible memory usage for this JVM instance.
long	getUsedMemory() Get the current memory usage for this JVM instance.
protected void	notifyNewLowThreshold(long newLowThreshold) Notify the Java5 memory management system that there is a new low threshold.

Methods inherited from class mondrian.util.AbstractMemoryMonitor

addListener, addListener, convertPercentageToThreshold, convertThresholdToPercentage, generateLowThreshold, getDefaultThresholdPercentage, getLowThreshold, notifyListeners, removeAllListener, removeListener, resetFromTest, updateListenerThreshold, usagePercentage

Methods inherited from class java.lang.Object

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

Field Detail

TENURED_POOL

protected static final MemoryPoolMXBean TENURED_POOL

Constructor Detail

NotificationMemoryMonitor

NotificationMemoryMonitor()

Construct a NotificationMemoryMonitor instance and register it with the Java5 memory management system.

Method Detail

getLogger

protected org.apache.log4j.Logger getLogger()

Get the Logger.

Specified by:

getLogger in class AbstractMemoryMonitor

Returns:

the Logger.

notifyNewLowThreshold

protected void notifyNewLowThreshold(long newLowThreshold)

Notify the Java5 memory management system that there is a new low threshold.

Overrides:

notifyNewLowThreshold in class AbstractMemoryMonitor

Parameters:

newLowThreshold - the new threshold.

getMaxMemory

public long getMaxMemory()

Get the maximum possible memory usage for this JVM instance.

Returns:

maximum memory that can be used.

getUsedMemory

public long getUsedMemory()

Get the current memory usage for this JVM instance.

Returns:

current memory used.