org.xmlBlaster.util.admin.extern
Class LowMemoryDetector

java.lang.Object
  org.xmlBlaster.util.admin.extern.LowMemoryDetector

public class LowMemoryDetector

extends java.lang.Object

Get notification when heap memory usage exceeds 90%. Configuration:

-xmlBlaster/jmx/observeLowMemory       Write a log error when 90% of the JVM memory is used (JDK >= 1.5) [true]
-xmlBlaster/jmx/memoryThresholdFactor  Configure the log error memory threshhold (defaults to 90%) (JDK >= 1.5) [0.9]
-xmlBlaster/jmx/exitOnMemoryThreshold  If true xmlBlaster stops if the memoryThresholdFactor is reached (JDK >= 1.5) [false]
 

Since:

JDK 1.5 and xmlBlaster 1.0.7

Author:

Marcel Ruff

Constructor Summary

LowMemoryDetector()
Default ctor for 90% threshold and registered DefaultLowMemoryListener.

LowMemoryDetector(float thresholdFactor)

Method Summary

javax.management.MBeanServer	getMBeanServer()
static void	main(java.lang.String[] args) Tester: java -Xms2M -Xmx3M -Dcom.sun.management.jmxremote -DxmlBlaster/jmx/exitOnMemoryThreshold=true org.xmlBlaster.util.admin.extern.LowMemoryDetector
static long	maxJvmMemory() Access the max available RAM for this JVM.
void	register(javax.management.NotificationListener listener) Register your low memory listener.

Methods inherited from class java.lang.Object

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

Constructor Detail

LowMemoryDetector

public LowMemoryDetector()

Default ctor for 90% threshold and registered DefaultLowMemoryListener.

LowMemoryDetector

public LowMemoryDetector(float thresholdFactor)

Parameters:

thresholdFactor - Use typically 0.9, if 90% of heap is used up the listener is triggered

Method Detail

maxJvmMemory

public static long maxJvmMemory()

Access the max available RAM for this JVM. You can increase it with 'java -Xmx256M ...'

Returns:

bytes

getMBeanServer

public javax.management.MBeanServer getMBeanServer()

register

public void register(javax.management.NotificationListener listener)

Register your low memory listener.

main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

Tester: java -Xms2M -Xmx3M -Dcom.sun.management.jmxremote -DxmlBlaster/jmx/exitOnMemoryThreshold=true org.xmlBlaster.util.admin.extern.LowMemoryDetector

Throws:

java.io.IOException