org.terrier.utility
Class RuntimeMemoryChecker

java.lang.Object
  org.terrier.utility.RuntimeMemoryChecker

All Implemented Interfaces:

MemoryChecker

public class RuntimeMemoryChecker
extends java.lang.Object
implements MemoryChecker

A memory checker that uses the Java Runtime instance to check the amount of available memory. A given amount of memory must be kept free, however, this condition is only signalled if a given percentage of the JVM's potential memory usage has been exhausted.

Field Summary

protected static org.apache.log4j.Logger	logger the logger for this class
protected static java.lang.Runtime	runtime JVM runtime

Constructor Summary

RuntimeMemoryChecker()
Default constructor.

RuntimeMemoryChecker(long _reserved, double _threshold)
Construct a RuntimeMemoryChecker.

Method Summary

boolean	checkMemory() Returns true if memory is running low
void	reset() Reset the out of memory flag

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected static final org.apache.log4j.Logger logger

the logger for this class

runtime

protected static final java.lang.Runtime runtime

JVM runtime

Constructor Detail

RuntimeMemoryChecker

public RuntimeMemoryChecker()

Default constructor. Uses ApplicationSetup.MEMORY_THRESHOLD_SINGLEPASS and memory.heap.usage for the default memory threshold amount (default 0.70).

RuntimeMemoryChecker

public RuntimeMemoryChecker(long _reserved,
                            double _threshold)

Construct a RuntimeMemoryChecker.

Parameters:

_reserved - The amount of memory that must be kept available.

_threshold - Percentage of possible memory that must be allocated before a lowMemory condition is allowed.

Method Detail

checkMemory

public boolean checkMemory()

Returns true if memory is running low

Specified by:

checkMemory in interface MemoryChecker

reset

public void reset()

Reset the out of memory flag

Specified by:

reset in interface MemoryChecker