org.apache.lucene.util
Class MemoryModel

java.lang.Object
  org.apache.lucene.util.MemoryModel

Direct Known Subclasses:

AverageGuessMemoryModel

public abstract class MemoryModel
extends Object

Returns primitive memory sizes for estimating RAM usage.

Constructor Summary

MemoryModel()

Method Summary

abstract int	getArraySize()
abstract int	getClassSize()
abstract int	getPrimitiveSize(Class clazz)
abstract int	getReferenceSize()

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryModel

public MemoryModel()

Method Detail

getArraySize

public abstract int getArraySize()

Returns:

size of array beyond contents

getClassSize

public abstract int getClassSize()

Returns:

Class size overhead

getPrimitiveSize

public abstract int getPrimitiveSize(Class clazz)

Parameters:

clazz - a primitive Class - bool, byte, char, short, long, float, short, double, int

Returns:

the size in bytes of given primitive Class

getReferenceSize

public abstract int getReferenceSize()

Returns:

size of reference