org.apache.hadoop.hbase.util

Class ClassSize.MemoryLayout

java.lang.Object

org.apache.hadoop.hbase.util.ClassSize.MemoryLayout

Direct Known Subclasses:

ClassSize.UnsafeLayout

Enclosing class:

ClassSize

private static class ClassSize.MemoryLayout
extends Object

MemoryLayout abstracts details about the JVM object layout. Default implementation is used in case Unsafe is not available.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	MemoryLayout()

Method Summary

Modifier and Type	Method and Description
long	align(long num) Aligns a number to 8.
(package private) int	arrayHeaderSize()
(package private) int	headerSize()
(package private) int	oopSize() Return the size of an "ordinary object pointer".
(package private) long	sizeOfByteArray(int len)

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryLayout

private MemoryLayout()

Method Detail

headerSize

int headerSize()

arrayHeaderSize

int arrayHeaderSize()

oopSize

int oopSize()

Return the size of an "ordinary object pointer". Either 4 or 8, depending on 32/64 bit, and CompressedOops

align

public long align(long num)

Aligns a number to 8.

Parameters:

num - number to align to 8

Returns:

smallest number >= input that is a multiple of 8

sizeOfByteArray

long sizeOfByteArray(int len)