Package org.apache.hadoop.hbase.util

Class ClassSize.UnsafeLayout

java.lang.Object

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

org.apache.hadoop.hbase.util.ClassSize.UnsafeLayout

Enclosing class:

ClassSize

private static class ClassSize.UnsafeLayout
extends ClassSize.MemoryLayout

UnsafeLayout uses Unsafe to guesstimate the object-layout related parameters like object header sizes and oop sizes See HBASE-15950.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static final class	ClassSize.UnsafeLayout.HeaderSize

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	ARRAY_BYTE_INDEX_SCALE
private static final int	ARRAY_OBJECT_INDEX_SCALE

Constructor Summary

Constructors

Constructor	Description
UnsafeLayout()

Method Summary

Modifier and Type	Method	Description
(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 org.apache.hadoop.hbase.util.ClassSize.MemoryLayout

align

Methods inherited from class java.lang.Object

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

Field Details

ARRAY_OBJECT_INDEX_SCALE

private static final int ARRAY_OBJECT_INDEX_SCALE

ARRAY_BYTE_INDEX_SCALE

private static final int ARRAY_BYTE_INDEX_SCALE

Constructor Details

UnsafeLayout

public UnsafeLayout()

Method Details

headerSize

int headerSize()

Overrides:

headerSize in class ClassSize.MemoryLayout

arrayHeaderSize

int arrayHeaderSize()

Overrides:

arrayHeaderSize in class ClassSize.MemoryLayout

oopSize

int oopSize()

Description copied from class: ClassSize.MemoryLayout

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

Overrides:

oopSize in class ClassSize.MemoryLayout

sizeOfByteArray

long sizeOfByteArray(int len)

Overrides:

sizeOfByteArray in class ClassSize.MemoryLayout