org.apache.cassandra.utils

Class ObjectSizes

java.lang.Object

org.apache.cassandra.utils.ObjectSizes

public class ObjectSizes
extends java.lang.Object

A convenience class for wrapping access to MemoryMeter

Constructor Summary

Constructors

Constructor and Description
ObjectSizes()

Method Summary

Modifier and Type	Method and Description
static long	measure(java.lang.Object pojo)
static long	measureDeep(java.lang.Object pojo)
static long	sizeOf(java.lang.String str) Memory a String consumes
static long	sizeOfArray(byte[] bytes) Memory a byte array consumes
static long	sizeOfArray(int[] ints) Memory an int array consumes
static long	sizeOfArray(long[] longs) Memory a long array consumes
static long	sizeOfArray(java.lang.Object[] objects) Memory a reference array consumes itself only
static long	sizeOfReferenceArray(int length) Memory a reference array consumes
static long	sizeOnHeapExcludingData(java.nio.ByteBuffer buffer)
static long	sizeOnHeapExcludingData(java.nio.ByteBuffer[] array)
static long	sizeOnHeapOf(java.nio.ByteBuffer buffer) Memory a byte buffer consumes
static long	sizeOnHeapOf(java.nio.ByteBuffer[] array) Memory a ByteBuffer array consumes.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectSizes

public ObjectSizes()

Method Detail

sizeOfArray

public static long sizeOfArray(byte[] bytes)

Memory a byte array consumes

Parameters:

bytes - byte array to get memory size

Returns:

heap-size of the array

sizeOfArray

public static long sizeOfArray(long[] longs)

Memory a long array consumes

Parameters:

longs - byte array to get memory size

Returns:

heap-size of the array

sizeOfArray

public static long sizeOfArray(int[] ints)

Memory an int array consumes

Parameters:

ints - byte array to get memory size

Returns:

heap-size of the array

sizeOfReferenceArray

public static long sizeOfReferenceArray(int length)

Memory a reference array consumes

Parameters:

length - the length of the reference array

Returns:

heap-size of the array

sizeOfArray

public static long sizeOfArray(java.lang.Object[] objects)

Memory a reference array consumes itself only

Parameters:

objects - the array to size

Returns:

heap-size of the array (excluding memory retained by referenced objects)

sizeOnHeapOf

public static long sizeOnHeapOf(java.nio.ByteBuffer[] array)

Memory a ByteBuffer array consumes.

sizeOnHeapExcludingData

public static long sizeOnHeapExcludingData(java.nio.ByteBuffer[] array)

sizeOnHeapOf

public static long sizeOnHeapOf(java.nio.ByteBuffer buffer)

Memory a byte buffer consumes

Parameters:

buffer - ByteBuffer to calculate in memory size

Returns:

Total in-memory size of the byte buffer

sizeOnHeapExcludingData

public static long sizeOnHeapExcludingData(java.nio.ByteBuffer buffer)

sizeOf

public static long sizeOf(java.lang.String str)

Memory a String consumes

Parameters:

str - String to calculate memory size of

Returns:

Total in-memory size of the String

measureDeep

public static long measureDeep(java.lang.Object pojo)

Parameters:

pojo - the object to measure

Returns:

the size on the heap of the instance and all retained heap referenced by it, excluding portions of ByteBuffer that are not directly referenced by it but including any other referenced that may also be retained by other objects.

measure

public static long measure(java.lang.Object pojo)

Parameters:

pojo - the object to measure

Returns:

the size on the heap of the instance only, excluding any referenced objects