Class ReflectionSizeOf

java.lang.Object

org.ehcache.sizeof.SizeOf

org.ehcache.sizeof.impl.ReflectionSizeOf

public class ReflectionSizeOf
extends SizeOf

SizeOf that uses reflection to measure on heap size of object graphs Inspired by Dr. Heinz Kabutz's Java Specialist Newsletter Issue #78

Author:

Alex Snaps, Chris Dennis

Constructor Summary

Constructors

Constructor	Description
ReflectionSizeOf()	Builds a new SizeOf that will not filter fields and will cache reflected fields
ReflectionSizeOf(SizeOfFilter fieldFilter)	Builds a new SizeOf that will filter fields and will cache reflected fields
ReflectionSizeOf(SizeOfFilter fieldFilter, boolean caching, boolean bypassFlyweight)	Builds a new SizeOf that will filter fields

Method Summary

Modifier and Type	Method	Description
long	sizeOf(Object obj)	Calculates the size in memory (heap) of the instance passed in, not navigating the down graph

Methods inherited from class SizeOf

deepSizeOf, deepSizeOf, newInstance, newInstance

Methods inherited from class Object

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

Constructor Details

ReflectionSizeOf

public ReflectionSizeOf()

Builds a new SizeOf that will not filter fields and will cache reflected fields

See Also:

• ReflectionSizeOf(SizeOfFilter, boolean, boolean)

ReflectionSizeOf

public ReflectionSizeOf(SizeOfFilter fieldFilter)

Builds a new SizeOf that will filter fields and will cache reflected fields

Parameters:

fieldFilter - The filter to apply

See Also:

• ReflectionSizeOf(SizeOfFilter, boolean, boolean)
• SizeOfFilter

ReflectionSizeOf

public ReflectionSizeOf(SizeOfFilter fieldFilter,
 boolean caching,
 boolean bypassFlyweight)

Builds a new SizeOf that will filter fields

Parameters:

fieldFilter - The filter to apply

caching - Whether to cache reflected fields

bypassFlyweight - whether "Flyweight Objects" are to be ignored

See Also:

• SizeOfFilter

Method Details

sizeOf

public long sizeOf(Object obj)

Calculates the size in memory (heap) of the instance passed in, not navigating the down graph

Specified by:

sizeOf in class SizeOf

Parameters:

obj - the object to measure the size of

Returns:

the object size in memory in bytes