Package sizeof.agent

Class SizeOfAgent

java.lang.Object

sizeof.agent.SizeOfAgent

public class SizeOfAgent
extends Object

Instrumentation agent used.
This version merely outputs an error message on the commandline if the agent is not present instead of throwing an exception.

Author:

Maxim Zakharenkov, FracPete (fracpete at waikato dot ac dot nz)

Constructor Summary

Constructors

Constructor	Description
SizeOfAgent()

Method Summary

Modifier and Type	Method	Description
static long	fullSizeOf(Object obj)	Calculates full size of object iterating over its hierarchy graph.
static long	fullSizeOf(Object obj, Filter filter)	Calculates full size of object iterating over its hierarchy graph.
static Map<Class,Statistics>	fullSizePerClass(Object obj)	Calculates size/count statistics of object iterating over its hierarchy graph, breaking it down per class.
static Map<Class,Statistics>	fullSizePerClass(Object obj, Filter filter)	Calculates size/count statistics of object iterating over its hierarchy graph, breaking it down per class.
static void	premain(String agentArgs, Instrumentation instP)	initializes agent.
static long	sizeOf(Object o)	Returns object size without member sub-objects.

Methods inherited from class java.lang.Object

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

Constructor Detail

SizeOfAgent

public SizeOfAgent()

Method Detail

premain

public static void premain(String agentArgs,
                           Instrumentation instP)

initializes agent.

Parameters:

agentArgs - the arguments (ignored)

instP - the instrumentation to use

sizeOf

public static long sizeOf(Object o)

Returns object size without member sub-objects.

Parameters:

o - object to get size of

Returns:

object size, 0 is agent not present

fullSizeOf

public static long fullSizeOf(Object obj)

Calculates full size of object iterating over its hierarchy graph.

Parameters:

obj - object to calculate size of

Returns:

object size

fullSizeOf

public static long fullSizeOf(Object obj,
                              Filter filter)

Calculates full size of object iterating over its hierarchy graph.

Parameters:

obj - object to calculate size of, filter does not skip this object

filter - the filter for the objects/fields, can be null

Returns:

object size

fullSizePerClass

public static Map<Class,Statistics> fullSizePerClass(Object obj)

Calculates size/count statistics of object iterating over its hierarchy graph, breaking it down per class.

Parameters:

obj - object to calculate size of

Returns:

the breakdown per class

fullSizePerClass

public static Map<Class,Statistics> fullSizePerClass(Object obj,
                                                     Filter filter)

Calculates size/count statistics of object iterating over its hierarchy graph, breaking it down per class.

Parameters:

obj - object to calculate size of, filter does not skip this object

filter - the filter for the objects/fields, can be null

Returns:

the breakdown per class