Package com.infilos.utils.sizes

Class ObjectSizeCalculator

java.lang.Object

com.infilos.utils.sizes.ObjectSizeCalculator

public class ObjectSizeCalculator
extends Object

Constructor Summary

Constructors

Constructor	Description
ObjectSizeCalculator(MemoryLayoutSpec memoryLayoutSpec)	Creates an object size calculator that can calculate object sizes for a given memoryLayoutSpecification.

Method Summary

Modifier and Type	Method	Description
long	calculateObjectSize(Object obj)	Given an object, returns the total allocated size, in bytes, of the object and all other objects reachable from it.

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectSizeCalculator

public ObjectSizeCalculator(MemoryLayoutSpec memoryLayoutSpec)

Creates an object size calculator that can calculate object sizes for a given memoryLayoutSpecification.

Parameters:

memoryLayoutSpec - a description of the JVM memory layout.

Method Detail

calculateObjectSize

public long calculateObjectSize(Object obj)

Given an object, returns the total allocated size, in bytes, of the object and all other objects reachable from it.

Parameters:

obj - the object; can be null. Passing in a Class object doesn't do anything special, it measures the size of all objects reachable through it (which will include its class loader, and by extension, all other Class objects loaded by the same loader, and all the parent class loaders). It doesn't provide the size of the static fields in the JVM class that the Class object represents.

Returns:

the total allocated size of the object and all other objects it retains.