org.github.jamm

Class MemoryMeter

java.lang.Object

org.github.jamm.MemoryMeter

public class MemoryMeter
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MemoryMeter.Guess

Constructor Summary

Constructors

Constructor and Description
MemoryMeter()

Method Summary

Methods

Modifier and Type	Method and Description
long	countChildren(Object object)
static boolean	hasInstrumentation()
long	measure(Object object)
long	measureDeep(Object object)
MemoryMeter	omitSharedBufferOverhead()
static void	premain(String options, Instrumentation inst)
MemoryMeter	withGuessing(MemoryMeter.Guess guess)
MemoryMeter	withTrackerProvider(Callable<Set<Object>> trackerProvider)

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryMeter

public MemoryMeter()

Method Detail

premain

public static void premain(String options,
           Instrumentation inst)

hasInstrumentation

public static boolean hasInstrumentation()

withTrackerProvider

public MemoryMeter withTrackerProvider(Callable<Set<Object>> trackerProvider)

Parameters:

trackerProvider -

Returns:

a MemoryMeter with the given provider

omitSharedBufferOverhead

public MemoryMeter omitSharedBufferOverhead()

Returns:

a MemoryMeter that only counts the bytes remaining in a ByteBuffer in measureDeep, rather than the full size of the backing array. TODO: handle other types of Buffers

withGuessing

public MemoryMeter withGuessing(MemoryMeter.Guess guess)

Returns:

a MemoryMeter that permits guessing the size of objects if instrumentation isn't enabled

measure

public long measure(Object object)

Returns:

the shallow memory usage of @param object

Throws:

NullPointerException - if object is null

measureDeep

public long measureDeep(Object object)

Returns:

the memory usage of @param object including referenced objects

Throws:

NullPointerException - if object is null

countChildren

public long countChildren(Object object)

Returns:

the number of child objects referenced by @param object

Throws:

NullPointerException - if object is null