blasd.apex.core.memory

Class ApexMemoryHelper

java.lang.Object

blasd.apex.core.memory.ApexMemoryHelper

All Implemented Interfaces:

IApexMemoryConstants

public class ApexMemoryHelper
extends Object
implements IApexMemoryConstants

This class helps reference-sharing

Author:

Benoit Lacelle

Field Summary

Fields

Modifier and Type	Field and Description
static int	JVM_BYTES_PER_CHAR
static int	JVM_MEMORY_CHUNK
static int	JVM_STRING_HEADER
protected static org.slf4j.Logger	LOGGER

Fields inherited from interface blasd.apex.core.memory.IApexMemoryConstants

CHAR, DOUBLE, FLOAT, GB, GB_INT, INT, KB, KB_INT, LONG, MB, MB_INT, OBJECT, TB, TB_INT

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ApexMemoryHelper()

Method Summary

Modifier and Type	Method and Description
static void	deepSize(Instrumentation instrumentation, IntPredicate identities, LongAdder totalSize, Object object)
static long	deepSize(Object object)
static long	deepSize(Object object, IntPredicate identityPredicate)
static long	deepSizeWithBloomFilter(Object object, long expectedObjectCardinality)
static long	getDoubleMemory()
static long	getObjectArrayMemory(Object asArray)
static long	getObjectArrayMemory(Object[] asArray)
static long	getStringMemory(CharSequence existingRef)
static long	memoryAsLong(String targetMax)
static String	memoryAsString(long bytes)
static long	positivePack(int i1, int i2) It might be useful to have an long<->(int,int) packing guaranteeing both integers to be positive if the long is positive
static int	positiveUnpack1(long packed)
static int	positiveUnpack2(long packed)
static void	recursiveSize(Instrumentation instrumentation, IntPredicate identities, LongAdder totalSize, Object object) Deprecated.
static long	recursiveSize(Object object) Deprecated. renamed to deepSize
static long	recursiveSize(Object object, IntPredicate identityPredicate)
static long	recursiveSizeWithBloomFilter(Object object, long expectedObjectCardinality) Deprecated.

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

protected static final org.slf4j.Logger LOGGER

JVM_MEMORY_CHUNK

public static final int JVM_MEMORY_CHUNK

See Also:

Constant Field Values

JVM_BYTES_PER_CHAR

public static final int JVM_BYTES_PER_CHAR

See Also:

Constant Field Values

JVM_STRING_HEADER

public static final int JVM_STRING_HEADER

See Also:

Constant Field Values

Constructor Detail

ApexMemoryHelper

protected ApexMemoryHelper()

Method Detail

getStringMemory

public static long getStringMemory(CharSequence existingRef)

recursiveSize

@Deprecated
public static long recursiveSize(Object object)

Deprecated. renamed to deepSize

deepSize

public static long deepSize(Object object)

Parameters:

object - the object to analyze

Returns:

the number of bytes consumed by given objects, taking in account the references objects

recursiveSize

public static long recursiveSize(Object object,
                                 IntPredicate identityPredicate)

deepSize

public static long deepSize(Object object,
                            IntPredicate identityPredicate)

Parameters:

object -

identityPredicate - a predicate returning true if it is the first encounter of given object. It may return false even if an object has not been considered before, woult it be because the identity policy is not guaranteed (e.g. we rely on a BloomFilter) or if we want to exclude some objects

Returns:

Long.MAX_VALUE if the Instrumentation agent is not available. Else an estimation of the memory consumption.

recursiveSizeWithBloomFilter

@Deprecated
public static long recursiveSizeWithBloomFilter(Object object,
                                                            long expectedObjectCardinality)

Deprecated.

deepSizeWithBloomFilter

public static long deepSizeWithBloomFilter(Object object,
                                           long expectedObjectCardinality)

recursiveSize

@Deprecated
public static void recursiveSize(Instrumentation instrumentation,
                                             IntPredicate identities,
                                             LongAdder totalSize,
                                             Object object)

Deprecated.

deepSize

public static void deepSize(Instrumentation instrumentation,
                            IntPredicate identities,
                            LongAdder totalSize,
                            Object object)

Parameters:

instrumentation - an Instrumentation able to provide the memory weight of given object

identities - an identityHashSet where to collect already handlded objects

totalSize - the LongAdder where to accumulate the memory

object - the object to analyse

getDoubleMemory

public static long getDoubleMemory()

getObjectArrayMemory

public static long getObjectArrayMemory(Object[] asArray)

getObjectArrayMemory

public static long getObjectArrayMemory(Object asArray)

positivePack

public static final long positivePack(int i1,
                                      int i2)

It might be useful to have an long<->(int,int) packing guaranteeing both integers to be positive if the long is positive

positiveUnpack1

public static final int positiveUnpack1(long packed)

positiveUnpack2

public static final int positiveUnpack2(long packed)

memoryAsLong

public static long memoryAsLong(String targetMax)

memoryAsString

public static String memoryAsString(long bytes)