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com.tangosol.util
Class SimpleMapIndex.IndexCalculator

java.lang.Object
com.tangosol.util.Base
com.tangosol.net.cache.SimpleMemoryCalculator
com.tangosol.util.SimpleMapIndex.IndexCalculator

All Implemented Interfaces:

ConfigurableCacheMap.UnitCalculator, OldCache.UnitCalculator

Enclosing class:

SimpleMapIndex

public static class SimpleMapIndex.IndexCalculator

extends SimpleMemoryCalculator

A stateful calculator used to calculate the cost of a homogeneous index (holding all values of a single type).

Nested Class Summary

static class

SimpleMapIndex.IndexCalculator.CalculatorState The CalculatorState identifies the method used by the calculator to calculate the cost of a key or a value type.

Field Summary

protected static int	DEFAULT_SIZE The default size of an entry used if the calculator is unable to calculate the size.
protected ConfigurableCacheMap.UnitCalculator	m_calculator The ConfigurableCacheMap.UnitCalculator used to calculate the size of SimpleMapIndex.IndexCalculator.CalculatorState.CONFIGURED types. into Binary to approximate the size.
protected int	m_cbFixed If the state is SimpleMapIndex.IndexCalculator.CalculatorState.FIXED, contains a cached cost per instance.
protected Converter	m_converter The Converter used to convert SimpleMapIndex.IndexCalculator.CalculatorState.UNKNOWN types into Binary to approximate the size.
protected SimpleMapIndex	m_index The container index.
protected SimpleMapIndex.IndexCalculator.CalculatorState	m_state The SimpleMapIndex.IndexCalculator.CalculatorState of this calculator.

Fields inherited from class com.tangosol.net.cache.SimpleMemoryCalculator

MAP_FIXED_SIZES, SIZE_BASIC_OBJECT, SIZE_BIGDECIMAL, SIZE_BIGINTEGER, SIZE_BINARY, SIZE_BOOLEAN, SIZE_BYTE, SIZE_CHARACTER, SIZE_DATE, SIZE_DOUBLE, SIZE_ENTRY, SIZE_FLOAT, SIZE_INTEGER, SIZE_LONG, SIZE_OBJECT, SIZE_OBJECT_REF, SIZE_SHORT, SIZE_STRING, SIZE_TIMESTAMP

Constructor Summary

SimpleMapIndex.IndexCalculator(BackingMapContext ctx, SimpleMapIndex index)
Construct an IndexCalculator which allows for conversion of items into a serialized format.

Method Summary

protected SimpleMapIndex.IndexCalculator.CalculatorState	getCalculatorState(java.lang.Class clz) Determine which method to use to count the size of an instance of the specified class.
protected Converter	getConverter() Return the converter used by this IndexCalculator, or null.
protected SimpleMapIndex.IndexCalculator.CalculatorState	initialize(java.lang.Object o) Initialize the calculator based on the type of the specified object assuming that the indexed values are homogeneous (of the same type).
int	sizeOf(java.lang.Object o) Estimate the number of bytes of memory consumed by the given object.

Methods inherited from class com.tangosol.net.cache.SimpleMemoryCalculator

calculateShallowSize, calculateUnits, getName, main, padMemorySize, sizeOf

Field Detail

m_index

protected SimpleMapIndex m_index

The container index. Since we use an enum for the state we have to make this inner class a static one and pass the parent index into the constructor.

m_state

protected SimpleMapIndex.IndexCalculator.CalculatorState m_state

The SimpleMapIndex.IndexCalculator.CalculatorState of this calculator.

m_cbFixed

protected int m_cbFixed

If the state is SimpleMapIndex.IndexCalculator.CalculatorState.FIXED, contains a cached cost per instance.

m_converter

protected final Converter m_converter

The Converter used to convert SimpleMapIndex.IndexCalculator.CalculatorState.UNKNOWN types into Binary to approximate the size.

m_calculator

protected final ConfigurableCacheMap.UnitCalculator m_calculator

The ConfigurableCacheMap.UnitCalculator used to calculate the size of SimpleMapIndex.IndexCalculator.CalculatorState.CONFIGURED types. into Binary to approximate the size. The calculator is initialized iff the BackingMapContext associated with the index represents a ConfigurableCacheMap

DEFAULT_SIZE

protected static final int DEFAULT_SIZE

The default size of an entry used if the calculator is unable to calculate the size.

See Also:

Constant Field Values

Constructor Detail

SimpleMapIndex.IndexCalculator

public SimpleMapIndex.IndexCalculator(BackingMapContext ctx,
                                      SimpleMapIndex index)

Construct an IndexCalculator which allows for conversion of items into a serialized format. The calculator may use the size of the serialized value representation to approximate the size of indexed values.

Note: ExternalizableHelper.CONVERTER_TO_BINARY can be used to convert Serializable or ExternalizableLite objects

Parameters:

ctx - the BackingMapContext associated with the indexed cache

index - the container index for this calculator (used only for logging)

Method Detail

getCalculatorState

protected SimpleMapIndex.IndexCalculator.CalculatorState getCalculatorState(java.lang.Class clz)

Determine which method to use to count the size of an instance of the specified class.

Parameters:

clz - the type of objects that this calculator will operate on

Returns:

the SimpleMapIndex.IndexCalculator.CalculatorState

initialize

protected SimpleMapIndex.IndexCalculator.CalculatorState initialize(java.lang.Object o)

Initialize the calculator based on the type of the specified object assuming that the indexed values are homogeneous (of the same type).

Parameters:

o - an instance of the value to calculate the size for

Returns:

the new SimpleMapIndex.IndexCalculator.CalculatorState

sizeOf

public int sizeOf(java.lang.Object o)

Estimate the number of bytes of memory consumed by the given object.

The calculation is based on the class of the given object, with reference types assumed to be aligned on a 16-byte boundary:

Class	Size
boolean	1
byte	1
short	2
char	2
int	4
long	8
float	4
double	8
Object	SimpleMemoryCalculator.SIZE_OBJECT
Boolean	SimpleMemoryCalculator.SIZE_OBJECT + 1
Byte	SimpleMemoryCalculator.SIZE_OBJECT + 1
Short	SimpleMemoryCalculator.SIZE_OBJECT + 2
Character	SimpleMemoryCalculator.SIZE_OBJECT + 2
Integer	SimpleMemoryCalculator.SIZE_OBJECT + 4
Long	SimpleMemoryCalculator.SIZE_OBJECT + 8
Float	SimpleMemoryCalculator.SIZE_OBJECT + 4
Double	SimpleMemoryCalculator.SIZE_OBJECT + 8
BigInteger	SimpleMemoryCalculator.SIZE_OBJECT + 48
BigDecimal	SimpleMemoryCalculator.SIZE_OBJECT + 4 + SimpleMemoryCalculator.SIZE_OBJECT_REF + SimpleMemoryCalculator.SIZE_BIGINTEGER
Date	SimpleMemoryCalculator.SIZE_OBJECT + SimpleMemoryCalculator.SIZE_OBJECT_REF + 8
Time	SimpleMemoryCalculator.SIZE_OBJECT + SimpleMemoryCalculator.SIZE_OBJECT_REF + 8
Timestamp	SimpleMemoryCalculator.SIZE_OBJECT + SimpleMemoryCalculator.SIZE_OBJECT_REF + 12
Binary	SimpleMemoryCalculator.SIZE_BINARY + array
String	SimpleMemoryCalculator.SIZE_STRING + array
array	SimpleMemoryCalculator.SIZE_OBJECT + 4 + [element size]*length()

Overrides:

sizeOf in class SimpleMemoryCalculator

Parameters:

o - the object to measure the size of

Returns:

an estimate of the number of bytes required to store the given object in memory

getConverter

protected Converter getConverter()

Return the converter used by this IndexCalculator, or null.

Returns:

the converter used by this IndexCalculator

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