io.crate.types

Interface FixedWidthType

All Known Implementing Classes:

AverageAggregation.AverageStateType, BooleanType, ByteType, CountAggregation.LongStateType, DoubleType, FloatType, GeometricMeanAggregation.GeometricMeanStateType, GeoPointType, IntegerType, LongType, ShortType, StandardDeviationAggregation.StdDevStateType, TimestampType, VarianceAggregation.VarianceStateType

public interface FixedWidthType

A type that has a fixed size for every value

Method Summary

Modifier and Type	Method and Description
int	fixedSize() The fixed amount of memory a value object instance of type t requires.

Method Detail

fixedSize

int fixedSize()

The fixed amount of memory a value object instance of type t requires. (t is the type described by our DataType interface or something that implements FixedWidthType)

Implementations here may not be 100% accurate because sizes may vary between JVM implementations and then there is also stuff like padding and other JVM magic.

See also: https://blogs.oracle.com/jrose/entry/fixnums_in_the_vm http://www.javaworld.com/article/2077496/testing-debugging/java-tip-130--do-you-know-your-data-size-.html