Package org.apache.hadoop.yarn.server.timelineservice.storage.common

Class LongConverter

java.lang.Object

org.apache.hadoop.yarn.server.timelineservice.storage.common.LongConverter

All Implemented Interfaces:

java.io.Serializable, java.util.Comparator<java.lang.Number>, NumericValueConverter, ValueConverter

public final class LongConverter
extends java.lang.Object
implements NumericValueConverter, java.io.Serializable

Encodes a value by interpreting it as a Long and converting it to bytes and decodes a set of bytes as a Long.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
LongConverter()

Method Summary

Modifier and Type	Method	Description
java.lang.Number	add(java.lang.Number num1, java.lang.Number num2, java.lang.Number... numbers)	Adds two or more numbers.
int	compare(java.lang.Number num1, java.lang.Number num2)	Compares two numbers as longs.
java.lang.Object	decodeValue(byte[] bytes)	Decode a byte array and convert it into an object depending on the converter implementation.
byte[]	encodeValue(java.lang.Object value)	Encode an object as a byte array depending on the converter implementation.
static long	invertLong(long key)	Converts a timestamp into it's inverse timestamp to be used in (row) keys where we want to have the most recent timestamp in the top of the table (scans start at the most recent timestamp first).

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

LongConverter

public LongConverter()

Method Detail

encodeValue

public byte[] encodeValue(java.lang.Object value)
                   throws java.io.IOException

Description copied from interface: ValueConverter

Encode an object as a byte array depending on the converter implementation.

Specified by:

encodeValue in interface ValueConverter

Parameters:

value - Value to be encoded.

Returns:

a byte array

Throws:

java.io.IOException - if any problem is encountered while encoding.

decodeValue

public java.lang.Object decodeValue(byte[] bytes)
                             throws java.io.IOException

Description copied from interface: ValueConverter

Decode a byte array and convert it into an object depending on the converter implementation.

Specified by:

decodeValue in interface ValueConverter

Parameters:

bytes - Byte array to be decoded.

Returns:

an object

Throws:

java.io.IOException - if any problem is encountered while decoding.

compare

public int compare(java.lang.Number num1,
                   java.lang.Number num2)

Compares two numbers as longs. If either number is null, it will be taken as 0.

Specified by:

compare in interface java.util.Comparator<java.lang.Number>

Parameters:

num1 - the first Long to compare.

num2 - the second Long to compare.

Returns:

-1 if num1 is less than num2, 0 if num1 is equal to num2 and 1 if num1 is greater than num2.

add

public java.lang.Number add(java.lang.Number num1,
                            java.lang.Number num2,
                            java.lang.Number... numbers)

Description copied from interface: NumericValueConverter

Adds two or more numbers. If either of the numbers are null, it is taken as 0.

Specified by:

add in interface NumericValueConverter

Parameters:

num1 - the first number to add.

num2 - the second number to add.

numbers - Rest of the numbers to be added.

Returns:

result after adding up the numbers.

invertLong

public static long invertLong(long key)

Converts a timestamp into it's inverse timestamp to be used in (row) keys where we want to have the most recent timestamp in the top of the table (scans start at the most recent timestamp first).

Parameters:

key - value to be inverted so that the latest version will be first in a scan.

Returns:

inverted long