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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.yarn.util;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import java.math.BigInteger;
import java.util.*;
/**
* A util to convert values in one unit to another. Units refers to whether
* the value is expressed in pico, nano, etc.
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class UnitsConversionUtil {
/**
* Helper class for encapsulating conversion values.
*/
public static class Converter {
private long numerator;
private long denominator;
Converter(long n, long d) {
this.numerator = n;
this.denominator = d;
}
}
private static final String[] UNITS = {"p", "n", "u", "m", "", "k", "M", "G",
"T", "P", "Ki", "Mi", "Gi", "Ti", "Pi"};
private static final List SORTED_UNITS = Arrays.asList(UNITS);
public static final Set KNOWN_UNITS = createKnownUnitsSet();
private static final Converter PICO =
new Converter(1L, 1000L * 1000L * 1000L * 1000L);
private static final Converter NANO =
new Converter(1L, 1000L * 1000L * 1000L);
private static final Converter MICRO = new Converter(1L, 1000L * 1000L);
private static final Converter MILLI = new Converter(1L, 1000L);
private static final Converter BASE = new Converter(1L, 1L);
private static final Converter KILO = new Converter(1000L, 1L);
private static final Converter MEGA = new Converter(1000L * 1000L, 1L);
private static final Converter GIGA =
new Converter(1000L * 1000L * 1000L, 1L);
private static final Converter TERA =
new Converter(1000L * 1000L * 1000L * 1000L, 1L);
private static final Converter PETA =
new Converter(1000L * 1000L * 1000L * 1000L * 1000L, 1L);
private static final Converter KILO_BINARY = new Converter(1024L, 1L);
private static final Converter MEGA_BINARY = new Converter(1024L * 1024L, 1L);
private static final Converter GIGA_BINARY =
new Converter(1024L * 1024L * 1024L, 1L);
private static final Converter TERA_BINARY =
new Converter(1024L * 1024L * 1024L * 1024L, 1L);
private static final Converter PETA_BINARY =
new Converter(1024L * 1024L * 1024L * 1024L * 1024L, 1L);
private static Set createKnownUnitsSet() {
Set ret = new HashSet<>();
ret.addAll(Arrays.asList(UNITS));
return ret;
}
private static Converter getConverter(String unit) {
switch (unit) {
case "p":
return PICO;
case "n":
return NANO;
case "u":
return MICRO;
case "m":
return MILLI;
case "":
return BASE;
case "k":
return KILO;
case "M":
return MEGA;
case "G":
return GIGA;
case "T":
return TERA;
case "P":
return PETA;
case "Ki":
return KILO_BINARY;
case "Mi":
return MEGA_BINARY;
case "Gi":
return GIGA_BINARY;
case "Ti":
return TERA_BINARY;
case "Pi":
return PETA_BINARY;
default:
throw new IllegalArgumentException(
"Unknown unit '" + unit + "'. Known units are " + KNOWN_UNITS);
}
}
/**
* Converts a value from one unit to another. Supported units can be obtained
* by inspecting the KNOWN_UNITS set.
*
* @param fromUnit the unit of the from value
* @param toUnit the target unit
* @param fromValue the value you wish to convert
* @return the value in toUnit
*/
public static long convert(String fromUnit, String toUnit, long fromValue) {
if (toUnit == null || fromUnit == null) {
throw new IllegalArgumentException("One or more arguments are null");
}
if (fromUnit.equals(toUnit)) {
return fromValue;
}
Converter fc = getConverter(fromUnit);
Converter tc = getConverter(toUnit);
long numerator = fc.numerator * tc.denominator;
long denominator = fc.denominator * tc.numerator;
long numeratorMultiplierLimit = Long.MAX_VALUE / numerator;
if (numerator < denominator) {
if (numeratorMultiplierLimit < fromValue) {
String overflowMsg =
"Converting " + fromValue + " from '" + fromUnit + "' to '" + toUnit
+ "' will result in an overflow of Long";
throw new IllegalArgumentException(overflowMsg);
}
return (fromValue * numerator) / denominator;
}
if (numeratorMultiplierLimit > fromValue) {
return (numerator * fromValue) / denominator;
}
long tmp = numerator / denominator;
if ((Long.MAX_VALUE / tmp) < fromValue) {
String overflowMsg =
"Converting " + fromValue + " from '" + fromUnit + "' to '" + toUnit
+ "' will result in an overflow of Long";
throw new IllegalArgumentException(overflowMsg);
}
return fromValue * tmp;
}
/**
* Compare a value in a given unit with a value in another unit. The return
* value is equivalent to the value returned by compareTo.
*
* @param unitA first unit
* @param valueA first value
* @param unitB second unit
* @param valueB second value
* @return +1, 0 or -1 depending on whether the relationship is greater than,
* equal to or lesser than
*/
public static int compare(String unitA, long valueA, String unitB,
long valueB) {
checkUnitArgument(unitA);
checkUnitArgument(unitB);
if (unitA.equals(unitB)) {
return Long.compare(valueA, valueB);
}
Converter unitAC = getConverter(unitA);
Converter unitBC = getConverter(unitB);
int unitAPos = SORTED_UNITS.indexOf(unitA);
int unitBPos = SORTED_UNITS.indexOf(unitB);
try {
long tmpA = valueA;
long tmpB = valueB;
if (unitAPos < unitBPos) {
tmpB = convert(unitB, unitA, valueB);
} else {
tmpA = convert(unitA, unitB, valueA);
}
return Long.compare(tmpA, tmpB);
} catch (IllegalArgumentException ie) {
BigInteger tmpA = BigInteger.valueOf(valueA);
BigInteger tmpB = BigInteger.valueOf(valueB);
if (unitAPos < unitBPos) {
tmpB = tmpB.multiply(BigInteger.valueOf(unitBC.numerator));
tmpB = tmpB.multiply(BigInteger.valueOf(unitAC.denominator));
tmpB = tmpB.divide(BigInteger.valueOf(unitBC.denominator));
tmpB = tmpB.divide(BigInteger.valueOf(unitAC.numerator));
} else {
tmpA = tmpA.multiply(BigInteger.valueOf(unitAC.numerator));
tmpA = tmpA.multiply(BigInteger.valueOf(unitBC.denominator));
tmpA = tmpA.divide(BigInteger.valueOf(unitAC.denominator));
tmpA = tmpA.divide(BigInteger.valueOf(unitBC.numerator));
}
return tmpA.compareTo(tmpB);
}
}
private static void checkUnitArgument(String unit) {
if (unit == null) {
throw new IllegalArgumentException("Unit cannot be null");
} else if (!KNOWN_UNITS.contains(unit)) {
throw new IllegalArgumentException("Unknown unit '" + unit + "'");
}
}
/**
* Compare a unit to another unit.
*
* Examples:
* 1. 'm' (milli) is smaller than 'k' (kilo), so compareUnits("m", "k")
* will return -1.
* 2. 'M' (MEGA) is greater than 'k' (kilo), so compareUnits("M", "k") will
* return 1.
*
* @param unitA first unit
* @param unitB second unit
* @return +1, 0 or -1 depending on whether the relationship between units
* is smaller than,
* equal to or lesser than.
*/
public static int compareUnits(String unitA, String unitB) {
checkUnitArgument(unitA);
checkUnitArgument(unitB);
int unitAPos = SORTED_UNITS.indexOf(unitA);
int unitBPos = SORTED_UNITS.indexOf(unitB);
return Integer.compare(unitAPos, unitBPos);
}
}
