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/*
* Copyright 2010 Proofpoint, Inc.
*
* Licensed 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 io.prestosql.jdbc.$internal.airlift.units;
import io.prestosql.jdbc.$internal.jackson.annotation.JsonCreator;
import io.prestosql.jdbc.$internal.jackson.annotation.JsonValue;
import java.util.Locale;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static io.prestosql.jdbc.$internal.airlift.units.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
import static java.util.concurrent.TimeUnit.DAYS;
import static java.util.concurrent.TimeUnit.HOURS;
import static java.util.concurrent.TimeUnit.MICROSECONDS;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.MINUTES;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
public final class Duration
implements Comparable
{
private static final Pattern PATTERN = Pattern.compile("^\\s*(\\d+(?:\\.\\d+)?)\\s*([a-zA-Z]+)\\s*$");
// We iterate over the TIME_UNITS constant in convertToMostSuccinctTimeUnit()
// instead of TimeUnit.values() as the latter results in non-trivial amount of memory
// allocation when that method is called in a tight loop. The reason is that the values()
// call allocates a new array at each call.
private static final TimeUnit[] TIME_UNITS = TimeUnit.values();
public static Duration nanosSince(long start)
{
return succinctNanos(System.nanoTime() - start);
}
public static Duration succinctNanos(long nanos)
{
return succinctDuration(nanos, NANOSECONDS);
}
public static Duration succinctDuration(double value, TimeUnit unit)
{
return new Duration(value, unit).convertToMostSuccinctTimeUnit();
}
private final double value;
private final TimeUnit unit;
public Duration(double value, TimeUnit unit)
{
checkArgument(!Double.isInfinite(value), "value is infinite");
checkArgument(!Double.isNaN(value), "value is not a number");
checkArgument(value >= 0, "value is negative");
requireNonNull(unit, "unit is null");
this.value = value;
this.unit = unit;
}
public long toMillis()
{
return roundTo(MILLISECONDS);
}
public double getValue()
{
return value;
}
public TimeUnit getUnit()
{
return unit;
}
public double getValue(TimeUnit timeUnit)
{
requireNonNull(timeUnit, "timeUnit is null");
return value * (millisPerTimeUnit(this.unit) * 1.0 / millisPerTimeUnit(timeUnit));
}
public long roundTo(TimeUnit timeUnit)
{
requireNonNull(timeUnit, "timeUnit is null");
double rounded = Math.floor(getValue(timeUnit) + 0.5d);
checkArgument(rounded <= Long.MAX_VALUE,
"size is too large to be represented in requested unit as a long");
return (long) rounded;
}
public Duration convertTo(TimeUnit timeUnit)
{
requireNonNull(timeUnit, "timeUnit is null");
return new Duration(getValue(timeUnit), timeUnit);
}
public Duration convertToMostSuccinctTimeUnit()
{
TimeUnit unitToUse = NANOSECONDS;
for (TimeUnit unitToTest : TIME_UNITS) {
// since time units are powers of ten, we can get rounding errors here, so fuzzy match
if (getValue(unitToTest) > 0.9999) {
unitToUse = unitToTest;
}
else {
break;
}
}
return convertTo(unitToUse);
}
@JsonValue
@Override
public String toString()
{
return toString(unit);
}
public String toString(TimeUnit timeUnit)
{
requireNonNull(timeUnit, "timeUnit is null");
double magnitude = getValue(timeUnit);
String timeUnitAbbreviation = timeUnitToString(timeUnit);
return String.format(Locale.ENGLISH, "%.2f%s", magnitude, timeUnitAbbreviation);
}
@JsonCreator
public static Duration valueOf(String duration)
throws IllegalArgumentException
{
requireNonNull(duration, "duration is null");
checkArgument(!duration.isEmpty(), "duration is empty");
Matcher matcher = PATTERN.matcher(duration);
if (!matcher.matches()) {
throw new IllegalArgumentException("duration is not a valid data duration string: " + duration);
}
double value = Double.parseDouble(matcher.group(1));
String unitString = matcher.group(2);
TimeUnit timeUnit = valueOfTimeUnit(unitString);
return new Duration(value, timeUnit);
}
@Override
public int compareTo(Duration o)
{
return Double.compare(getValue(MILLISECONDS), o.getValue(MILLISECONDS));
}
@Override
public boolean equals(Object o)
{
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Duration duration = (Duration) o;
return compareTo(duration) == 0;
}
@Override
public int hashCode()
{
double value = getValue(MILLISECONDS);
return Double.hashCode(value);
}
public static TimeUnit valueOfTimeUnit(String timeUnitString)
{
requireNonNull(timeUnitString, "timeUnitString is null");
switch (timeUnitString) {
case "ns":
return NANOSECONDS;
case "us":
return MICROSECONDS;
case "ms":
return MILLISECONDS;
case "s":
return SECONDS;
case "m":
return MINUTES;
case "h":
return HOURS;
case "d":
return DAYS;
default:
throw new IllegalArgumentException("Unknown time unit: " + timeUnitString);
}
}
public static String timeUnitToString(TimeUnit timeUnit)
{
requireNonNull(timeUnit, "timeUnit is null");
switch (timeUnit) {
case NANOSECONDS:
return "ns";
case MICROSECONDS:
return "us";
case MILLISECONDS:
return "ms";
case SECONDS:
return "s";
case MINUTES:
return "m";
case HOURS:
return "h";
case DAYS:
return "d";
default:
throw new IllegalArgumentException("Unsupported time unit " + timeUnit);
}
}
private static double millisPerTimeUnit(TimeUnit timeUnit)
{
switch (timeUnit) {
case NANOSECONDS:
return 1.0 / 1000000.0;
case MICROSECONDS:
return 1.0 / 1000.0;
case MILLISECONDS:
return 1;
case SECONDS:
return 1000;
case MINUTES:
return 1000 * 60;
case HOURS:
return 1000 * 60 * 60;
case DAYS:
return 1000 * 60 * 60 * 24;
default:
throw new IllegalArgumentException("Unsupported time unit " + timeUnit);
}
}
}
