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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package com.uber.m3.util;
/**
* Custom duration class to avoid Java 8 dependency.
*/
public class Duration implements Comparable {
/**
* A {@link Duration} of zero length.
*/
public static final Duration ZERO = new Duration(0);
/**
* The minimum {@link Duration} value.
*/
public static final Duration MIN_VALUE = new Duration(Long.MIN_VALUE);
/**
* The maximum {@link Duration} value.
*/
public static final Duration MAX_VALUE = new Duration(Long.MAX_VALUE);
/**
* The number of nanoseconds in a microsecond.
*/
public static final long NANOS_PER_MICRO = 1_000;
/**
* The number of nanoseconds in a millisecond.
*/
public static final long NANOS_PER_MILLI = 1_000_000;
/**
* The number of milliseconds in a second.
*/
public static final long MILLIS_PER_SECOND = 1_000;
/**
* The number of seconds in a minute.
*/
public static final long SECONDS_PER_MINUTE = 60;
/**
* The number of minutes in an hour.
*/
public static final long MINUTES_PER_HOUR = 60;
/**
* The number of nanoseconds in a second.
*/
public static final long NANOS_PER_SECOND = NANOS_PER_MILLI * MILLIS_PER_SECOND;
/**
* The number of nanoseconds in a minute.
*/
public static final long NANOS_PER_MINUTE = NANOS_PER_SECOND * SECONDS_PER_MINUTE;
/**
* The number of nanoseconds in an hour.
*/
public static final long NANOS_PER_HOUR = NANOS_PER_MINUTE * MINUTES_PER_HOUR;
// Max string length produced from a Duration is 25 when nanos == Long.MIN_VALUE
private static final int STRING_BUILDER_INIT_CAP = 25;
// Long.MAX_VALUE nanos > 290 years, which should be good enough
private final long nanos;
private Duration(long nanos) {
this.nanos = nanos;
}
/**
* Helper function to create a {@link Duration} using nanos.
* Truncates any fractional nanoseconds.
* @param nanos number of nanos in this {@link Duration}
* @return a {@link Duration} of these nanos
*/
public static Duration ofNanos(long nanos) {
return new Duration(nanos);
}
/**
* Helper function to create a {@link Duration} using millis.
* Truncates any fractional nanoseconds.
* @param millis number of millis in this {@link Duration}
* @return a {@link Duration} of these millis
*/
public static Duration ofMillis(double millis) {
checkMultiplicationLongOverflow(millis, NANOS_PER_MILLI);
return new Duration((long) (millis * NANOS_PER_MILLI));
}
/**
* Helper function to create a {@link Duration} using seconds.
* Truncates any fractional nanoseconds.
* @param seconds number of seconds in this {@link Duration}
* @return a {@link Duration} of these seconds
*/
public static Duration ofSeconds(double seconds) {
checkMultiplicationLongOverflow(seconds, NANOS_PER_SECOND);
return new Duration((long) (seconds * NANOS_PER_SECOND));
}
/**
* Helper function to create a {@link Duration} using minutes.
* Truncates any fractional nanoseconds.
* @param minutes number of minutes in this {@link Duration}
* @return a {@link Duration} of these minutes
*/
public static Duration ofMinutes(double minutes) {
checkMultiplicationLongOverflow(minutes, NANOS_PER_MINUTE);
return new Duration((long) (minutes * NANOS_PER_MINUTE));
}
/**
* Helper function to create a {@link Duration} using hours.
* Truncates any fractional nanoseconds.
* @param hours number of hours in this {@link Duration}
* @return a {@link Duration} of these hours
*/
public static Duration ofHours(double hours) {
checkMultiplicationLongOverflow(hours, NANOS_PER_HOUR);
return new Duration((long) (hours * NANOS_PER_HOUR));
}
/**
* Returns the number of whole milliseconds. Note that this function loses
* sub-millisecond precision. Used in functions that only support
* millisecond-level granularity.
* @return the number of whole milliseconds in this {@link Duration}
*/
public long toMillis() {
return nanos / NANOS_PER_MILLI;
}
/**
* Returns the number of seconds in this {@link Duration} as a double.
* @return the number of seconds in this {@link Duration}
*/
public long getNanos() {
return nanos;
}
/**
* Returns the number of seconds in this {@link Duration} as a double.
* @return the number of seconds in this {@link Duration}
*/
public double getSeconds() {
return (double) nanos / (double) NANOS_PER_SECOND;
}
/**
* Returns a {@link Duration} representing the time between two nanosecond-level numbers.
* @param startNanos start nanosecond time
* @param endNanos end nanosecond time
* @return a {@link Duration} between two nanosecond-level numbers
*/
public static Duration between(long startNanos, long endNanos) {
return new Duration(endNanos - startNanos);
}
/**
* Allows {@link Duration}s to be compared and sorted.
* @param other the other {@link Duration} to compare with
* @return -1 if this {@link Duration} is shorter than other; 0 if the same; 1 if longer
*/
@Override
public int compareTo(Duration other) {
return Long.compare(nanos, other.nanos);
}
/**
* This toString method is designed to mimic Go's time.Duration String(). In short, it is
* designed so that the least granular unit is used such that the first digit is not 0,
* e.g. 100µs instead of 0.1ms.
* @return String representation of this {@link Duration}
*/
@Override
public String toString() {
if (nanos == 0) {
return "0s";
} else if (nanos == Long.MIN_VALUE) {
// Return hard coded response as workaround because
// Math.abs(Long.MIN_VALUE) == Long.MIN_VALUE
return "-2562047h47m16.854775808s";
}
boolean isNegative = nanos < 0;
long nanosLocal = Math.abs(nanos);
long hours = nanosLocal / NANOS_PER_HOUR;
int minutes = (int) ((nanosLocal % NANOS_PER_HOUR) / NANOS_PER_MINUTE);
long secondsInNanos = nanosLocal % NANOS_PER_MINUTE;
int nanoOffset = (int) (nanosLocal % NANOS_PER_SECOND);
StringBuilder buf = new StringBuilder(STRING_BUILDER_INIT_CAP);
if (isNegative) {
buf.append("-");
}
if (hours != 0) {
buf.append(hours).append("h");
}
if (minutes != 0) {
buf.append(minutes).append("m");
}
if (secondsInNanos / NANOS_PER_SECOND > 0) {
appendDurationSegment(buf, secondsInNanos, 9, "s");
} else if (nanoOffset > 0) {
// If less than one second, print the highest unit that is >1
if (nanoOffset / NANOS_PER_MILLI > 0) {
appendDurationSegment(buf, nanoOffset, 6, "ms");
} else if (nanoOffset / NANOS_PER_MICRO > 0) {
appendDurationSegment(buf, nanoOffset % NANOS_PER_MILLI, 3, "µs");
} else {
buf.append(nanoOffset).append("ns");
}
}
return buf.toString();
}
private static void appendDurationSegment(
StringBuilder buf,
long durationPart,
int exponent,
String suffix
) {
buf.append(durationPart);
int decimalIdx = buf.length() - exponent;
// Remove trailing 0s if they come after decimal
while (decimalIdx < buf.length() && buf.charAt(buf.length() - 1) == '0') {
buf.setLength(buf.length() - 1);
}
if (decimalIdx < buf.length()) {
buf.insert(decimalIdx, '.');
}
buf.append(suffix);
}
@Override
public boolean equals(Object other) {
if (other == null) {
return false;
}
if (other == this) {
return true;
}
if (!(other instanceof Duration)) {
return false;
}
return nanos == ((Duration) other).nanos;
}
@Override
public int hashCode() {
return (int) (nanos ^ (nanos >>> 32));
}
/**
* Returns a {@link Duration} of the sum of this and another {@link Duration}.
* @param otherDuration the other {@link Duration} to add to
* @return a {@link Duration} of the sum of this and another {@link Duration}
*/
public Duration add(Duration otherDuration) {
checkAdditionLongOverflow(nanos, otherDuration.nanos);
return new Duration(nanos + otherDuration.nanos);
}
/**
* Returns a {@link Duration} of the product of this with a factor.
* @param factor the factor to multiply this with
* @return a {@link Duration} of the product of this with a factor
*/
public Duration multiply(double factor) {
checkMultiplicationLongOverflow(nanos, factor);
long newNanos = (long) (nanos * factor);
// Throw if multiplying by the given factor will result in a fractional nanosecond
if (newNanos != nanos * factor) {
throw new IllegalArgumentException(
"Unable to create a precise Duration with the specified factor"
);
}
return new Duration(newNanos);
}
// Check whether addition will cause long overflow
private static void checkAdditionLongOverflow(long input1, long input2) {
long sum = input1 + input2;
if (((input1 ^ sum) & (input2 ^ sum)) < 0) {
throw new ArithmeticException(
String.format("Addition of %d and %d will cause long overflow", input1, input2)
);
}
}
// Check whether the input to static factory methods will cause long overflow.
private static void checkMultiplicationLongOverflow(double input, double factor) {
if (factor < 0) {
throw new IllegalArgumentException("factor cannot be negative");
}
if (input > 0 && input > Long.MAX_VALUE / factor
|| input < 0 && input < Long.MIN_VALUE / factor) {
throw new ArithmeticException("Duration of this magnitude not supported");
}
}
}
