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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.time;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
/**
* A TimeBudget can be used to track the time of an ongoing operation with a timeout.
*
* @author hakon
*/
public class TimeBudget {
private final Clock clock;
private final Instant start;
private final Duration timeout;
/** Returns a TimeBudget with a start time of now, and with the given timeout. */
public static TimeBudget fromNow(Clock clock, Duration timeout) {
return new TimeBudget(clock, clock.instant(), timeout);
}
private TimeBudget(Clock clock, Instant start, Duration timeout) {
this.clock = clock;
this.start = start;
this.timeout = makeNonNegative(timeout);
}
/** Returns time since start. */
public Duration timePassed() {
return nonNegativeBetween(start, clock.instant());
}
/** Returns the original timeout. */
public Duration originalTimeout() {
return timeout;
}
/**
* Returns the time until deadline.
*
* @return time until deadline. It's toMillis() is guaranteed to be positive.
* @throws TimeoutException if the deadline has been reached or passed.
*/
public Duration timeLeftOrThrow() {
Instant now = clock.instant();
Duration left = Duration.between(now, start.plus(timeout));
if (left.toMillis() <= 0) {
throw new TimeoutException("Time since start " + nonNegativeBetween(start, now) +
" exceeds timeout " + timeout);
}
return left;
}
private static Duration nonNegativeBetween(Instant start, Instant end) {
return makeNonNegative(Duration.between(start, end));
}
private static Duration makeNonNegative(Duration duration) {
return duration.isNegative() ? Duration.ZERO : duration;
}
}
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