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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.test;
import com.yahoo.component.annotation.Inject;
import java.time.Clock;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAmount;
import java.util.concurrent.atomic.AtomicReference;
/**
* A clock which initially has the time of its creation but can only be advanced by calling advance
*
* @author bratseth
*/
public class ManualClock extends Clock {
private final AtomicReference<Instant> currentTime = new AtomicReference<>(Instant.now());
@Inject
public ManualClock() {}
public ManualClock(String utcIsoTime) {
this(at(utcIsoTime));
}
public ManualClock(Instant currentTime) {
setInstant(currentTime);
}
public void advance(TemporalAmount temporal) {
currentTime.updateAndGet(time -> time.plus(temporal));
}
/** Move time backwards by the given amount */
public void retreat(TemporalAmount temporal) {
currentTime.updateAndGet(time -> time.minus(temporal));
}
public final void setInstant(Instant time) {
currentTime.set(time);
}
@Override
public Instant instant() { return currentTime.get(); }
@Override
public ZoneId getZone() { return ZoneOffset.UTC; }
@Override
public Clock withZone(ZoneId zone) { return this; }
@Override
public long millis() { return instant().toEpochMilli(); }
public static Instant at(String utcIsoTime) {
return LocalDateTime.parse(utcIsoTime, DateTimeFormatter.ISO_DATE_TIME).atZone(ZoneOffset.UTC).toInstant();
}
@Override
public String toString() {
return "ManualClock{" +
"currentTime=" + currentTime +
'}';
}
}
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