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// Copyright (C) 2015 The Android Open Source Project
//
// 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 com.google.gerrit.testing;
import static com.google.common.base.Preconditions.checkState;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import com.google.gerrit.server.util.time.TimeUtil;
import java.sql.Timestamp;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.Month;
import java.time.ZoneOffset;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/** Static utility methods for dealing with dates and times in tests. */
public class TestTimeUtil {
public static final Instant START =
LocalDateTime.of(2009, Month.SEPTEMBER, 30, 17, 0, 0)
.atOffset(ZoneOffset.ofHours(-4))
.toInstant();
private static Long clockStepMs;
private static AtomicLong clockMs;
/**
* Reset the clock to a known start point, then set the clock step.
*
* <p>The clock is initially set to 2009/09/30 17:00:00 -0400.
*
* @param clockStep amount to increment clock by on each lookup.
* @param clockStepUnit time unit for {@code clockStep}.
*/
public static synchronized void resetWithClockStep(long clockStep, TimeUnit clockStepUnit) {
// Set an arbitrary start point so tests are more repeatable.
clockMs = new AtomicLong(START.toEpochMilli());
setClockStep(clockStep, clockStepUnit);
}
/**
* Set the clock step used by {@link com.google.gerrit.server.util.time.TimeUtil}.
*
* @param clockStep amount to increment clock by on each lookup.
* @param clockStepUnit time unit for {@code clockStep}.
*/
public static synchronized void setClockStep(long clockStep, TimeUnit clockStepUnit) {
checkState(clockMs != null, "call resetWithClockStep first");
clockStepMs = MILLISECONDS.convert(clockStep, clockStepUnit);
TimeUtil.setCurrentMillisSupplier(() -> clockMs.getAndAdd(clockStepMs));
}
/** {@link AutoCloseable} handle returned by {@link #withClockStep(long, TimeUnit)}. */
public static class TempClockStep implements AutoCloseable {
private final long oldClockStepMs;
private TempClockStep(long clockStep, TimeUnit clockStepUnit) {
oldClockStepMs = clockStepMs;
setClockStep(clockStep, clockStepUnit);
}
@Override
public void close() {
setClockStep(oldClockStepMs, TimeUnit.MILLISECONDS);
}
}
/**
* Set a clock step only for the scope of a single try-with-resources block.
*
* @param clockStep amount to increment clock by on each lookup.
* @param clockStepUnit time unit for {@code clockStep}.
* @return {@link AutoCloseable} handle which resets the clock step to its old value on close.
*/
public static TempClockStep withClockStep(long clockStep, TimeUnit clockStepUnit) {
return new TempClockStep(clockStep, clockStepUnit);
}
/**
* Freeze the clock to stop moving only for the scope of a single try-with-resources block.
*
* @return {@link AutoCloseable} handle which resets the clock step to its old value on close.
*/
public static TempClockStep freezeClock() {
return withClockStep(0, TimeUnit.SECONDS);
}
/**
* Set the clock to a specific timestamp.
*
* @param ts time to set
*/
public static synchronized void setClock(Timestamp ts) {
checkState(clockMs != null, "call resetWithClockStep first");
clockMs.set(ts.getTime());
}
/**
* Increment the clock once by a given amount.
*
* @param clockStep amount to increment clock by.
* @param clockStepUnit time unit for {@code clockStep}.
*/
public static synchronized void incrementClock(long clockStep, TimeUnit clockStepUnit) {
checkState(clockMs != null, "call resetWithClockStep first");
clockMs.addAndGet(clockStepUnit.toMillis(clockStep));
}
/** Reset the clock to use the actual system clock. */
public static synchronized void useSystemTime() {
clockMs = null;
TimeUtil.resetCurrentMillisSupplier();
}
private TestTimeUtil() {}
}
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