// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.testutil;
import com.google.devtools.build.lib.util.Clock;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/**
* A fake clock for testing.
*/
public final class ManualClock implements Clock {
private final AtomicLong currentTimeMillis = new AtomicLong();
@Override
public long currentTimeMillis() {
return currentTimeMillis.get();
}
/**
* Nano time should not be confused with wall time. Nano time is only mean to compute time
* differences. Because of this, we shift the time returned by 1000s, to test that the users
* of this class do not rely on nanoTime == currentTimeMillis.
*/
@Override
public long nanoTime() {
return TimeUnit.MILLISECONDS.toNanos(currentTimeMillis.get())
+ TimeUnit.SECONDS.toNanos(1000);
}
public long advanceMillis(long time) {
return currentTimeMillis.addAndGet(time);
}
}