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// Copyright 2014 Google Inc. 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.util;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.util.Clock;
import com.google.devtools.build.lib.util.JavaClock;
/**
* Provides the clock implementation used by Blaze, which is {@link JavaClock}
* by default, but can be overridden at runtime. Note that if you set this
* clock, you also have to set the clock used by the Profiler.
*/
@ThreadSafe
public abstract class BlazeClock {
private BlazeClock() {
}
private static volatile Clock instance = new JavaClock();
/**
* Returns singleton instance of the clock
*/
public static Clock instance() {
return instance;
}
/**
* Overrides default clock instance.
*/
public static synchronized void setClock(Clock clock) {
instance = clock;
}
public static long nanoTime() {
return instance().nanoTime();
}
}
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