| // 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.clock; |
| |
| import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe; |
| |
| /** |
| * 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(); |
| } |
| } |