| // 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 java.time.Instant; |
| |
| /** Provides an interface for a pluggable clock. */ |
| public interface Clock { |
| |
| /** |
| * Returns the current time in milliseconds. The milliseconds are counted from midnight Jan 1, |
| * 1970. |
| */ |
| long currentTimeMillis(); |
| |
| /** |
| * Returns the current time in nanoseconds. The nanoseconds are measured relative to some unknown, |
| * but fixed event. Unfortunately, a sequence of calls to this method is *not* guaranteed to |
| * return non-decreasing values, so callers should be tolerant to this behavior. |
| */ |
| long nanoTime(); |
| |
| /** Returns {@link #currentTimeMillis} as an {@link Instant}. */ |
| default Instant now() { |
| return Instant.ofEpochMilli(currentTimeMillis()); |
| } |
| } |