| // 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; |
| |
| /** |
| * This class 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(); |
| } |