| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.fs.slive; |
| |
| /** |
| * Simple timer class that abstracts time access |
| */ |
| class Timer { |
| |
| // no construction allowed |
| private Timer() { |
| |
| } |
| |
| /** |
| * The current time in milliseconds |
| * |
| * @return long (milliseconds) |
| */ |
| static long now() { |
| return System.currentTimeMillis(); |
| } |
| |
| /** |
| * Calculates how much time in milliseconds elapsed from given start time to |
| * the current time in milliseconds |
| * |
| * @param startTime |
| * @return elapsed time (milliseconds) |
| */ |
| static long elapsed(long startTime) { |
| long elapsedTime = now() - startTime; |
| if (elapsedTime < 0) { |
| elapsedTime = 0; |
| } |
| return elapsedTime; |
| } |
| |
| } |