001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.yarn.util;
019
020import java.util.Calendar;
021import java.util.TimeZone;
022
023import org.apache.hadoop.classification.InterfaceAudience.Public;
024import org.apache.hadoop.classification.InterfaceStability.Evolving;
025
026/**
027 * Implementation of {@link Clock} that gives the current UTC time in
028 * milliseconds.
029 */
030@Public
031@Evolving
032public class UTCClock implements Clock {
033
034  private final TimeZone utcZone = TimeZone.getTimeZone("UTC");
035
036  public long getTime() {
037    return Calendar.getInstance(utcZone).getTimeInMillis();
038  }
039}