| /* |
| * 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.hbase.regionserver.compactions; |
| |
| import java.util.Calendar; |
| import java.util.GregorianCalendar; |
| |
| import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| @InterfaceAudience.Private |
| public class CurrentHourProvider { |
| private CurrentHourProvider() { throw new AssertionError(); } |
| |
| private static final class Tick { |
| final int currentHour; |
| final long expirationTimeInMillis; |
| |
| Tick(int currentHour, long expirationTimeInMillis) { |
| this.currentHour = currentHour; |
| this.expirationTimeInMillis = expirationTimeInMillis; |
| } |
| } |
| |
| static Tick nextTick() { |
| Calendar calendar = new GregorianCalendar(); |
| calendar.setTimeInMillis(EnvironmentEdgeManager.currentTime()); |
| int currentHour = calendar.get(Calendar.HOUR_OF_DAY); |
| moveToNextHour(calendar); |
| return new Tick(currentHour, calendar.getTimeInMillis()); |
| } |
| |
| private static void moveToNextHour(Calendar calendar) { |
| calendar.add(Calendar.HOUR_OF_DAY, 1); |
| calendar.set(Calendar.MINUTE, 0); |
| calendar.set(Calendar.SECOND, 0); |
| calendar.set(Calendar.MILLISECOND, 0); |
| } |
| |
| static volatile Tick tick = nextTick(); |
| |
| public static int getCurrentHour() { |
| Tick tick = CurrentHourProvider.tick; |
| if (EnvironmentEdgeManager.currentTime() < tick.expirationTimeInMillis) { |
| return tick.currentHour; |
| } |
| |
| CurrentHourProvider.tick = tick = nextTick(); |
| return tick.currentHour; |
| } |
| } |