Thomas Vachuska | 24c849c | 2014-10-27 09:53:05 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
| 3 | * or more contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. The ASF licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
tom | 8bf2e6b | 2014-09-10 20:53:54 -0700 | [diff] [blame] | 19 | package org.onlab.util; |
| 20 | |
| 21 | import org.jboss.netty.util.HashedWheelTimer; |
| 22 | |
| 23 | /** |
| 24 | * Hashed-wheel timer singleton. Care must be taken to shutdown the timer |
| 25 | * only when the VM is ready to exit. |
| 26 | */ |
| 27 | public final class Timer { |
| 28 | |
Yuta HIGUCHI | f9ce497 | 2014-10-04 22:13:47 -0700 | [diff] [blame] | 29 | private static volatile HashedWheelTimer timer; |
tom | 8bf2e6b | 2014-09-10 20:53:54 -0700 | [diff] [blame] | 30 | |
| 31 | // Ban public construction |
| 32 | private Timer() { |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Returns the singleton hashed-wheel timer. |
| 37 | * |
| 38 | * @return hashed-wheel timer |
| 39 | */ |
| 40 | public static HashedWheelTimer getTimer() { |
| 41 | if (Timer.timer == null) { |
Yuta HIGUCHI | f9ce497 | 2014-10-04 22:13:47 -0700 | [diff] [blame] | 42 | initTimer(); |
| 43 | } |
| 44 | return Timer.timer; |
| 45 | } |
| 46 | |
| 47 | private static synchronized void initTimer() { |
| 48 | if (Timer.timer == null) { |
Yuta HIGUCHI | a546afc | 2014-10-06 21:44:48 -0700 | [diff] [blame] | 49 | HashedWheelTimer hwTimer = new HashedWheelTimer(); |
| 50 | hwTimer.start(); |
| 51 | Timer.timer = hwTimer; |
tom | 8bf2e6b | 2014-09-10 20:53:54 -0700 | [diff] [blame] | 52 | } |
tom | 8bf2e6b | 2014-09-10 20:53:54 -0700 | [diff] [blame] | 53 | } |
| 54 | |
| 55 | } |