| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * 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 org.onosproject.pim.impl; |
| |
| import org.jboss.netty.util.HashedWheelTimer; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| /** |
| * PIM Timer used for PIM Neighbors. |
| */ |
| public final class PIMTimer { |
| |
| private static volatile HashedWheelTimer timer; |
| |
| // Ban public construction |
| private PIMTimer() { |
| } |
| |
| /** |
| * Returns the singleton hashed-wheel timer. |
| * |
| * @return hashed-wheel timer |
| */ |
| public static HashedWheelTimer getTimer() { |
| if (PIMTimer.timer == null) { |
| initTimer(); |
| } |
| return PIMTimer.timer; |
| } |
| |
| // Start the PIM timer. |
| private static synchronized void initTimer() { |
| if (PIMTimer.timer == null) { |
| |
| // Create and start a new hashed wheel timer, if it does not exist. |
| HashedWheelTimer hwTimer = new HashedWheelTimer(); |
| hwTimer.start(); |
| PIMTimer.timer = hwTimer; |
| } |
| } |
| |
| public static void start() { |
| if (PIMTimer.timer == null) { |
| getTimer(); |
| } |
| checkNotNull(timer); |
| timer.start(); |
| } |
| |
| public static void stop() { |
| if (PIMTimer.timer == null) { |
| // No need to stop |
| return; |
| } |
| checkNotNull(timer); |
| timer.stop(); |
| } |
| } |