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/*
* Copyright 2014 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.onlab.util;
import org.jboss.netty.util.HashedWheelTimer;
/**
* Hashed-wheel timer singleton. Care must be taken to shutdown the timer
* only when the VM is ready to exit.
*/
public final class Timer {
private static volatile HashedWheelTimer timer;
// Ban public construction
private Timer() {
}
/**
* Returns the singleton hashed-wheel timer.
*
* @return hashed-wheel timer
*/
public static HashedWheelTimer getTimer() {
if (Timer.timer == null) {
initTimer();
}
return Timer.timer;
}
private static synchronized void initTimer() {
if (Timer.timer == null) {
HashedWheelTimer hwTimer = new HashedWheelTimer();
hwTimer.start();
Timer.timer = hwTimer;
}
}
}
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