org.onlab.util.Timer Maven / Gradle / Ivy
/*
* Copyright 2014-present Open Networking Foundation
*
* 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 java.util.concurrent.TimeUnit;
import java.util.function.Supplier;
import com.google.common.base.Suppliers;
import io.netty.util.HashedWheelTimer;
import io.netty.util.Timeout;
import io.netty.util.TimerTask;
/**
* 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 org.jboss.netty.util.HashedWheelTimer timer;
private static final Supplier TIMER =
Suppliers.memoize(HashedWheelTimer::new);
// Ban public construction
private Timer() {
}
/**
* Executes one-shot timer task on shared thread pool.
*
* @param task timer task to execute
* @param delay before executing the task
* @param unit of delay
* @return a handle which is associated with the specified task
*/
public static Timeout newTimeout(TimerTask task, long delay, TimeUnit unit) {
return TIMER.get().newTimeout(task, delay, unit);
}
}