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/*
* MentaQueue => http://mentaqueue.soliveirajr.com Copyright (C) 2012 Sergio Oliveira Jr. ([email protected])
*
* This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package org.mentaqueue.wait;
import java.util.concurrent.locks.LockSupport;
/**
* No busy spinning, just yield and sleep. You can configure how many iteration to yield before sleeping. Supporing backing-off
* functionality, in other words, if turned on, the sleeping time will increase by one nanosecond gradually until reset is called.
*
* @author Sergio Oliveira Jr.
*/
public class YieldParkWaitStrategy implements WaitStrategy {
private final static int DEFAULT_YIELD_COUNT = 1000;
private final static boolean DEFAULT_BACK_OFF = false;
private final int yieldCount;
private final boolean parkBackOff;
private int count = 0;
private int sleepTime = 0;
public YieldParkWaitStrategy(final int yieldCount, final boolean parkBackOff) {
this.yieldCount = yieldCount;
this.parkBackOff = parkBackOff;
}
public YieldParkWaitStrategy(final int yieldCount) {
this(yieldCount, DEFAULT_BACK_OFF);
}
public YieldParkWaitStrategy(final boolean parkBackOff) {
this(DEFAULT_YIELD_COUNT, parkBackOff);
}
public YieldParkWaitStrategy() {
this(DEFAULT_YIELD_COUNT, DEFAULT_BACK_OFF);
}
@Override
public final void waitForOtherThread() {
if (count < yieldCount) {
Thread.yield();
count++;
} else {
if (parkBackOff) {
LockSupport.parkNanos(++sleepTime);
} else {
LockSupport.parkNanos(1);
}
}
}
@Override
public final void reset() {
count = 0;
sleepTime = 0;
}
}
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