ManualClockSource.java

/*
 * Aphelion
 * Copyright (c) 2014  Joris van der Wel
 * 
 * This file is part of Aphelion
 * 
 * Aphelion is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, version 3 of the License.
 * 
 * Aphelion 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with Aphelion.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * In addition, the following supplemental terms apply, based on section 7 of
 * the GNU Affero General Public License (version 3):
 * a) Preservation of all legal notices and author attributions
 * b) Prohibition of misrepresentation of the origin of this material, and
 * modified versions are required to be marked in reasonable ways as
 * different from the original version
 * 
 * Linking this library statically or dynamically with other modules is making a
 * combined work based on this library. Thus, the terms and conditions of the
 * GNU Affero General Public License cover the whole combination.
 * 
 * As a special exception, the copyright holders of this library give you 
 * permission to link this library with independent modules to produce an 
 * executable, regardless of the license terms of these independent modules,
 * and to copy and distribute the resulting executable under terms of your 
 * choice, provided that you also meet, for each linked independent module,
 * the terms and conditions of the license of that module. An independent
 * module is a module which is not derived from or based on this library.
 */

package aphelion.shared.event;

import aphelion.shared.swissarmyknife.ThreadSafe;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;



/**
 * A clock source with setters, used in test cases.
 * @author Joris
 */
public class ManualClockSource implements ClockSource
{
        private final long TICK_LENGTH;
        private final AtomicLong value = new AtomicLong();

        public ManualClockSource()
        {
                TICK_LENGTH = 0;
        }

        public ManualClockSource(long TICK_LENGTH)
        {
                this.TICK_LENGTH = TICK_LENGTH;
        }
        
        @ThreadSafe
        @Override
        public long nanoTime()
        {
                return value.get();
        }

        public void set(long value, TimeUnit unit)
        {
                this.value.set(unit.toNanos(value));
        }
        
        public void advance(long value, TimeUnit unit)
        {
                this.value.addAndGet(unit.toNanos(value));
        }
        
        public void advanceTick(int amount)
        {
                this.value.addAndGet(TICK_LENGTH * amount);
        }
        
        public void advanceHalfTick()
        {
                this.value.addAndGet(TICK_LENGTH / 2);
        }
}