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• SimpleLongIdGenerator.java

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se.l4.commons.id.SimpleLongIdGenerator Maven / Gradle / Ivy

package se.l4.commons.id;

import java.util.concurrent.ThreadLocalRandom;

/**
 * {@link LongIdGenerator} that uses the current time and a random number to
 * generate identifiers. The identifiers generated should be good enough
 * to be used on several machines with minimal risk of collission.
 * 
 * @author Andreas Holstenson
 *
 */
public class SimpleLongIdGenerator
	implements LongIdGenerator
{
	/** Start of this generators epoch, 2013-01-01 00:00 GMT */
	public static final long EPOCH_START = 1356998400000l;
	public static final int MAX_RANDOM = -1 ^ (-1 << 22);
	
	public SimpleLongIdGenerator()
	{
	}
	
	@Override
	public long next()
	{
		long time = System.currentTimeMillis() - EPOCH_START;
		long r = ThreadLocalRandom.current().nextLong() >>> 42;
		return (time << 22) | r;
	}
}