UniformRandomBackoff.java

package com.nurkiewicz.asyncretry.backoff;

import java.util.Random;

/**
 * @author Tomasz Nurkiewicz
 * @since 7/16/13, 7:26 PM
 */
public class UniformRandomBackoff extends RandomBackoff {

	/**
	 * Randomly between +/- 100ms
	 */
	public static final long DEFAULT_RANDOM_RANGE_MILLIS = 100;

	private final long range;

	public UniformRandomBackoff(Backoff target) {
		this(target, DEFAULT_RANDOM_RANGE_MILLIS);
	}

	public UniformRandomBackoff(Backoff target, Random random) {
		this(target, DEFAULT_RANDOM_RANGE_MILLIS, random);
	}

	public UniformRandomBackoff(Backoff target, final long range) {
		super(target);
		this.range = range;
	}

	public UniformRandomBackoff(Backoff target, final long range, Random random) {
		super(target, random);
		this.range = range;
	}

	@Override
	long addRandomJitter(long initialDelay) {
		final double uniformRandom = (1 - random().nextDouble() * 2) * range;
		return (long) (initialDelay + uniformRandom);
	}


}